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Kubernetes v1.21.14二进制搭建单节点集群

2023-05-16

1. 集群环境准备

1.1. 主机规划

IP主机名主机角色操作系统安装组件
192.168.11.71k8s-master1master,workerCentos7.9api-server, controller-manager, scheduler, etcd, kubectl, kubelet, kube-proxy, containerd, runc

1.2. 软件版本

软件版本备注
kubernetesv1.21.14
etcdv3.5.4
calicov3.19.4
corendsv1.8.4
containerdv1.6.10
runcv1.1.0
crictlv1.24.2
cniv1.1.1
cfsslv1.6.3

1.3. 网络分配

网络名称网段备注
Node网络192.168.11.0/24
Service网络10.96.0.0/12
Pod网络172.16.0.0/12

2. 集群部署

2.1. 主机准备

UUID也需要修改，每个主机的UUID必须要设置不一致，MAC地址也必须不一样，对于通过虚拟机clone的方式尤其需要注意，他们的UUID, MAC地址极有可能是一样的
分别修改每台主机的IP地址，以及hostname；由于我这里每台主机都是通过VMware克隆出来的，所以其主机IP都是一样的

# 时间同步
yum install -y chrony
systemctl start chronyd
systemctl enable chronyd
chronyc sources

# 关闭防火墙
systemctl disable --now firewalld

# 关闭selinux
setenforce 0
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/sysconfig/selinux
sestatus

# 关闭交换分区
sed -ri 's/.*swap.*/#&/' /etc/fstab
swapoff -a && sysctl -w vm.swappiness=0
cat /etc/fstab

# 时间同步
yum install -y chrony
systemctl start chronyd
systemctl enable chronyd
chronyc sources

# 网络配置
# 方式一
# systemctl disable --now NetworkManager
# systemctl start network && systemctl enable network

# 方式二
cat > /etc/NetworkManager/conf.d/calico.conf << EOF
[keyfile]
unmanaged-devices=interface-name:cali*;interface-name:tunl*
EOF
systemctl restart NetworkManager

# 主机系统优化
ulimit -SHn 65535
cat >> /etc/security/limits.conf <<EOF
* soft nofile 655360
* hard nofile 131072
* soft nproc 655350
* hard nproc 655350
* seft memlock unlimited
* hard memlock unlimitedd
EOF

yum install ipvsadm ipset sysstat conntrack libseccomp -y

tee /etc/modules-load.d/ipvs.conf << 'EOF'
ip_vs
ip_vs_lc
ip_vs_wlc
ip_vs_rr
ip_vs_wrr
ip_vs_lblc
ip_vs_lblcr
ip_vs_dh
ip_vs_sh
ip_vs_fo
ip_vs_nq
ip_vs_sed
ip_vs_ftp
nf_conntrack
ip_tables
ip_set
xt_set
ipt_set
ipt_rpfilter
ipt_REJECT
ipip
EOF

systemctl restart systemd-modules-load.service

# 查看模块是否已经被启用
lsmod | grep -e ip_vs -e nf_conntrack

# 优化内核参数
tee /etc/sysctl.d/k8s.conf << 'EOF'
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 1
fs.may_detach_mounts = 1
vm.overcommit_memory=1
vm.panic_on_oom=0
fs.inotify.max_user_watches=89100
fs.file-max=52706963
fs.nr_open=52706963
net.netfilter.nf_conntrack_max=2310720

net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_keepalive_intvl =15
net.ipv4.tcp_max_tw_buckets = 36000
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_max_orphans = 327680
net.ipv4.tcp_orphan_retries = 3
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.ip_conntrack_max = 65536
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_timestamps = 0
net.core.somaxconn = 16384

net.ipv6.conf.all.disable_ipv6 = 0
net.ipv6.conf.default.disable_ipv6 = 0
net.ipv6.conf.lo.disable_ipv6 = 0
net.ipv6.conf.all.forwarding = 1

EOF

sysctl --system

# 加载containerd相关内核模块
modprobe overlay
modprobe br_netfilter

tee /etc/modules-load.d/containerd.conf << 'EOF'
overlay
br_netfileter
EOF

systemctl enable --now systemd-modules-load.service

# 安装必备工具
yum -y install wget jq psmisc vim net-tools tree telnet yum-utils device-mapper-persistent-data lvm2 git network-scripts tar curl -y

reboot

重启之后需要查看一下ipvs, containerd相关模块加载情况

lsmod | grep --color=auto -e ip_vs -e nf_conntrack

lsmod | egrep 'br_netfilter | overlay'

2.2. 下载etcd, k8s, cfssl软件安装包

  • K8S版本可以参考该目录
    • github参考地址
# 创建工作目录
mkdir -p /data/work
cd /data/work

# 下载cfssl工具
CFSSL_VERSION=1.6.3
#wget -O cfssl_linux-amd64 https://ghproxy.com/https://github.com/cloudflare/cfssl/releases/download/v${CFSSL_VERSION}/cfssl_${CFSSL_VERSION}_linux_amd64
#wget -O cfssljson_linux-amd64 https://ghproxy.com/https://github.com/cloudflare/cfssl/releases/download/v${CFSSL_VERSION}/cfssljson_${CFSSL_VERSION}_linux_amd64
#wget -O cfssl-certinfo_linux-amd64 https://ghproxy.com/https://github.com/cloudflare/cfssl/releases/download/v${CFSSL_VERSION}/cfssl-certinfo_${CFSSL_VERSION}_linux_amd64

chmod +x cfssl*
mv cfssl_linux-amd64 /usr/local/bin/cfssl
mv cfssljson_linux-amd64 /usr/local/bin/cfssljson
mv cfssl-certinfo_linux-amd64 /usr/local/bin/cfssl-certinfo



ETCD_VERSION=v3.5.4
#wget https://ghproxy.com/https://github.com/etcd-io/etcd/releases/download/${ETCD_VERSION}/etcd-${ETCD_VERSION}-linux-amd64.tar.gz
tar -zxvf etcd-${ETCD_VERSION}-linux-amd64.tar.gz
cp -ar etcd-${ETCD_VERSION}-linux-amd64/etcd* /usr/local/bin
chmod +x /usr/local/bin/etcd*
ls -ll /usr/local/bin/etcd*
etcdctl version


K8S_VERSION=v1.21.14
#wget https://storage.googleapis.com/kubernetes-release/release/${K8S_VERSION}/kubernetes-server-linux-amd64.tar.gz
tar zxvf kubernetes-server-linux-amd64.tar.gz
cd  kubernetes/server/bin/

cp kube-apiserver kube-controller-manager kube-scheduler kubectl kubelet kube-proxy /usr/local/bin/

# 退出目录，回到/data/work工作目录中，后续所有的操作依然在本目录中
cd /data/work/

2.3. 生成CA证书

tee ca-csr.json << 'EOF'
{
  "CN": "kubernetes",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "Beijing",
      "L": "Beijing",
      "O": "Kubernetes",
      "OU": "Kubernetes-manual"
    }
  ],
  "ca": {
    "expiry": "876000h"
  }
}
EOF

cfssl gencert -initca ca-csr.json  | cfssljson -bare ca

tee ca-config.json << 'EOF'
{
  "signing": {
    "default": {
      "expiry": "876000h"
    },
    "profiles": {
      "kubernetes": {
        "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ],
        "expiry": "876000h"
      }
    }
  }
}
EOF

mkdir -p /etc/kubernetes/pki
cp ca*.pem /etc/kubernetes/pki/

2.4. 部署ETCD

2.4.1. 启动ETCD

# 创建etcd csr请求文件
tee etcd-csr.json << 'EOF'
{
  "CN": "etcd",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "Beijing",
      "L": "Beijing",
      "O": "Kubernetes",
      "OU": "Kubernetes-manual"
    }
  ]
}
EOF

# 生成etcd相关证书
cfssl gencert \
   -ca=ca.pem \
   -ca-key=ca-key.pem \
   -config=ca-config.json \
   -hostname=127.0.0.1,k8s-master1,192.168.11.71 \
   -profile=kubernetes \
   etcd-csr.json | cfssljson -bare etcd
ls -ll etcd*.pem

# 创建ETCD服务配置文件
tee etcd-config.yml << 'EOF'
name: 'etcd1'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://192.168.11.71:2380'
listen-client-urls: 'https://192.168.11.71:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.11.71:2380'
advertise-client-urls: 'https://192.168.11.71:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'etcd1=https://192.168.11.71:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/ca.pem'
  auto-tls: true
peer-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  peer-client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/ca.pem'
  auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false
EOF

# 创建etcd服务启动文件
tee etcd.service << 'EOF'
[Unit]
Description=Etcd Service
Documentation=https://coreos.com/etcd/docs/latest/
After=network.target

[Service]
Type=notify
ExecStart=/usr/local/bin/etcd --config-file=/etc/etcd/etcd-config.yml
Restart=on-failure
RestartSec=10
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
Alias=etcd3.service
EOF

mkdir -p /etc/etcd/ssl
cp etcd*.pem /etc/etcd/ssl/
cp etcd-config.yml /etc/etcd/
cp etcd.service /usr/lib/systemd/system/

mkdir -p /etc/kubernetes/pki/etcd
ln -s /etc/etcd/ssl/* /etc/kubernetes/pki/etcd/
mkdir -p /var/lib/etcd

# 启动ETCD
systemctl daemon-reload && systemctl enable etcd.service && systemctl start etcd.service

2.4.2. 验证ETCD的状态

# 查看ETCD各节点的健康状态
ETCDCTL_API=3 && /usr/local/bin/etcdctl --write-out=table --cacert=/etc/kubernetes/pki/ca.pem --cert=/etc/kubernetes/pki/etcd/etcd.pem --key=/etc/kubernetes/pki/etcd/etcd-key.pem --endpoints=https://192.168.11.71:2379 endpoint health

# 查看成员列表
ETCDCTL_API=3 && /usr/local/bin/etcdctl --write-out=table --cacert=/etc/kubernetes/pki/ca.pem --cert=/etc/kubernetes/pki/etcd/etcd.pem --key=/etc/kubernetes/pki/etcd/etcd-key.pem --endpoints=https://192.168.11.71:2379 member list

# 查看数据库大小以及哪个节点是Leader节点
ETCDCTL_API=3 && /usr/local/bin/etcdctl --write-out=table --cacert=/etc/kubernetes/pki/ca.pem --cert=/etc/kubernetes/pki/etcd/etcd.pem --key=/etc/kubernetes/pki/etcd/etcd-key.pem --endpoints=https://192.168.11.71:2379 endpoint status

# 检查ETCD的性能
ETCDCTL_API=3 && /usr/local/bin/etcdctl --write-out=table --cacert=/etc/kubernetes/pki/ca.pem --cert=/etc/kubernetes/pki/etcd/etcd.pem --key=/etc/kubernetes/pki/etcd/etcd-key.pem --endpoints=https://192.168.11.71:2379 check perf

执行结果

[root@k8s-master1 work]# # 查看ETCD各节点的健康状态
[root@k8s-master1 work]# ETCDCTL_API=3 && /usr/local/bin/etcdctl --write-out=table --cacert=/etc/kubernetes/pki/ca.pem --cert=/etc/kubernetes/pki/etcd/etcd.pem --key=/etc/kubernetes/pki/etcd/etcd-key.pem --endpoints=https://192.168.11.71:2379 endpoint health
+----------------------------+--------+-------------+-------+
|          ENDPOINT          | HEALTH |    TOOK     | ERROR |
+----------------------------+--------+-------------+-------+
| https://192.168.11.71:2379 |   true | 14.286573ms |       |
+----------------------------+--------+-------------+-------+
[root@k8s-master1 work]#
[root@k8s-master1 work]# # 查看成员列表
[root@k8s-master1 work]# ETCDCTL_API=3 && /usr/local/bin/etcdctl --write-out=table --cacert=/etc/kubernetes/pki/ca.pem --cert=/etc/kubernetes/pki/etcd/etcd.pem --key=/etc/kubernetes/pki/etcd/etcd-key.pem --endpoints=https://192.168.11.71:2379 member list
+------------------+---------+-------+----------------------------+----------------------------+------------+
|        ID        | STATUS  | NAME  |         PEER ADDRS         |        CLIENT ADDRS        | IS LEARNER |
+------------------+---------+-------+----------------------------+----------------------------+------------+
| 5ce02800cf5f635d | started | etcd1 | https://192.168.11.71:2380 | https://192.168.11.71:2379 |      false |
+------------------+---------+-------+----------------------------+----------------------------+------------+
[root@k8s-master1 work]#
[root@k8s-master1 work]# # 查看数据库大小以及哪个节点是Leader节点
[root@k8s-master1 work]# ETCDCTL_API=3 && /usr/local/bin/etcdctl --write-out=table --cacert=/etc/kubernetes/pki/ca.pem --cert=/etc/kubernetes/pki/etcd/etcd.pem --key=/etc/kubernetes/pki/etcd/etcd-key.pem --endpoints=https://192.168.11.71:2379 endpoint status
+----------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
|          ENDPOINT          |        ID        | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |
+----------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| https://192.168.11.71:2379 | 5ce02800cf5f635d |   3.5.4 |   20 kB |      true |      false |         2 |          5 |                  5 |        |
+----------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
[root@k8s-master1 work]#
[root@k8s-master1 work]# # 检查ETCD的性能
[root@k8s-master1 work]# ETCDCTL_API=3 && /usr/local/bin/etcdctl --write-out=table --cacert=/etc/kubernetes/pki/ca.pem --cert=/etc/kubernetes/pki/etcd/etcd.pem --key=/etc/kubernetes/pki/etcd/etcd-key.pem --endpoints=https://192.168.11.71:2379 check perf
 59 / 60 Booooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooom  !  98.33%PASS: Throughput is 150 writes/s
PASS: Slowest request took 0.073586s
PASS: Stddev is 0.002288s
PASS
[root@k8s-master1 work]#

2.5. 部署apiserver

2.5.1. 启动apiserver

tee kube-apiserver-csr.json << 'EOF'
{
  "CN": "kube-apiserver",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "Beijing",
      "L": "Beijing",
      "O": "Kubernetes",
      "OU": "Kubernetes-manual"
    }
  ]
}
EOF

# 生成apiserver证书
cfssl gencert   \
  -ca=ca.pem   \
  -ca-key=ca-key.pem   \
  -config=ca-config.json   \
  -hostname=10.96.0.1,127.0.0.1,kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.default.svc.cluster.local,192.168.11.71  \
  -profile=kubernetes   kube-apiserver-csr.json | cfssljson -bare kube-apiserver

# 这里必须使用cat命令，不能使用tee命令，否者这里的$(head -c 16 /dev/urandom | od -An -t x | tr -d ' ')不会被解析
cat > token.csv << EOF
$(head -c 16 /dev/urandom | od -An -t x | tr -d ' '),kubelet-bootstrap,10001,"system:kubelet-bootstrap"
EOF

# 创建apiserver配置文件
tee kube-apiserver.conf << 'EOF'
tee /etc/kubernetes/kube-apiserver.conf << 'EOF'
KUBE_APISERVER_OPTS="--enable-admission-plugins=NamespaceLifecycle,NodeRestriction,LimitRanger,ServiceAccount,DefaultStorageClass,ResourceQuota,DefaultTolerationSeconds \
  --anonymous-auth=false \
  --bind-address=192.168.11.71 \
  --secure-port=6443 \
  --advertise-address=192.168.11.71 \
  --authorization-mode=Node,RBAC \
  --runtime-config=api/all=true \
  --enable-bootstrap-token-auth=true \
  --service-cluster-ip-range=10.96.0.0/12 \
  --token-auth-file=/etc/kubernetes/token.csv \
  --service-node-port-range=0-50000 \
  --tls-cert-file=/etc/kubernetes/pki/kube-apiserver.pem  \
  --tls-private-key-file=/etc/kubernetes/pki/kube-apiserver-key.pem \
  --client-ca-file=/etc/kubernetes/pki/ca.pem \
  --kubelet-client-certificate=/etc/kubernetes/pki/kube-apiserver.pem \
  --kubelet-client-key=/etc/kubernetes/pki/kube-apiserver-key.pem \
  --service-account-key-file=/etc/kubernetes/pki/ca-key.pem \
  --service-account-signing-key-file=/etc/kubernetes/pki/ca-key.pem  \
  --service-account-issuer=https://kubernetes.default.svc.cluster.local \
  --etcd-cafile=/etc/kubernetes/pki/ca.pem \
  --etcd-certfile=/etc/kubernetes/pki/etcd/etcd.pem \
  --etcd-keyfile=/etc/kubernetes/pki/etcd/etcd-key.pem \
  --etcd-servers=https://192.168.11.71:2379 \
  --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname \
  --allow-privileged=true \
  --apiserver-count=3 \
  --audit-log-maxage=30 \
  --audit-log-maxbackup=3 \
  --audit-log-maxsize=100 \
  --audit-log-path=/var/log/kube-apiserver-audit.log \
  --event-ttl=1h \
  --alsologtostderr=true \
  --logtostderr=false \
  --log-dir=/var/log/kubernetes \
  --v=4"
EOF

# 创建apiserver服务启动文件
tee kube-apiserver.service << 'EOF'
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=etcd.service
Wants=etcd.service

[Service]
EnvironmentFile=-/etc/kubernetes/kube-apiserver.conf
ExecStart=/usr/local/bin/kube-apiserver $KUBE_APISERVER_OPTS
Restart=on-failure
RestartSec=5
Type=notify
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
EOF

# 移动apiserver配置文件到相应位置
cp kube-apiserver*.pem /etc/kubernetes/pki/
cp token.csv /etc/kubernetes/
cp kube-apiserver.conf /etc/kubernetes/
cp kube-apiserver.service /usr/lib/systemd/system/
mkdir -p /etc/kubernetes/manifests/ /etc/systemd/system/kubelet.service.d /var/lib/kubelet /var/log/kubernetes

# 启动服务
systemctl daemon-reload && systemctl enable kube-apiserver && systemctl start kube-apiserver

2.5.2. 校验api-server服务是否正常启动

systemctl status kube-apiserver

curl --insecure https://192.168.11.71:6443/

执行结果

[root@k8s-master1 ~]# systemctl status kube-apiserver
● kube-apiserver.service - Kubernetes API Server
   Loaded: loaded (/usr/lib/systemd/system/kube-apiserver.service; enabled;                                                                                vendor preset: disabled)
   Active: active (running) since Thu 2022-11-17 22:16:20 CST; 1min 25s ago
     Docs: https://github.com/kubernetes/kubernetes
 Main PID: 52956 (kube-apiserver)
   CGroup: /system.slice/kube-apiserver.service
           └─52956 /usr/local/bin/kube-apiserver --enable-admission-plugi...

Nov 17 22:17:22 k8s-master1 kube-apiserver[52956]: I1117 22:17:22.478545 ...
Nov 17 22:17:22 k8s-master1 kube-apiserver[52956]: I1117 22:17:22.484930 ...
Nov 17 22:17:32 k8s-master1 kube-apiserver[52956]: I1117 22:17:32.464028 ...
Nov 17 22:17:32 k8s-master1 kube-apiserver[52956]: I1117 22:17:32.469795 ...
Nov 17 22:17:32 k8s-master1 kube-apiserver[52956]: I1117 22:17:32.481656 ...
Nov 17 22:17:32 k8s-master1 kube-apiserver[52956]: I1117 22:17:32.485503 ...
Nov 17 22:17:42 k8s-master1 kube-apiserver[52956]: I1117 22:17:42.463590 ...
Nov 17 22:17:42 k8s-master1 kube-apiserver[52956]: I1117 22:17:42.467854 ...
Nov 17 22:17:42 k8s-master1 kube-apiserver[52956]: I1117 22:17:42.480078 ...
Nov 17 22:17:42 k8s-master1 kube-apiserver[52956]: I1117 22:17:42.486241 ...
Hint: Some lines were ellipsized, use -l to show in full.
[root@k8s-master1 ~]#
[root@k8s-master1 ~]# curl --insecure https://192.168.11.71:6443/
{
  "kind": "Status",
  "apiVersion": "v1",
  "metadata": {},
  "status": "Failure",
  "message": "Unauthorized",
  "reason": "Unauthorized",
  "code": 401
[root@k8s-master1 ~]#

2.6. 部署kubectl

2.6.1. 创建CSR文件

tee admin-csr.json << 'EOF'
{
  "CN": "admin",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "Beijing",
      "L": "Beijing",
      "O": "system:masters",
      "OU": "Kubernetes-manual"
    }
  ]
}
EOF

# 生成admin证书
cfssl gencert \
    -ca=ca.pem \
    -ca-key=ca-key.pem \
    -config=ca-config.json \
    -profile=kubernetes \
    admin-csr.json | cfssljson -bare admin


kubectl config set-cluster kubernetes --certificate-authority=ca.pem --embed-certs=true --server=https://192.168.11.71:6443 --kubeconfig=kube.config

# 设置客户端认证参数
kubectl config set-credentials admin --client-certificate=admin.pem --client-key=admin-key.pem --embed-certs=true --kubeconfig=kube.config

# 设置上下文参数
kubectl config set-context kubernetes --cluster=kubernetes --user=admin --kubeconfig=kube.config

# 设置当前上下文
kubectl config use-context kubernetes --kubeconfig=kube.config


mkdir -p ~/.kube
cp kube.config ~/.kube/config
cp kube.config /etc/kubernetes/admin.conf

# 授权kubernetes证书访问kubelet api权限
kubectl create clusterrolebinding kube-apiserver:kubelet-apis --clusterrole=system:kubelet-api-admin --user kubernetes --kubeconfig=/root/.kube/config

yum install -y bash-completion
source /usr/share/bash-completion/bash_completion
source <(kubectl completion bash)
kubectl completion bash > ~/.kube/completion.bash.inc
source '/root/.kube/completion.bash.inc'
source $HOME/.bash_profile

2.6.2. 查看集群状态

kubectl cluster-info
kubectl get componentstatuses
kubectl get all --all-namespaces

2.7. 部署kube-controller-manager

2.7.1. 启动kube-controller-manager

tee kube-controller-manager-csr.json << 'EOF'
{
  "CN": "system:kube-controller-manager",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "Beijing",
      "L": "Beijing",
      "O": "system:kube-controller-manager",
      "OU": "Kubernetes-manual"
    }
  ]
}
EOF

# 创建controller-manager证书
cfssl gencert \
   -ca=ca.pem \
   -ca-key=ca-key.pem \
   -hostname=127.0.0.1,192.168.11.71 \
   -config=ca-config.json \
   -profile=kubernetes \
   kube-controller-manager-csr.json | cfssljson -bare kube-controller-manager


# 创建Kube-controller-manager的kubeconfig
kubectl config set-cluster kubernetes \
     --certificate-authority=ca.pem \
     --embed-certs=true \
     --server=https://192.168.11.71:6443 \
     --kubeconfig=kube-controller-manager.kubeconfig

# 设置客户端认证参数
kubectl config set-credentials system:kube-controller-manager \
     --client-certificate=kube-controller-manager.pem \
     --client-key=kube-controller-manager-key.pem \
     --embed-certs=true \
     --kubeconfig=kube-controller-manager.kubeconfig

# 设置上下文参数
kubectl config set-context system:kube-controller-manager@kubernetes \
    --cluster=kubernetes \
    --user=system:kube-controller-manager \
    --kubeconfig=kube-controller-manager.kubeconfig

# 设置当前上下文
kubectl config use-context system:kube-controller-manager@kubernetes \
     --kubeconfig=kube-controller-manager.kubeconfig

# 创建controller-manager配置文件
tee kube-controller-manager.conf << 'EOF'
KUBE_CONTROLLER_MANAGER_OPTS="--secure-port=10257 \
  --bind-address=127.0.0.1 \
  --kubeconfig=/etc/kubernetes/kube-controller-manager.kubeconfig \
  --service-cluster-ip-range=10.96.0.0/12 \
  --cluster-name=kubernetes \
  --cluster-signing-cert-file=/etc/kubernetes/pki/ca.pem \
  --cluster-signing-key-file=/etc/kubernetes/pki/ca-key.pem \
  --allocate-node-cidrs=true \
  --cluster-cidr=172.16.0.0/12 \
  --root-ca-file=/etc/kubernetes/pki/ca.pem \
  --service-account-private-key-file=/etc/kubernetes/pki/ca-key.pem \
  --leader-elect=true \
  --feature-gates=RotateKubeletServerCertificate=true \
  --controllers=*,bootstrapsigner,tokencleaner \
  --horizontal-pod-autoscaler-sync-period=10s \
  --tls-cert-file=/etc/kubernetes/pki/kube-controller-manager.pem \
  --tls-private-key-file=/etc/kubernetes/pki/kube-controller-manager-key.pem \
  --use-service-account-credentials=true \
  --alsologtostderr=true \
  --logtostderr=false \
  --log-dir=/var/log/kubernetes \
  --v=2"
EOF

# 创建服务启动文件
tee kube-controller-manager.service << 'EOF'
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=-/etc/kubernetes/kube-controller-manager.conf
ExecStart=/usr/local/bin/kube-controller-manager $KUBE_CONTROLLER_MANAGER_OPTS
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target
EOF


# 复制配置文件到对应目录
cp kube-controller-manager*.pem /etc/kubernetes/pki/
cp kube-controller-manager.kubeconfig /etc/kubernetes/
cp kube-controller-manager.conf /etc/kubernetes/
cp kube-controller-manager.service /usr/lib/systemd/system/


systemctl daemon-reload  &&systemctl enable kube-controller-manager && systemctl start kube-controller-manager && systemctl status kube-controller-manager

2.7.2. 验证controller-manager服务是否启动成功

kubectl get componentstatuses

2.8. 部署kube-scheduler

2.8.1. 启动kube-scheduler

tee kube-scheduler-csr.json << 'EOF'
{
  "CN": "system:kube-scheduler",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "Beijing",
      "L": "Beijing",
      "O": "system:kube-scheduler",
      "OU": "Kubernetes-manual"
    }
  ]
}
EOF

# 创建证书
cfssl gencert \
   -ca=ca.pem \
   -ca-key=ca-key.pem \
   -hostname=127.0.0.1,192.168.11.71,192.168.11.72,192.168.11.73 \
   -config=ca-config.json \
   -profile=kubernetes \
   kube-scheduler-csr.json | cfssljson -bare kube-scheduler


# 创建kube-scheduler的kubeconfig文件
kubectl config set-cluster kubernetes \
     --certificate-authority=ca.pem \
     --embed-certs=true \
     --server=https://192.168.11.71:6443 \
     --kubeconfig=kube-scheduler.kubeconfig

# 设置客户端认证参数
kubectl config set-credentials system:kube-scheduler \
     --client-certificate=kube-scheduler.pem \
     --client-key=kube-scheduler-key.pem \
     --embed-certs=true \
     --kubeconfig=kube-scheduler.kubeconfig

# 设置上下文参数
kubectl config set-context system:kube-scheduler@kubernetes \
     --cluster=kubernetes \
     --user=system:kube-scheduler \
     --kubeconfig=kube-scheduler.kubeconfig

# 设置当前上下文
kubectl config use-context system:kube-scheduler@kubernetes \
     --kubeconfig=kube-scheduler.kubeconfig


# 创建kube-scheduler的配置文件
tee kube-scheduler.conf << 'EOF'
KUBE_SCHEDULER_OPTS="--bind-address=127.0.0.1 \
  --kubeconfig=/etc/kubernetes/kube-scheduler.kubeconfig \
  --leader-elect=true \
  --alsologtostderr=true \
  --logtostderr=false \
  --log-dir=/var/log/kubernetes \
  --v=2"
EOF


# 创建kube-scheduler服务启动文件
tee kube-scheduler.service << 'EOF'
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=-/etc/kubernetes/kube-scheduler.conf
ExecStart=/usr/local/bin/kube-scheduler $KUBE_SCHEDULER_OPTS
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF


# 拷贝kube-scheduler到合适的集群节点中
cp kube-scheduler*.pem /etc/kubernetes/ssl/
cp kube-scheduler.kubeconfig /etc/kubernetes/
cp kube-scheduler.conf /etc/kubernetes/
cp kube-scheduler.service /usr/lib/systemd/system/


systemctl daemon-reload &&  systemctl enable kube-scheduler && systemctl start kube-scheduler && systemctl status kube-scheduler

2.8.2. 验证scheduler是否启动成功

kubectl get componentstatuses

2.9. 安装containerd

直接在每个节点上执行以下脚本即可

# 下载containerd
#wget https://ghproxy.com/https://github.com/containerd/containerd/releases/download/v1.6.10/cri-containerd-cni-1.6.10-linux-amd64.tar.gz
# 直接把containerd所有的可执行文件解压至根目录
tar -xvzf cri-containerd-cni-*-linux-amd64.tar.gz -C /

# 替换containerd默认自带的runc
#wget https://ghproxy.com/https://github.com/opencontainers/runc/releases/download/v1.1.2/runc.amd64
mv runc.amd64 runc
chmod +x runc
mv -f runc /usr/local/sbin/

#创建服务启动文件
tee /etc/systemd/system/containerd.service << 'EOF'
[Unit]
Description=containerd container runtime
Documentation=https://containerd.io
After=network.target local-fs.target

[Service]
ExecStartPre=-/sbin/modprobe overlay
ExecStart=/usr/local/bin/containerd
Type=notify
Delegate=yes
KillMode=process
Restart=always
RestartSec=5
LimitNPROC=infinity
LimitCORE=infinity
LimitNOFILE=infinity
TasksMax=infinity
OOMScoreAdjust=-999

[Install]
WantedBy=multi-user.target
EOF

# 配置containerd所需要的模块
cat <<EOF | tee /etc/modules-load.d/containerd.conf
overlay
br_netfilter
EOF

# 加载overlay, br_netfilter模块
systemctl restart systemd-modules-load.service

# 配置contaienrd所需要的内核参数
cat <<EOF | tee /etc/sysctl.d/99-kubernetes-cri.conf
net.bridge.bridge-nf-call-iptables  = 1
net.ipv4.ip_forward                 = 1
net.bridge.bridge-nf-call-ip6tables = 1
EOF

# 加载内核参数
sysctl --system

# 创建默认配置文件
mkdir -p /etc/containerd
# 创建containerd默认配置文件
#containerd config default | tee /etc/containerd/config.toml
#sed -i "s#SystemdCgroup = false#SystemdCgroup = true#" /etc/containerd/config.toml
#sed -i "s#registry.k8s.io#registry.aliyuncs.com/google_containers#" /etc/containerd/config.toml

# 直接生成配置文件，注意以下版本，这里生成的是containerd 1.6.10的配置，其它版本的配置应该生成默认的配置，然后进行更改
tee /etc/containerd/config.toml << 'EOF'
disabled_plugins = []
imports = []
oom_score = 0
plugin_dir = ""
required_plugins = []
root = "/var/lib/containerd"
state = "/run/containerd"
temp = ""
version = 2

[cgroup]
  path = ""

[debug]
  address = ""
  format = ""
  gid = 0
  level = ""
  uid = 0

[grpc]
  address = "/run/containerd/containerd.sock"
  gid = 0
  max_recv_message_size = 16777216
  max_send_message_size = 16777216
  tcp_address = ""
  tcp_tls_ca = ""
  tcp_tls_cert = ""
  tcp_tls_key = ""
  uid = 0

[metrics]
  address = ""
  grpc_histogram = false

[plugins]

  [plugins."io.containerd.gc.v1.scheduler"]
    deletion_threshold = 0
    mutation_threshold = 100
    pause_threshold = 0.02
    schedule_delay = "0s"
    startup_delay = "100ms"

  [plugins."io.containerd.grpc.v1.cri"]
    device_ownership_from_security_context = false
    disable_apparmor = false
    disable_cgroup = false
    disable_hugetlb_controller = true
    disable_proc_mount = false
    disable_tcp_service = true
    enable_selinux = false
    enable_tls_streaming = false
    enable_unprivileged_icmp = false
    enable_unprivileged_ports = false
    ignore_image_defined_volumes = false
    max_concurrent_downloads = 3
    max_container_log_line_size = 16384
    netns_mounts_under_state_dir = false
    restrict_oom_score_adj = false
    sandbox_image = "registry.aliyuncs.com/google_containers/pause:3.6"
    selinux_category_range = 1024
    stats_collect_period = 10
    stream_idle_timeout = "4h0m0s"
    stream_server_address = "127.0.0.1"
    stream_server_port = "0"
    systemd_cgroup = false
    tolerate_missing_hugetlb_controller = true
    unset_seccomp_profile = ""

    [plugins."io.containerd.grpc.v1.cri".cni]
      bin_dir = "/opt/cni/bin"
      conf_dir = "/etc/cni/net.d"
      conf_template = ""
      ip_pref = ""
      max_conf_num = 1

    [plugins."io.containerd.grpc.v1.cri".containerd]
      default_runtime_name = "runc"
      disable_snapshot_annotations = true
      discard_unpacked_layers = false
      ignore_rdt_not_enabled_errors = false
      no_pivot = false
      snapshotter = "overlayfs"

      [plugins."io.containerd.grpc.v1.cri".containerd.default_runtime]
        base_runtime_spec = ""
        cni_conf_dir = ""
        cni_max_conf_num = 0
        container_annotations = []
        pod_annotations = []
        privileged_without_host_devices = false
        runtime_engine = ""
        runtime_path = ""
        runtime_root = ""
        runtime_type = ""

        [plugins."io.containerd.grpc.v1.cri".containerd.default_runtime.options]

      [plugins."io.containerd.grpc.v1.cri".containerd.runtimes]

        [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc]
          base_runtime_spec = ""
          cni_conf_dir = ""
          cni_max_conf_num = 0
          container_annotations = []
          pod_annotations = []
          privileged_without_host_devices = false
          runtime_engine = ""
          runtime_path = ""
          runtime_root = ""
          runtime_type = "io.containerd.runc.v2"

          [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc.options]
            BinaryName = ""
            CriuImagePath = ""
            CriuPath = ""
            CriuWorkPath = ""
            IoGid = 0
            IoUid = 0
            NoNewKeyring = false
            NoPivotRoot = false
            Root = ""
            ShimCgroup = ""
            SystemdCgroup = true

      [plugins."io.containerd.grpc.v1.cri".containerd.untrusted_workload_runtime]
        base_runtime_spec = ""
        cni_conf_dir = ""
        cni_max_conf_num = 0
        container_annotations = []
        pod_annotations = []
        privileged_without_host_devices = false
        runtime_engine = ""
        runtime_path = ""
        runtime_root = ""
        runtime_type = ""

        [plugins."io.containerd.grpc.v1.cri".containerd.untrusted_workload_runtime.options]

    [plugins."io.containerd.grpc.v1.cri".image_decryption]
      key_model = "node"

    [plugins."io.containerd.grpc.v1.cri".registry]
      config_path = ""

      [plugins."io.containerd.grpc.v1.cri".registry.auths]

      [plugins."io.containerd.grpc.v1.cri".registry.configs]

      [plugins."io.containerd.grpc.v1.cri".registry.headers]

      [plugins."io.containerd.grpc.v1.cri".registry.mirrors]
        [plugins."io.containerd.grpc.v1.cri".registry.mirrors."docker.io"]
          endpoint = ["https://docker.mirrors.ustc.edu.cn", "http://hub-mirror.c.163.com"]
        [plugins."io.containerd.grpc.v1.cri".registry.mirrors."gcr.io"]
          endpoint = ["https://gcr.mirrors.ustc.edu.cn"]
        [plugins."io.containerd.grpc.v1.cri".registry.mirrors."k8s.gcr.io"]
          endpoint = ["https://gcr.mirrors.ustc.edu.cn/google-containers/"]
        [plugins."io.containerd.grpc.v1.cri".registry.mirrors."quay.io"]
          endpoint = ["https://quay.mirrors.ustc.edu.cn"]

    [plugins."io.containerd.grpc.v1.cri".x509_key_pair_streaming]
      tls_cert_file = ""
      tls_key_file = ""

  [plugins."io.containerd.internal.v1.opt"]
    path = "/opt/containerd"

  [plugins."io.containerd.internal.v1.restart"]
    interval = "10s"

  [plugins."io.containerd.internal.v1.tracing"]
    sampling_ratio = 1.0
    service_name = "containerd"

  [plugins."io.containerd.metadata.v1.bolt"]
    content_sharing_policy = "shared"

  [plugins."io.containerd.monitor.v1.cgroups"]
    no_prometheus = false

  [plugins."io.containerd.runtime.v1.linux"]
    no_shim = false
    runtime = "runc"
    runtime_root = ""
    shim = "containerd-shim"
    shim_debug = false

  [plugins."io.containerd.runtime.v2.task"]
    platforms = ["linux/amd64"]
    sched_core = false

  [plugins."io.containerd.service.v1.diff-service"]
    default = ["walking"]

  [plugins."io.containerd.service.v1.tasks-service"]
    rdt_config_file = ""

  [plugins."io.containerd.snapshotter.v1.aufs"]
    root_path = ""

  [plugins."io.containerd.snapshotter.v1.btrfs"]
    root_path = ""

  [plugins."io.containerd.snapshotter.v1.devmapper"]
    async_remove = false
    base_image_size = ""
    discard_blocks = false
    fs_options = ""
    fs_type = ""
    pool_name = ""
    root_path = ""

  [plugins."io.containerd.snapshotter.v1.native"]
    root_path = ""

  [plugins."io.containerd.snapshotter.v1.overlayfs"]
    root_path = ""
    upperdir_label = false

  [plugins."io.containerd.snapshotter.v1.zfs"]
    root_path = ""

  [plugins."io.containerd.tracing.processor.v1.otlp"]
    endpoint = ""
    insecure = false
    protocol = ""

[proxy_plugins]

[stream_processors]

  [stream_processors."io.containerd.ocicrypt.decoder.v1.tar"]
    accepts = ["application/vnd.oci.image.layer.v1.tar+encrypted"]
    args = ["--decryption-keys-path", "/etc/containerd/ocicrypt/keys"]
    env = ["OCICRYPT_KEYPROVIDER_CONFIG=/etc/containerd/ocicrypt/ocicrypt_keyprovider.conf"]
    path = "ctd-decoder"
    returns = "application/vnd.oci.image.layer.v1.tar"

  [stream_processors."io.containerd.ocicrypt.decoder.v1.tar.gzip"]
    accepts = ["application/vnd.oci.image.layer.v1.tar+gzip+encrypted"]
    args = ["--decryption-keys-path", "/etc/containerd/ocicrypt/keys"]
    env = ["OCICRYPT_KEYPROVIDER_CONFIG=/etc/containerd/ocicrypt/ocicrypt_keyprovider.conf"]
    path = "ctd-decoder"
    returns = "application/vnd.oci.image.layer.v1.tar+gzip"

[timeouts]
  "io.containerd.timeout.bolt.open" = "0s"
  "io.containerd.timeout.shim.cleanup" = "5s"
  "io.containerd.timeout.shim.load" = "5s"
  "io.containerd.timeout.shim.shutdown" = "3s"
  "io.containerd.timeout.task.state" = "2s"

[ttrpc]
  address = ""
  gid = 0
  uid = 0
EOF



systemctl daemon-reload
systemctl enable --now containerd
systemctl restart  containerd

# 验证containerd是否安装成功
crictl info

# 验证是否可以下载镜像
ctr images pull docker.io/library/redis:alpine

2.10. 部署kubelet

2.10.1. 启动kubelet

BOOTSTRAP_TOKEN=$(awk -F "," '{print $1}' /etc/kubernetes/token.csv)

kubectl config set-cluster kubernetes \
  --certificate-authority=ca.pem \
  --embed-certs=true \
  --server=https://192.168.11.71:6443 \
  --kubeconfig=kubelet-bootstrap.kubeconfig

kubectl config set-credentials kubelet-bootstrap \
  --token=${BOOTSTRAP_TOKEN} \
  --kubeconfig=kubelet-bootstrap.kubeconfig

kubectl config set-context default \
  --cluster=kubernetes \
  --user=kubelet-bootstrap \
  --kubeconfig=kubelet-bootstrap.kubeconfig

kubectl config use-context default \
  --kubeconfig=kubelet-bootstrap.kubeconfig

kubectl create clusterrolebinding cluster-system-anonymous \
  --clusterrole=cluster-admin \
  --user=kubelet-bootstrap

kubectl create clusterrolebinding kubelet-bootstrap \
  --clusterrole=system:node-bootstrapper \
  --user=kubelet-bootstrap

kubectl describe clusterrolebinding cluster-system-anonymous
kubectl describe clusterrolebinding kubelet-bootstrap

# 创建kubelet配置文件
tee kubelet.json << 'EOF'
{
  "kind": "KubeletConfiguration",
  "apiVersion": "kubelet.config.k8s.io/v1beta1",
  "authentication": {
    "x509": {
      "clientCAFile": "/etc/kubernetes/pki/ca.pem"
    },
    "webhook": {
      "enabled": true,
      "cacheTTL": "2m0s"
    },
    "anonymous": {
      "enabled": false
    }
  },
  "authorization": {
    "mode": "Webhook",
    "webhook": {
      "cacheAuthorizedTTL": "5m0s",
      "cacheUnauthorizedTTL": "30s"
    }
  },
  "address": "192.168.11.71",
  "port": 10250,
  "readOnlyPort": 10255,
  "cgroupDriver": "systemd",
  "hairpinMode": "promiscuous-bridge",
  "serializeImagePulls": false,
  "featureGates": {
    "RotateKubeletServerCertificate": true
  },
  "clusterDomain": "cluster.local.",
  "clusterDNS": ["10.96.0.10"]
}
EOF

# 创建kubelet服务启动配置文件
tee kubelet.service << 'EOF'
[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/kubernetes/kubernetes
After=containerd.service
Requires=containerd.service

[Service]
WorkingDirectory=/var/lib/kubelet
ExecStart=/usr/local/bin/kubelet \
  --bootstrap-kubeconfig=/etc/kubernetes/kubelet-bootstrap.kubeconfig \
  --cert-dir=/etc/kubernetes/pki \
  --kubeconfig=/etc/kubernetes/kubelet.kubeconfig \
  --config=/etc/kubernetes/kubelet.json \
  --cni-bin-dir=/etc/cni/bin \
  --cni-conf-dir=/etc/cni/net.d \
  --container-runtime=remote \
  --container-runtime-endpoint=unix:///run/containerd/containerd.sock \
  --network-plugin=cni \
  --rotate-certificates \
  --pod-infra-container-image=registry.aliyuncs.com/google_containers/pause:3.2 \
  --root-dir=/etc/cni/net.d \
  --alsologtostderr=true \
  --logtostderr=false \
  --log-dir=/var/log/kubernetes \
  --v=2
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF


mkdir -p /etc/kubernetes/pki
mkdir -p /etc/kubernetes/manifests/ /etc/systemd/system/kubelet.service.d /var/lib/kubelet /var/log/kubernetes
cp kubelet-bootstrap.kubeconfig /etc/kubernetes/
cp kubelet.json /etc/kubernetes/
cp kubelet.service /usr/lib/systemd/system/


systemctl daemon-reload && systemctl enable kubelet &&  systemctl start kubelet && systemctl status kubelet

2.10.2. 验证kubelet是否启动成功

kubectl get nodes -owide
kubectl get csr

执行结果，注意kubelet的启动需要一定时间，等个一两分钟再执行此命令如果还不是该结果，那么多半是配置哪里出问题了

[root@k8s-master1 work]#
[root@k8s-master1 work]# kubectl get nodes -owide
NAME          STATUS   ROLES    AGE   VERSION    INTERNAL-IP     EXTERNAL-IP   OS-IMAGE                KERNEL-VERSION              CONTAINER-RUNTIME
k8s-master1   Ready    <none>   53s   v1.21.14   192.168.11.71   <none>        CentOS Linux 7 (Core)   6.0.7-1.el7.elrepo.x86_64   containerd://1.6.10
[root@k8s-master1 work]# kubectl get csr
NAME        AGE     SIGNERNAME                                    REQUESTOR           CONDITION
csr-z56vc   2m12s   kubernetes.io/kube-apiserver-client-kubelet   kubelet-bootstrap   Approved,Issued
[root@k8s-master1 work]#
[root@k8s-master1 work]#

2.11. 部署kubeproxy

tee kube-proxy-csr.json << 'EOF'
{
  "CN": "system:kube-proxy",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "Beijing",
      "L": "Beijing",
      "O": "system:kube-proxy",
      "OU": "Kubernetes-manual"
    }
  ]
}
EOF


cfssl gencert \
   -ca=ca.pem \
   -ca-key=ca-key.pem \
   -config=ca-config.json \
   -profile=kubernetes \
   kube-proxy-csr.json | cfssljson -bare kube-proxy


kubectl config set-cluster kubernetes     \
  --certificate-authority=ca.pem     \
  --embed-certs=true     \
  --server=https://192.168.11.71:6443     \
  --kubeconfig=kube-proxy.kubeconfig

kubectl config set-credentials kube-proxy  \
  --client-certificate=kube-proxy.pem     \
  --client-key=kube-proxy-key.pem     \
  --embed-certs=true     \
  --kubeconfig=kube-proxy.kubeconfig

kubectl config set-context default  \
  --cluster=kubernetes     \
  --user=kube-proxy     \
  --kubeconfig=kube-proxy.kubeconfig

kubectl config use-context default \
  --kubeconfig=kube-proxy.kubeconfig


tee kube-proxy.yaml << 'EOF'
apiVersion: kubeproxy.config.k8s.io/v1alpha1
bindAddress: 192.168.11.71
clientConnection:
  kubeconfig: /etc/kubernetes/kube-proxy.kubeconfig
clusterCIDR: 172.16.0.0/12
healthzBindAddress: 192.168.11.71:10256
kind: KubeProxyConfiguration
metricsBindAddress: 192.168.11.71:10249
mode: "ipvs"
EOF


tee kube-proxy.service << 'EOF'
[Unit]
Description=Kubernetes Kube-Proxy Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
WorkingDirectory=/var/lib/kube-proxy
ExecStart=/usr/local/bin/kube-proxy \
  --config=/etc/kubernetes/kube-proxy.yaml \
  --alsologtostderr=true \
  --logtostderr=false \
  --log-dir=/var/log/kubernetes \
  --v=2
Restart=on-failure
RestartSec=5
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
EOF

mkdir -p /var/lib/kube-proxy
cp kube-proxy*.pem /etc/kubernetes/pki/
cp kube-proxy.kubeconfig kube-proxy.yaml /etc/kubernetes/
cp kube-proxy.service /usr/lib/systemd/system/


systemctl daemon-reload && systemctl enable kube-proxy && systemctl restart kube-proxy && systemctl status kube-proxy

2.12. 部署网络组件calico

网友反映说 centos7 要升级libseccomp 不然 无法安装calico

wget https://docs.projectcalico.org/v3.19/manifests/calico.yaml

sed -i 's/# - name: CALICO_IPV4POOL_CIDR/- name: CALICO_IPV4POOL_CIDR/g' calico.yaml
sed -i 's/#   value: "192.168.0.0\/16"/  value: "172.16.0.0\/12"/g' calico.yaml
sed -i 's/"type": "calico-ipam"/"type": "calico-ipam",\n              "assign_ipv4": "true"/g' calico.yaml

#创建calico组件
kubectl apply -f calico.yaml

#查看calico pod是否成功创建
kubectl get pods -n kube-system -owide

执行过程

[root@k8s-master1 work]#
[root@k8s-master1 work]#
[root@k8s-master1 work]# kubectl apply -f calico.yaml
configmap/calico-config created
customresourcedefinition.apiextensions.k8s.io/bgpconfigurations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/bgppeers.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/blockaffinities.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/clusterinformations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/felixconfigurations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/globalnetworkpolicies.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/globalnetworksets.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/hostendpoints.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipamblocks.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipamconfigs.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipamhandles.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ippools.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/kubecontrollersconfigurations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/networkpolicies.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/networksets.crd.projectcalico.org created
clusterrole.rbac.authorization.k8s.io/calico-kube-controllers created
clusterrolebinding.rbac.authorization.k8s.io/calico-kube-controllers created
clusterrole.rbac.authorization.k8s.io/calico-node created
clusterrolebinding.rbac.authorization.k8s.io/calico-node created
daemonset.apps/calico-node created
serviceaccount/calico-node created
deployment.apps/calico-kube-controllers created
serviceaccount/calico-kube-controllers created
Warning: policy/v1beta1 PodDisruptionBudget is deprecated in v1.21+, unavailable in v1.25+; use policy/v1 PodDisruptionBudget
poddisruptionbudget.policy/calico-kube-controllers created
[root@k8s-master1 work]#
[root@k8s-master1 work]#
[root@k8s-master1 work]#
[root@k8s-master1 work]#
[root@k8s-master1 work]#
[root@k8s-master1 work]#
[root@k8s-master1 work]# kubectl get pods -n kube-system -owide
NAME                                       READY   STATUS    RESTARTS   AGE     IP              NODE        NOMINATED NODE   READINESS GATES
calico-kube-controllers-7cc8dd57d9-dpcqw   1/1     Running   0          3m16s   10.88.0.2       k8s-node1   <none>           <none>
calico-node-hr9f5                          1/1     Running   0          3m15s   192.168.11.74   k8s-node1   <none>           <none>
[root@k8s-master1 work]#

2.13. 部署CoreDNS

tee coredns.yaml  << 'EOF'
apiVersion: v1
kind: ServiceAccount
metadata:
  name: coredns
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
  name: system:coredns
rules:
  - apiGroups:
    - ""
    resources:
    - endpoints
    - services
    - pods
    - namespaces
    verbs:
    - list
    - watch
  - apiGroups:
    - discovery.k8s.io
    resources:
    - endpointslices
    verbs:
    - list
    - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
  name: system:coredns
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:coredns
subjects:
- kind: ServiceAccount
  name: coredns
  namespace: kube-system
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: coredns
  namespace: kube-system
data:
  Corefile: |
    .:53 {
        errors
        health {
          lameduck 5s
        }
        ready
        kubernetes cluster.local in-addr.arpa ip6.arpa {
          fallthrough in-addr.arpa ip6.arpa
        }
        prometheus :9153
        forward . /etc/resolv.conf {
          max_concurrent 1000
        }
        cache 30
        loop
        reload
        loadbalance
    }
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: coredns
  namespace: kube-system
  labels:
    k8s-app: kube-dns
    kubernetes.io/name: "CoreDNS"
spec:
  # replicas: not specified here:
  # 1. Default is 1.
  # 2. Will be tuned in real time if DNS horizontal auto-scaling is turned on.
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 1
  selector:
    matchLabels:
      k8s-app: kube-dns
  template:
    metadata:
      labels:
        k8s-app: kube-dns
    spec:
      priorityClassName: system-cluster-critical
      serviceAccountName: coredns
      tolerations:
        - key: "CriticalAddonsOnly"
          operator: "Exists"
      nodeSelector:
        kubernetes.io/os: linux
      affinity:
         podAntiAffinity:
           preferredDuringSchedulingIgnoredDuringExecution:
           - weight: 100
             podAffinityTerm:
               labelSelector:
                 matchExpressions:
                   - key: k8s-app
                     operator: In
                     values: ["kube-dns"]
               topologyKey: kubernetes.io/hostname
      containers:
      - name: coredns
        image: registry.cn-beijing.aliyuncs.com/dotbalo/coredns:1.8.6 
        imagePullPolicy: IfNotPresent
        resources:
          limits:
            memory: 170Mi
          requests:
            cpu: 100m
            memory: 70Mi
        args: [ "-conf", "/etc/coredns/Corefile" ]
        volumeMounts:
        - name: config-volume
          mountPath: /etc/coredns
          readOnly: true
        ports:
        - containerPort: 53
          name: dns
          protocol: UDP
        - containerPort: 53
          name: dns-tcp
          protocol: TCP
        - containerPort: 9153
          name: metrics
          protocol: TCP
        securityContext:
          allowPrivilegeEscalation: false
          capabilities:
            add:
            - NET_BIND_SERVICE
            drop:
            - all
          readOnlyRootFilesystem: true
        livenessProbe:
          httpGet:
            path: /health
            port: 8080
            scheme: HTTP
          initialDelaySeconds: 60
          timeoutSeconds: 5
          successThreshold: 1
          failureThreshold: 5
        readinessProbe:
          httpGet:
            path: /ready
            port: 8181
            scheme: HTTP
      dnsPolicy: Default
      volumes:
        - name: config-volume
          configMap:
            name: coredns
            items:
            - key: Corefile
              path: Corefile
---
apiVersion: v1
kind: Service
metadata:
  name: kube-dns
  namespace: kube-system
  annotations:
    prometheus.io/port: "9153"
    prometheus.io/scrape: "true"
  labels:
    k8s-app: kube-dns
    kubernetes.io/cluster-service: "true"
    kubernetes.io/name: "CoreDNS"
spec:
  selector:
    k8s-app: kube-dns
  clusterIP: 10.96.0.10 
  ports:
  - name: dns
    port: 53
    protocol: UDP
  - name: dns-tcp
    port: 53
    protocol: TCP
  - name: metrics
    port: 9153
    protocol: TCP
EOF

kubectl apply -f coredns.yaml

2.14. 安装Metric Server

tee metrics-server.yaml << 'EOF'
apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    k8s-app: metrics-server
    rbac.authorization.k8s.io/aggregate-to-admin: "true"
    rbac.authorization.k8s.io/aggregate-to-edit: "true"
    rbac.authorization.k8s.io/aggregate-to-view: "true"
  name: system:aggregated-metrics-reader
rules:
- apiGroups:
  - metrics.k8s.io
  resources:
  - pods
  - nodes
  verbs:
  - get
  - list
  - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    k8s-app: metrics-server
  name: system:metrics-server
rules:
- apiGroups:
  - ""
  resources:
  - pods
  - nodes
  - nodes/stats
  - namespaces
  - configmaps
  verbs:
  - get
  - list
  - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server-auth-reader
  namespace: kube-system
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: extension-apiserver-authentication-reader
subjects:
- kind: ServiceAccount
  name: metrics-server
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server:system:auth-delegator
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:auth-delegator
subjects:
- kind: ServiceAccount
  name: metrics-server
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  labels:
    k8s-app: metrics-server
  name: system:metrics-server
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:metrics-server
subjects:
- kind: ServiceAccount
  name: metrics-server
  namespace: kube-system
---
apiVersion: v1
kind: Service
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server
  namespace: kube-system
spec:
  ports:
  - name: https
    port: 443
    protocol: TCP
    targetPort: https
  selector:
    k8s-app: metrics-server
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server
  namespace: kube-system
spec:
  selector:
    matchLabels:
      k8s-app: metrics-server
  strategy:
    rollingUpdate:
      maxUnavailable: 0
  template:
    metadata:
      labels:
        k8s-app: metrics-server
    spec:
      containers:
      - args:
        - --cert-dir=/tmp
        - --secure-port=4443
        - --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
        - --kubelet-use-node-status-port
        - --metric-resolution=15s
        - --kubelet-insecure-tls
        - --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem # change to front-proxy-ca.crt for kubeadm
        - --requestheader-username-headers=X-Remote-User
        - --requestheader-group-headers=X-Remote-Group
        - --requestheader-extra-headers-prefix=X-Remote-Extra-
        image: registry.cn-beijing.aliyuncs.com/dotbalo/metrics-server:0.5.0
        imagePullPolicy: IfNotPresent
        livenessProbe:
          failureThreshold: 3
          httpGet:
            path: /livez
            port: https
            scheme: HTTPS
          periodSeconds: 10
        name: metrics-server
        ports:
        - containerPort: 4443
          name: https
          protocol: TCP
        readinessProbe:
          failureThreshold: 3
          httpGet:
            path: /readyz
            port: https
            scheme: HTTPS
          initialDelaySeconds: 20
          periodSeconds: 10
        resources:
          requests:
            cpu: 100m
            memory: 200Mi
        securityContext:
          readOnlyRootFilesystem: true
          runAsNonRoot: true
          runAsUser: 1000
        volumeMounts:
        - mountPath: /tmp
          name: tmp-dir
        - name: ca-ssl
          mountPath: /etc/kubernetes/pki
      nodeSelector:
        kubernetes.io/os: linux
      priorityClassName: system-cluster-critical
      serviceAccountName: metrics-server
      volumes:
      - emptyDir: {}
        name: tmp-dir
      - name: ca-ssl
        hostPath:
          path: /etc/kubernetes/pki

---
apiVersion: apiregistration.k8s.io/v1
kind: APIService
metadata:
  labels:
    k8s-app: metrics-server
  name: v1beta1.metrics.k8s.io
spec:
  group: metrics.k8s.io
  groupPriorityMinimum: 100
  insecureSkipTLSVerify: true
  service:
    name: metrics-server
    namespace: kube-system
  version: v1beta1
  versionPriority: 100
EOF

kubectl  apply -f metrics-server.yaml

2.15. 集群验证

tee pod.yaml << 'EOF'
apiVersion: v1
kind: Pod
metadata:
  name: busybox
  namespace: default
spec:
  containers:
  - name: busybox
    image: docker.io/library/busybox:1.28
    command:
      - sleep
      - "3600"
    imagePullPolicy: IfNotPresent
  restartPolicy: Always
EOF

kubectl apply -f pod.yaml

# 查看
kubectl  get pod
#NAME      READY   STATUS    RESTARTS   AGE
#busybox   1/1     Running   0          17s

2.16. 用pod解析默认命名空间中的kubernetes

kubectl get svc
#NAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE
#kubernetes   ClusterIP   10.96.0.1    <none>        443/TCP   17h

kubectl exec  busybox -n default -- nslookup kubernetes
#3Server:    10.96.0.10
#Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local

#Name:      kubernetes
#Address 1: 10.96.0.1 kubernetes.default.svc.cluster.local

2.16.1. 测试跨命名空间是否可以解析

kubectl exec  busybox -n default -- nslookup kube-dns.kube-system
#Server:    10.96.0.10
#Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local

#Name:      kube-dns.kube-system
#Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local

2.16.2. 每个节点都必须要能访问Kubernetes的kubernetes svc 443和kube-dns的service 53

telnet 10.96.0.1 443
Trying 10.96.0.1...
Connected to 10.96.0.1.
Escape character is '^]'.

 telnet 10.96.0.10 53
Trying 10.96.0.10...
Connected to 10.96.0.10.
Escape character is '^]'.

curl 10.96.0.10:53
curl: (52) Empty reply from server

2.16.3. Pod和Pod之前要能通

kubectl get po -owide
NAME      READY   STATUS    RESTARTS   AGE   IP              NODE         NOMINATED NODE   READINESS GATES
busybox   1/1     Running   0          17m   172.27.14.193   k8s-node02   <none>           <none>

 kubectl get po -n kube-system -owide
NAME                                       READY   STATUS    RESTARTS      AGE   IP               NODE           NOMINATED NODE   READINESS GATES
calico-kube-controllers-5dffd5886b-4blh6   1/1     Running   0             77m   172.25.244.193   k8s-master01   <none>           <none>
calico-node-fvbdq                          1/1     Running   1 (75m ago)   77m   192.168.1.61     k8s-master01   <none>           <none>
calico-node-g8nqd                          1/1     Running   0             77m   192.168.1.64     k8s-node01     <none>           <none>
calico-node-mdps8                          1/1     Running   0             77m   192.168.1.65     k8s-node02     <none>           <none>
calico-node-nf4nt                          1/1     Running   0             77m   192.168.1.63     k8s-master03   <none>           <none>
calico-node-sq2ml                          1/1     Running   0             77m   192.168.1.62     k8s-master02   <none>           <none>
calico-typha-8445487f56-mg6p8              1/1     Running   0             77m   192.168.1.65     k8s-node02     <none>           <none>
calico-typha-8445487f56-pxbpj              1/1     Running   0             77m   192.168.1.61     k8s-master01   <none>           <none>
calico-typha-8445487f56-tnssl              1/1     Running   0             77m   192.168.1.64     k8s-node01     <none>           <none>
coredns-5db5696c7-67h79                    1/1     Running   0             63m   172.25.92.65     k8s-master02   <none>           <none>
metrics-server-6bf7dcd649-5fhrw            1/1     Running   0             61m   172.18.195.1     k8s-master03   <none>           <none>

# 进入busybox ping其他节点上的pod

kubectl exec -ti busybox -- sh
/ # ping 192.168.1.64
PING 192.168.1.64 (192.168.1.64): 56 data bytes
64 bytes from 192.168.1.64: seq=0 ttl=63 time=0.358 ms
64 bytes from 192.168.1.64: seq=1 ttl=63 time=0.668 ms
64 bytes from 192.168.1.64: seq=2 ttl=63 time=0.637 ms
64 bytes from 192.168.1.64: seq=3 ttl=63 time=0.624 ms
64 bytes from 192.168.1.64: seq=4 ttl=63 time=0.907 ms

# 可以连通证明这个pod是可以跨命名空间和跨主机通信的

2.16.4. 创建三个副本，可以看到3个副本分布在不同的节点

cat > deployments.yaml << EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: docker.io/library/nginx:1.14.2
        ports:
        - containerPort: 80

EOF

kubectl  apply -f deployments.yaml 
deployment.apps/nginx-deployment created

kubectl  get pod 
NAME                               READY   STATUS    RESTARTS   AGE
busybox                            1/1     Running   0          6m25s
nginx-deployment-9456bbbf9-4bmvk   1/1     Running   0          8s
nginx-deployment-9456bbbf9-9rcdk   1/1     Running   0          8s
nginx-deployment-9456bbbf9-dqv8s   1/1     Running   0          8s

# 删除nginx

kubectl delete -f deployments.yaml
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二进制搭建单节点集群

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