1.资源规划
| | | | |
|---|
| 名称 | 系统 | 配置 | IP | 组件 |
| k8s-master01 | CentOS 7.9 | 4核8G 500G存储 | 172.16.97.27 | kube-apiserver <br>kube-controller-manager <br>kube-scheduler <br>etcd |
| k8s-master02 | CentOS 7.9 | 4核8G 500G存储 | 172.16.97.28 | kube-apiserver <br>kube-controller-manager <br>kube-scheduler <br>etcd |
| k8s-master03 | CentOS 7.9 | 4核8G 500G存储 | 172.16.97.29 | kube-apiserver <br>kube-controller-manager <br>kube-scheduler <br>etcd |
| k8s-node01 | CentOS 7.9 | 8核16G 500G存储 | 172.16.97.30 | kubelet <br>kube-proxy <br>docker |
| k8s-node02 | CentOS 7.9 | 8核16G 500G存储 | 172.16.97.31 | kubelet <br>kube-proxy <br>docker |
| k8s-node03 | CentOS 7.9 | 8核16G 500G存储 | 172.16.97.32 | kubelet <br>kube-proxy <br>docker |
| HA01 | CentOS 7.9 | 4核8G 60G存储 | 172.16.97.33 <br>172.16.97.35(vip) | haproxy、keepalived |
| HA02 | CentOS 7.9 | 4核8G 60G存储 | 172.16.97.34 | haproxy、keepalived |
2.系统初始化
1.主机名设置
# hostnamectl set-hostname xxx
2.主机与IP地址解析
cat >> /etc/hosts << EOF
172.16.97.33 ha1
172.16.97.34 ha2
172.16.97.27 k8s-master01
172.16.97.28 k8s-master02
172.16.97.29 k8s-master03
172.16.97.30 k8s-node01
172.16.97.31 k8s-node02
172.16.97.32 k8s-node03
EOF
3.关闭防火墙，生产环境不建议关闭防火墙
# systemctl stop firewalld
# systemctl disable firewalld
4.关闭selinx
# sed -ri 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
# sestatus
5.关闭wasp
# sed -ri 's/.*swap.*/#&/' /etc/fstab
# sysctl -p
# free -m 确认是否关闭
6.同步时间
# yum -y install ntpdate
# ntpdate ntp1.aliyun.com
7.主机系统优化
cat <<EOF >> /etc/security/limits.conf
* soft nofile 655360
* hard nofile 131072
* soft nproc 655350
* hard nproc 655350
* soft memlock unlimited
* hard memlock unlimited
EOF
- 升级操作系统内核
所有主机均需要操作。
导入elrepo gpg key
# rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
安装elrepo YUM源仓库
# yum -y install https://www.elrepo.org/elrepo-release-7.0-4.el7.elrepo.noarch.rpm
安装kernel-ml版本，ml为长期稳定版本，lt为长期维护版本
# yum --enablerepo="elrepo-kernel" -y install kernel-ml.x86_64
设置grub2默认引导为0
# grub2-set-default 0
重新生成grub2引导文件
# grub2-mkconfig -o /boot/grub2/grub.cfg
更新后，需要重启，使用升级的内核生效。
# reboot
重启后，需要验证内核是否为更新对应的版本
# uname -r
9.Linux内核优化
cat <<EOF > /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 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 = 131072
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_timestamps = 0
net.core.somaxconn = 16384
EOF
sysctl --system
10.ipvs管理工具安装及模块加载
为集群节点安装，负载均衡节点不用安装
# yum -y install ipvsadm ipset sysstat conntrack libseccomp
所有节点配置ipvs模块，在内核4.19+版本nf_conntrack_ipv4已经改为nf_conntrack， 4.18以下使用nf_conntrack_ipv4即可：
创建 /etc/modules-load.d/ipvs.conf 并加入以下内容：
cat >/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
ip_vs_sh
nf_conntrack
ip_tables
ip_set
xt_set
ipt_set
ipt_rpfilter
ipt_REJECT
ipip
EOF
设置为开机启动
# systemctl enable --now systemd-modules-load.service
所有节点配置完内核后，重启服务器，保证重启后内核依旧加载
# reboot -h now
重启后查看ipvs模块加载情况：
# lsmod | grep --color=auto -e ip_vs -e nf_conntrack
11.依赖安装（负载均衡节点不安装）
# yum install wget jq psmisc vim net-tools telnet yum-utils device-mapper-persistent-data lvm2 git lrzsz -y
3.etcd集群搭建
在k8s-master01上操作。
1.创建工作目录
# mkdir -p /data/k8s-work
2.获取cfssl工具
# cd /data/k8s-work
# wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
# wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
# wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_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
# cfssl version
3.创建CA证书
3.1.配置ca证书请求文件
cat > ca-csr.json <<"EOF"
{
"CN": "kubernetes",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "beijing",
"L": "beijing",
"O": "kubemsb",
"OU": "CN"
}
],
"ca": {
"expiry": "87600h"
}
}
EOF
3.2.创建ca证书
# cfssl gencert -initca ca-csr.json | cfssljson -bare ca
3.3.配置ca证书策略
# cfssl print-defaults config > ca-config.json
cat > ca-config.json <<"EOF"
{
"signing": {
"default": {
"expiry": "87600h"
},
"profiles": {
"kubernetes": {
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
],
"expiry": "87600h"
}
}
}
}
EOF
4. 创建etcd证书
4.1.配置etcd请求文件
cat > etcd-csr.json <<"EOF"
{
"CN": "etcd",
"hosts": [
"127.0.0.1",
"172.16.97.27",
"172.16.97.28",
"172.16.97.29"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "kubemsb",
"OU": "CN"
}]
}
EOF
4.2.生成etcd证书
# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes etcd-csr.json | cfssljson -bare etcd
5.部署etcd集群
5.1.下载etcd软件包
# wget https://github.com/etcd-io/etcd/releases/download/v3.5.2/etcd-v3.5.2-linux-amd64.tar.gz
5.2.安装etcd软件
# tar -xvf etcd-v3.5.2-linux-amd64.tar.gz
# cp -p etcd-v3.5.2-linux-amd64/etcd* /usr/local/bin/
5.3.分发etcd软件
# scp etcd-v3.5.2-linux-amd64/etcd* k8s-master02:/usr/local/bin/
# scp etcd-v3.5.2-linux-amd64/etcd* k8s-master03:/usr/local/bin/
5.4.创建配置文件
# mkdir /etc/etcd
k8s-master01：
cat > /etc/etcd/etcd.conf <<"EOF"
#[Member]
ETCD_NAME="etcd01"
ETCD_DATA_DIR="/data/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://172.16.97.27:2380"
ETCD_LISTEN_CLIENT_URLS="https://172.16.97.27:2379,http://127.0.0.1:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://172.16.97.27:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://172.16.97.27:2379"
ETCD_INITIAL_CLUSTER="etcd01=https://172.16.97.27:2380,etcd02=https://172.16.97.28:2380,etcd03=https://172.16.97.29:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF
k8s-master02：
cat > /etc/etcd/etcd.conf <<"EOF"
#[Member]
ETCD_NAME="etcd02"
ETCD_DATA_DIR="/data/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://172.16.97.28:2380"
ETCD_LISTEN_CLIENT_URLS="https://172.16.97.28:2379,http://127.0.0.1:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://172.16.97.28:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://172.16.97.28:2379"
ETCD_INITIAL_CLUSTER="etcd01=https://172.16.97.27:2380,etcd02=https://172.16.97.28:2380,etcd03=https://172.16.97.29:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF
k8s-master03：
cat > /etc/etcd/etcd.conf <<"EOF"
#[Member]
ETCD_NAME="etcd03"
ETCD_DATA_DIR="/data/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://172.16.97.29:2380"
ETCD_LISTEN_CLIENT_URLS="https://172.16.97.29:2379,http://127.0.0.1:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://172.16.97.29:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://172.16.97.29:2379"
ETCD_INITIAL_CLUSTER="etcd01=https://172.16.97.27:2380,etcd02=https://172.16.97.28:2380,etcd03=https://172.16.97.29:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF
说明：
ETCD_NAME：节点名称，集群中唯一
ETCD_DATA_DIR：数据目录
ETCD_LISTEN_PEER_URLS：集群通信监听地址
ETCD_LISTEN_CLIENT_URLS：客户端访问监听地址
ETCD_INITIAL_ADVERTISE_PEER_URLS：集群通告地址
ETCD_ADVERTISE_CLIENT_URLS：客户端通告地址
ETCD_INITIAL_CLUSTER：集群节点地址
ETCD_INITIAL_CLUSTER_TOKEN：集群Token
ETCD_INITIAL_CLUSTER_STATE：加入集群的当前状态，new是新集群，existing表示加入已有集群
5.5.创建服务配置文件
# mkdir -p /etc/etcd/ssl
# mkdir -p /data/etcd/default.etcd
cat > /etc/systemd/system/etcd.service <<"EOF"
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
[Service]
Type=notify
EnvironmentFile=-/etc/etcd/etcd.conf
WorkingDirectory=/data/etcd/
ExecStart=/usr/local/bin/etcd \
--cert-file=/etc/etcd/ssl/etcd.pem \
--key-file=/etc/etcd/ssl/etcd-key.pem \
--trusted-ca-file=/etc/etcd/ssl/ca.pem \
--peer-cert-file=/etc/etcd/ssl/etcd.pem \
--peer-key-file=/etc/etcd/ssl/etcd-key.pem \
--peer-trusted-ca-file=/etc/etcd/ssl/ca.pem \
--peer-client-cert-auth \
--client-cert-auth
Restart=on-failure
RestartSec=5
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
5.6.复制证书
# cd /data/k8s-work
# cp ca*.pem /etc/etcd/ssl
# cp etcd*.pem /etc/etcd/ssl
复制证书到其他节点
# scp ca*.pem k8s-master02:/etc/etcd/ssl
# scp etcd*.pem k8s-master02:/etc/etcd/ssl
# scp ca*.pem k8s-master03:/etc/etcd/ssl
# scp etcd*.pem k8s-master03:/etc/etcd/ssl
5.7.防火墙开放业务端口
# firewall-cmd --zone=public --add-port=2379/tcp --permanent
# firewall-cmd --zone=public --add-port=2380/tcp --permanent
# firewall-cmd --reload
5.8.启动服务
# systemctl daemon-reload
# systemctl enable --now etcd.service
# systemctl status etcd
5.9.验证集群状态
# ETCDCTL_API=3 /usr/local/bin/etcdctl --write-out=table --cacert=/etc/etcd/ssl/ca.pem --cert=/etc/etcd/ssl/etcd.pem --key=/etc/etcd/ssl/etcd-key.pem --endpoints=https://172.16.97.27:2379,https://172.16.97.28:2379,https://172.16.97.29:2379 endpoint health
+---------------------------+--------+-------------+-------+
| ENDPOINT | HEALTH | TOOK | ERROR |
+---------------------------+--------+-------------+-------+
| https://172.16.97.28:2379 | true | 9.861551ms | |
| https://172.16.97.29:2379 | true | 10.005855ms | |
| https://172.16.97.27:2379 | true | 9.862473ms | |
+---------------------------+--------+-------------+-------+
5.10.检查ETCD数据库性能
ETCDCTL_API=3 /usr/local/bin/etcdctl --write-out=table --cacert=/etc/etcd/ssl/ca.pem --cert=/etc/etcd/ssl/etcd.pem --key=/etc/etcd/ssl/etcd-key.pem --endpoints=https://172.16.97.27:2379,https://172.16.97.28:2379,https://172.16.97.29:2379 check perf
6.97.28:2379,https://172.16.97.29:2379 check perf
60 / 60 Boooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo! 100.00% 1m0s
FAIL: Throughput too low: 135 writes/s
Slowest request took too long: 1.343881s
Stddev too high: 0.216175s
FAIL
ETCDCTL_API=3 /usr/local/bin/etcdctl --write-out=table --cacert=/etc/etcd/ssl/ca.pem --cert=/etc/etcd/ssl/etcd.pem --key=/etc/etcd/ssl/etcd-key.pem --endpoints=https://172.16.97.27:2379,https://172.16.97.28:2379,https://172.16.97.29:2379 member list
+------------------+---------+--------+---------------------------+---------------------------+------------+
| ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS | IS LEARNER |
+------------------+---------+--------+---------------------------+---------------------------+------------+
| 1d14b4a34337c008 | started | etcd01 | https://172.16.97.27:2380 | https://172.16.97.27:2379 | false |
| 37f80dd321cdc13b | started | etcd03 | https://172.16.97.29:2380 | https://172.16.97.29:2379 | false |
| 81b9a58e266d509f | started | etcd02 | https://172.16.97.28:2380 | https://172.16.97.28:2379 | false |
+------------------+---------+--------+---------------------------+---------------------------+------------+
ETCDCTL_API=3 /usr/local/bin/etcdctl --write-out=table --cacert=/etc/etcd/ssl/ca.pem --cert=/etc/etcd/ssl/etcd.pem --key=/etc/etcd/ssl/etcd-key.pem --endpoints=https://172.16.97.27:2379,https://172.16.97.28:2379,https://172.16.97.29:2379 endpoint status
+---------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |
+---------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| https://172.16.97.27:2379 | 1d14b4a34337c008 | 3.5.2 | 20 MB | false | false | 4 | 8138 | 8138 | |
| https://172.16.97.28:2379 | 81b9a58e266d509f | 3.5.2 | 20 MB | true | false | 4 | 8138 | 8138 | |
| https://172.16.97.29:2379 | 37f80dd321cdc13b | 3.5.2 | 20 MB | false | false | 4 | 8138 | 8138 | |
+---------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
4.Kubernetes集群部署
1.Kubernetes软件包下载
# wget https://dl.k8s.io/v1.21.10/kubernetes-server-linux-amd64.tar.gz
2.Kubernetes软件包安装
# tar -xvf kubernetes-server-linux-amd64.tar.gz
# cd kubernetes/server/bin/
# cp kube-apiserver kube-controller-manager kube-scheduler kubectl /usr/local/bin/
3.Kubernetes软件分发
# scp kube-apiserver kube-controller-manager kube-scheduler kubectl k8s-master02:/usr/local/bin/
# scp kube-apiserver kube-controller-manager kube-scheduler kubectl k8s-master03:/usr/local/bin/
# scp kubelet kube-proxy k8s-master01:/usr/local/bin
# scp kubelet kube-proxy k8s-master02:/usr/local/bin
# scp kubelet kube-proxy k8s-master03:/usr/local/bin
# scp kubelet kube-proxy k8s-node01:/usr/local/bin
# scp kubelet kube-proxy k8s-node02:/usr/local/bin
# scp kubelet kube-proxy k8s-node03:/usr/local/bin
4.在集群节点上创建目录
mkdir -p /etc/kubernetes/
mkdir -p /etc/kubernetes/ssl
mkdir -p /data/kubernetes
5.部署api-server
5.1 创建apiserver证书请求文件
cat > kube-apiserver-csr.json << "EOF"
{
"CN": "kubernetes",
"hosts": [
"127.0.0.1",
"172.16.97.27",
"172.16.97.28",
"172.16.97.29",
"172.16.97.30",
"172.16.97.31",
"172.16.97.32",
"172.16.97.33",
"172.16.97.34",
"172.16.97.35",
"172.16.97.36",
"172.16.97.37",
"172.16.97.38",
"172.16.97.39",
"172.16.97.40",
"10.96.0.1",
"kubernetes",
"kubernetes.default",
"kubernetes.default.svc",
"kubernetes.default.svc.cluster",
"kubernetes.default.svc.cluster.local"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "kubemsb",
"OU": "CN"
}
]
}
EOF
说明：
如果 hosts 字段不为空则需要指定授权使用该证书的 IP（含VIP） 或域名列表。由于该证书被 集群使用，需要将节点的IP都填上，为了方便后期扩容可以多写几个预留的IP。
同时还需要填写 service 网络的首个IP(一般是 kube-apiserver 指定的 service-cluster-ip-range 网段的第一个IP，如 10.96.0.1)。
5.2 生成apiserver证书及token文件
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-apiserver-csr.json | cfssljson -bare kube-apiserver
cat > token.csv << EOF
$(head -c 16 /dev/urandom | od -An -t x | tr -d ' '),kubelet-bootstrap,10001,"system:kubelet-bootstrap"
EOF
说明：
创建TLS机制所需TOKEN
TLS Bootstraping：Master apiserver启用TLS认证后，Node节点kubelet和kube-proxy与kube-apiserver进行通信，必须使用CA签发的有效证书才可以，当Node节点很多时，这种客户端证书颁发需要大量工作，同样也会增加集群扩展复杂度。为了简化流程，Kubernetes引入了TLS bootstraping机制来自动颁发客户端证书，kubelet会以一个低权限用户自动向apiserver申请证书，kubelet的证书由apiserver动态签署。所以强烈建议在Node上使用这种方式，目前主要用于kubelet，kube-proxy还是由我们统一颁发一个证书。
5.3 创建apiserver服务配置文件
节点1：
cat > /etc/kubernetes/kube-apiserver.conf << "EOF"
KUBE_APISERVER_OPTS="--enable-admission-plugins=NamespaceLifecycle,NodeRestriction,LimitRanger,ServiceAccount,DefaultStorageClass,ResourceQuota \
--anonymous-auth=false \
--bind-address=172.16.97.27 \
--secure-port=6443 \
--advertise-address=172.16.97.27 \
--insecure-port=0 \
--authorization-mode=Node,RBAC \
--runtime-config=api/all=true \
--enable-bootstrap-token-auth \
--service-cluster-ip-range=10.96.0.0/16 \
--token-auth-file=/etc/kubernetes/token.csv \
--service-node-port-range=30000-32767 \
--tls-cert-file=/etc/kubernetes/ssl/kube-apiserver.pem \
--tls-private-key-file=/etc/kubernetes/ssl/kube-apiserver-key.pem \
--client-ca-file=/etc/kubernetes/ssl/ca.pem \
--kubelet-client-certificate=/etc/kubernetes/ssl/kube-apiserver.pem \
--kubelet-client-key=/etc/kubernetes/ssl/kube-apiserver-key.pem \
--service-account-key-file=/etc/kubernetes/ssl/ca-key.pem \
--service-account-signing-key-file=/etc/kubernetes/ssl/ca-key.pem \
--service-account-issuer=api \
--etcd-cafile=/etc/etcd/ssl/ca.pem \
--etcd-certfile=/etc/etcd/ssl/etcd.pem \
--etcd-keyfile=/etc/etcd/ssl/etcd-key.pem \
--etcd-servers=https://172.16.97.27:2379,https://172.16.97.28:2379,https://172.16.97.29:2379 \
--enable-swagger-ui=true \
--allow-privileged=true \
--apiserver-count=3 \
--audit-log-maxage=30 \
--audit-log-maxbackup=3 \
--audit-log-maxsize=100 \
--audit-log-path=/data/kubernetes/kube-apiserver-audit.log \
--event-ttl=1h \
--alsologtostderr=true \
--logtostderr=false \
--log-dir=/data/kubernetes/ \
--v=4"
EOF
节点2：
cat > /etc/kubernetes/kube-apiserver.conf << "EOF"
KUBE_APISERVER_OPTS="--enable-admission-plugins=NamespaceLifecycle,NodeRestriction,LimitRanger,ServiceAccount,DefaultStorageClass,ResourceQuota \
--anonymous-auth=false \
--bind-address=172.16.97.28 \
--secure-port=6443 \
--advertise-address=172.16.97.28 \
--insecure-port=0 \
--authorization-mode=Node,RBAC \
--runtime-config=api/all=true \
--enable-bootstrap-token-auth \
--service-cluster-ip-range=10.96.0.0/16 \
--token-auth-file=/etc/kubernetes/token.csv \
--service-node-port-range=30000-32767 \
--tls-cert-file=/etc/kubernetes/ssl/kube-apiserver.pem \
--tls-private-key-file=/etc/kubernetes/ssl/kube-apiserver-key.pem \
--client-ca-file=/etc/kubernetes/ssl/ca.pem \
--kubelet-client-certificate=/etc/kubernetes/ssl/kube-apiserver.pem \
--kubelet-client-key=/etc/kubernetes/ssl/kube-apiserver-key.pem \
--service-account-key-file=/etc/kubernetes/ssl/ca-key.pem \
--service-account-signing-key-file=/etc/kubernetes/ssl/ca-key.pem \
--service-account-issuer=api \
--etcd-cafile=/etc/etcd/ssl/ca.pem \
--etcd-certfile=/etc/etcd/ssl/etcd.pem \
--etcd-keyfile=/etc/etcd/ssl/etcd-key.pem \
--etcd-servers=https://172.16.97.27:2379,https://172.16.97.28:2379,https://172.16.97.29:2379 \
--enable-swagger-ui=true \
--allow-privileged=true \
--apiserver-count=3 \
--audit-log-maxage=30 \
--audit-log-maxbackup=3 \
--audit-log-maxsize=100 \
--audit-log-path=/data/kubernetes/kube-apiserver-audit.log \
--event-ttl=1h \
--alsologtostderr=true \
--logtostderr=false \
--log-dir=/data/kubernetes/ \
--v=4"
EOF
节点3：
cat > /etc/kubernetes/kube-apiserver.conf << "EOF"
KUBE_APISERVER_OPTS="--enable-admission-plugins=NamespaceLifecycle,NodeRestriction,LimitRanger,ServiceAccount,DefaultStorageClass,ResourceQuota \
--anonymous-auth=false \
--bind-address=172.16.97.29 \
--secure-port=6443 \
--advertise-address=172.16.97.29 \
--insecure-port=0 \
--authorization-mode=Node,RBAC \
--runtime-config=api/all=true \
--enable-bootstrap-token-auth \
--service-cluster-ip-range=10.96.0.0/16 \
--token-auth-file=/etc/kubernetes/token.csv \
--service-node-port-range=30000-32767 \
--tls-cert-file=/etc/kubernetes/ssl/kube-apiserver.pem \
--tls-private-key-file=/etc/kubernetes/ssl/kube-apiserver-key.pem \
--client-ca-file=/etc/kubernetes/ssl/ca.pem \
--kubelet-client-certificate=/etc/kubernetes/ssl/kube-apiserver.pem \
--kubelet-client-key=/etc/kubernetes/ssl/kube-apiserver-key.pem \
--service-account-key-file=/etc/kubernetes/ssl/ca-key.pem \
--service-account-signing-key-file=/etc/kubernetes/ssl/ca-key.pem \
--service-account-issuer=api \
--etcd-cafile=/etc/etcd/ssl/ca.pem \
--etcd-certfile=/etc/etcd/ssl/etcd.pem \
--etcd-keyfile=/etc/etcd/ssl/etcd-key.pem \
--etcd-servers=https://172.16.97.27:2379,https://172.16.97.28:2379,https://172.16.97.29:2379 \
--enable-swagger-ui=true \
--allow-privileged=true \
--apiserver-count=3 \
--audit-log-maxage=30 \
--audit-log-maxbackup=3 \
--audit-log-maxsize=100 \
--audit-log-path=/data/kubernetes/kube-apiserver-audit.log \
--event-ttl=1h \
--alsologtostderr=true \
--logtostderr=false \
--log-dir=/data/kubernetes/ \
--v=4"
EOF
5.4 创建apiserver服务管理配置文件
所有节点配置
cat > /etc/systemd/system/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
5.5 同步文件到集群master节点
cp ca*.pem /etc/kubernetes/ssl/
cp kube-apiserver*.pem /etc/kubernetes/ssl/
cp token.csv /etc/kubernetes/
scp /etc/kubernetes/token.csv k8s-master02:/etc/kubernetes
scp /etc/kubernetes/token.csv k8s-master03:/etc/kubernetes
scp /etc/kubernetes/ssl/kube-apiserver*.pem k8s-master02:/etc/kubernetes/ssl
scp /etc/kubernetes/ssl/kube-apiserver*.pem k8s-master03:/etc/kubernetes/ssl
scp /etc/kubernetes/ssl/ca*.pem k8s-master02:/etc/kubernetes/ssl
scp /etc/kubernetes/ssl/ca*.pem k8s-master03:/etc/kubernetes/ssl
5.6 启动apiserver服务
systemctl daemon-reload
systemctl enable --now kube-apiserver
systemctl status kube-apiserver
# 测试
curl --insecure https://172.16.97.27:6443/
curl --insecure https://172.16.97.28:6443/
curl --insecure https://172.16.97.29:6443/
curl --insecure https://172.16.97.35:6443/
5.7防火墙开启服务端口
firewall-cmd --zone=public --add-port=6443/tcp --permanent
firewall-cmd --reload
6.部署kubectl
6.1 创建kubectl证书请求文件
cat > admin-csr.json << "EOF"
{
"CN": "admin",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:masters",
"OU": "system"
}
]
}
EOF
说明：
后续 kube-apiserver 使用 RBAC 对客户端(如 kubelet、kube-proxy、Pod)请求进行授权；
kube-apiserver 预定义了一些 RBAC 使用的 RoleBindings，如 cluster-admin 将 Group system:masters 与 Role cluster-admin 绑定，该 Role 授予了调用kube-apiserver 的所有 API的权限；
O指定该证书的 Group 为 system:masters，kubelet 使用该证书访问 kube-apiserver 时 ，由于证书被 CA 签名，所以认证通过，同时由于证书用户组为经过预授权的 system:masters，所以被授予访问所有 API 的权限；
注：
这个admin 证书，是将来生成管理员用的kubeconfig 配置文件用的，现在我们一般建议使用RBAC 来对kubernetes 进行角色权限控制， kubernetes 将证书中的CN 字段 作为User， O 字段作为 Group；
"O": "system:masters", 必须是system:masters，否则后面kubectl create clusterrolebinding报错。
6.2 生成证书文件
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin
6.3 复制文件到指定目录
cp admin*.pem /etc/kubernetes/ssl/
6.4 生成kubeconfig配置文件
kube.config 为 kubectl 的配置文件，包含访问 apiserver 的所有信息，如 apiserver 地址、CA 证书和自身使用的证书
kubectl config set-cluster kubernetes --certificate-authority=ca.pem --embed-certs=true --server=https://172.16.97.35:6443 --kubeconfig=kube.config
kubectl config set-credentials admin --client-certificate=admin.pem --client-key=admin-key.pem --embed-certs=true --kubeconfig=kube.config
kubectl config set-context kubernetes --cluster=kubernetes --user=admin --kubeconfig=kube.config
kubectl config use-context kubernetes --kubeconfig=kube.config
6.5 准备kubectl配置文件并进行角色绑定
mkdir ~/.kube
cp kube.config ~/.kube/config
kubectl create clusterrolebinding kube-apiserver:kubelet-apis --clusterrole=system:kubelet-api-admin --user kubernetes --kubeconfig=/root/.kube/config
6.6 查看集群状态
export KUBECONFIG=$HOME/.kube/config
查看集群信息
kubectl cluster-info
Kubernetes control plane is running at https://172.16.97.35:6443
To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
查看集群组件状态
kubectl get componentstatuses
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME STATUS MESSAGE ERROR
controller-manager Unhealthy Get "http://127.0.0.1:10252/healthz": dial tcp 127.0.0.1:10252: connect: connection refused
scheduler Unhealthy Get "http://127.0.0.1:10251/healthz": dial tcp 127.0.0.1:10251: connect: connection refused
etcd-1 Healthy {"health":"true","reason":""}
etcd-0 Healthy {"health":"true","reason":""}
etcd-2 Healthy {"health":"true","reason":""}
查看命名空间中资源对象
kubectl get all --all-namespaces
6.7 同步kubectl配置文件到集群其它master节点
k8s-master02:
mkdir /root/.kube
k8s-master03:
mkdir /root/.kube
scp /root/.kube/config k8s-master02:/root/.kube/config
scp /root/.kube/config k8s-master03:/root/.kube/config
6.8 配置kubectl命令补全(可选)
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
7.部署kube-controller-manager
7.1 创建kube-controller-manager证书请求文件
cat > kube-controller-manager-csr.json << "EOF"
{
"CN": "system:kube-controller-manager",
"key": {
"algo": "rsa",
"size": 2048
},
"hosts": [
"127.0.0.1",
"172.16.97.27",
"172.16.97.28",
"172.16.97.29"
],
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:kube-controller-manager",
"OU": "system"
}
]
}
EOF
说明：
hosts 列表包含所有 kube-controller-manager 节点 IP；
CN 为 system:kube-controller-manager;
O 为 system:kube-controller-manager，kubernetes 内置的 ClusterRoleBindings system:kube-controller-manager 赋予 kube-controller-manager 工作所需的权限
7.2 创建kube-controller-manager证书文件
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-controller-manager-csr.json | cfssljson -bare kube-controller-manager
7.3 创建kube-controller-manager的kube-controller-manager.kubeconfig
kubectl config set-cluster kubernetes --certificate-authority=ca.pem --embed-certs=true --server=https://172.16.97.35:6443 --kubeconfig=kube-controller-manager.kubeconfig
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
kubectl config set-context system:kube-controller-manager --cluster=kubernetes --user=system:kube-controller-manager --kubeconfig=kube-controller-manager.kubeconfig
kubectl config use-context system:kube-controller-manager --kubeconfig=kube-controller-manager.kubeconfig
7.4 创建kube-controller-manager配置文件
cat > kube-controller-manager.conf << "EOF"
KUBE_CONTROLLER_MANAGER_OPTS="--port=10252 \
--secure-port=10257 \
--bind-address=127.0.0.1 \
--kubeconfig=/etc/kubernetes/kube-controller-manager.kubeconfig \
--service-cluster-ip-range=10.96.0.0/16 \
--cluster-name=kubernetes \
--cluster-signing-cert-file=/etc/kubernetes/ssl/ca.pem \
--cluster-signing-key-file=/etc/kubernetes/ssl/ca-key.pem \
--allocate-node-cidrs=true \
--cluster-cidr=10.244.0.0/16 \
--experimental-cluster-signing-duration=87600h \
--root-ca-file=/etc/kubernetes/ssl/ca.pem \
--service-account-private-key-file=/etc/kubernetes/ssl/ca-key.pem \
--leader-elect=true \
--feature-gates=RotateKubeletServerCertificate=true \
--controllers=*,bootstrapsigner,tokencleaner \
--horizontal-pod-autoscaler-use-rest-clients=true \
--horizontal-pod-autoscaler-sync-period=10s \
--tls-cert-file=/etc/kubernetes/ssl/kube-controller-manager.pem \
--tls-private-key-file=/etc/kubernetes/ssl/kube-controller-manager-key.pem \
--use-service-account-credentials=true \
--alsologtostderr=true \
--logtostderr=false \
--log-dir=/data/kubernetes \
--v=2"
EOF
7.5 创建服务启动文件
cat > 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
7.6 同步文件到集群master节点
cp kube-controller-manager*.pem /etc/kubernetes/ssl/
cp kube-controller-manager.kubeconfig /etc/kubernetes/
cp kube-controller-manager.conf /etc/kubernetes/
cp kube-controller-manager.service /usr/lib/systemd/system/
scp kube-controller-manager*.pem k8s-master02:/etc/kubernetes/ssl/
scp kube-controller-manager*.pem k8s-master03:/etc/kubernetes/ssl/
scp kube-controller-manager.kubeconfig kube-controller-manager.conf k8s-master02:/etc/kubernetes/
scp kube-controller-manager.kubeconfig kube-controller-manager.conf k8s-master03:/etc/kubernetes/
scp kube-controller-manager.service k8s-master02:/usr/lib/systemd/system/
scp kube-controller-manager.service k8s-master03:/usr/lib/systemd/system/
#查看证书
openssl x509 -in /etc/kubernetes/ssl/kube-controller-manager.pem -noout -text
7.7 启动服务
systemctl daemon-reload
systemctl enable --now kube-controller-manager
systemctl status kube-controller-manager
kubectl get componentstatuses
7.8防火墙打开服务器端口
firewall-cmd --zone=public --add-port=10257/tcp --permanent
firewall-cmd --zone=public --add-port=10252/tcp --permanent
firewall-cmd --reload
8 部署kube-scheduler
8.1 创建kube-scheduler证书请求文件
cat > kube-scheduler-csr.json << "EOF"
{
"CN": "system:kube-scheduler",
"hosts": [
"127.0.0.1",
"172.16.97.27",
"172.16.97.28",
"172.16.97.29"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:kube-scheduler",
"OU": "system"
}
]
}
EOF
8.2 生成kube-scheduler证书
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-scheduler-csr.json | cfssljson -bare kube-scheduler
8.3 创建kube-scheduler的kubeconfig
kubectl config set-cluster kubernetes --certificate-authority=ca.pem --embed-certs=true --server=https://172.16.97.35:6443 --kubeconfig=kube-scheduler.kubeconfig
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
kubectl config set-context system:kube-scheduler --cluster=kubernetes --user=system:kube-scheduler --kubeconfig=kube-scheduler.kubeconfig
kubectl config use-context system:kube-scheduler --kubeconfig=kube-scheduler.kubeconfig
8.4 创建服务配置文件
cat > kube-scheduler.conf << "EOF"
KUBE_SCHEDULER_OPTS="--address=127.0.0.1 \
--kubeconfig=/etc/kubernetes/kube-scheduler.kubeconfig \
--leader-elect=true \
--alsologtostderr=true \
--logtostderr=false \
--log-dir=/data/kubernetes \
--v=2"
EOF
8.5创建服务启动配置文件
cat > 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 $KUBE_SCHEDULER_OPTS
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target
EOF
8.6 同步文件至集群master节点
cp kube-scheduler*.pem /etc/kubernetes/ssl/
cp kube-scheduler.kubeconfig /etc/kubernetes/
cp kube-scheduler.conf /etc/kubernetes/
cp kube-scheduler.service /usr/lib/systemd/system/
scp kube-scheduler*.pem k8s-master02:/etc/kubernetes/ssl/
scp kube-scheduler*.pem k8s-master03:/etc/kubernetes/ssl/
scp kube-scheduler.kubeconfig kube-scheduler.conf k8s-master02:/etc/kubernetes/
scp kube-scheduler.kubeconfig kube-scheduler.conf k8s-master03:/etc/kubernetes/
scp kube-scheduler.service k8s-master02:/usr/lib/systemd/system/
scp kube-scheduler.service k8s-master03:/usr/lib/systemd/system/
8.7 启动服务
systemctl daemon-reload
systemctl enable --now kube-scheduler
systemctl status kube-scheduler
8.8防火墙开放服务端口
firewall-cmd --zone=public --add-port=10251/tcp --permanent
firewall-cmd --zone=public --add-port=10259/tcp --permanent
firewall-cmd --reload
9.部署docker
1.使用阿里云开源软件镜像站
wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo
2.查看可安装版本
yum list docker-ce.x86_64 --showduplicates | sort -r
3.安装指定版本
yum -y install --setopt=obsoletes=0 docker-ce-20.10.9-3.el7
4.设置启动及开机自启动
systemctl enable docker ; systemctl start docker
5.修改cgroup方式
在/etc/docker/daemon.json添加如下内容
cat /etc/docker/daemon.json
{
"exec-opts": ["native.cgroupdriver=systemd"]
}
6.重启docker
systemctl restart docker
10.部署kubelet
10.1创建kubelet-bootstrap.kubeconfig
在k8s-master1上操作
BOOTSTRAP_TOKEN=$(awk -F "," '{print $1}' /etc/kubernetes/token.csv)
kubectl config set-cluster kubernetes --certificate-authority=ca.pem --embed-certs=true --server=https://172.16.97.35:6443 --kubeconfig=kubelet-bootstrap.kubeconfig
kubectl config set-credentials kubelet-bootstrap --token=${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 --kubeconfig=kubelet-bootstrap.kubeconfig
验证：
kubectl describe clusterrolebinding cluster-system-anonymous
kubectl describe clusterrolebinding kubelet-bootstrap
10.2 创建kubelet配置文件
cat > kubelet.json << "EOF"
{
"kind": "KubeletConfiguration",
"apiVersion": "kubelet.config.k8s.io/v1beta1",
"authentication": {
"x509": {
"clientCAFile": "/etc/kubernetes/ssl/ca.pem"
},
"webhook": {
"enabled": true,
"cacheTTL": "2m0s"
},
"anonymous": {
"enabled": false
}
},
"authorization": {
"mode": "Webhook",
"webhook": {
"cacheAuthorizedTTL": "5m0s",
"cacheUnauthorizedTTL": "30s"
}
},
"address": "172.16.97.30",
"port": 10250,
"readOnlyPort": 10255,
"cgroupDriver": "systemd",
"hairpinMode": "promiscuous-bridge",
"serializeImagePulls": false,
"clusterDomain": "cluster.local.",
"clusterDNS": ["10.96.0.2"]
}
EOF
10.3 创建kubelet服务启动管理文件
cat > kubelet.service << "EOF"
[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/kubernetes/kubernetes
After=docker.service
Requires=docker.service
[Service]
WorkingDirectory=/data/kubelet
ExecStart=/usr/local/bin/kubelet \
--bootstrap-kubeconfig=/etc/kubernetes/kubelet-bootstrap.kubeconfig \
--cert-dir=/etc/kubernetes/ssl \
--kubeconfig=/etc/kubernetes/kubelet.kubeconfig \
--config=/etc/kubernetes/kubelet.json \
--network-plugin=cni \
--rotate-certificates \
--pod-infra-container-image=registry.aliyuncs.com/google_containers/pause:3.2 \
--alsologtostderr=true \
--logtostderr=false \
--log-dir=/data/kubernetes \
--v=2
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target
EOF
cat > kube-proxy.yaml << "EOF"
apiVersion: kubeproxy.config.k8s.io/v1alpha1
bindAddress: 172.16.97.30
clientConnection:
kubeconfig: /etc/kubernetes/kube-proxy.kubeconfig
clusterCIDR: 10.244.0.0/16
healthzBindAddress: 172.16.97.30:10256
kind: KubeProxyConfiguration
metricsBindAddress: 172.16.97.30:10249
mode: "ipvs"
EOF
cat > kube-proxy.service << "EOF"
[Unit]
Description=Kubernetes Kube-Proxy Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
WorkingDirectory=/data/kube-proxy
ExecStart=/usr/local/bin/kube-proxy \
--config=/etc/kubernetes/kube-proxy.yaml \
--alsologtostderr=true \
--logtostderr=false \
--log-dir=/data/kubernetes \
--v=2
Restart=on-failure
RestartSec=5
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
firewall-cmd --zone=public --add-port=9099/tcp --permanent
firewall-cmd --zone=public --add-port=10246/tcp --permanent
firewall-cmd --zone=public --add-port=10250/tcp --permanent
firewall-cmd --zone=public --add-port=10249/tcp --permanent
firewall-cmd --zone=public --add-port=10255/tcp --permanent
firewall-cmd --reload
cat > 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: coredns/coredns:1.8.4
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: 10.96.0.2
ports:
- name: dns
port: 53
protocol: UDP
- name: dns-tcp
port: 53
protocol: TCP
- name: metrics
port: 9153
protocol: TCP
EOF
5.负载均衡器准备
1.安装haproxy与keepalived
# yum -y install haproxy keepalived
2.HAProxy配置
cat >/etc/haproxy/haproxy.cfg<<"EOF"
global
maxconn 2000
ulimit-n 16384
log 127.0.0.1 local0 err
stats timeout 30s
defaults
log global
mode http
option httplog
timeout connect 5000
timeout client 50000
timeout server 50000
timeout http-request 15s
timeout http-keep-alive 15s
frontend monitor-in
bind *:33305
mode http
option httplog
monitor-uri /monitor
frontend k8s-master
bind 0.0.0.0:6443
bind 127.0.0.1:6443
mode tcp
option tcplog
tcp-request inspect-delay 5s
default_backend k8s-master
backend k8s-master
mode tcp
option tcplog
option tcp-check
balance roundrobin
default-server inter 10s downinter 5s rise 2 fall 2 slowstart 60s maxconn 250 maxqueue 256 weight 100
server k8s-master01 172.16.97.27:6443 check
server k8s-master02 172.16.97.28:6443 check
server k8s-master03 172.16.97.29:6443 check
EOF
3.KeepAlived配置
主从配置不一致，需要注意。
ha1:
cat >/etc/keepalived/keepalived.conf<<"EOF"
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
script_user root
enable_script_security
}
vrrp_script chk_apiserver {
script "/etc/keepalived/check_apiserver.sh"
interval 5
weight -5
fall 2
rise 1
}
vrrp_instance VI_1 {
state MASTER
interface eth0
mcast_src_ip 172.16.97.33
virtual_router_id 51
priority 100
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
172.16.97.35
}
track_script {
chk_apiserver
}
}
EOF
ha2:
cat >/etc/keepalived/keepalived.conf<<"EOF"
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
script_user root
enable_script_security
}
vrrp_script chk_apiserver {
script "/etc/keepalived/check_apiserver.sh"
interval 5
weight -5
fall 2
rise 1
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
mcast_src_ip 172.16.97.34
virtual_router_id 51
priority 99
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
172.16.97.35
}
track_script {
chk_apiserver
}
}
EOF
3.健康检查脚本
ha1及ha2均要配置
cat > /etc/keepalived/check_apiserver.sh <<"EOF"
#!/bin/bash
err=0
for k in $(seq 1 3)
do
check_code=$(pgrep haproxy)
if [[ $check_code == "" ]]; then
err=$(expr $err + 1)
sleep 1
continue
else
err=0
break
fi
done
if [[ $err != "0" ]]; then
echo "systemctl stop keepalived"
/usr/bin/systemctl stop keepalived
exit 1
else
exit 0
fi
EOF
chmod +x /etc/keepalived/check_apiserver.sh
4. 启动服务并验证
systemctl daemon-reload
systemctl enable --now haproxy
systemctl enable --now keepalived
5.防火墙上开放端口
firewall-cmd --zone=public --add-port=6443/tcp --permanent
firewall-cmd --reload
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