云原生之使用docker部署centos系统测试环境
一、检查本地服务器系统版本
[root@node ~]# cat /etc/os-release
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"
CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"
[root@node ~]# cat /etc/centos-release
CentOS Linux release 7.6.1810 (Core)
二、检查docker版本
[root@node ~]# docker version
Client: Docker Engine - Community
Version: 20.10.17
API version: 1.41
Go version: go1.17.11
Git commit: 100c701
Built: Mon Jun 6 23:05:12 2022
OS/Arch: linux/amd64
Context: default
Experimental: true
Server: Docker Engine - Community
Engine:
Version: 20.10.17
API version: 1.41 (minimum version 1.12)
Go version: go1.17.11
Git commit: a89b842
Built: Mon Jun 6 23:03:33 2022
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.6.6
GitCommit: 10c12954828e7c7c9b6e0ea9b0c02b01407d3ae1
runc:
Version: 1.1.2
GitCommit: v1.1.2-0-ga916309
docker-init:
Version: 0.19.0
GitCommit: de40ad0
三、检查docker状态
[root@node ~]# systemctl status docker
● docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
Active: active (running) since Fri 2022-11-04 09:12:32 CST; 18h ago
Docs: https://docs.docker.com
Main PID: 10162 (dockerd)
Tasks: 62
Memory: 3.6G
CGroup: /system.slice/docker.service
├─10162 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
├─21803 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 27217 -container-ip 172.17.0.2 -container-port 27017
├─21808 /usr/bin/docker-proxy -proto tcp -host-ip :: -host-port 27217 -container-ip 172.17.0.2 -container-port 27017
├─33495 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 3548 -container-ip 172.17.0.3 -container-port 3306
├─33501 /usr/bin/docker-proxy -proto tcp -host-ip :: -host-port 3548 -container-ip 172.17.0.3 -container-port 3306
├─43634 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 8080 -container-ip 172.17.0.4 -container-port 80
├─43640 /usr/bin/docker-proxy -proto tcp -host-ip :: -host-port 8080 -container-ip 172.17.0.4 -container-port 80
├─59700 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 8098 -container-ip 172.17.0.5 -container-port 80
└─59705 /usr/bin/docker-proxy -proto tcp -host-ip :: -host-port 8098 -container-ip 172.17.0.5 -container-port 80
Nov 04 10:00:54 node dockerd[10162]: time="2022-11-04T10:00:54.645415843+08:00" level=info msg="Attempting next endpoint for pull after ...unknown"
Nov 04 11:46:29 node dockerd[10162]: time="2022-11-04T11:46:29.261326827+08:00" level=info msg="Attempting next endpoint for pull after ...unknown"
Nov 04 11:47:04 node dockerd[10162]: time="2022-11-04T11:47:04.769147449+08:00" level=info msg="Download failed, retrying (1/5): net/htt...timeout"
Nov 04 11:51:16 node dockerd[10162]: time="2022-11-04T11:51:16.548891252+08:00" level=error msg="Not continuing with pull after error: c...anceled"
Nov 04 11:55:42 node dockerd[10162]: time="2022-11-04T11:55:42.370401579+08:00" level=info msg="ignoring event" container=ac860c2aa163e2...kDelete"
Nov 04 14:31:26 node dockerd[10162]: time="2022-11-04T14:31:26.826919720+08:00" level=warning msg="reference for unknown type: applicati...:latest"
Nov 04 14:31:27 node dockerd[10162]: time="2022-11-04T14:31:27.105606415+08:00" level=warning msg="Error persisting manifest" digest="sha256:f2e...
Nov 04 14:31:27 node dockerd[10162]: time="2022-11-04T14:31:27.105748609+08:00" level=warning msg="Image docker.io/romainlecomte/lighthttpd-dock...
Nov 04 14:45:39 node dockerd[10162]: time="2022-11-04T14:45:39.628278832+08:00" level=error msg="Not continuing with pull after error: m...unknown"
Nov 04 14:45:39 node dockerd[10162]: time="2022-11-04T14:45:39.628408475+08:00" level=error msg="Handler for POST /v1.41/images/create r...unknown"
Hint: Some lines were ellipsized, use -l to show in full.
四、下载centos镜像
[root@node ~]# docker pull centos:7
7: Pulling from library/centos
Digest: sha256:9d4bcbbb213dfd745b58be38b13b996ebb5ac315fe75711bd618426a630e0987
Status: Image is up to date for centos:7
docker.io/library/centos:7
五、创建centos容器
1.运行centos容器
[root@node ~]# docker run -it --name centos_test centos:7 /bin/bash
[root@db4f4dfa3a84 /]#
2.检查容器内根目录
这里由于是直接创建容器并进入容器中，就直接进行后续操作了，
单独的容器进入命令：docker exec -it <容器名或ID> /bin/bash
[root@node ~]# docker run -it --name centos_test centos:7 /bin/bash
[root@db4f4dfa3a84 /]# ls
anaconda-post.log bin dev etc home lib lib64 media mnt opt proc root run sbin srv sys tmp usr var
[root@db4f4dfa3a84 /]# pwd
/
六、centos容器内部测试
1.安装ifconfig命令的软件包
[root@db4f4dfa3a84 /]# yum -y install net-tools
Loaded plugins: fastestmirror, ovl
Loading mirror speeds from cached hostfile
* base: mirrors.huaweicloud.com
* extras: mirrors.ustc.edu.cn
* updates: mirrors.ustc.edu.cn
Resolving Dependencies
--> Running transaction check
---> Package net-tools.x86_64 0:2.0-0.25.20131004git.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
===================================================================================================================================================
Package Arch Version Repository Size
===================================================================================================================================================
Installing:
net-tools x86_64 2.0-0.25.20131004git.el7 base 306 k
Transaction Summary
===================================================================================================================================================
Install 1 Package
Total download size: 306 k
Installed size: 917 k
Downloading packages:
net-tools-2.0-0.25.20131004git.el7.x86_64.rpm | 306 kB 00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : net-tools-2.0-0.25.20131004git.el7.x86_64 1/1
Verifying : net-tools-2.0-0.25.20131004git.el7.x86_64 1/1
Installed:
net-tools.x86_64 0:2.0-0.25.20131004git.el7
Complete!
2.查看容器内IP地址
[root@db4f4dfa3a84 /]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.17.0.6 netmask 255.255.0.0 broadcast 172.17.255.255
ether 02:42:ac:11:00:06 txqueuelen 0 (Ethernet)
RX packets 7037 bytes 25618849 (24.4 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 4655 bytes 269171 (262.8 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
loop txqueuelen 1000 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
3.测试与宿主机网络连通情况
[root@db4f4dfa3a84 /]# ping 192.168.3.166 -c 6
PING 192.168.3.166 (192.168.3.166) 56(84) bytes of data.
64 bytes from 192.168.3.166: icmp_seq=1 ttl=64 time=0.091 ms
64 bytes from 192.168.3.166: icmp_seq=2 ttl=64 time=0.130 ms
64 bytes from 192.168.3.166: icmp_seq=3 ttl=64 time=0.104 ms
64 bytes from 192.168.3.166: icmp_seq=4 ttl=64 time=0.109 ms
64 bytes from 192.168.3.166: icmp_seq=5 ttl=64 time=0.075 ms
64 bytes from 192.168.3.166: icmp_seq=6 ttl=64 time=0.092 ms
--- 192.168.3.166 ping statistics ---
6 packets transmitted, 6 received, 0% packet loss, time 5010ms
rtt min/avg/max/mdev = 0.075/0.100/0.130/0.018 ms
4.让centos容器后台运行
从容器退出，但不停止容器: Ctrl+P+Q
[root@node ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
db4f4dfa3a84 centos:7 "/bin/bash" 11 minutes ago Up 11 minutes centos_test
