Centos8安装Docker

官网

官网：https://www.docker.com
文档地址：https://docs.docker.com 超级详细的docker文档
仓库地址：https://hub.docker.com push pull 镜像发布

1、环境准备

# 查看系统内核和操作系统版本
[root@root]# uname -r
4.18.0-193.el8.x86_64
[root@root]# cat /etc/redhat-release 
CentOS Linux release 8.2.2004 (Core)

2、安装

2.1、卸载就版本docker

[root@root]# yum remove docker \
                  docker-client \
                  docker-client-latest \
                  docker-common \
                  docker-latest \
                  docker-latest-logrotate \
                  docker-logrotate \
                  docker-engine

2.2、安装仓库

[root@root]# sudo yum install -y yum-utils

2.3、设置源地址

[root@root]# sudo yum-config-manager \
            https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

配置CentOS8的yum源，参考：CentOS8 配置阿里云的yum源 - 简书

2.4、安装Docker Engine-Community

[root@root]# sudo yum install docker-ce docker-ce-cli containerd.io docker-compose-plugin

查看官方帮助文档：https://docs.docker.com/engine/install/centos/

2.4.1、这里安装会报错

conflicting requests - nothing provides container-selinux >= 2:2.74 needed by containerd

原因：container-selinux没有安装或者版本太低

解决方案：下载对应的 rpm 包，并且安装

[root@root]# wget https://vault.centos.org/centos/8/AppStream/x86_64/os/Packages/container-selinux-2.124.0-1.gitf958d0c.module_el8.3.0+569+1bada2e4.noarch.rpm
[root@root]# rpm -ivh container-selinux-2.124.0-1.gitf958d0c.module_el8.3.0+569+1bada2e4.noarch.rpm

版本下载地址 https://pkgs.org/download/container-selinux

2.4.2、安装 rpm 完成之后，重复步骤 2.4

2.5、确认是否安装成功

[root@root]# docker --version
Docker version 20.10.17, build 100c701

2.6、启动运行

[root@root]# systemctl status docker

2.7、运行 helloworld

[root@root]# docker run hello-world
#本地没有找到hello-world的镜像
Unable to find image 'hello-world:latest' locally
# 去下载最新的hello-world镜像
latest: Pulling from library/hello-world
#下载成功
2db29710123e: Pull complete
Digest: sha256:13e367d31ae85359f42d637adf6da428f76d75dc9afeb3c21faea0d976f5c651
Status: Downloaded newer image for hello-world:latest
#看见这句，说明docker已安装成功
Hello from Docker!
This message shows that your installation appears to be working correctly.

2.7.1、这里会出现一个错

Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

原因：docker宕机

2.7.1.1、使用命令查看

[root@root]# systemctl status docker
● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
   Active: inactive (dead)
     Docs: https://docs.docker.com

2.7.1.2、设置开机启动

[root@root]# systemctl enable docker

2.7.1.3、重启

[root@root]# systemctl restart docker

2.7.1.4、查看状态

[root@root]# 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 2024-05-31 14:10:28 CST; 7s ago
     Docs: https://docs.docker.com
 Main PID: 912446 (dockerd)
    Tasks: 8
   Memory: 30.2M
   CGroup: /system.slice/docker.service
           └─912446 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock

2.7.1.5、重复步骤 2.7

2.8、查看镜像

[root@root]# docker images
REPOSITORY    TAG       IMAGE ID       CREATED        SIZE
hello-world   latest    feb5d9fea6a5   9 months ago   13.3kB