Centos7.9安装Docker

一、关闭防火墙

systemctl stop firewalld  
systemctl disable firewalld
systemctl status firewalld 

二、关闭selinux

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

三、配置本地yum源(可选)

本地yum源安装Docker版本太低，安装可能会失败，可以配置阿里yum源

cat  > /etc/yum.repos.d/CentOS-Base.repo <<EOF

[base]
name=CentOS-\$releasever - Base
baseurl=file:///mnt
gpgcheck=0
enabled=1

EOF


mount -o loop /opt/soft/CentOS-7-x86_64-DVD-2009.iso /mnt

yum clean all && yum makecache

四、配置阿里yum源

cd /etc/yum.repos.d
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

yum install epel-release -y
yum install container-selinux -y    #安装最新的contain-selinux

yum clean all && yum makecache

五、移除旧版Docker

yum remove docker \
                  docker-client \
                  docker-client-latest \
                  docker-common \
                  docker-latest \
                  docker-latest-logrotate \
                  docker-logrotate \
                  docker-engine

六、安装依赖工具

yum install -y yum-utils device-mapper-persistent-data lvm2

七、设置Docker稳定仓库

yum-config-manager \
    --add-repo  \
    http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
    
sed -i 's/download.docker.com/mirrors.aliyun.com\/docker-ce/g' /etc/yum.repos.d/docker-ce.repo

yum makecache fast

八、安装Docker Engine(社区版)

yum install docker-ce docker-ce-cli containerd.io


安装报错:
containerd.io-1.6.33-3.1.el7.x86_64: [Errno 256] No more mirrors to try.
一般是网络不稳定引起的，重新安装即可

九、启动Docker

systemctl start docker
systemctl status docker
systemctl enable docker

十、验证Docker

docker -v
docker run hello-world
docker info

十一、镜像加速

cat  >  /etc/docker/daemon.json  << EOF

{
     "registry-mirrors": [
        "https://docker-0.unsee.tech",
        "https://docker.1ms.run",
        "https://docker.xuanyuan.me",
        "https://0vrv861z.mirror.aliyuncs.com",
        "http://hub-mirror.c.163.com",
        "https://docker.mirrors.ustc.edu.cn",
        "https://registry.docker-cn.com",
        "https://2a6bf1988cb6428c877f723ec7530dbc.mirror.swr.myhuaweicloud.com",
        "https://docker.m.daocloud.io",
        "https://hub-mirror.c.163.com",
        "https://mirror.baidubce.com",
        "https://your_preferred_mirror",
        "https://dockerhub.icu",
        "https://docker.registry.cyou",
        "https://docker-cf.registry.cyou",
        "https://dockercf.jsdelivr.fyi",
        "https://docker.jsdelivr.fyi",
        "https://dockertest.jsdelivr.fyi",
        "https://mirror.aliyuncs.com",
        "https://dockerproxy.com",
        "https://mirror.baidubce.com",
        "https://docker.m.daocloud.io",
        "https://docker.nju.edu.cn",
        "https://docker.mirrors.sjtug.sjtu.edu.cn",
        "https://docker.mirrors.ustc.edu.cn",
        "https://mirror.iscas.ac.cn",
        "https://docker.rainbond.cc"
      ]

}
 
EOF

十二、重启Docker

systemctl restart docker

十三、修改Docker默认存储位置

1.停止Docker

systemctl stop docker

Warning: Stopping docker.service, but it can still be activated by:
  docker.socket
 解决方法:
 systemctl status docker.socket
 systemctl stop docker.socket

2.查看Docker存储目录位置

docker info|grep -i root

 Docker Root Dir: /var/lib/docker

3.创建新的存储路径

mkdir /opt/docker

4.将数据迁移至新的存储路径

rsync -av --progress /var/lib/docker/* /opt/docker/

也可以使用mv命令移动文件，rsync命令更安全

rsync参数：
-a 表示归档模式，保持文件的权限、时间戳等信息。
-v 表示显示详细的输出。
--progress 显示进度。

5.修改Docker配置文件

添加 “data-root”: “/opt/docker”参数，注意参数后面有逗号

vi /etc/docker/daemon.json

{
     "data-root": "/opt/docker",
     "registry-mirrors": [
        "https://docker-0.unsee.tech",
        "https://docker.1ms.run",
        "https://docker.xuanyuan.me",
        "https://0vrv861z.mirror.aliyuncs.com",
        "http://hub-mirror.c.163.com",
        "https://docker.mirrors.ustc.edu.cn",
        "https://registry.docker-cn.com",
        "https://2a6bf1988cb6428c877f723ec7530dbc.mirror.swr.myhuaweicloud.com",
        "https://docker.m.daocloud.io",
        "https://hub-mirror.c.163.com",
        "https://mirror.baidubce.com",
        "https://your_preferred_mirror",
        "https://dockerhub.icu",
        "https://docker.registry.cyou",
        "https://docker-cf.registry.cyou",
        "https://dockercf.jsdelivr.fyi",
        "https://docker.jsdelivr.fyi",
        "https://dockertest.jsdelivr.fyi",
        "https://mirror.aliyuncs.com",
        "https://dockerproxy.com",
        "https://mirror.baidubce.com",
        "https://docker.m.daocloud.io",
        "https://docker.nju.edu.cn",
        "https://docker.mirrors.sjtug.sjtu.edu.cn",
        "https://docker.mirrors.ustc.edu.cn",
        "https://mirror.iscas.ac.cn",
        "https://docker.rainbond.cc"
      ]

}

6.重启Docker

systemctl daemon-reload
systemctl start docker

7.验证 Docker 存储目录

docker info|grep -i root

8.删除旧的Docker数据文件

rm -rf /var/lib/docker