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一、Centos环境安装Docker

1.1 在线安装Docker

参考官方文档安装：https://docs.docker.com/engine/install/centos/

1、更新yum

yum update

2、安装工具包

sudo yum install -y yum-utils

3、设置镜像源

sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo   # 慢## 阿里云镜像源
sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo #快##腾讯镜像源
sudo yum-config-manager --add-repo https://mirrors.cloud.tencent.com/dockerce/linux/centos/docker-ce.repo

4、安装前卸载原有的docker

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

5、安装最新版本的docker ce

sudo yum install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

6、启动docker

sudo systemctl start docker

7、设置开机启动docker

sudo systemctl enable docker

8、安装好之后查看docker 版本

docker -v

9、配置容器镜像加速地址

# 需要确定/etc下面是否有docker这个文件夹，若没有则需要使用下面的命令进行创建
sudo mkdir -p /etc/docker
# 创建配置文件daemon.json 并写入一下内容
sudo tee /etc/docker/daemon.json <<-'EOF'
{
"registry-mirrors": ["https://mirror.ccs.tencentyun.com"] # 可以替换成其他地址
}
EOFsudo tee /etc/docker/daemon.json <<-'EOF'
{"registry-mirrors": ["https://docker.m.daocloud.io","https://docker.1panel.live","https://hub.rat.dev"]
}
EOF## 科大镜像：https://docker.mirrors.ustc.edu.cn
## 网易：http://hub-mirror.c.163.com
## 腾讯云：https://mirror.ccs.tencentyun.com
## 阿里云：https://<你的ID>.mirror.aliyuncs.com

10、重载配置

sudo systemctl daemon-reload

11、重启Docker

sudo systemctl restart docker

12、验证是否可用

docker ps # 查询正在运行的容器列表

1.2 离线安装Docker

1、Docker下载到指定目录

wget https://download.docker.com/linux/static/stable/x86_64/docker-20.10.9.tgz

2、解压缩

# 解压下载的文件
tar xf docker-20.10.9.tgz# 查看解压出的目录
# ls docker
containerd       containerd-shim-runc-v2  docker   docker-init   runc
containerd-shim  ctr                      dockerd  docker-proxy

3、将解压出来的docker文件内容移动到 /usr/bin/ 目录下

cp docker/* /usr/bin/

4、将docker注册为service

cat /etc/systemd/system/docker.service
vi /etc/systemd/system/docker.service# 内容如下
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
Wants=network-online.target
[Service]
Type=notify
# the default is not to use systemd for cgroups because the delegate issues
still
# exists and systemd currently does not support the cgroup feature set required
# for containers run by docker
ExecStart=/usr/bin/dockerd
ExecReload=/bin/kill -s HUP $MAINPID
# Having non-zero Limit*s causes performance problems due to accounting overhead
# in the kernel. We recommend using cgroups to do container-local accounting.
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
# Uncomment TasksMax if your systemd version supports it.
# Only systemd 226 and above support this version.
#TasksMax=infinity
TimeoutStartSec=0
# set delegate yes so that systemd does not reset the cgroups of docker
containers
Delegate=yes
# kill only the docker process, not all processes in the cgroup
KillMode=process
# restart the docker process if it exits prematurely
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s
[Install]
WantedBy=multi-user.target

5、启动Docker

chmod +x /etc/systemd/system/docker.service #添加文件权限并启动docker
systemctl daemon-reload #重载unit配置文件
systemctl start docker #启动Docker
systemctl enable docker.service #设置开机自启

6、验证

systemctl status docker #查看Docker状态
docker -v #查看Docker版本
docker info

1.3 快速安装Docker

详情请看（能一键安装docker）：https://github.com/tech-shrimp/docker_installer