在centos7上安装docker

官方文档

https://docs.docker.com/engine/install/centos/

1.查看centos系统版本,本篇文章是在 centos7 上安装docker,注意系统版本

cat /etc/redhat-release

回显

CentOS Linux release 7.9.2009 (Core)

2.删除之前的版本(如果是新系统省略这一步)

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

注意:卸载 Docker 时，不会自动删除存储在其中 /var/lib/docker/ 的映像、容器、卷和网络。

3.选择安装方法

1. 可以设置 Docker 的存储库并从中安装，以便于安装和升级任务。这是官方推荐的方法。
2. 下载 RPM 软件包，手动安装它，并完全手动管理升级。这在无法访问 Internet 的系统上安装 Docker

这里选择第1种方法
新主机上首次安装 Docker Engine 之前，需要设置 Docker 存储库,安装一些工具

yum install -y yum-utils
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
网络不好使用下面这个
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

运行命令后回显
这里有可能报网络错误，有两个解决办法
1，使用代理
2，替换 docker-ce.repo 内容

adding repo from: https://download.docker.com/linux/centos/docker-ce.repo
grabbing file https://download.docker.com/linux/centos/docker-ce.repo to /etc/yum.repos.d/docker-ce.repo
repo saved to /etc/yum.repos.d/docker-ce.repo

4.安装 Docker Engine、containerd 和 Docker Compose，会自动安装最新版

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

2核2G 3M带宽的云主机10多秒钟就安装好了

有可能出现下面的错误

failure: repodata/repomd.xml from docker-ce-stable: [Errno 256] No more mirrors to try.
https://download.docker.com/linux/centos/7/x86_64/stable/repodata/repomd.xml: [Errno 14] curl#35 - "TCP connection reset by peer"

使用命令替换
sed -i 's/$releasever/7/g' /etc/yum.repos.d/docker-ce.repo
或者直接使用下面的内容
将 docker-ce.repo内容替换

[docker-ce-stable]
name=Docker CE Stable - $basearch
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/$basearch/stable
enabled=1
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg
 
[docker-ce-stable-debuginfo]
name=Docker CE Stable - Debuginfo $basearch
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/debug-$basearch/stable
enabled=0
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg
 
[docker-ce-stable-source]
name=Docker CE Stable - Sources
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/source/stable
enabled=0
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg
 
[docker-ce-edge]
name=Docker CE Edge - $basearch
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/$basearch/edge
enabled=0
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg
 
[docker-ce-edge-debuginfo]
name=Docker CE Edge - Debuginfo $basearch
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/debug-$basearch/edge
enabled=0
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg
 
[docker-ce-edge-source]
name=Docker CE Edge - Sources
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/source/edge
enabled=0
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg
 
[docker-ce-test]
name=Docker CE Test - $basearch
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/$basearch/test
enabled=0
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg
 
[docker-ce-test-debuginfo]
name=Docker CE Test - Debuginfo $basearch
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/debug-$basearch/test
enabled=0
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg
 
[docker-ce-test-source]
name=Docker CE Test - Sources
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/source/test
enabled=0
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg
 
[docker-ce-nightly]
name=Docker CE Nightly - $basearch
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/$basearch/nightly
enabled=0
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg
 
[docker-ce-nightly-debuginfo]
name=Docker CE Nightly - Debuginfo $basearch
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/debug-$basearch/nightly
enabled=0
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg
 
[docker-ce-nightly-source]
name=Docker CE Nightly - Sources
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/source/nightly
enabled=0
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg

运行查看可用版本（安装指定版本）

yum list docker-ce --showduplicates | sort -r

yum install -y docker-ce-26.1.4-1.el7 docker-ce-cli-26.1.4-1.el7 containerd.io docker-buildx-plugin docker-compose-plugin

5.启动 docker

systemctl start docker

6.查看是否启动成功

systemctl status docker

回显

● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
   Active: active (running) since Fri 2023-12-22 02:29:30 CST; 15min ago
     Docs: https://docs.docker.com
 Main PID: 32132 (dockerd)

说明已经启动成功了,可以使用了

docker-compose的路径为

/usr/libexec/docker/cli-plugins/docker-compose
ln -s /usr/libexec/docker/cli-plugins/docker-compose /usr/bin/docker-compose

配置docker
vi /etc/docker/daemon.json,写入
{
"registry-mirrors": ["https://镜像加速地址"]
}