在CentOS中安装docker

|---------------------------------------------------------------------------------------------------|
| 环境：CentOS 7 目的：安装docker、启动服务 依据： ++🔗官方文档++ |

一、前提

1、查看内核版本

uname -r

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| Tip：docker需要内核版本3.10以上。所以CentOS 7是最低要求 |

2、更新软件包

耗时较长

yum update -y

3、安装yum-utils软件包

yum -y install yum-utils

4、设置存储库

yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

打印返回

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| Loaded plugins: fastestmirror, langpacks 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 |

二、安装docker

不标注版本为最新版本

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

标注版本举例（3:24.0.0-1.el8 版本）

yum install docker-ce-3:24.0.0-1.el8 docker-ce-cli-3:24.0.0-1.el8 containerd.io docker-buildx-plugin docker-compose-plugin

三、启动docker

1、 查看版本

docker version

2、 启动服务

systemctl start docker

或

service docker start

3、查看服务

输入命令

systemctl status docker

或

service docker status

打印返回

● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
   Active: active (running) since Wed 2023-12-06 17:10:11 PST; 13min ago
     Docs: https://docs.docker.com
 Main PID: 9683 (dockerd)
    Tasks: 10
   Memory: 26.5M
   CGroup: /system.slice/docker.service
           └─9683 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock

Dec 06 17:10:10 localhost.localdomain dockerd[9683]: time="2023-12-06T17:10:10.604776861-08:00" level=info msg="Firewalld: docker zone already exists, returning"
Dec 06 17:10:11 localhost.localdomain dockerd[9683]: time="2023-12-06T17:10:11.011649899-08:00" level=info msg="Firewalld: interface docker0 already part of docker zone, returning"
Dec 06 17:10:11 localhost.localdomain dockerd[9683]: time="2023-12-06T17:10:11.067298553-08:00" level=info msg="Firewalld: interface docker0 already part of docker zone, returning"
Dec 06 17:10:11 localhost.localdomain dockerd[9683]: time="2023-12-06T17:10:11.447546399-08:00" level=info msg="Default bridge (docker0) is assigned with an IP address 172.17.0.0/16. Daemon option --bip can be used to...rred IP address"
Dec 06 17:10:11 localhost.localdomain dockerd[9683]: time="2023-12-06T17:10:11.666608075-08:00" level=info msg="Firewalld: interface docker0 already part of docker zone, returning"
Dec 06 17:10:11 localhost.localdomain dockerd[9683]: time="2023-12-06T17:10:11.853674881-08:00" level=info msg="Loading containers: done."
Dec 06 17:10:11 localhost.localdomain dockerd[9683]: time="2023-12-06T17:10:11.898342204-08:00" level=info msg="Docker daemon" commit=311b9ff graphdriver=overlay2 version=24.0.7
Dec 06 17:10:11 localhost.localdomain dockerd[9683]: time="2023-12-06T17:10:11.898526692-08:00" level=info msg="Daemon has completed initialization"
Dec 06 17:10:11 localhost.localdomain dockerd[9683]: time="2023-12-06T17:10:11.950866539-08:00" level=info msg="API listen on /run/docker.sock"
Dec 06 17:10:11 localhost.localdomain systemd[1]: Started Docker Application Container Engine.
Hint: Some lines were ellipsized, use -l to show in full.

四、一些问题？

1、启动服务报Failed to start docker.service: Unit not found.

执行systemctl start docker后出现以下错误

|-------------------------------------------------|
| Failed to start docker.service: Unit not found. |

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| 原因: docker服务没有正常安装上 解决方法: 执行docker version命令查看有没有打印版本 ① 若没有则重新安装docker，执行 yum -y install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin ②若仍无法解决，参考 ++🔗https://blog.csdn.net/weixin_53592309/article/details/124695944++ |

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参考官方文档： ++🔗https://docs.docker.com/engine/install/centos/++