# centos7安装Docker详细步骤

## 一、安装前必读

在安装 Docker 之前，先说一下配置，我这里是Centos7 Linux 内核：官方建议 3.10 以上，3.8以上貌似也可。

注意：本文的命令使用的是 root 用户登录执行，不是 root 的话所有命令前面要加 `sudo`

**1.查看当前的内核版本**

```
uname -r
```

**2.使用 root 权限更新 yum 包（生产环境中此步操作需慎重，看自己情况，学习的话随便搞）**

```
yum -y update
```

这个命令不是必须执行的，看个人情况，后面出现不兼容的情况的话就必须update了

```
注意 
yum -y update：升级所有包同时也升级软件和系统内核； 
yum -y upgrade：只升级所有包，不升级软件和系统内核
```

**3.卸载旧版本（如果之前安装过的话）**

```
yum remove docker  docker-common docker-selinux docker-engine
```

## 二、安装Docker的详细步骤

**1.安装需要的软件包， yum-util 提供yum-config-manager功能，另两个是devicemapper驱动依赖**

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

**2.设置 yum 源**

设置一个yum源，下面两个都可用

```
yum-config-manager --add-repo http://download.docker.com/linux/centos/docker-ce.repo（中央仓库）

yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo（阿里仓库）
```

3.选择docker版本并安装 （1）查看可用版本有哪些

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

![img](https://ask.qcloudimg.com/http-save/yehe-6025150/byk1zckvo3.png?imageView2/2/w/1620)

（2）选择一个版本并安装：`yum install docker-ce-版本号`

```
yum install -y docker-ce docker-ce-cli containerd.io    //安装最新版本docker及其工具
```

![img](https://ask.qcloudimg.com/http-save/yehe-6025150/04sfh9aucx.png?imageView2/2/w/1620)

出现下图说明安装成功

![img](https://ask.qcloudimg.com/http-save/yehe-6025150/flgsgy7o0y.png?imageView2/2/w/1620)

4.启动 Docker 并设置开机自启

```
systemctl start docker
systemctl enable docker
```


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