linux 安装 docker

> 本文由 [简悦 SimpRead](http://ksria.com/simpread/) 转码， 原文地址 [www.cnblogs.com](https://www.cnblogs.com/kingsonfu/p/11576797.html)

### 1、安装环境

此处在 Centos7 进行安装，可以使用以下命令查看 CentOS 版本

```
lsb_release -a
```

![](https://img2018.cnblogs.com/blog/761230/201909/761230-20190920092034990-377974794.png)

在 CentOS 7 安装 docker 要求系统为 64 位、系统内核版本为 3.10 以上，可以使用以下命令查看

```
uname -r
```

![](https://img2018.cnblogs.com/blog/761230/201909/761230-20190920092306272-1825494524.png)

### 2、用 yum 源安装

**2.1 查看是否已安装 docker 列表**

```
yum list installed | grep docker
```

![](https://img2018.cnblogs.com/blog/761230/201909/761230-20190924101015120-484595522.png)

**2.2 安装 docker**

```
yum -y install docker
```

-y 表示不询问安装，直到安装成功，安装完后再次查看安装列表

![](https://img2018.cnblogs.com/blog/761230/201909/761230-20190924101635249-774913670.png)

**2.3 启动 docker**

```
systemctl start docker
```

**2.4 查看 docker 服务状态**

```
systemctl status docker
```

![](https://img2018.cnblogs.com/blog/761230/201909/761230-20190924101735498-1013963263.png)

以上说明 docker 安装成功

### 3、离线安装模式

**3.1 安装包官方地址**：[https://download.docker.com/linux/static/stable/x86_64/](https://download.docker.com/linux/static/stable/x86_64/)

可以先下载到本地，然后通过 ftp 工具上传到服务器上，或者在服务器上使用命令下载

```
wget https://download.docker.com/linux/static/stable/x86_64/docker-18.06.3-ce.tgz
```

**3.2 解压**

```
tar -zxvf docker-18.06.3-ce.tgz
```

**3.3 将解压出来的 docker 文件复制到 /usr/bin/ 目录下**

```
cp docker/* /usr/bin/
```

**3.4 在 / etc/systemd/system / 目录下新增 docker.service 文件**，内容如下，这样可以将 docker 注册为 service 服务

```
[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 --selinux-enabled=false --insecure-registry=127.0.0.1
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
```

此处的 --insecure-registry=127.0.0.1（此处改成你私服 ip）设置是针对有搭建了自己私服 Harbor 时允许 docker 进行不安全的访问，否则访问将会被拒绝。

**3.5 启动 docker**

给 docker.service 文件添加执行权限

```
chmod +x /etc/systemd/system/docker.service
```

重新加载配置文件（每次有修改 docker.service 文件时都要重新加载下）

```
systemctl daemon-reload
```

启动

```
systemctl start docker
```

设置开机启动

```
systemctl enable docker.service
```

查看 docker 服务状态

```
systemctl status docker
```

![](https://img2018.cnblogs.com/blog/761230/201909/761230-20190924100503875-876834976.png)

上图表示 docker 已安装成功