docker的安装步骤

### docker 安装步骤

#### 上传对应的软件包

docker-19.03.8.tgz

docker-compose-Linux-x86_64



#### 解压安装包进行安装

1.解压

```
tar -xvf docker-19.03.8.tgz
```

2.将解压下来的docker文件内容移动到/usr/bin/目录下

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

3.将docker注册为service

```
vim /etc/systemd/system/docker.service
```

将以下配置加到docker.service中并保存

```
[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
```



#### 启动docker，并验证

添加文件权限，并启动docker服务

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

systemctl daemon-reload

systemctl start docker
```

设置开机自启docker

```
systemctl enable docker.service
```

验证查看docker状态

```
systemctl status docker

docker -v
```



### docker-compose 的安装

更改命名

```
mv docker-compose-Linux-x86_64 docker-compose
```

将文件复制到/usr/local/bin/目录下

```
cp docker-compose /usr/bin/docker-compose
```

为文件进行赋权限

```
chmod +x /usr/bin/docker-compose
```

验证是否安装成功

```
docker-compose version
```

验证结果如果出错

```
-bash: docker-compose: command not found
```

则需要将文件复制到/usr/bin/中，再进行赋权

```
cp docker-compose /usr/bin/
docker-compose version
```



### 使用docker进行安装镜像文件

此处以nginx为例

上传nginx.tar

```
[root@fastdfs software]# docker load -i nginx.tar
08249ce7456a: Loading layer [==================================================>] 83.9MB/83.9MB
d5b40e80384b: Loading layer [==================================================>] 62.01MB/62.01MB
b2f82de68e0d: Loading layer [==================================================>] 3.072kB/3.072kB
41451f050aa8: Loading layer [==================================================>] 4.096kB/4.096kB
44193d3f4ea2: Loading layer [==================================================>] 3.584kB/3.584kB
e7344f8a29a3: Loading layer [==================================================>] 7.168kB/7.168kB
Loaded image ID: sha256:55f4b40fe486a5b734b46bb7bf28f52fa31426bf23be068c8e7b19e58d9b8deb