docs: update docker/install

docker/install.md

@@ -2,7 +2,7 @@
 title: docker的安装卸载
 description: docker的安装与卸载
 published: true
-date: 2021-12-09T06:34:53.251Z
+date: 2021-12-09T06:35:41.502Z
 tags: docker
 editor: markdown
 dateCreated: 2021-08-02T07:22:52.894Z
@@ -66,7 +66,7 @@ $ yum install -y docker-ce-17.03.2.ce-1.el7.centos.x86_64.rpm
 环境：contos7.3(内核需为3.10+)
 
 ```bash
-cat /etc/redhat-release
+$ cat /etc/redhat-release
 # CentOS Linux release 7.3.1611 (Core)
 ```
 
@@ -77,16 +77,16 @@ cat /etc/redhat-release
 1. 解压与安装
 
 ```bash
-cd /usr/local/resource/docker
-tar -xzvf docker-18.06.3-ce.tar
+$ cd /usr/local/resource/docker
+$ tar -xzvf docker-18.06.3-ce.tar
 # 将二进制文件移动到bin下
-mv  /usr/local/resource/docker/docker/*  /usr/bin/
+$ mv  /usr/local/resource/docker/docker/*  /usr/bin/
 ```
 
 2. 编写 docker.service
 
 ```bash
-vim /etc/systemd/system/docker.service
+$ vim /etc/systemd/system/docker.service
 ```
 
 3. 将以下内容粘贴进去：
@@ -130,13 +130,13 @@ WantedBy=multi-user.target
 4. 授予执行权限
 
 ```bash
-chmod +x /etc/systemd/system/docker.service
+$ chmod +x /etc/systemd/system/docker.service
 ```
 
 5. 重载service
 
 ```bash
-systemctl daemon-reload
+$ systemctl daemon-reload
 ```
 
 #### 启动docker