Centos7上安装docker

docker安装

• 在线安装

  yum install docker
  

• 启用服务

  systemctl start docker
  

• 开机启动

  systemctl enable docker
  

  查看链接：
  https://www.cnblogs.com/yufeng218/p/8370670.html

常见问题

• docker运行镜像的时候，提示：docker-runc not installed on system

  [root@iZbp1jcwx7sfb1yrnvpg84Z docker]# docker run hello-world
  shell-init: error retrieving current directory: getcwd: cannot access parent directories: No such file or directory
  Unable to find image 'hello-world:latest' locally
  Trying to pull repository docker.io/library/hello-world ... 
  sha256:0add3ace90ecb4adbf7777e9aacf18357296e799f81cabc9fde470971e499788: Pulling from docker.io/library/hello-world
  d1725b59e92d: Pull complete 
  Digest: sha256:0add3ace90ecb4adbf7777e9aacf18357296e799f81cabc9fde470971e499788
  Status: Downloaded newer image for docker.io/hello-world:latest
  /usr/bin/docker-current: Error response from daemon: shim error: docker-runc not installed on system.
  
  

  解决方案：

  [root@iZbp1jcwx7sfb1yrnvpg84Z docker]# cd /usr/libexec/docker/
  [root@iZbp1jcwx7sfb1yrnvpg84Z docker]# ln -s docker-runc-current docker-runc
  

  参考链接：https://www.cnblogs.com/cxbhakim/p/8862758.html

• docker运行镜像的时候，提示：exec: "docker-proxy": executable file not found in $PATH

  [root@iZbp1jcwx7sfb1yrnvpg84Z docker]# docker run -d -p 5000:5000 -v /home/datas/registry:/var/lib/registry registry
  acae4d30d40cdb209d86377505bab5215ef37c66a863033b16909719e1c76a53
  /usr/bin/docker-current: Error response from daemon: driver failed programming external connectivity on endpoint agitated_engelbart (7f225ce7048177e8ee4c5d77161bcf9d8bcc2597ea8307d1a10bcc3c9b20a4d3): exec: "docker-proxy": executable file not found in $PATH.
  
  

  解决方案：

  [root@iZbp1jcwx7sfb1yrnvpg84Z bin]# cd /usr/libexec/docker/
  [root@iZbp1jcwx7sfb1yrnvpg84Z docker]# ln -s docker-proxy-current docker-proxy
  

  参考链接：https://blog.csdn.net/hellofyy/article/details/80091635

• docker运行镜像的时候，提示：Bind for 0.0.0.0:5000 failed: port is already allocated

  调试这个问题花费了好长时间，因为无法通过netstat以及lsof看到究竟是什么应用占用了程序；后来我才发现原来是因为docker的原因；如果docker被run了两次

  [root@iZbp1jcwx7sfb1yrnvpg84Z docker]# docker run -d -p 5000:5000 -v /home/datas/registry:/var/lib/registry registry
  d6e57a3ed2bad6671df31acdc83cd32b9b6a136d2874ed34b77c99e37a858177
  /usr/bin/docker-current: Error response from daemon: driver failed programming external connectivity on endpoint ecstatic_goldstine (2521adff22666e908e773d6288ca03a30229aade2a1d68e8fcb250254fdc3353): Bind for 0.0.0.0:5000 failed: port is already allocated.
  

  第一次失败，那么这个端口将会被一直占用，即使docker容器并没有创建。
  解决方案：

  #重启docker服务
  service docker restart
  

  也有人说要sudo rm /var/lib/docker/network/files/local-kv.db，但是在我看来并不需要
  参考链接：https://www.cnblogs.com/xiashiwendao/p/7859815.html

• 删除镜像时，提示：image is referenced in multiple repositories
  解决方案：
  删除时可以用repository和tag的方式来删除
  参考链接：https://blog.csdn.net/u013258415/article/details/80051082