docker服务起不来原因及解决

报错 关键词：
Failed to start Docker Application Container Engine.

Failed to find iptables: exec: \"iptables\": executable file not found in $PATH

failed to start daemon: Error initializing network controller: error obtaining controller instance: failed to create NAT chain DOCKER: Iptables not found

问题

docker指令无法使用，docker服务未正确运行。

执行docker images，报错

Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

无法连接docker daemon守护程序，无法连接服务socket，docker服务启动失败。

原因排查

查看docker服务的状态

执行 systemctl status docker 查看docker服务的状态
报错

● docker.service - Docker Application Container Engine
   Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
   Ac