解决 cannot connect to the docker daemon at unix ///var/run/docker.sock. is the docker daemon running

本文详细描述了如何解决Docker Daemon无法连接的问题，包括cannot connect to the docker daemon at unix ///var/run/docker.sock. is the docker daemon running，以及主机验证失败如host key verification failed.解决办法和解决 warning remote host identification has changed等问题。全面指南助你解决这些常见的IT运维难题。