Docker启动Get Permission Denied

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https://www.cnblogs.com/informatics/p/8276172.html

以下问题及解决方法都在Ubuntu16.04下，其他环境类似

问题描述

安装完docker后，执行docker相关命令，出现

”Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.26/images/json: dial unix /var/run/docker.sock: connect: permission denied“

原因

摘自docker mannual上的一段话

Manage Docker as a non-root userThe docker daemon binds to a Unix socket instead of a TCP port. By default that Unix socket is owned by the user root and other users can only access it using sudo. The docker daemon always runs as the root user.If you don’t want to use sudo when you use the docker command, create a Unix group called docker and add users to it. When the docker daemon starts, it makes the ownership of the Unix socket read/writable by the docker group.

大概的意思就是：docker进程使用Unix Socket而不是TCP端口。而默认情况下，Unix socket属于root用户，需要root权限才能访问。