1. 在web 程序里 执行 ’whoami‘ 语句， 返回的 用户（user）是 apache
2. 在 ssh 窗口，模拟 apache 用户 执行 docker ps 命令,返回一下错误：
Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get "http://%2Fvar%2Frun%2Fdocker.sock/v1.24/containers/json": dial unix /var/run/docker.sock: connect: permission denied
sudo -u apache docker ps Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get "http://%2Fvar%2Frun%2Fdocker.sock/v1.24/containers/json": dial unix /var/run/docker.sock: connect: permission denied
3. 一顿调查，找到下面这篇文章，通过 sudo chmod 777 /var/run/docker.sock 这句命令解决了
[问题解决]Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock - everfight - 博客园写了一个脚本读取docker日志，发生报错：Got permission denied while trying to connect to the Docker daemon socket at uhttps://www.cnblogs.com/everfight/p/docker_sock.html
[root@docker-host ~]# [root@docker-host ~]# [root@docker-host ~]# sudo -u apache docker ps Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get "http://%2Fvar%2Frun%2Fdocker.sock/v1.24/containers/json": dial unix /var/run/docker.sock: connect: permission denied [root@docker-host ~]# [root@docker-host ~]# [root@docker-host ~]# [root@docker-host ~]# [root@docker-host ~]# sudo chmod 777 /var/run/docker.sock [root@docker-host ~]# [root@docker-host ~]# [root@docker-host ~]# [root@docker-host ~]# sudo -u apache docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES c5f57c9f840e testl "/usr/sbin/init" 8 weeks ago Up 4 days 0.0.0.0:8083->80/tcp, :::8083->80/tcp pia-dl-01
4. web 程序里 也加上这句，正常执行了；
