jenkins docker守护进程运行？

Question

我正在创建一个管道，我从错误日志

获取以下内容

+ docker pull maven:3.3.3
Cannot connect to the Docker daemon. Is the docker daemon running on this host?

Hint: Some lines were ellipsized, use -l to show in full.
[root@centos ~]# systemctl status docker
● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
   Active: active (running) since Thu 2017-09-07 14:43:36 EDT; 18min ago

我不确定我错过了什么。