在Ubuntu上安装lxc-docker后，你需要将你的用户添加到docker用户组:

sudo usermod -a -G docker myusername

这是因为套接字文件的权限:

srw-rw---- 1 root docker 0 Mar 20 07:43 /var/run/docker.sock

不要运行usermod没有“-a”，就像在其他评论中建议的那样，否则它会擦除你的额外组设置，只会离开“docker”组

事情是这样的:

➜  ~  id pawel
uid=1000(pawel) gid=1000(pawel) groups=1000(pawel),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),108(lpadmin),124(sambashare),998(docker)
➜  ~  usermod -G docker pawel
➜  ~  id pawel               
uid=1000(pawel) gid=1000(pawel) groups=1000(pawel),998(docker)

Docker calls itself a self-sufficient runtime for Linux containers. In simple terms it acts both as server and client. The $ docker version command query is internal to the Docker executable and not to the daemon/service running. $ docker images or $ docker ps or $ docker pull centos are commands which send queries to the docker daemon/service running. Docker by default supports TLS connections to its daemon/service. Only if the user you are logged in as is part of user group docker or you have used sudo before the command, e.g. $ sudo docker images, does it not require TLS connectivity.

访问Docker文档保护Docker守护进程套接字。

滚动一点到顶部，找到警告部分的清晰度。

我也有同样的问题。一个简单的服务docker重启就解决了这个问题。

在Linux Ubuntu/Mint上运行Docker所需要的一切:

sudo apt-get -y install lxc
sudo gpasswd -a ${USER} docker
newgrp docker
sudo service docker restart

可选地，如果上述方法不起作用，你可能需要安装两个额外的依赖项:

sudo apt-get -y install apparmor cgroup-lite
sudo service docker restart

另一个可能的原因是您的BIOS CPU可视化没有启用。先去启用它吧!

当我用Jenkins创建Docker映像时，我也遇到了同样的问题。简单地将用户添加到docker组，然后重新启动docker服务，在我的情况下，我不得不重新启动Jenkins服务。

这是我得到的错误:

http:///var/run/docker.sock/v1.19/build?cgroupparent=&cpuperiod=0&cpuquota=0&cpusetcpus=&cpusetmems=&cpushares=0&dockerfile=Dockerfile&memory=0&memswap=0&rm=1&t=59aec062a8dd8b579ee1b61b299e1d9d340a1340: dial unix /var/run/docker.sock: permission denied. Are you trying to connect to a TLS-enabled daemon without TLS?
FATAL: Failed to build docker image from project Dockerfile
java.lang.RuntimeException: Failed to build docker image from project Dockerfile

Solution:

[root@Jenkins ssh]# groupadd docker
[root@Jenkins ssh]# gpasswd -a jenkins docker
Adding user jenkins to group docker
[root@Jenkins ssh]# /etc/init.d/docker restart
Stopping docker:                                           [  OK  ]
Starting docker:                                           [  OK  ]
[root@Jenkins ssh]# /etc/init.d/jenkins restart
Shutting down Jenkins                                      [  OK  ]
Starting Jenkins                                           [  OK  ]
[root@Jenkins ssh]#