1. 安装docker-ce [root]，ce为docker社区版，免费，ee版为企业版，收费
列出所有已安装docker
# rpm -qa | grep docker
删除已安装docker
# rpm -e rpmname
安装docker-ce
# yum install docker-ce.x86_64 # 此命令会自动安装相关依赖包
配置Daocloud加速
# curl -sSL https://get.daocloud.io/daotools/set_mirror.sh | sh -s http://8ad7943c.m.daocloud.io
2. 开启dock服务，并设置开机自启 [root]
# systemctl start docker
# systemctl enable docker.service
3. 测试docker [root]
# docker run hello-world # 会弹出如下信息，说明安装成功
Hello from Docker!
This message shows that your installation appears to be working correctly. To generate this message, Docker took the following steps:
. The Docker client contacted the Docker daemon.
. The Docker daemon pulled the "hello-world" image from the Docker Hub.
(amd64)
. The Docker daemon created a new container from that image which runs the
executable that produces the output you are currently reading.
. The Docker daemon streamed that output to the Docker client, which sent it
to your terminal. To try something more ambitious, you can run an Ubuntu container with:
$ docker run -it ubuntu bash Share images, automate workflows, and more with a free Docker ID:
https://cloud.docker.com/ For more examples and ideas, visit:
https://docs.docker.com/engine/userguide/
# docker info #此命令可以查看dock内image和container信息
4. 使特定普通用户可以执行dock命令 [root]
# visudo
在最下方加入此行，此行会允许特定用户以sudo方式运行docker，第一次运行时要求输入该特定用户的密码，以后每隔5分钟重复运行docker命令时需要输入密码：
#docker
username ALL=(ALL) /usr/bin/docker
下面这行的区别在于，不需要输入sudo密码，但是并不安全
#docker
username ALL=(ALL) NOPASSWD: /usr/bin/docker
设置/usr/bin/docker别名
# alias docker="sudo /usr/bin/docker"
直接在命令行输入上述命令时，此命令不会永久生效，如果想永久生效，将其加入对应用户的.bashrc中即可
vim ~/.bashrc
# .bashrc # User specific aliases and functions alias rm='rm -i'
alias cp='cp -i'
alias mv='mv -i'
alias docker="sudo /usr/bin/docker" # Source global definitions
if [ -f /etc/bashrc ]; then
. /etc/bashrc
fi
...
5. 测试 [username]
配置完上述命令之后，指定的普通用户就可以直接运行docker命令了
# dock info
参考自：
http://cloud.51cto.com/art/201508/488478.htm