CentOS Docker 安装
Docker 可以运行在 CentOS 上,但对 CentOS 系统版本和内核版本有一定的要求
- CentOS 的版本必须在 6.5+ ,且必须是
64
位,然后必须是发行版本 - 如果是
Docker CE
,则要求系统版本是7.0+
- 如果是 CentOS 7 ,则要求系统内核版本为 3.10 以上
- 如果是 CentOS 6.5 或更高的版本的 CentOS 上,则要求系统内核版本为 2.6.32-431 或者更高版本
查看 CentOS 系统内核版本
如果你不确定自己的 CentOS 的内核版本是多少,可以使用 uname -r
命令查看一下
[root@localhost ~]# uname -r 3.10.0-327.el7.x86_64
CentOS 安装 Docker
目前最快速的安装 Docker
的方式是使用官方给出的脚本 https://get.docker.com/
只需要在终端里输入以下命令即可开始安装
[root@localhost ~]# curl -fsSL get.docker.com -o get-docker.sh [root@localhost ~]# sudo sh get-docker.sh ... ... If you would like to use Docker as a non-root user, you should now consider adding your user to the "docker" group with something like: sudo usermod -aG docker your-user Remember to log out and back in for this to take effect! WARNING: Adding a user to the "docker" group grants the ability to run containers which can be used to obtain root privileges on the docker host. Refer to https://docs.docker.com/engine/security/security/#docker-daemon-attack-surface for more information.
如果你使用的是 root
用户,可以先轻松下再回来,如果你使用的是普通用户,那么需要 sudo sh get-docker.sh
,然后输入登录密码
稍等片刻,Docker 就会安装完毕,是不是很省事,因为我们连一张图都没发
可以安装完成后最后那几段提示
If you would like to use Docker as a non-root user, you should now consider adding your user to the "docker" group with something like: sudo usermod -aG docker your-user Remember that you will have to log out and back in for this to take effect!
意思是说,如果以非 root
用户可以运行 docker
时,需要执行 sudo usermod -aG docker twle
命令然后重新登陆,否则会有如下报错
[yufei@localhost ~]docker fun hello-world docker: Cannot connect to the Docker daemon. Is the docker daemon running on this host ? ...
启动 Docker 服务
如果是 Centos 7 以上版本,则使用下面的命令启动 Docker 服务
systemctl start docker
如果是较低的版本,则使用下面的命令启动 Docker 服务
service docker start
Docker Hello World
我们可以使用 docker run hello-world
命令来检查下是否安装成功
[root@localhost ~]# docker run hello-world Unable to find image 'hello-world:latest' locally latest: Pulling from library/hello-world 9bb5a5d4561a: Pull complete Digest: sha256:f5233545e43561214ca4891fd1157e1c3c563316ed8e237750d59bde73361e77 Status: Downloaded newer image for hello-world:latest Hello from Docker! This message shows that your installation appears to be working correctly. To generate this message, Docker took the following steps: 1. The Docker client contacted the Docker daemon. 2. The Docker daemon pulled the "hello-world" image from the Docker Hub. (amd64) 3. The Docker daemon created a new container from that image which runs the executable that produces the output you are currently reading. 4. 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://hub.docker.com/ For more examples and ideas, visit: https://docs.docker.com/engine/userguide/
如果运行没有错误,那么安装成功