From 94fb2afe8488a2c415e3141afbf2cc06fe988938 Mon Sep 17 00:00:00 2001 From: DeadFire Date: Thu, 27 Nov 2014 14:15:44 +0800 Subject: [PATCH] =?UTF-8?q?20141127-1=20=E9=80=89=E9=A2=98?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...41127 How to install Docker on CentOS 7.md | 75 +++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 sources/tech/20141127 How to install Docker on CentOS 7.md diff --git a/sources/tech/20141127 How to install Docker on CentOS 7.md b/sources/tech/20141127 How to install Docker on CentOS 7.md new file mode 100644 index 0000000000..d39a3ca5d8 --- /dev/null +++ b/sources/tech/20141127 How to install Docker on CentOS 7.md @@ -0,0 +1,75 @@ +How to install Docker on CentOS 7 +================================================================================ +Docker is an open-source tool that makes creating & managing **Linux containers(LXC)** easy. Containers are like lightweight VMs which can be started & stopped in milliseconds. Dockers help the system admin & coders to develop their application in a container and can further scale up to 1000 of nodes. + +The main difference between container and VM(Virtual machine) is that dockers provide **process based isolation** , whereas VM provides full isolation of resources. Virtual machine takes a minute to start where as container can be started in a second or less than a second. Container uses the Kernel of host OS , whereas VM uses the separate Kernel. + +One of the limitation of Docker is that it can be used only on **64bit hosts** OS. + +In this post we will discuss how to install docker in CentOS 7.x + +### Installation of Docker on CentOS 7 ### + +Docker package is included in the default CentOS-Extras repository. So to install docker , simply run below yum command : + + [root@localhost ~]# yum install docker + +### Start the Docker Service ### + +Once the Installation is finished , start docker service and enable it at boot using below commands + + [root@localhost ~]# service docker start + [root@localhost ~]# chkconfig docker on + +**Download the official Centos images Locally** + + [root@localhost ~]# docker pull centos + Pulling repository centos + 192178b11d36: Download complete + 70441cac1ed5: Download complete + ae0c2d0bdc10: Download complete + 511136ea3c5a: Download complete + 5b12ef8fd570: Download complete + +**Verify CentOS images that have been fetched :** + + [root@localhost ~]# docker images centos + REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE + centos centos5 192178b11d36 2 weeks ago 466.9 MB + centos centos6 70441cac1ed5 2 weeks ago 215.8 MB + centos centos7 ae0c2d0bdc10 2 weeks ago 224 MB + centos latest ae0c2d0bdc10 2 weeks ago 224 MB + +**Run a Docker Container :** + + [root@localhost ~]# docker run -i -t centos /bin/bash + [root@dbf66395436d /]# + +As we can see centos container has been started and we got the bash shell. In docker command we have used options like ‘-i attaches stdin and stdout’ and ‘-t allocates a terminal or console’ . To disconnect from container type exit . + + [root@cd05639b3f5c /]# cat /etc/redhat-release + CentOS Linux release 7.0.1406 (Core) + [root@cd05639b3f5c /]# exit + exit + [root@localhost ~]# + +We can also search Containers based on fedora & ubuntu OS. + + [root@localhost ~]# docker search ubuntu + [root@localhost ~]# docker search fedora + +**Display the list of running containers ** + +![](http://www.linuxtechi.com/wp-content/uploads/2014/11/docker-ps.png) + +-------------------------------------------------------------------------------- + +via: http://www.linuxtechi.com/install-docker-on-centos-7/ + +作者：[Pradeep Kumar][a] +译者：[译者ID](https://github.com/译者ID) +校对：[校对者ID](https://github.com/校对者ID) + +本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出 + +[a]:http://www.linuxtechi.com/author/pradeep/ \ No newline at end of file