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75 lines
3.4 KiB
Markdown
75 lines
3.4 KiB
Markdown
How to install Docker on CentOS 7
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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.
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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.
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One of the limitation of Docker is that it can be used only on **64bit hosts** OS.
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In this post we will discuss how to install docker in CentOS 7.x
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### Installation of Docker on CentOS 7 ###
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Docker package is included in the default CentOS-Extras repository. So to install docker , simply run below yum command :
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[root@localhost ~]# yum install docker
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### Start the Docker Service ###
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Once the Installation is finished , start docker service and enable it at boot using below commands
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[root@localhost ~]# service docker start
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[root@localhost ~]# chkconfig docker on
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**Download the official Centos images Locally**
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[root@localhost ~]# docker pull centos
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Pulling repository centos
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192178b11d36: Download complete
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70441cac1ed5: Download complete
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ae0c2d0bdc10: Download complete
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511136ea3c5a: Download complete
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5b12ef8fd570: Download complete
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**Verify CentOS images that have been fetched :**
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[root@localhost ~]# docker images centos
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REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
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centos centos5 192178b11d36 2 weeks ago 466.9 MB
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centos centos6 70441cac1ed5 2 weeks ago 215.8 MB
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centos centos7 ae0c2d0bdc10 2 weeks ago 224 MB
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centos latest ae0c2d0bdc10 2 weeks ago 224 MB
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**Run a Docker Container :**
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[root@localhost ~]# docker run -i -t centos /bin/bash
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[root@dbf66395436d /]#
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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 .
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[root@cd05639b3f5c /]# cat /etc/redhat-release
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CentOS Linux release 7.0.1406 (Core)
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[root@cd05639b3f5c /]# exit
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exit
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[root@localhost ~]#
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We can also search Containers based on fedora & ubuntu OS.
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[root@localhost ~]# docker search ubuntu
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[root@localhost ~]# docker search fedora
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**Display the list of running containers **
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--------------------------------------------------------------------------------
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via: http://www.linuxtechi.com/install-docker-on-centos-7/
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作者：[Pradeep Kumar][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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[a]:http://www.linuxtechi.com/author/pradeep/ |