{"id":3144,"date":"2018-12-26T15:26:18","date_gmt":"2018-12-26T09:56:18","guid":{"rendered":"https:\/\/pheonixsolutions.com\/blog\/?p=3144"},"modified":"2019-01-18T10:07:47","modified_gmt":"2019-01-18T04:37:47","slug":"how-to-install-docker-in-centos-7","status":"publish","type":"post","link":"https:\/\/pheonixsolutions.com\/blog\/how-to-install-docker-in-centos-7\/","title":{"rendered":"How to install Docker in Centos 7"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Date Posted : 20\/12\/2018<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>How to install Docker in Centos 7<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Docker is a most handy DevOps tool used nowadays. In this post, we will explain Docker-CE installation and uninstallation steps.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"prerequisites\">Prerequisites<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"os-requirements\">OS requirements<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">To install Docker CE, you need to maintained version of CentOS 7. Therefore, archived versions aren\u2019t supported or tested.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"uninstall-old-versions\">Uninstall old versions<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Older versions of Docker were called&nbsp;<code>docker<\/code>&nbsp;or&nbsp;<code>docker-engine<\/code>. If these are installed, uninstall them, along with associated dependencies.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code brush: plain; notranslate\"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n# yum remove docker \\\n                  docker-client \\\n                  docker-client-latest \\\n                  docker-common \\\n                  docker-latest \\\n                  docker-latest-logrotate \\\n                  docker-logrotate \\\n                  docker-selinux \\\n                  docker-engine-selinux \\\n                  docker-engine\n\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">It\u2019s OK if&nbsp;<code>yum<\/code>&nbsp;reports that none of these packages are installed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The contents of&nbsp;<code>\/var\/lib\/docker\/<\/code>, including images, containers, volumes, and networks, are preserved. The Docker CE package is now called&nbsp;<code>docker-ce<\/code>.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"install-docker-ce\">Install Docker CE<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Step by step procedure, to install your Docker CE on your VM <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>STEP 1: <\/strong> SET UP THE REPOSITORY<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> Install required packages.&nbsp;<code>yum-utils<\/code>&nbsp;provides the&nbsp;<code>yum-config-manager<\/code>&nbsp;utility, <\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code brush: plain; notranslate\"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n# yum install -y yum-utils \\\n  device-mapper-persistent-data \\\n  lvm2\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:0\">Use the following command to set up the<strong> stable <\/strong>repository. You always need the<strong> stable<\/strong> repository,<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code brush: plain; notranslate\"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n# yum-config-manager \\\n    --add-repo \\\n    https:\/\/download.docker.com\/linux\/centos\/docker-ce.repo\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\"><strong>STEP 2: <\/strong>Install the latest version of Docker CE .<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code brush: plain; notranslate\"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n# yum install docker-ce\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\"> If prompted to accept the GPG key, verify that the fingerprint matches<code>060A 61C5 1B55 8A7F 742B 77AA C52F EB6B 621E 9F35<\/code>, and if so, accept it. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>STEP 3:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you have multiple Docker repositories enabled, installing or updating without specifying a version in the<strong> yum install<\/strong> or<strong> yum update<\/strong> command always installs the highest possible version, which may not be appropriate for your stability needs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>STEP 4 <\/strong>: To install a specific version of Docker CE,<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code brush: plain; notranslate\"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n# yum list docker-ce --showduplicates | sort -r\n\ndocker-ce.x86_64     18.09.0.ce-1.el7.centos        docker-ce-stable\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\"><strong>STEP 5 <\/strong>:   start docker<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code brush: plain; notranslate\"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n# systemctl start docker\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\"><strong>STEP 6<\/strong> : Verify docker<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Verify that docker is installed correctly by running the hello-world image.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code brush: plain; notranslate\"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n# docker run hello-world\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\"><strong>STEP 7<\/strong> : Enable  docker <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">By enabling docker , it will run ,even after the reboot of VM.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code brush: plain; notranslate\"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n# systemctl Enable docker\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">Docker Installation is completed successfully.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"uninstall-docker-ce\">Uninstall Docker CE<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\n\nUninstall the Docker package:\n\n<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code brush: plain; notranslate\"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n# yum remove docker-ce\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\"> &nbsp;To delete all images, containers, and volumes: <br> <strong> Note<\/strong> :   You must delete any edited configuration files manually. <\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code brush: plain; notranslate\"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n# sudo rm -rf \/var\/lib\/docker\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">We hope that you have understand the setup. It is pretty easy and if you have any query\/concerns ,please comment below, we will answer your queries.<br><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Date Posted : 20\/12\/2018 How to install Docker in Centos 7 Docker is a most handy DevOps tool used nowadays. 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