Introduction
This article will discuss about how to install Docker Community Edition (CE) or Docker CE in Linux CentOS 7. The way for installing Docker CE in Linux CentOS 7 is using yum package manager tool. The reason for using the yum package manager tool is because using the ‘curl’ command directly to process the installer to the shell command is not working. The following is an attempt to install it using the curl command feeding the installer to the shell script :
[root@localhost ~]# curl -fsSL https://get.docker.com/ | sh curl: (6) Could not resolve host: get.docker.com; Unknown error [root@localhost ~]# curl -fsSL http://get.docker.com/ | sh curl: (6) Could not resolve host: get.docker.com; Unknown error [root@localhost ~]#
The following installation step is using a reference from another article in this link. It is an article with the title of ‘Installing Docker Engine CE (Community Edition) on CentOS Linux 7’. Actually, the process to achieve it will be in several parts. The first part is the preparation part. Next part after will be the installation part. In the following after will be a part for just testing it.
Preparation Part
In this preparation part, it is actually important before the process for installing Docker CE using the yum package manager is possible, just do and execute several of the following things just to make sure :
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The first one is to check whether there are packages within the current installed repositories. Those are including duplicates in the package list with the name of ‘docker-ce’. Display it by sorting the output by executing the command below :
[root@localhost ~]# yum list docker-ce --showduplicates | sort -r .... docker-ce.x86_64 18.06.2.ce-3.el7 docker-ce-stable docker-ce.x86_64 18.06.1.ce-3.el7 docker-ce-stable docker-ce.x86_64 18.06.0.ce-3.el7 docker-ce-stable docker-ce.x86_64 18.03.1.ce-1.el7.centos docker-ce-stable docker-ce.x86_64 18.03.0.ce-1.el7.centos docker-ce-stable docker-ce.x86_64 17.12.1.ce-1.el7.centos docker-ce-stable docker-ce.x86_64 17.12.0.ce-1.el7.centos docker-ce-stable docker-ce.x86_64 17.09.1.ce-1.el7.centos docker-ce-stable docker-ce.x86_64 17.09.0.ce-1.el7.centos docker-ce-stable docker-ce.x86_64 17.06.2.ce-1.el7.centos docker-ce-stable docker-ce.x86_64 17.06.1.ce-1.el7.centos docker-ce-stable docker-ce.x86_64 17.06.0.ce-1.el7.centos docker-ce-stable docker-ce.x86_64 17.03.3.ce-1.el7 docker-ce-stable docker-ce.x86_64 17.03.2.ce-1.el7.centos docker-ce-stable docker-ce.x86_64 17.03.1.ce-1.el7.centos docker-ce-stable docker-ce.x86_64 17.03.0.ce-1.el7.centos docker-ce-stable * base: mirror.xxxxxxx.xxxxxx Available Packages [root@localhost ~]#
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Next, just execute the following command in order to remove the package associated with docker. Make sure to check first that it is not available. If it is exist and running properly, just use the already exist one. But if it is not, just to make sure that no other package with that name exist or available in the operating system type the following command :
[root@localhost ~]# yum remove docker docker-common docker-selinux docker-engine Loaded plugins: fastestmirror No Match for argument: docker No Match for argument: docker-common No Match for argument: docker-selinux No Match for argument: docker-engine No Packages marked for removal [root@localhost ~]# [root@localhost ~]# [root@localhost ~]#
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Following after, just install some packages below which has some sort of role for Docker CE to run properly :
[root@localhost ~]# sudo yum install -y yum-utils device-mapper-persistent-data lvm2 Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: mirror.xxxxxxx.xxxxxx * extras: mirror.xxxxxxx.xxxxxx * updates: mirror.xxxxxxx.xxxxxx Package yum-utils-1.1.31-54.el7_8.noarch already installed and latest version Resolving Dependencies --> Running transaction check ---> Package device-mapper-persistent-data.x86_64 0:0.8.5-3.el7_9.2 will be installed --> Processing Dependency: libaio.so.1(LIBAIO_0.4)(64bit) for package: device-mapper-persistent-data-0.8.5-3.el7_9.2.x86_64 --> Processing Dependency: libaio.so.1(LIBAIO_0.1)(64bit) for package: device-mapper-persistent-data-0.8.5-3.el7_9.2.x86_64 --> Processing Dependency: libaio.so.1()(64bit) for package: device-mapper-persistent-data-0.8.5-3.el7_9.2.x86_64 ---> Package lvm2.x86_64 7:2.02.187-6.el7_9.5 will be installed --> Processing Dependency: lvm2-libs = 7:2.02.187-6.el7_9.5 for package: 7:lvm2-2.02.187-6.el7_9.5.x86_64 --> Processing Dependency: liblvm2app.so.2.2(Base)(64bit) for package: 7:lvm2-2.02.187-6.el7_9.5.x86_64 --> Processing Dependency: libdevmapper-event.so.1.02(Base)(64bit) for package: 7:lvm2-2.02.187-6.el7_9.5.x86_64 --> Processing Dependency: liblvm2app.so.2.2()(64bit) for package: 7:lvm2-2.02.187-6.el7_9.5.x86_64 --> Processing Dependency: libdevmapper-event.so.1.02()(64bit) for package: 7:lvm2-2.02.187-6.el7_9.5.x86_64 --> Running transaction check ---> Package device-mapper-event-libs.x86_64 7:1.02.170-6.el7_9.5 will be installed ---> Package libaio.x86_64 0:0.3.109-13.el7 will be installed ---> Package lvm2-libs.x86_64 7:2.02.187-6.el7_9.5 will be installed --> Processing Dependency: device-mapper-event = 7:1.02.170-6.el7_9.5 for package: 7:lvm2-libs-2.02.187-6.el7_9.5.x86_64 --> Running transaction check ---> Package device-mapper-event.x86_64 7:1.02.170-6.el7_9.5 will be installed --> Finished Dependency Resolution Dependencies Resolved ============================================================================================================================================================================ Package Arch Version Repository Size ============================================================================================================================================================================ Installing: device-mapper-persistent-data x86_64 0.8.5-3.el7_9.2 updates 423 k lvm2 x86_64 7:2.02.187-6.el7_9.5 updates 1.3 M Installing for dependencies: device-mapper-event x86_64 7:1.02.170-6.el7_9.5 updates 192 k device-mapper-event-libs x86_64 7:1.02.170-6.el7_9.5 updates 192 k libaio x86_64 0.3.109-13.el7 base 24 k lvm2-libs x86_64 7:2.02.187-6.el7_9.5 updates 1.1 M Transaction Summary ============================================================================================================================================================================ Install 2 Packages (+4 Dependent packages) Total download size: 3.2 M Installed size: 8.1 M Downloading packages: (1/6): device-mapper-event-1.02.170-6.el7_9.5.x86_64.rpm | 192 kB 00:00:03 (2/6): device-mapper-event-libs-1.02.170-6.el7_9.5.x86_64.rpm | 192 kB 00:00:03 (3/6): device-mapper-persistent-data-0.8.5-3.el7_9.2.x86_64.rpm | 423 kB 00:00:00 (4/6): lvm2-2.02.187-6.el7_9.5.x86_64.rpm | 1.3 MB 00:00:00 (5/6): libaio-0.3.109-13.el7.x86_64.rpm | 24 kB 00:00:00 (6/6): lvm2-libs-2.02.187-6.el7_9.5.x86_64.rpm | 1.1 MB 00:00:00 ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Total 882 kB/s | 3.2 MB 00:00:03 Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : 7:device-mapper-event-libs-1.02.170-6.el7_9.5.x86_64 1/6 Installing : libaio-0.3.109-13.el7.x86_64 2/6 Installing : device-mapper-persistent-data-0.8.5-3.el7_9.2.x86_64 3/6 Installing : 7:device-mapper-event-1.02.170-6.el7_9.5.x86_64 4/6 Installing : 7:lvm2-libs-2.02.187-6.el7_9.5.x86_64 5/6 Installing : 7:lvm2-2.02.187-6.el7_9.5.x86_64 6/6 Verifying : 7:device-mapper-event-1.02.170-6.el7_9.5.x86_64 1/6 Verifying : 7:lvm2-libs-2.02.187-6.el7_9.5.x86_64 2/6 Verifying : device-mapper-persistent-data-0.8.5-3.el7_9.2.x86_64 3/6 Verifying : libaio-0.3.109-13.el7.x86_64 4/6 Verifying : 7:lvm2-2.02.187-6.el7_9.5.x86_64 5/6 Verifying : 7:device-mapper-event-libs-1.02.170-6.el7_9.5.x86_64 6/6 Installed: device-mapper-persistent-data.x86_64 0:0.8.5-3.el7_9.2 lvm2.x86_64 7:2.02.187-6.el7_9.5 Dependency Installed: device-mapper-event.x86_64 7:1.02.170-6.el7_9.5 device-mapper-event-libs.x86_64 7:1.02.170-6.el7_9.5 libaio.x86_64 0:0.3.109-13.el7 lvm2-libs.x86_64 7:2.02.187-6.el7_9.5 Complete! [root@localhost ~]#
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After that, just try to add the Docker CE repository to the operating system by typing the following command :
[root@localhost ~]# sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo Loaded plugins: fastestmirror adding repo from: https://download.docker.com/linux/centos/docker-ce.repo grabbing file https://download.docker.com/linux/centos/docker-ce.repo to /etc/yum.repos.d/docker-ce.repo repo saved to /etc/yum.repos.d/docker-ce.repo [root@localhost ~]#
Installation Step
So, the previous part is focusing on the preparation step for installing Docker CE. This part will just show the part for the installation of Docker CE. After successfully adding the necessary repository, just install the Docker CE by executing a command. Basically, just execute one single command to do it as follows :
[root@localhost ~]# sudo yum install docker-ce Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: mirror.xxxxxxx.xxxxxx * extras: mirror.xxxxxxx.xxxxxx * updates: mirror.xxxxxxx.xxxxxx docker-ce-stable | 3.5 kB 00:00:00 (1/2): docker-ce-stable/7/x86_64/updateinfo | 55 B 00:00:00 (2/2): docker-ce-stable/7/x86_64/primary_db | 67 kB 00:00:01 Resolving Dependencies --> Running transaction check ---> Package docker-ce.x86_64 3:20.10.10-3.el7 will be installed --> Processing Dependency: container-selinux >= 2:2.74 for package: 3:docker-ce-20.10.10-3.el7.x86_64 --> Processing Dependency: containerd.io >= 1.4.1 for package: 3:docker-ce-20.10.10-3.el7.x86_64 --> Processing Dependency: docker-ce-cli for package: 3:docker-ce-20.10.10-3.el7.x86_64 --> Processing Dependency: docker-ce-rootless-extras for package: 3:docker-ce-20.10.10-3.el7.x86_64 --> Running transaction check ---> Package container-selinux.noarch 2:2.119.2-1.911c772.el7_8 will be installed ---> Package containerd.io.x86_64 0:1.4.11-3.1.el7 will be installed ---> Package docker-ce-cli.x86_64 1:20.10.10-3.el7 will be installed --> Processing Dependency: docker-scan-plugin(x86-64) for package: 1:docker-ce-cli-20.10.10-3.el7.x86_64 ---> Package docker-ce-rootless-extras.x86_64 0:20.10.10-3.el7 will be installed --> Processing Dependency: fuse-overlayfs >= 0.7 for package: docker-ce-rootless-extras-20.10.10-3.el7.x86_64 --> Processing Dependency: slirp4netns >= 0.4 for package: docker-ce-rootless-extras-20.10.10-3.el7.x86_64 --> Running transaction check ---> Package docker-scan-plugin.x86_64 0:0.9.0-3.el7 will be installed ---> Package fuse-overlayfs.x86_64 0:0.7.2-6.el7_8 will be installed --> Processing Dependency: libfuse3.so.3(FUSE_3.2)(64bit) for package: fuse-overlayfs-0.7.2-6.el7_8.x86_64 --> Processing Dependency: libfuse3.so.3(FUSE_3.0)(64bit) for package: fuse-overlayfs-0.7.2-6.el7_8.x86_64 --> Processing Dependency: libfuse3.so.3()(64bit) for package: fuse-overlayfs-0.7.2-6.el7_8.x86_64 ---> Package slirp4netns.x86_64 0:0.4.3-4.el7_8 will be installed --> Running transaction check ---> Package fuse3-libs.x86_64 0:3.6.1-4.el7 will be installed --> Finished Dependency Resolution Dependencies Resolved ============================================================================================================================================================================ Package Arch Version Repository Size ============================================================================================================================================================================ Installing: docker-ce x86_64 3:20.10.10-3.el7 docker-ce-stable 23 M Installing for dependencies: container-selinux noarch 2:2.119.2-1.911c772.el7_8 extras 40 k containerd.io x86_64 1.4.11-3.1.el7 docker-ce-stable 28 M docker-ce-cli x86_64 1:20.10.10-3.el7 docker-ce-stable 29 M docker-ce-rootless-extras x86_64 20.10.10-3.el7 docker-ce-stable 8.0 M docker-scan-plugin x86_64 0.9.0-3.el7 docker-ce-stable 3.7 M fuse-overlayfs x86_64 0.7.2-6.el7_8 extras 54 k fuse3-libs x86_64 3.6.1-4.el7 extras 82 k slirp4netns x86_64 0.4.3-4.el7_8 extras 81 k Transaction Summary ============================================================================================================================================================================ Install 1 Package (+8 Dependent packages) Total download size: 93 M Installed size: 376 M Is this ok [y/d/N]: y Downloading packages: warning: /var/cache/yum/x86_64/7/docker-ce-stable/packages/containerd.io-1.4.11-3.1.el7.x86_64.rpm: Header V4 RSA/SHA512 Signature, key ID 621e9f35: NOKEY MB 00:00:02 ETA Public key for containerd.io-1.4.11-3.1.el7.x86_64.rpm is not installed (1/9): containerd.io-1.4.11-3.1.el7.x86_64.rpm | 28 MB 00:00:00 (2/9): docker-ce-20.10.10-3.el7.x86_64.rpm | 23 MB 00:00:01 (3/9): docker-ce-rootless-extras-20.10.10-3.el7.x86_64.rpm | 8.0 MB 00:00:00 (4/9): docker-scan-plugin-0.9.0-3.el7.x86_64.rpm | 3.7 MB 00:00:00 (5/9): docker-ce-cli-20.10.10-3.el7.x86_64.rpm | 29 MB 00:00:00 (6/9): container-selinux-2.119.2-1.911c772.el7_8.noarch.rpm | 40 kB 00:00:01 (7/9): fuse3-libs-3.6.1-4.el7.x86_64.rpm | 82 kB 00:00:01 (8/9): fuse-overlayfs-0.7.2-6.el7_8.x86_64.rpm | 54 kB 00:00:08 (9/9): slirp4netns-0.4.3-4.el7_8.x86_64.rpm | 81 kB 00:00:08 ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Total 9.5 MB/s | 93 MB 00:00:09 Retrieving key from https://download.docker.com/linux/centos/gpg Importing GPG key 0x621E9F35: Userid : "Docker Release (CE rpm) <[email protected]>" Fingerprint: 060a 61c5 1b55 8a7f 742b 77aa c52f eb6b 621e 9f35 From : https://download.docker.com/linux/centos/gpg Is this ok [y/N]: y Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : 2:container-selinux-2.119.2-1.911c772.el7_8.noarch 1/9 Installing : containerd.io-1.4.11-3.1.el7.x86_64 2/9 Installing : 1:docker-ce-cli-20.10.10-3.el7.x86_64 3/9 Installing : docker-scan-plugin-0.9.0-3.el7.x86_64 4/9 Installing : fuse3-libs-3.6.1-4.el7.x86_64 5/9 Installing : fuse-overlayfs-0.7.2-6.el7_8.x86_64 6/9 Installing : slirp4netns-0.4.3-4.el7_8.x86_64 7/9 Installing : 3:docker-ce-20.10.10-3.el7.x86_64 8/9 Installing : docker-ce-rootless-extras-20.10.10-3.el7.x86_64 9/9 Verifying : docker-ce-rootless-extras-20.10.10-3.el7.x86_64 1/9 Verifying : docker-scan-plugin-0.9.0-3.el7.x86_64 2/9 Verifying : 3:docker-ce-20.10.10-3.el7.x86_64 3/9 Verifying : fuse-overlayfs-0.7.2-6.el7_8.x86_64 4/9 Verifying : containerd.io-1.4.11-3.1.el7.x86_64 5/9 Verifying : slirp4netns-0.4.3-4.el7_8.x86_64 6/9 Verifying : 2:container-selinux-2.119.2-1.911c772.el7_8.noarch 7/9 Verifying : fuse3-libs-3.6.1-4.el7.x86_64 8/9 Verifying : 1:docker-ce-cli-20.10.10-3.el7.x86_64 9/9 Installed: docker-ce.x86_64 3:20.10.10-3.el7 Dependency Installed: container-selinux.noarch 2:2.119.2-1.911c772.el7_8 containerd.io.x86_64 0:1.4.11-3.1.el7 docker-ce-cli.x86_64 1:20.10.10-3.el7 docker-ce-rootless-extras.x86_64 0:20.10.10-3.el7 docker-scan-plugin.x86_64 0:0.9.0-3.el7 fuse-overlayfs.x86_64 0:0.7.2-6.el7_8 fuse3-libs.x86_64 0:3.6.1-4.el7 slirp4netns.x86_64 0:0.4.3-4.el7_8 Complete! [root@localhost ~]#
Testing Step
After successfully installing the Docker CE, just test it. Testing the Docker CE by doing the following execution of command :
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Following after, just try to execute the command for the installation.
[root@localhost ~]# docker Usage: docker [OPTIONS] COMMAND A self-sufficient runtime for containers Options: --config string Location of client config files (default "/root/.docker") -c, --context string Name of the context to use to connect to the daemon (overrides DOCKER_HOST env var and default context set with "docker context use") -D, --debug Enable debug mode -H, --host list Daemon socket(s) to connect to -l, --log-level string Set the logging level ("debug"|"info"|"warn"|"error"|"fatal") (default "info") --tls Use TLS; implied by --tlsverify --tlscacert string Trust certs signed only by this CA (default "/root/.docker/ca.pem") --tlscert string Path to TLS certificate file (default "/root/.docker/cert.pem") --tlskey string Path to TLS key file (default "/root/.docker/key.pem") --tlsverify Use TLS and verify the remote -v, --version Print version information and quit Management Commands: app* Docker App (Docker Inc., v0.9.1-beta3) builder Manage builds buildx* Build with BuildKit (Docker Inc., v0.6.3-docker) config Manage Docker configs container Manage containers context Manage contexts image Manage images manifest Manage Docker image manifests and manifest lists network Manage networks node Manage Swarm nodes plugin Manage plugins scan* Docker Scan (Docker Inc., v0.9.0) secret Manage Docker secrets service Manage services stack Manage Docker stacks swarm Manage Swarm system Manage Docker trust Manage trust on Docker images volume Manage volumes Commands: attach Attach local standard input, output, and error streams to a running container build Build an image from a Dockerfile commit Create a new image from a container's changes cp Copy files/folders between a container and the local filesystem create Create a new container diff Inspect changes to files or directories on a container's filesystem events Get real time events from the server exec Run a command in a running container export Export a container's filesystem as a tar archive history Show the history of an image images List images import Import the contents from a tarball to create a filesystem image info Display system-wide information inspect Return low-level information on Docker objects kill Kill one or more running containers load Load an image from a tar archive or STDIN login Log in to a Docker registry logout Log out from a Docker registry logs Fetch the logs of a container pause Pause all processes within one or more containers port List port mappings or a specific mapping for the container ps List containers pull Pull an image or a repository from a registry push Push an image or a repository to a registry rename Rename a container restart Restart one or more containers rm Remove one or more containers rmi Remove one or more images run Run a command in a new container save Save one or more images to a tar archive (streamed to STDOUT by default) search Search the Docker Hub for images start Start one or more stopped containers stats Display a live stream of container(s) resource usage statistics stop Stop one or more running containers tag Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE top Display the running processes of a container unpause Unpause all processes within one or more containers update Update configuration of one or more containers version Show the Docker version information wait Block until one or more containers stop, then print their exit codes Run 'docker COMMAND --help' for more information on a command. To get more help with docker, check out our guides at https://docs.docker.com/go/guides/ [root@localhost ~]# -
Last but not least, in order to make sure, just execute the following command to check the docker version :
[root@localhost ~]# docker version Client: Docker Engine - Community Version: 20.10.10 API version: 1.41 Go version: go1.16.9 Git commit: b485636 Built: Mon Oct 25 07:44:50 2021 OS/Arch: linux/amd64 Context: default Experimental: true Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? [root@localhost ~]#