You may reach me - jegan@tektutor.org
My YouTube Channel - https://www.youtube.com/c/JeganathanSwaminathan/videos
As CentOS 8.x has reached End of Life by 31st Dec 2021, RedHat stopped software updates from 31st Jan 2022. Hence, I would suggest you to use CentOS 7.x as it will reach its End of Life only by 30th June 2024.
sudo yum install -y yum-utils -y
sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
sudo yum install docker-ce docker-ce-cli containerd.io -y
The expected output is
(jegan@tektutor.org$)>sudo yum install -y yum-utils Loaded plugins: fastestmirror, langpacks Loading mirror speeds from cached hostfile * base: centos.excellmedia.net * epel: mirror.01link.hk * extras: centos.excellmedia.net * updates: centos.excellmedia.net Package yum-utils-1.1.31-54.el7_8.noarch already installed and latest version Nothing to do (jegan@tektutor.org$)>sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo Loaded plugins: fastestmirror, langpacks 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 (jegan@tektutor.org$)>sudo yum install docker-ce docker-ce-cli containerd.io Loaded plugins: fastestmirror, langpacks Loading mirror speeds from cached hostfile * base: centos.excellmedia.net * epel: epel.mirror.angkasa.id * extras: centos.excellmedia.net * updates: centos.excellmedia.net Resolving Dependencies --> Running transaction check ---> Package containerd.io.x86_64 0:1.4.13-3.1.el7 will be installed --> Processing Dependency: container-selinux >= 2:2.74 for package: containerd.io-1.4.13-3.1.el7.x86_64 ---> Package docker-ce.x86_64 3:20.10.12-3.el7 will be installed --> Processing Dependency: docker-ce-rootless-extras for package: 3:docker-ce-20.10.12-3.el7.x86_64 ---> Package docker-ce-cli.x86_64 1:20.10.12-3.el7 will be installed --> Processing Dependency: docker-scan-plugin(x86-64) for package: 1:docker-ce-cli-20.10.12-3.el7.x86_64 --> Running transaction check ---> Package container-selinux.noarch 2:2.119.2-1.911c772.el7_8 will be installed ---> Package docker-ce-rootless-extras.x86_64 0:20.10.12-3.el7 will be installed --> Processing Dependency: fuse-overlayfs >= 0.7 for package: docker-ce-rootless-extras-20.10.12-3.el7.x86_64 --> Processing Dependency: slirp4netns >= 0.4 for package: docker-ce-rootless-extras-20.10.12-3.el7.x86_64 ---> Package docker-scan-plugin.x86_64 0:0.12.0-3.el7 will be installed --> Running transaction check ---> 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: containerd.io x86_64 1.4.13-3.1.el7 docker-ce-stable 28 M docker-ce x86_64 3:20.10.12-3.el7 docker-ce-stable 23 M docker-ce-cli x86_64 1:20.10.12-3.el7 docker-ce-stable 30 M Installing for dependencies: container-selinux noarch 2:2.119.2-1.911c772.el7_8 extras 40 k docker-ce-rootless-extras x86_64 20.10.12-3.el7 docker-ce-stable 8.0 M docker-scan-plugin x86_64 0.12.0-3.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 3 Packages (+6 Dependent packages) Total download size: 94 M Installed size: 381 M Is this ok [y/d/N]: y Downloading packages: (1/9): container-selinux-2.119.2-1.911c772.el7_8.noarch.rpm | 40 kB 00:00:00 warning: /var/cache/yum/x86_64/7/docker-ce-stable/packages/containerd.io-1.4.13-3.1.el7.x86_64.rpm: Header V4 RSA/SHA512 Signature, key ID 621e9f35: NOKEY Public key for containerd.io-1.4.13-3.1.el7.x86_64.rpm is not installed (2/9): containerd.io-1.4.13-3.1.el7.x86_64.rpm | 28 MB 00:00:01 (3/9): docker-ce-cli-20.10.12-3.el7.x86_64.rpm | 30 MB 00:00:01 (4/9): docker-ce-rootless-extras-20.10.12-3.el7.x86_64.rpm | 8.0 MB 00:00:00 (5/9): docker-ce-20.10.12-3.el7.x86_64.rpm | 23 MB 00:00:03 (6/9): fuse-overlayfs-0.7.2-6.el7_8.x86_64.rpm | 54 kB 00:00:00 (7/9): slirp4netns-0.4.3-4.el7_8.x86_64.rpm | 81 kB 00:00:00 (8/9): docker-scan-plugin-0.12.0-3.el7.x86_64.rpm | 3.7 MB 00:00:00 (9/9): fuse3-libs-3.6.1-4.el7.x86_64.rpm | 82 kB 00:00:00 -------------------------------------------------------------------------------------------------------------------------------------------- Total 22 MB/s | 94 MB 00:00:04 Retrieving key from https://download.docker.com/linux/centos/gpg Importing GPG key 0x621E9F35: Userid : "Docker Release (CE rpm) " 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 : docker-scan-plugin-0.12.0-3.el7.x86_64 1/9 Installing : 1:docker-ce-cli-20.10.12-3.el7.x86_64 2/9 Installing : 2:container-selinux-2.119.2-1.911c772.el7_8.noarch 3/9 Installing : containerd.io-1.4.13-3.1.el7.x86_64 4/9 Installing : slirp4netns-0.4.3-4.el7_8.x86_64 5/9 Installing : fuse3-libs-3.6.1-4.el7.x86_64 6/9 Installing : fuse-overlayfs-0.7.2-6.el7_8.x86_64 7/9 Installing : docker-ce-rootless-extras-20.10.12-3.el7.x86_64 8/9 Installing : 3:docker-ce-20.10.12-3.el7.x86_64 9/9 Verifying : containerd.io-1.4.13-3.1.el7.x86_64 1/9 Verifying : fuse3-libs-3.6.1-4.el7.x86_64 2/9 Verifying : 1:docker-ce-cli-20.10.12-3.el7.x86_64 3/9 Verifying : fuse-overlayfs-0.7.2-6.el7_8.x86_64 4/9 Verifying : docker-scan-plugin-0.12.0-3.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 : docker-ce-rootless-extras-20.10.12-3.el7.x86_64 8/9 Verifying : 3:docker-ce-20.10.12-3.el7.x86_64 9/9 Installed: containerd.io.x86_64 0:1.4.13-3.1.el7 docker-ce.x86_64 3:20.10.12-3.el7 docker-ce-cli.x86_64 1:20.10.12-3.el7 Dependency Installed: container-selinux.noarch 2:2.119.2-1.911c772.el7_8 docker-ce-rootless-extras.x86_64 0:20.10.12-3.el7 docker-scan-plugin.x86_64 0:0.12.0-3.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!
sudo systemctl enable docker
sudo systemctl start docker
sudo systemctl status docker
sudo usermod -aG docker $USER
newgrp docker
The expected ouput is
(jegan@tektutor.org$)>sudo systemctl enable docker
Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.
(jegan@tektutor.org$)>sudo systemctl start docker
(jegan@tektutor.org$)>sudo systemctl status docker
● docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
Active: active (running) since Sun 2022-03-06 19:23:50 PST; 9min ago
Docs: https://docs.docker.com
Main PID: 64145 (dockerd)
CGroup: /system.slice/docker.service
└─64145 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
Mar 06 19:23:48 tektutor.org dockerd[64145]: time="2022-03-06T19:23:48.110984142-08:00" level=info msg="ccResolverWrapper: sending...le=grpc
Mar 06 19:23:48 tektutor.org dockerd[64145]: time="2022-03-06T19:23:48.111009882-08:00" level=info msg="ClientConn switching balan...le=grpc
Mar 06 19:23:48 tektutor.org dockerd[64145]: time="2022-03-06T19:23:48.477701245-08:00" level=info msg="Loading containers: start."
Mar 06 19:23:49 tektutor.org dockerd[64145]: time="2022-03-06T19:23:49.915307132-08:00" level=info msg="Default bridge (docker0) i...ddress"
Mar 06 19:23:50 tektutor.org dockerd[64145]: time="2022-03-06T19:23:50.201200737-08:00" level=info msg="Firewalld: interface docke...urning"
Mar 06 19:23:50 tektutor.org dockerd[64145]: time="2022-03-06T19:23:50.462895927-08:00" level=info msg="Loading containers: done."
Mar 06 19:23:50 tektutor.org dockerd[64145]: time="2022-03-06T19:23:50.515173237-08:00" level=info msg="Docker daemon" commit=459d...0.10.12
Mar 06 19:23:50 tektutor.org dockerd[64145]: time="2022-03-06T19:23:50.515686639-08:00" level=info msg="Daemon has completed initialization"
Mar 06 19:23:50 tektutor.org systemd[1]: Started Docker Application Container Engine.
Mar 06 19:23:50 tektutor.org dockerd[64145]: time="2022-03-06T19:23:50.571898030-08:00" level=info msg="API listen on /var/run/docker.sock"
Hint: Some lines were ellipsized, use -l to show in full.
(jegan@tektutor.org$)>newgrp docker
docker images
The expected ouput is
(jegan@tektutor.org$)>docker images REPOSITORY TAG IMAGE ID CREATED SIZE (jegan@tektutor.org$)>
- automate what you do
- convert whatever services you manually provide into source code
- Configuration Management Tools
- Puppet
- Ansible
- Chef
- Salt/SaltStack
- Container Orchestration Tools
- Docker SWARM
- Google Kubernetes
- RedHat OpenShift
- CI/CD tools
- Jenkins(Opensource) or Cloudbees(Enterprise)
- Bamboo
- Team City
- Microsoft Team Foundation Server (TFS)
- Version Control Softwares
- CVS, Perforce, ClearCase
- GitHub
- GitLab
- Build Tools
- make, cmake, ant, maven, grade, etc.,
- are used by DevOps engineers ( System Administrators to automate software installation/configuration )
- manages containers
- it platforms that make your application Highly Available
- SRE