Introduction
This article will provide information about how to install podman in Linux CentOS 8. Actually, the installation exist in a running virtual server. The virtual server is using Linux CentOS 8 as its operating system. Furthermore, the virtual server is running in a VirtualBox application. The reference for installing docker in Linux CentOS 8 is in this link. It is an article with the title of ‘Install Docker and Manage it with Portainer on CENTOS 8 / RHEL 8’.
Docker Installation Step
So, there are several steps for installing docker. The following steps actually refers to the article with the title of ‘Install Docker and Manage it with Portainer on CENTOS 8 / RHEL 8’ in this link. But in this article, it will perform to execute it with a few output display of it. The steps are in the following sequence :
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Install a repository which is containing the docker packages. Actually, by default there are no docker packages available on CentOS 8 repositories. So, execute following command in the command line to enable Docker CE repository :
dnf config-manager --add-repo=https://download.docker.com/linux/centos/docker-ce.repo
The real execution exist in the following output :
[root@10 ~]# dnf config-manager --add-repo=https://download.docker.com/linux/centos/docker-ce.repo Adding repo from: https://download.docker.com/linux/centos/docker-ce.repo [root@10 ~]#
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The following after just install the docker tool by executing the following command pattern :
dnf install docker-ce --nobest -y
The execution using the above command exist as follows :
[root@10 ~]# dnf install docker-ce --nobest -y Docker CE Stable - x86_64 12 kB/s | 11 kB 00:00 Dependencies resolved. ======================================================================================================================== Package Arch Version Repository Size ========================================================================================================================Installing: docker-ce x86_64 3:20.10.5-3.el8 docker-ce-stable 27 M Installing dependencies: container-selinux noarch 2:2.155.0-1.module_el8.3.0+699+d61d9c41 appstream 51 k containerd.io x86_64 1.4.4-3.1.el8 docker-ce-stable 33 M docker-ce-cli x86_64 1:20.10.5-3.el8 docker-ce-stable 33 M docker-ce-rootless-extras x86_64 20.10.5-3.el8 docker-ce-stable 9.1 M fuse-common x86_64 3.2.1-12.el8 baseos 21 k fuse-overlayfs x86_64 1.3.0-2.module_el8.3.0+699+d61d9c41 appstream 72 k fuse3 x86_64 3.2.1-12.el8 baseos 50 k fuse3-libs x86_64 3.2.1-12.el8 baseos 94 k libcgroup x86_64 0.41-19.el8 baseos 70 k libslirp x86_64 4.3.1-1.module_el8.3.0+475+c50ce30b appstream 69 k slirp4netns x86_64 1.1.8-1.module_el8.3.0+699+d61d9c41 appstream 51 k Enabling module streams: container-tools rhel8 Transaction Summary ========================================================================================================================Install 12 Packages Total download size: 103 M Installed size: 425 M Downloading Packages: (1/12): fuse-overlayfs-1.3.0-2.module_el8.3.0+699+d61d9c41.x86_64.rpm 62 kB/s | 72 kB 00:01 (2/12): container-selinux-2.155.0-1.module_el8.3.0+699+d61d9c41.noarch.rpm 43 kB/s | 51 kB 00:01 (3/12): slirp4netns-1.1.8-1.module_el8.3.0+699+d61d9c41.x86_64.rpm 1.3 MB/s | 51 kB 00:00 (4/12): libslirp-4.3.1-1.module_el8.3.0+475+c50ce30b.x86_64.rpm 54 kB/s | 69 kB 00:01 (5/12): fuse-common-3.2.1-12.el8.x86_64.rpm 22 kB/s | 21 kB 00:00 (6/12): fuse3-libs-3.2.1-12.el8.x86_64.rpm 101 kB/s | 94 kB 00:00 (7/12): fuse3-3.2.1-12.el8.x86_64.rpm 49 kB/s | 50 kB 00:01 (8/12): libcgroup-0.41-19.el8.x86_64.rpm 945 kB/s | 70 kB 00:00 (9/12): docker-ce-20.10.5-3.el8.x86_64.rpm 360 kB/s | 27 MB 01:15 (10/12): docker-ce-rootless-extras-20.10.5-3.el8.x86_64.rpm 282 kB/s | 9.1 MB 00:33 (11/12): docker-ce-cli-20.10.5-3.el8.x86_64.rpm 309 kB/s | 33 MB 01:49 (12/12): containerd.io-1.4.4-3.1.el8.x86_64.rpm 299 kB/s | 33 MB 01:54 ------------------------------------------------------------------------------------------------------------------------Total 893 kB/s | 103 MB 01:57 warning: /var/cache/dnf/docker-ce-stable-fa9dc42ab4cec2f4/packages/containerd.io-1.4.4-3.1.el8.x86_64.rpm: Header V4 RSA/SHA512 Signature, key ID 621e9f35: NOKEY Docker CE Stable - x86_64 2.9 kB/s | 1.6 kB 00:00 Importing GPG key 0x621E9F35: Userid : "Docker Release (CE rpm) <docker@docker.com>" Fingerprint: 060A 61C5 1B55 8A7F 742B 77AA C52F EB6B 621E 9F35 From : https://download.docker.com/linux/centos/gpg Key imported successfully Running transaction check Transaction check succeeded. Running transaction test Transaction test succeeded. Running transaction Preparing : 1/1 Running scriptlet: container-selinux-2:2.155.0-1.module_el8.3.0+699+d61d9c41.noarch 1/12 Installing : container-selinux-2:2.155.0-1.module_el8.3.0+699+d61d9c41.noarch 1/12 Running scriptlet: container-selinux-2:2.155.0-1.module_el8.3.0+699+d61d9c41.noarch 1/12 Installing : containerd.io-1.4.4-3.1.el8.x86_64 2/12 Running scriptlet: containerd.io-1.4.4-3.1.el8.x86_64 2/12 Installing : docker-ce-cli-1:20.10.5-3.el8.x86_64 3/12 Running scriptlet: docker-ce-cli-1:20.10.5-3.el8.x86_64 3/12 Running scriptlet: libcgroup-0.41-19.el8.x86_64 4/12 Installing : libcgroup-0.41-19.el8.x86_64 4/12 Running scriptlet: libcgroup-0.41-19.el8.x86_64 4/12 Installing : fuse3-libs-3.2.1-12.el8.x86_64 5/12 Running scriptlet: fuse3-libs-3.2.1-12.el8.x86_64 5/12 Installing : fuse-common-3.2.1-12.el8.x86_64 6/12 Installing : fuse3-3.2.1-12.el8.x86_64 7/12 Installing : fuse-overlayfs-1.3.0-2.module_el8.3.0+699+d61d9c41.x86_64 8/12 Running scriptlet: fuse-overlayfs-1.3.0-2.module_el8.3.0+699+d61d9c41.x86_64 8/12 Installing : libslirp-4.3.1-1.module_el8.3.0+475+c50ce30b.x86_64 9/12 Installing : slirp4netns-1.1.8-1.module_el8.3.0+699+d61d9c41.x86_64 10/12 Installing : docker-ce-rootless-extras-20.10.5-3.el8.x86_64 11/12 Running scriptlet: docker-ce-rootless-extras-20.10.5-3.el8.x86_64 11/12 Installing : docker-ce-3:20.10.5-3.el8.x86_64 12/12 Running scriptlet: docker-ce-3:20.10.5-3.el8.x86_64 12/12 Running scriptlet: container-selinux-2:2.155.0-1.module_el8.3.0+699+d61d9c41.noarch 12/12 Running scriptlet: docker-ce-3:20.10.5-3.el8.x86_64 12/12 Verifying : container-selinux-2:2.155.0-1.module_el8.3.0+699+d61d9c41.noarch 1/12 Verifying : fuse-overlayfs-1.3.0-2.module_el8.3.0+699+d61d9c41.x86_64 2/12 Verifying : libslirp-4.3.1-1.module_el8.3.0+475+c50ce30b.x86_64 3/12 Verifying : slirp4netns-1.1.8-1.module_el8.3.0+699+d61d9c41.x86_64 4/12 Verifying : fuse-common-3.2.1-12.el8.x86_64 5/12 Verifying : fuse3-3.2.1-12.el8.x86_64 6/12 Verifying : fuse3-libs-3.2.1-12.el8.x86_64 7/12 Verifying : libcgroup-0.41-19.el8.x86_64 8/12 Verifying : containerd.io-1.4.4-3.1.el8.x86_64 9/12 Verifying : docker-ce-3:20.10.5-3.el8.x86_64 10/12 Verifying : docker-ce-cli-1:20.10.5-3.el8.x86_64 11/12 Verifying : docker-ce-rootless-extras-20.10.5-3.el8.x86_64 12/12 Installed: container-selinux-2:2.155.0-1.module_el8.3.0+699+d61d9c41.noarch containerd.io-1.4.4-3.1.el8.x86_64 docker-ce-3:20.10.5-3.el8.x86_64 docker-ce-cli-1:20.10.5-3.el8.x86_64 docker-ce-rootless-extras-20.10.5-3.el8.x86_64 fuse-common-3.2.1-12.el8.x86_64 fuse-overlayfs-1.3.0-2.module_el8.3.0+699+d61d9c41.x86_64 fuse3-3.2.1-12.el8.x86_64 fuse3-libs-3.2.1-12.el8.x86_64 libcgroup-0.41-19.el8.x86_64 libslirp-4.3.1-1.module_el8.3.0+475+c50ce30b.x86_64 slirp4netns-1.1.8-1.module_el8.3.0+699+d61d9c41.x86_64 Complete! [root@10 ~]#
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Soon after, start preparing the docker service as the execution of the following commands :
[root@10 ~]# systemctl start docker [root@10 ~]# systemctl enable docker Created symlink /etc/systemd/system/multi-user.target.wants/docker.service → /usr/lib/systemd/system/docker.service. [root@10 ~]# 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 Wed 2021-04-07 22:39:55 EDT; 9s ago Docs: https://docs.docker.com Main PID: 48641 (dockerd) Tasks: 8 Memory: 43.6M CGroup: /system.slice/docker.service └─48641 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock Apr 07 22:39:54 10.0.2.15 dockerd[48641]: time="2021-04-07T22:39:54.208717163-04:00" level=warning msg="Your kernel does not support cgroup blkio weight" Apr 07 22:39:54 10.0.2.15 dockerd[48641]: time="2021-04-07T22:39:54.208765774-04:00" level=warning msg="Your kernel does not support cgroup blkio weight_device" Apr 07 22:39:54 10.0.2.15 dockerd[48641]: time="2021-04-07T22:39:54.209150894-04:00" level=info msg="Loading containers: start." Apr 07 22:39:55 10.0.2.15 dockerd[48641]: time="2021-04-07T22:39:55.071169308-04:00" level=info msg="Default bridge (docker0) is assigned with an IP address 172.17.0.0/16.> Apr 07 22:39:55 10.0.2.15 dockerd[48641]: time="2021-04-07T22:39:55.402248397-04:00" level=info msg="Firewalld: interface docker0 already part of docker zone, returning" Apr 07 22:39:55 10.0.2.15 dockerd[48641]: time="2021-04-07T22:39:55.653789852-04:00" level=info msg="Loading containers: done." Apr 07 22:39:55 10.0.2.15 dockerd[48641]: time="2021-04-07T22:39:55.674155973-04:00" level=info msg="Docker daemon" commit=363e9a8 graphdriver(s)=overlay2 version=20.10.5 Apr 07 22:39:55 10.0.2.15 dockerd[48641]: time="2021-04-07T22:39:55.674277927-04:00" level=info msg="Daemon has completed initialization" Apr 07 22:39:55 10.0.2.15 systemd[1]: Started Docker Application Container Engine. Apr 07 22:39:55 10.0.2.15 dockerd[48641]: time="2021-04-07T22:39:55.713425886-04:00" level=info msg="API listen on /var/run/docker.sock" lines 1-20/20 (END) [root@10 ~]# -
Finally the docker service has started. But actually, given the state of the docker installation, it is not a standard requirement for starting the service before in order to run a container. Aside from that, the following is the execution of the command for running a container as an example in the command line :
[root@10 ~]# docker run hello-world Unable to find image 'hello-world:latest' locally latest: Pulling from library/hello-world b8dfde127a29: Pull complete Digest: sha256:308866a43596e83578c7dfa15e27a73011bdd402185a84c5cd7f32a88b501a24 Status: Downloaded newer image for hello-world:latest Hello from Docker! This message shows that your installation appears to be working correctly. To generate this message, Docker took the following steps: 1. The Docker client contacted the Docker daemon. 2. The Docker daemon pulled the "hello-world" image from the Docker Hub. (amd64) 3. The Docker daemon created a new container from that image which runs the executable that produces the output you are currently reading. 4. The Docker daemon streamed that output to the Docker client, which sent it to your terminal. To try something more ambitious, you can run an Ubuntu container with: $ docker run -it ubuntu bash Share images, automate workflows, and more with a free Docker ID: https://hub.docker.com/ For more examples and ideas, visit: https://docs.docker.com/get-started/ [root@10 ~]#