Podman vs Docker on CentOS 8
Daniel Nashed 2 November 2020 10:17:21
As posted earlier it isn't that easy to get the current Docker 19 version installed on CentOS 8, because RedHat is shipping an older containerd.io with CentOS 8 than on CentOS7.
Podman (https://podman.io/getting-started/) becomes more and more interesting and also since a couple of releases supports integration with K8s / OpenShift.
It's no secret that RedHat is in favor of Podman. They don't ship the latest version. And Podman recommends using the one shipped with CentOS 8 -- currently 1.6.4.
There are newer versions available. And I think the way podman allows you to use K8s files instead of what docker-compose is doing, will be a great bridge between podman and K8s / OpenShift environments.
Using the podman play command you can use the K8s pod definitions.Thats better than using docker-compose.yml with Docker Compose.
https://www.redhat.com/sysadmin/compose-podman-pods
And there is also a new podman play kube command since podman v2.0 which looks promising -> https://www.redhat.com/sysadmin/podman-play-kube
I just installed the most recent podman version 2.1.1 on a CentOS 8.2 machine and will do some testing.
But it really sounds like Docker will have challenges keeping up with Podman is doing.
And I would also say that Podman is already ahead! I will spend more time looking into Podman.
The Domino Docker Open Source community project already supports Podman for a while as a build and run-time environment along with K8s and OpenShift support
--> https://github.com/IBM/domino-docker/blob/master/docs/supported-environments.md
HCL doesn't officially support Podman today -- but it works. If you are runnng the Domino V12 Early Access Code Drop and you are running with CentOS 8.x, my preference would be Podman!
Podman uses the same syntax that Docker uses. I am always using the Podman commands natively. But there is also a compatiblity mode, where Podman supports the Docker commands almost 1:1.
-- Daniel
sudo yum install podman
Last metadata expiration check: 1:12:51 ago on Mon 02 Nov 2020 09:32:11 AM CET.
Dependencies resolved.
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Package Architecture Version Repository Size
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Installing:
podman x86_64 1.6.4-10.module_el8.2.0+305+5e198a41 AppStream 12 M
Installing dependencies:
conmon x86_64 2:2.0.6-1.module_el8.2.0+305+5e198a41 AppStream 37 k
containernetworking-plugins x86_64 0.8.3-5.module_el8.2.0+305+5e198a41 AppStream 20 M
containers-common x86_64 1:0.1.40-11.module_el8.2.0+377+92552693 AppStream 50 k
dnf-plugin-subscription-manager x86_64 1.26.20-1.el8_2 BaseOS 278 k
fuse-overlayfs x86_64 0.7.2-5.module_el8.2.0+305+5e198a41 AppStream 60 k
fuse3-libs x86_64 3.2.1-12.el8 BaseOS 94 k
libvarlink x86_64 18-3.el8 BaseOS 44 k
python3-ethtool x86_64 0.14-3.el8 BaseOS 45 k
python3-iniparse noarch 0.4-31.el8 BaseOS 49 k
python3-inotify noarch 0.9.6-13.el8 BaseOS 57 k
python3-subscription-manager-rhsm x86_64 1.26.20-1.el8_2 BaseOS 348 k
slirp4netns x86_64 0.4.2-3.git21fdece.module_el8.2.0+305+5e198a41 AppStream 88 k
subscription-manager-rhsm-certificates x86_64 1.26.20-1.el8_2 BaseOS 247 k
usermode x86_64 1.113-1.el8 BaseOS 202 k
Installing weak dependencies:
subscription-manager x86_64 1.26.20-1.el8_2 BaseOS 1.1 M
Transaction Summary
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Install 16 Packages
Total download size: 35 M
Installed size: 132 M
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