Podman vs Cri-o ?
Hi Everybody,
I am a little bit confused regarding the difference/relation between Podman and Cri-o.
As far as I could understand : Podman is a replacement for Docker, Cri-o is also intended to be a replacement to docker, but it's still marked "work in progress" as the course says. That makes sense so far.
But in the 3.2 lab when configuring a local repository to host images, We need to do sudo systemctl restart crio
why not restart Podman instead, how Cri-o is used here in combination with Podman ?
Thank you for your help,
Answers
-
Hi @elmoussaoui,
Podman is a daemonless, open source containerization tool used in lab exercises as a replacement for Docker. Operations to build container images, tag images, pull/push to and from registries, and run containers are performed with Podman. However, since it is daemonless (as opposed to Docker that relies on the docker daemon - dockerd), it does not need a restart.
Cri-o is one of the container runtimes that Kubernetes can use to run and manage containers. It runs as daemon, therefore it needs a restart after configuration changes. While Docker was a preferred runtime for Kubernetes, its complex set of tools are not required by Kubernetes to run containers, one of the reasons why cri-o or conainerd are used in many recent Kubernetes cluster deployments.
Regards,
-Chris0 -
Hi @chrispokorni ,
Thanks for answering,So basically Kubernetes is using the combination CRI-O (as a container runtime) + Podman(for build, tag, pull images ..) as a replacement for Docker which was doing all of this , is that correct ? is this only an intermediate phase waiting that the dev of CRI-O finishes, or it will be always like this ?
Regards,
0 -
Hi @elmoussaoui,
Kubernetes uses cri-o as runtime for containers, while developers use Podman or Docker to build container images, run containers, pull/push images, etc...
Kubernetes' support of the Docker runtime is expected to end with the removal of the dockershim from Kubernetes in release v1.24. As a result other runtimes such as cri-o or containerd will be used with Kubernetes to replace Docker, and the labs are reflecting that by introducing cri-o as runtime.
Read more - Dockershim deprecation FAQ
Regards,
-Chris0 -
@chrispokorni Thank makes sense now.
Thanks for the clarification0
Categories
- All Categories
- 207 LFX Mentorship
- 207 LFX Mentorship: Linux Kernel
- 735 Linux Foundation IT Professional Programs
- 339 Cloud Engineer IT Professional Program
- 167 Advanced Cloud Engineer IT Professional Program
- 66 DevOps Engineer IT Professional Program
- 132 Cloud Native Developer IT Professional Program
- 122 Express Training Courses
- 122 Express Courses - Discussion Forum
- 5.9K Training Courses
- 40 LFC110 Class Forum - Discontinued
- 66 LFC131 Class Forum
- 39 LFD102 Class Forum
- 221 LFD103 Class Forum
- 17 LFD110 Class Forum
- 33 LFD121 Class Forum
- 17 LFD133 Class Forum
- 6 LFD134 Class Forum
- 17 LFD137 Class Forum
- 70 LFD201 Class Forum
- 3 LFD210 Class Forum
- 2 LFD210-CN Class Forum
- 2 LFD213 Class Forum - Discontinued
- 128 LFD232 Class Forum - Discontinued
- 1 LFD233 Class Forum
- 3 LFD237 Class Forum
- 23 LFD254 Class Forum
- 689 LFD259 Class Forum
- 109 LFD272 Class Forum
- 3 LFD272-JP クラス フォーラム
- 10 LFD273 Class Forum
- 109 LFS101 Class Forum
- LFS111 Class Forum
- 2 LFS112 Class Forum
- 1 LFS116 Class Forum
- 3 LFS118 Class Forum
- 3 LFS142 Class Forum
- 3 LFS144 Class Forum
- 3 LFS145 Class Forum
- 1 LFS146 Class Forum
- 2 LFS147 Class Forum
- 8 LFS151 Class Forum
- 1 LFS157 Class Forum
- 14 LFS158 Class Forum
- 5 LFS162 Class Forum
- 1 LFS166 Class Forum
- 3 LFS167 Class Forum
- 1 LFS170 Class Forum
- 1 LFS171 Class Forum
- 2 LFS178 Class Forum
- 2 LFS180 Class Forum
- 1 LFS182 Class Forum
- 4 LFS183 Class Forum
- 30 LFS200 Class Forum
- 737 LFS201 Class Forum - Discontinued
- 2 LFS201-JP クラス フォーラム
- 17 LFS203 Class Forum
- 117 LFS207 Class Forum
- 1 LFS207-DE-Klassenforum
- LFS207-JP クラス フォーラム
- 301 LFS211 Class Forum
- 55 LFS216 Class Forum
- 50 LFS241 Class Forum
- 43 LFS242 Class Forum
- 37 LFS243 Class Forum
- 13 LFS244 Class Forum
- 1 LFS245 Class Forum
- 45 LFS250 Class Forum
- 1 LFS250-JP クラス フォーラム
- LFS251 Class Forum
- 145 LFS253 Class Forum
- LFS254 Class Forum
- LFS255 Class Forum
- 6 LFS256 Class Forum
- LFS257 Class Forum
- 1.2K LFS258 Class Forum
- 9 LFS258-JP クラス フォーラム
- 116 LFS260 Class Forum
- 155 LFS261 Class Forum
- 41 LFS262 Class Forum
- 82 LFS263 Class Forum - Discontinued
- 15 LFS264 Class Forum - Discontinued
- 11 LFS266 Class Forum - Discontinued
- 23 LFS267 Class Forum
- 18 LFS268 Class Forum
- 29 LFS269 Class Forum
- 200 LFS272 Class Forum
- 1 LFS272-JP クラス フォーラム
- LFS274 Class Forum
- 3 LFS281 Class Forum
- 7 LFW111 Class Forum
- 257 LFW211 Class Forum
- 178 LFW212 Class Forum
- 12 SKF100 Class Forum
- SKF200 Class Forum
- 791 Hardware
- 199 Drivers
- 68 I/O Devices
- 37 Monitors
- 98 Multimedia
- 174 Networking
- 91 Printers & Scanners
- 85 Storage
- 754 Linux Distributions
- 82 Debian
- 67 Fedora
- 16 Linux Mint
- 13 Mageia
- 23 openSUSE
- 147 Red Hat Enterprise
- 31 Slackware
- 13 SUSE Enterprise
- 351 Ubuntu
- 465 Linux System Administration
- 39 Cloud Computing
- 71 Command Line/Scripting
- Github systems admin projects
- 91 Linux Security
- 78 Network Management
- 101 System Management
- 47 Web Management
- 56 Mobile Computing
- 17 Android
- 28 Development
- 1.2K New to Linux
- 1K Getting Started with Linux
- 366 Off Topic
- 114 Introductions
- 171 Small Talk
- 20 Study Material
- 534 Programming and Development
- 293 Kernel Development
- 223 Software Development
- 1.1K Software
- 212 Applications
- 182 Command Line
- 3 Compiling/Installing
- 405 Games
- 311 Installation
- 79 All In Program
- 79 All In Forum
Upcoming Training
-
August 20, 2018
Kubernetes Administration (LFS458)
-
August 20, 2018
Linux System Administration (LFS301)
-
August 27, 2018
Open Source Virtualization (LFS462)
-
August 27, 2018
Linux Kernel Debugging and Security (LFD440)