mirror of
https://pagure.io/fedora-docs/quick-docs.git
synced 2024-11-24 13:32:42 +00:00
ee8c798dc3
Adds section on how to use drop-in directory to modify cri-o configuration that will persist across version updates.
36 lines
2.8 KiB
Text
36 lines
2.8 KiB
Text
= Versioned CRI-O and CRI-Tools RPMs
|
|
Bradley G Smith,
|
|
:revnumber: F41
|
|
:revdate: 2024-07-30
|
|
:category: Installation
|
|
:tags: How-to, kubernetes, dnf, rpm, containers, cri-o, cri-tools
|
|
|
|
// Optional free form useful additional information as comment
|
|
|
|
//include::{partialsdir}/3rdparty-message.adoc[]
|
|
include::partial$3rdparty-message.adoc[]
|
|
|
|
[[sect-overview]]
|
|
== Overview
|
|
|
|
link:https://cri-o.io[CRI-O] and link:https://github.com/kubernetes-sigs/cri-tools[CRI-Tools] are independent software packages available in Fedora repositories that are version matched to Kubernetes. If Kubernetes 1.30 is installed, then, when installed, CRI-O and CRI-Tools should also have the same minor version, _i.e_ 1.30.
|
|
|
|
[[sect-cri-o]]
|
|
== CRI-O
|
|
|
|
The **C**ontainer **R**untime **I**nterface(link:https://kubernetes.io/docs/concepts/architecture/cri/[CRI]) is the plugin interface used by the ```kubelet``` to communicate with the container runtime on each node that launches pods and their containers. There are several implementations of CRI including link:https://cri-o.io[CRI-O] and link://https://containerd.io/[containerd].
|
|
|
|
CRI-O is available in Fedora repositories as versioned rpms in parallel with Kubernetes. If kubernetes1.30 is installed and CRI-O is the designated CRI implementation, then cri-o1.30 needs to be installed.
|
|
|
|
=== Configuration
|
|
|
|
CRI-O configuration options are set in `/etc/crio/crio.conf`. This file is managed by rpm and therefore replaced when a versioned CRI-O package is replaced by another package (not counting patch level updates) such as when the cri-o1.30 rpm is replaced by the cri-o1.31 rpm. One method to create and manage custom CRI-O conifiguration settings that persist across updates is to take advantage of CRI-O support for a drop-in configuration. The default drop-in subdirectory is `/etc/crio/crio.conf.d/`. Settings in configuration files placed in the drop-in directory take precedence over the same setting in the default configuration file `/etc/crio/crio.conf`. If multiple drop-in configuration files have the same setting, the file that is sorted last in lexical order will have precedence. See link:https://github.com/cri-o/cri-o/blob/main/docs/crio.conf.d.5.md[crio.conf.d] man file for additional information.
|
|
|
|
See xref:using-kubernetes-kubelet.adoc[Resilient kubelet configuration] for related `kublet` configuration options.
|
|
|
|
[[sect-cri-tools]]
|
|
== CRI-Tools
|
|
|
|
link:https://github.com/kubernetes-sigs/cri-tools/[CRI-Tools] is a command line interface to any implementation of the CLI. CRI-Tools is available from the Kubernetes team. It is required when using ```kubeadm``` to initialize a cluster.
|
|
|
|
CRI-Tools is available in Fedora repositories as versioned rpms in parallel with Kubernetes. If kubernetes1.30 and kubernetes1.30-kubeadm are installed then cri-tools1.30 needs to be installed.
|