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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
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Bradley G Smith,
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:revnumber: F41
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:revdate: 2024-07-30
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:category: Installation
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:tags: How-to, kubernetes, dnf, rpm, containers, cri-o, cri-tools
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// Optional free form useful additional information as comment
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//include::{partialsdir}/3rdparty-message.adoc[]
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include::partial$3rdparty-message.adoc[]
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[[sect-overview]]
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== Overview
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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.
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[[sect-cri-o]]
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== CRI-O
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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].
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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.
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=== Configuration
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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.
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See xref:using-kubernetes-kubelet.adoc[Resilient kubelet configuration] for related `kublet` configuration options.
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[[sect-cri-tools]]
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== CRI-Tools
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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.
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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.
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