CRI-O Installation Instructions

This guide will walk you through the installation of CRI-O, an Open Container Initiative-based implementation of the Kubernetes Container Runtime Interface. It is assumed you are running a Linux machine.

Install packaged versions of CRI-O

CRI-O builds for native package managers using openSUSE's OBS

Supported versions

CRI-O follows the Kubernetes support cycle of three minor releases. CRI-O also attempts to package for the following operating systems:

Fedora 31+
openSUSE
CentOS 8
CentOS 8 Stream
CentOS 7
Debian Unstable
Debian Testing
Debian 10
Debian 11
Rasbian 10
xUbuntu 22.04
xUbuntu 21.10
xUbuntu 20.04
xUbuntu 18.04

To install, choose a supported version for your operating system, and export it as a variable, like so: export VERSION=1.19

We also save releases as subprojects. If you'd, for instance, like to use 1.19.1 you can set export VERSION=1.19:1.19.1

Packaging for CRI-O is done best-effort, and is largely driven by requests. If there's a version or operating system that is missing, please open an issue.

Installation Instructions

openSUSE

sudo zypper install cri-o

Fedora 31 or later

sudo dnf module enable cri-o:$VERSION
sudo dnf install cri-o

For Fedora, we only support setting minor versions. i.e: VERSION=1.18, and do not support pinning patch versions: VERSION=1.18.3

Note: as of 1.24.0, the cri-o package no longer depends on containernetworking-plugins package. Removing this dependency allows users to install their own CNI plugins without having to remove files first. If users want to use the previously provided CNI plugins, they should also run:

sudo dnf install containernetworking-plugins

Other yum based operating systems

To install on the following operating systems, set the environment variable $OS to the appropriate value from the following table:

Operating system	$OS
Centos 8	`CentOS_8`
Centos 8 Stream	`CentOS_8_Stream`
Centos 7	`CentOS_7`

And then run the following as root:

curl -L -o /etc/yum.repos.d/devel:kubic:libcontainers:stable.repo https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/devel:kubic:libcontainers:stable.repo
curl -L -o /etc/yum.repos.d/devel:kubic:libcontainers:stable:cri-o:$VERSION.repo https://download.opensuse.org/repositories/devel:kubic:libcontainers:stable:cri-o:$VERSION/$OS/devel:kubic:libcontainers:stable:cri-o:$VERSION.repo
yum install cri-o

Note: as of 1.24.0, the cri-o package no longer depends on containernetworking-plugins package. Removing this dependency allows users to install their own CNI plugins without having to remove files first. If users want to use the previously provided CNI plugins, they should also run:

yum install containernetworking-plugins

APT based operating systems

Note: this tutorial assumes you have curl and gnupg installed

To install on the following operating systems, set the environment variable $OS to the appropriate value from the following table:

Operating system	$OS
Debian Unstable	`Debian_Unstable`
Debian Testing	`Debian_Testing`
Debian 11	`Debian_11`
Debian 10	`Debian_10`
Raspberry Pi OS	`Raspbian_10`
Ubuntu 22.04	`xUbuntu_22.04`
Ubuntu 21.10	`xUbuntu_21.10`
Ubuntu 21.04	`xUbuntu_21.04`
Ubuntu 20.10	`xUbuntu_20.10`
Ubuntu 20.04	`xUbuntu_20.04`
Ubuntu 18.04	`xUbuntu_18.04`

If installing cri-o-runc (recommended), you'll need to install libseccomp >= 2.4.1. NOTE: This is not available in distros based on Debian 10(buster) or below, so buster backports will need to be enabled:

echo 'deb http://deb.debian.org/debian buster-backports main' > /etc/apt/sources.list.d/backports.list
apt update
apt install -y -t buster-backports libseccomp2 || apt update -y -t buster-backports libseccomp2

And then run the following as root:

echo "deb [signed-by=/usr/share/keyrings/libcontainers-archive-keyring.gpg] https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/ /" > /etc/apt/sources.list.d/devel:kubic:libcontainers:stable.list
echo "deb [signed-by=/usr/share/keyrings/libcontainers-crio-archive-keyring.gpg] https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable:/cri-o:/$VERSION/$OS/ /" > /etc/apt/sources.list.d/devel:kubic:libcontainers:stable:cri-o:$VERSION.list

mkdir -p /usr/share/keyrings
curl -L https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/Release.key | gpg --dearmor -o /usr/share/keyrings/libcontainers-archive-keyring.gpg
curl -L https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable:/cri-o:/$VERSION/$OS/Release.key | gpg --dearmor -o /usr/share/keyrings/libcontainers-crio-archive-keyring.gpg

apt-get update
apt-get install cri-o cri-o-runc

Note: We include cri-o-runc because Ubuntu and Debian include their own packaged version of runc. While this version should work with CRI-O, keeping the packaged versions of CRI-O and runc in sync ensures they work together. If you'd like to use the distribution's runc, you'll have to add the file:

[crio.runtime.runtimes.runc]
runtime_path = ""
runtime_type = "oci"
runtime_root = "/run/runc"

to /etc/crio/crio.conf.d/

Note: as of 1.24.0, the cri-o package no longer depends on containernetworking-plugins package. Removing this dependency allows users to install their own CNI plugins without having to remove files first. If users want to use the previously provided CNI plugins, they should also run:

apt-get install containernetworking-plugins

Build and install CRI-O from source

Runtime dependencies

runc, Clear Containers runtime, or any other OCI compatible runtime
iproute
iptables

Latest version of runc is expected to be installed on the system. It is picked up as the default runtime by CRI-O.

Build and Run Dependencies

Fedora - RHEL 7 - CentOS

Required

Fedora, RHEL 7, CentOS and related distributions:

yum install -y \
  containers-common \
  device-mapper-devel \
  git \
  glib2-devel \
  glibc-devel \
  glibc-static \
  go \
  gpgme-devel \
  libassuan-devel \
  libgpg-error-devel \
  libseccomp-devel \
  libselinux-devel \
  pkgconfig \
  make \
  runc

Please note:

CentOS 8 (or higher): pkgconfig package is replaced by pkgconf-pkg-config
By default btrfs is not enabled. To add the btrfs support, install the following package: btrfs-progs-devel
It is possible the distribution packaged version of runc is out of date.
If you'd like to get the latest and greatest runc, consider using the one found in devel:kubic:libcontainers:stable

RHEL 8

For RHEL 8 distributions (tested on RHEL 8.5).

Make sure you are subscribed to the following repositories:

BaseOS/x86_64
Appstream/x86_64
CodeReady Linux Builder for x86_64

subscription-manager repos --enable=rhel-8-for-x86_64-baseos-rpms
subscription-manager repos --enable=rhel-8-for-x86_64-appstream-rpms
subscription-manager repos --enable=codeready-builder-for-rhel-8-x86_64-rpms

Follow this guide to subscribe to the repositories if not already subscribed.

This requires Go version 1.18 or greater. Follow these instructions to install Go

Install dependencies:

yum install -y \
  containers-common \
  device-mapper-devel \
  git \
  make \
  glib2-devel \
  glibc-devel \
  glibc-static \
  runc

Install go-md2man:

go get github.com/cpuguy83/go-md2man

Install dependencies:

yum install -y \
  libassuan \
  libassuan-devel \
  libgpg-error \
  libseccomp \
  libselinux \
  pkgconf-pkg-config \
  gpgme-devel

Debian - Raspbian - Ubuntu

On Debian, Raspbian and Ubuntu distributions, enable the Kubic project repositories (for containers-common and cri-o-runc packages) and install the following packages:

Debian up to buster - Raspbian - Ubuntu up to 18.04

apt update -qq && \
# For Debian 10(buster) or below: use "apt install -t buster-backports"
apt install -y  \
  btrfs-tools \
  containers-common \
  git \
  golang-go \
  libassuan-dev \
  libdevmapper-dev \
  libglib2.0-dev \
  libc6-dev \
  libgpgme11-dev \
  libgpg-error-dev \
  libseccomp-dev \
  libsystemd-dev \
  libbtrfs-dev \
  libselinux1-dev \
  pkg-config \
  go-md2man \
  cri-o-runc \
  libudev-dev \
  software-properties-common \
  gcc \
  make

Debian bullseye or higher - Ubuntu 20.04 or higher

apt-get update -qq && apt-get install -y \
  libbtrfs-dev \
  containers-common \
  git \
  golang-go \
  libassuan-dev \
  libdevmapper-dev \
  libglib2.0-dev \
  libc6-dev \
  libgpgme-dev \
  libgpg-error-dev \
  libseccomp-dev \
  libsystemd-dev \
  libselinux1-dev \
  pkg-config \
  go-md2man \
  cri-o-runc \
  libudev-dev \
  software-properties-common \
  gcc \
  make

Caveats and Notes:

If using an older release or a long-term support release, be careful to double-check that the version of runc is new enough (running runc --version should produce spec: 1.0.0 or greater), or else build your own.

Be careful to double-check that the version of golang is new enough, version 1.12.x or higher is required. If needed, newer golang versions are available at the official download website.

Get Source Code

Clone the source code using:

git clone https://github.com/cri-o/cri-o # or your fork
cd cri-o

Make sure your CRI-O and kubernetes versions are of matching major versions. For instance, if you want to be compatible with the latest kubernetes release, you'll need to use the latest tagged release of CRI-O on branch release-1.18.

Build

To install with default buildtags using seccomp, use:

make
sudo make install

Otherwise, if you do not want to build CRI-O with seccomp support you can add BUILDTAGS="" when running make.

make BUILDTAGS=""
sudo make install

Install with Ansible

An Ansible Role is also available to automate the above steps:

sudo su -
mkdir -p ~/.ansible/roles
cd ~/.ansible/roles
git clone https://github.com/alvistack/ansible-role-cri_o.git cri_o
cd ~/.ansible/roles/cri_o
pip3 install --upgrade --ignore-installed --requirement requirements.txt
molecule converge
molecule verify

Build Tags

CRI-O supports optional build tags for compiling support of various features. To add build tags to the make option the BUILDTAGS variable must be set.

make BUILDTAGS='seccomp apparmor'

Build Tag	Feature	Dependency
seccomp	syscall filtering	libseccomp
selinux	selinux process and mount labeling	libselinux
apparmor	apparmor profile support

CRI-O manages images with containers/image, which uses the following buildtags.

Build Tag	Feature	Dependency
containers_image_openpgp	use native golang pgp instead of cgo
containers_image_ostree_stub	disable use of ostree as an image transport

CRI-O also uses containers/storage for managing container storage.

Build Tag	Feature	Dependency
exclude_graphdriver_btrfs	exclude btrfs as a storage option
btrfs_noversion	for building btrfs version < 3.16.1	btrfs
exclude_graphdriver_devicemapper	exclude devicemapper as a storage option
libdm_no_deferred_remove	don't compile deferred remove with devicemapper	devicemapper
exclude_graphdriver_overlay	exclude overlay as a storage option
ostree	build storage using ostree	ostree

Static builds

It is possible to build a statically linked binary of CRI-O by using the officially provided nix package and the derivation of it within this repository. The builds are completely reproducible and will create a x86_64/amd64 or aarch64/arm64 or ppc64le stripped ELF binary for glibc. These binaries are integration tested as well and support the following features:

apparmor
btrfs
device mapper
gpgme
seccomp
selinux

To build the binaries locally either install the nix package manager or use the make build-static target which relies on the nixos/nix container image.

The overall build process can take a tremendous amount of CPU time depending on the hardware. The resulting binaries should now be available within:

bin/static/crio

To build the binaries without any prepared container and via the already installed nix package manager, simply run the following command from the root directory of this repository:

nix build -f nix

The resulting binaries should be now available in result/bin. To build the arm variant of the binaries, just run:

nix build -f nix/default-arm64.nix

Similarly, the ppc64le variant of binaries can be built using:

nix build -f nix/default-ppc64le.nix

Creating a release archive

A release bundle consists of all static binaries, the man pages and configuration files like 00-default.conf. The release-bundle target can be used to build a new release archive within the current repository:

make release-bundle
…
Created ./bundle/cri-o.amd64.v1.20.0.tar.gz

Download conmon

conmon is a per-container daemon that CRI-O uses to monitor container logs and exit information. conmon needs to be downloaded with CRI-O.

running:

git clone https://github.com/containers/conmon
cd conmon
make
sudo make install

will download conmon to your $PATH.

Setup CNI networking

A proper description of setting up CNI networking is given in the contrib/cni README. But the gist is that you need to have some basic network configurations enabled and CNI plugins installed on your system.

CRI-O configuration

If you are installing for the first time, generate and install configuration files with:

sudo make install.config

Validate registries in registries.conf

Edit /etc/containers/registries.conf and verify that the registries option has valid values in it. For example:

[registries.search]
registries = ['registry.access.redhat.com', 'registry.fedoraproject.org', 'quay.io', 'docker.io']

[registries.insecure]
registries = []

[registries.block]
registries = []

For more information about this file see registries.conf(5).

Optional - Modify verbosity of logs

Users can modify the log_level by specifying an overwrite like /etc/crio/crio.conf.d/01-log-level.conf to change the verbosity of the logs. Options are fatal, panic, error, warn, info (default), debug and trace.

[crio.runtime]
log_level = "info"

Optional - Modify capabilities and sysctls

By default, CRI-O uses the following capabilities:

default_capabilities = [
  "CHOWN",
  "DAC_OVERRIDE",
  "FSETID",
  "FOWNER",
  "SETGID",
  "SETUID",
  "SETPCAP",
  "NET_BIND_SERVICE",
  "KILL",
]

and no sysctls

default_sysctls = [
]

Users can change either default by adding overwrites to /etc/crio/crio.conf.d.

Starting CRI-O

Running make install will download CRI-O into the folder

/usr/local/bin/crio

You can run it manually there, or you can set up a systemd unit file with:

sudo make install.systemd

And let systemd take care of running CRI-O:

sudo systemctl daemon-reload
sudo systemctl enable crio
sudo systemctl start crio

Using CRI-O

Follow this tutorial to quickly get started running simple pods and containers.
To run a full cluster, see the instructions.
To run with kubeadm, see kubeadm instructions.

Updating CRI-O

openSUSE

sudo zypper update
sudo zypper update cri-o

Fedora 31 or later

sudo dnf update
sudo dnf update cri-o

Other yum based operating systems

sudo yum update
sudo yum update cri-o

APT based operating systems

If updating to a patch version (for example, VERSION=1.8.3 ), run

apt update cri-o cri-o-runc

Otherwise, be sure that the environment variable $OS is set to the appropriate value from the following table for your operating system. To install on the following operating systems, set the environment variable $OS to the appropriate value from the following table:

Operating system	$OS
Debian Unstable	`Debian_Unstable`
Debian Testing	`Debian_Testing`
Debian 11	`Debian_11`
Debian 10	`Debian_10`
Ubuntu 22.04	`xUbuntu_22.04`
Ubuntu 21.10	`xUbuntu_21.10`
Ubuntu 21.04	`xUbuntu_21.04`
Ubuntu 20.10	`xUbuntu_20.10`
Ubuntu 20.04	`xUbuntu_20.04`
Ubuntu 18.04	`xUbuntu_18.04`

To upgrade, choose a supported version for your operating system, and export it as a variable, like so: export VERSION=1.18, and run the following as root

rm /etc/apt/sources.list.d/devel:kubic:libcontainers:stable:cri-o:$VERSION.list

echo "deb http://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable:/cri-o:/$VERSION/$OS/ /" > /etc/apt/sources.list.d/devel:kubic:libcontainers:stable:cri-o:$VERSION.list

curl -L https://download.opensuse.org/repositories/devel:kubic:libcontainers:stable:cri-o:$VERSION/$OS/Release.key | apt-key add -

apt update
apt install cri-o cri-o-runc

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CRI-O Installation Instructions

Table of Contents

Install packaged versions of CRI-O

Supported versions

Installation Instructions

openSUSE

Fedora 31 or later

Other yum based operating systems

APT based operating systems

Build and install CRI-O from source

Runtime dependencies

Build and Run Dependencies

Fedora - RHEL 7 - CentOS

Required

RHEL 8

Debian - Raspbian - Ubuntu

Debian up to buster - Raspbian - Ubuntu up to 18.04

Debian bullseye or higher - Ubuntu 20.04 or higher

Get Source Code

Build

Install with Ansible

Build Tags

Static builds

Creating a release archive

Download conmon

Setup CNI networking

CRI-O configuration

Validate registries in registries.conf

Optional - Modify verbosity of logs

Optional - Modify capabilities and sysctls

Starting CRI-O

Using CRI-O

Updating CRI-O

openSUSE

Fedora 31 or later

Other yum based operating systems

APT based operating systems