website/content/en/docs/setup/cri.md

reviewers	title	content_template	weight
vincepri bart0sh	CRI installation	templates/concept	100

{{% capture overview %}} Since v1.6.0, Kubernetes has enabled the use of CRI, Container Runtime Interface, by default. This page contains installation instruction for various runtimes.

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Please proceed with executing the following commands based on your OS as root. You may become the root user by executing sudo -i after SSH-ing to each host.

Docker

On each of your machines, install Docker. Version 18.06 is recommended, but 1.11, 1.12, 1.13 and 17.03 are known to work as well. Keep track of the latest verified Docker version in the Kubernetes release notes.

Use the following commands to install Docker on your system:

{{< tabs name="tab-cri-docker-installation" >}} {{< tab name="Ubuntu 16.04" codelang="bash" >}}

Install Docker CE

Set up the repository:

Update the apt package index

apt-get update

Install packages to allow apt to use a repository over HTTPS

apt-get update && apt-get install apt-transport-https ca-certificates curl software-properties-common

Add Docker’s official GPG key

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -

Add docker apt repository.

add-apt-repository \
"deb [arch=amd64] https://download.docker.com/linux/ubuntu \
$(lsb_release -cs) \
stable"

Install docker ce.

apt-get update && apt-get install docker-ce=18.06.0~ce~3-0~ubuntu

Setup daemon.

cat > /etc/docker/daemon.json <<EOF { "exec-opts": ["native.cgroupdriver=systemd"], "log-driver": "json-file", "log-opts": { "max-size": "100m" }, "storage-driver": "overlay2" } EOF

mkdir -p /etc/systemd/system/docker.service.d

Restart docker.

systemctl daemon-reload systemctl restart docker {{< /tab >}} {{< tab name="CentOS/RHEL 7.4+" codelang="bash" >}}

Install Docker CE

Set up the repository

Install required packages.

yum install yum-utils device-mapper-persistent-data lvm2

Add docker repository.

yum-config-manager
--add-repo
https://download.docker.com/linux/centos/docker-ce.repo

Install docker ce.

yum update && yum install docker-ce-18.06.1.ce

Create /etc/docker directory.

mkdir /etc/docker

Setup daemon.

cat > /etc/docker/daemon.json <<EOF { "exec-opts": ["native.cgroupdriver=systemd"], "log-driver": "json-file", "log-opts": { "max-size": "100m" }, "storage-driver": "overlay2", "storage-opts": [ "overlay2.override_kernel_check=true" ] } EOF

mkdir -p /etc/systemd/system/docker.service.d

Restart docker.

systemctl daemon-reload systemctl restart docker {{< /tab >}} {{< /tabs >}}

Refer to the official Docker installation guides for more information.

CRI-O

This section contains the necessary steps to install CRI-O as CRI runtime.

Use the following commands to install CRI-O on your system:

Prerequisites

modprobe overlay
modprobe br_netfilter

# Setup required sysctl params, these persist across reboots.
cat > /etc/sysctl.d/99-kubernetes-cri.conf <<EOF
net.bridge.bridge-nf-call-iptables  = 1
net.ipv4.ip_forward                 = 1
net.bridge.bridge-nf-call-ip6tables = 1
EOF

sysctl --system

{{< tabs name="tab-cri-cri-o-installation" >}} {{< tab name="Ubuntu 16.04" codelang="bash" >}}

Install prerequisites

apt-get update apt-get install software-properties-common

add-apt-repository ppa:projectatomic/ppa apt-get update

Install CRI-O

apt-get install cri-o-1.11

{{< /tab >}} {{< tab name="CentOS/RHEL 7.4+" codelang="bash" >}}

Install prerequisites

yum-config-manager --add-repo=https://cbs.centos.org/repos/paas7-crio-311-candidate/x86_64/os/

Install CRI-O

yum install --nogpgcheck cri-o

{{< /tab >}} {{< /tabs >}}

Start CRI-O

systemctl start crio

Refer to the CRI-O installation guide for more information.

Containerd

This section contains the necessary steps to use containerd as CRI runtime.

Use the following commands to install Containerd on your system:

Prerequisites

modprobe overlay
modprobe br_netfilter

# Setup required sysctl params, these persist across reboots.
cat > /etc/sysctl.d/99-kubernetes-cri.conf <<EOF
net.bridge.bridge-nf-call-iptables  = 1
net.ipv4.ip_forward                 = 1
net.bridge.bridge-nf-call-ip6tables = 1
EOF

sysctl --system

{{< tabs name="tab-cri-containerd-installation" >}} {{< tab name="Ubuntu 16.04+" codelang="bash" >}} apt-get install -y libseccomp2 {{< /tab >}} {{< tab name="CentOS/RHEL 7.4+" codelang="bash" >}} yum install -y libseccomp {{< /tab >}} {{< /tabs >}}

Install containerd

Containerd releases are published regularly, the values below are hardcoded to the latest version available at the time of writing. Please check for newer versions and hashes here.

# Export required environment variables.
export CONTAINERD_VERSION="1.1.2"
export CONTAINERD_SHA256="d4ed54891e90a5d1a45e3e96464e2e8a4770cd380c21285ef5c9895c40549218"

# Download containerd tar.
wget https://storage.googleapis.com/cri-containerd-release/cri-containerd-${CONTAINERD_VERSION}.linux-amd64.tar.gz

# Check hash.
echo "${CONTAINERD_SHA256} cri-containerd-${CONTAINERD_VERSION}.linux-amd64.tar.gz" | sha256sum --check -

# Unpack.
tar --no-overwrite-dir -C / -xzf cri-containerd-${CONTAINERD_VERSION}.linux-amd64.tar.gz

# Start containerd.
systemctl start containerd

Other CRI runtimes: rktlet and frakti

Refer to the Frakti QuickStart guide and Rktlet Getting Started guide for more information.

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