installation.md

Install Containerd with Release Tarball

This document provides the steps to install containerd and its dependencies with the release tarball, and bring up a Kubernetes cluster using kubeadm.

These steps have been verified on Ubuntu 16.04. For other OS distributions, the steps may differ. Please feel free to file issues or PRs if you encounter any problems on other OS distributions.

Note: You need to run the following steps on each node you are planning to use in your Kubernetes cluster.

Release Tarball

For each containerd release, we'll publish a release tarball specifically for Kubernetes named cri-containerd-${VERSION}.${OS}-${ARCH}.tar.gz. The release tarball contains all required binaries and files for using containerd with Kubernetes.

Content

As shown below, the release tarball contains:

1. containerd, containerd-shim, containerd-stress, containerd-release, ctr: binaries for containerd.
2. runc: runc binary.
3. crictl, crictl.yaml: command line tools for CRI container runtime and its config file.
4. critest: binary to run CRI validation test.
5. containerd.service: Systemd unit for containerd.
6. /opt/containerd/cluster/: scripts for kube-up.sh.

$ tar -tf cri-containerd-1.1.0-rc.0.linux-amd64.tar.gz
./
./opt
./opt/containerd
./opt/containerd/cluster
./opt/containerd/cluster/gce
./opt/containerd/cluster/gce/cloud-init
./opt/containerd/cluster/gce/cloud-init/node.yaml
./opt/containerd/cluster/gce/cloud-init/master.yaml
./opt/containerd/cluster/gce/configure.sh
./opt/containerd/cluster/gce/env
./opt/containerd/cluster/version
./opt/containerd/cluster/health-monitor.sh
./usr
./usr/local
./usr/local/sbin
./usr/local/sbin/runc
./usr/local/bin
./usr/local/bin/crictl
./usr/local/bin/containerd
./usr/local/bin/containerd-stress
./usr/local/bin/critest
./usr/local/bin/containerd-release
./usr/local/bin/containerd-shim
./usr/local/bin/ctr
./etc
./etc/systemd
./etc/systemd/system
./etc/systemd/system/containerd.service
./etc/crictl.yaml

Binary Information

Information about the binaries in the release tarball:

Binary Name	Support	OS	Architecture
containerd	seccomp, apparmor, overlay, btrfs	linux	amd64
containerd-shim	overlay, btrfs	linux	amd64
runc	seccomp, apparmor	linux	amd64

If you have other requirements for the binaries, e.g. selinux support, another architecture support etc., you need to build the binaries yourself following the instructions.

Download

The release tarball could be downloaded from the release GCS bucket https://storage.googleapis.com/cri-containerd-release/.

Step 0: Install Dependent Libraries

Install required library for seccomp.

sudo apt-get update
sudo apt-get install libseccomp2

Note that:

1. If you are using Ubuntu <=Trusty or Debian <=jessie, a backported version of libseccomp2 is needed. (See the trusty-backports and jessie-backports).

Step 1: Download Release Tarball

Download release tarball for the containerd version you want to install from the GCS bucket.

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

Validate checksum of the release tarball:

sha256sum cri-containerd-${VERSION}.linux-amd64.tar.gz
curl https://storage.googleapis.com/cri-containerd-release/cri-containerd-${VERSION}.linux-amd64.tar.gz.sha256
# Compare to make sure the 2 checksums are the same.

Step 2: Install Containerd

If you are using systemd, just simply unpack the tarball to the root directory:

sudo tar --no-overwrite-dir -C / -xzf cri-containerd-${VERSION}.linux-amd64.tar.gz
sudo systemctl start containerd

If you are not using systemd, please unpack all binaries into a directory in your PATH, and start containerd as monitored long running services with the service manager you are using e.g. supervisord, upstart etc.

Step 3: Install Kubeadm, Kubelet and Kubectl

Follow the instructions to install kubeadm, kubelet and kubectl.

Step 4: Create Systemd Drop-In for Containerd

Create the systemd drop-in file /etc/systemd/system/kubelet.service.d/0-containerd.conf:

[Service]                                                 
Environment="KUBELET_EXTRA_ARGS=--container-runtime=remote --runtime-request-timeout=15m --container-runtime-endpoint=unix:///run/containerd/containerd.sock"

And reload systemd configuration:

systemctl daemon-reload

Bring Up the Cluster

Now you should have properly installed all required binaries and dependencies on each of your node.

The next step is to use kubeadm to bring up the Kubernetes cluster. It is the same with the ansible installer. Please follow the steps 2-4 here.