Install containerd

In this chapter, we will install the container runtime

• Install containerd

  # Add Docker's official GPG key:
  sudo apt-get update
  sudo apt-get install ca-certificates curl
  sudo install -m 0755 -d /etc/apt/keyrings
  sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
  sudo chmod a+r /etc/apt/keyrings/docker.asc
  
  # Add the repository to Apt sources:
  echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
  $(. /etc/os-release && echo "${UBUNTU_CODENAME:-$VERSION_CODENAME}") stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
  sudo apt-get update

  sudo apt-get install containerd.io

• Create default containerd config file

  containerd config default | sudo tee /etc/containerd/config.toml

• Enable Cgroup to get support for Cgroup v2

  sudo sed -i 's/SystemdCgroup = false/SystemdCgroup = true/' /etc/containerd/config.toml

• Restart containerd

  sudo systemctl restart containerd
  sudo systemctl status containerd

  Output:-

  ● containerd.service - containerd container runtime
      Loaded: loaded (/usr/lib/systemd/system/containerd.service; enabled; preset: enabled)
      Active: active (running) since Wed 2025-02-05 21:47:38 UTC; 32s ago
      Docs: https://containerd.io
      Process: 2555 ExecStartPre=/sbin/modprobe overlay (code=exited, status=0/SUCCESS)
  Main PID: 2558 (containerd)
      Tasks: 9
      Memory: 13.6M (peak: 14.1M)
          CPU: 162ms
      CGroup: /system.slice/containerd.service
              └─2558 /usr/bin/containerd
  
  Feb 05 21:47:38 cks-master containerd[2558]: time="2025-02-05T21:47:38.695180848Z" level=info msg="Start subscribing containerd event"
  Feb 05 21:47:38 cks-master containerd[2558]: time="2025-02-05T21:47:38.695912510Z" level=info msg="Start recovering state"
  Feb 05 21:47:38 cks-master containerd[2558]: time="2025-02-05T21:47:38.696006958Z" level=info msg="Start event monitor"
  Feb 05 21:47:38 cks-master containerd[2558]: time="2025-02-05T21:47:38.696017639Z" level=info msg="Start snapshots syncer"
  Feb 05 21:47:38 cks-master containerd[2558]: time="2025-02-05T21:47:38.696025262Z" level=info msg="Start cni network conf syncer for default"
  Feb 05 21:47:38 cks-master containerd[2558]: time="2025-02-05T21:47:38.696035741Z" level=info msg="Start streaming server"
  Feb 05 21:47:38 cks-master containerd[2558]: time="2025-02-05T21:47:38.696123579Z" level=info msg=serving... address=/run/containerd/containerd.sock.ttrpc
  Feb 05 21:47:38 cks-master containerd[2558]: time="2025-02-05T21:47:38.696159432Z" level=info msg=serving... address=/run/containerd/containerd.sock
  Feb 05 21:47:38 cks-master containerd[2558]: time="2025-02-05T21:47:38.696201277Z" level=info msg="containerd successfully booted in 0.021733s"
  Feb 05 21:47:38 cks-master systemd[1]: Started containerd.service - containerd container runtime.

• Enable packet forwarding

  # sysctl params required by setup, params persist across reboots
  cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
  net.ipv4.ip_forward = 1
  EOF
  
  # Apply sysctl params without reboot
  sudo sysctl --system