Lab 4.2 - containerd rather than docker

richardoc

Is there a guide to using containerd rather than docker for running containers given it'll be removed in 1.24 and this lab currently uses 1.23?
https://kubernetes.io/blog/2022/01/07/kubernetes-is-moving-on-from-dockershim/

"LFS260/SOLUTIONS/s_04/k8scp.sh" sets up kubernetes using docker rather than containerd

Thanks!

richardoc

Fixed this by doing the following to both LFS260/SOLUTIONS/s_04/k8scp.sh and LFS260/SOLUTIONS/s_04/k8sWorker.sh

Remove the following section

and adding the following instead

echo "Install and configure containerd"
sleep 2
sudo mkdir -p /etc/containerd

sudo apt install -y containerd

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

sudo systemctl restart containerd

sudo systemctl enable containerd

and changing

sudo apt-get install -y kubeadm=1.23.1-00 kubelet=1.23.1-00 kubectl=1.23.1-00

to

sudo apt-get install -y kubeadm=1.23.1-00 kubelet=1.23.1-00 kubectl=1.23.1-00 --allow-downgrades --allow-change-held-packages

due to some issues with the node I was using.

I hope this helps!

richardoc

Fixed this by doing the following tto LFS260/SOLUTIONS/s_04/k8scp.sh

Remove the following section

echo "Install and configure Docker"
sleep 2

sudo apt-get install -y docker.io

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

sudo systemctl enable docker

sudo systemctl daemon-reload

sudo systemctl restart docker

and adding the following instead

echo "Install and configure containerd"
sleep 2
sudo mkdir -p /etc/containerd

sudo apt install -y containerd

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

sudo systemctl restart containerd

sudo systemctl enable containerd

and changing

sudo apt-get install -y kubeadm=1.23.1-00 kubelet=1.23.1-00 kubectl=1.23.1-00

to

sudo apt-get install -y kubeadm=1.23.1-00 kubelet=1.23.1-00 kubectl=1.23.1-00 --allow-downgrades --allow-change-held-packages

finally, change

sudo kubeadm init --kubernetes-version 1.23.1 --pod-network-cidr 192.168.0.0/16 --cri-socket "unix:///var/run/containerd/containerd.sock"

to

sudo kubeadm init --kubernetes-version 1.23.1 --pod-network-cidr 192.168.0.0/16  --cri-socket "unix:///var/run/containerd/containerd.sock"

For LFS260/SOLUTIONS/s_04/k8sWorker.sh

Remove the following section

echo "Install and configure Docker"
sleep 2

sudo apt-get install -y docker.io

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

sudo systemctl enable docker

sudo systemctl daemon-reload

sudo systemctl restart docker

and adding the following instead

echo "Install and configure containerd"
sleep 2
sudo mkdir -p /etc/containerd

sudo apt install -y containerd

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

sudo systemctl restart containerd

sudo systemctl enable containerd

and changing

sudo apt-get install -y kubeadm=1.23.1-00 kubelet=1.23.1-00 kubectl=1.23.1-00

to

sudo apt-get install -y kubeadm=1.23.1-00 kubelet=1.23.1-00 kubectl=1.23.1-00 --allow-downgrades --allow-change-held-packages

Finally, when running the kubeadm join command, add --cri-socket "unix:///var/run/containerd/containerd.sock"

Eg

```bash

sudo kubeadm join 172.31.254.12:6443 --token super.token --discovery-token-ca-cert-hash sha256:superCA --cri-socket "unix:///var/run/containerd/containerd.sock"

I hope this helps!