Installing k8s

• Yesterday we were able to install k8s buts pods were not intializing, this problem is due to CNI (Flannel)
• Today lets try the same with one more CNI (Weave-Ne
• t)

Steps

• Install docker on all the nodes

curl -fsSL https://get.docker.com -o install-docker.sh
sh install-docker.sh
sudo usermod -aG docker ubuntu

• Now exit and relogin and verify docker installation with docker info on all nodes
• Now install cri-dockerd

cd /tmp
wget https://github.com/Mirantis/cri-dockerd/releases/download/v0.3.16/cri-dockerd_0.3.16.3-0.ubuntu-jammy_amd64.deb
sudo dpkg -i cri-dockerd_0.3.16.3-0.ubuntu-jammy_amd64.deb

• Our docker engine will be running on CRI-Socket unix:///var/run/cri-dockerd.sock
• Now install kubeadm, kubelet and kubectl on all three nodes

sudo apt-get update
# apt-transport-https may be a dummy package; if so, you can skip that package
sudo apt-get install -y apt-transport-https ca-certificates curl gpg
# If the directory `/etc/apt/keyrings` does not exist, it should be created before the curl command, read the note below.
# sudo mkdir -p -m 755 /etc/apt/keyrings
curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.32/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg
# This overwrites any existing configuration in /etc/apt/sources.list.d/kubernetes.list
echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.32/deb/ /' | sudo tee /etc/apt/sources.list.d/kubernetes.list
sudo apt-get update
sudo apt-get install -y kubelet kubeadm kubectl
sudo apt-mark hold kubelet kubeadm kubectl
sudo systemctl enable --now kubelet

• Script for user data

#!/bin/bash
curl -fsSL https://get.docker.com -o install-docker.sh
sh install-docker.sh
cd /tmp
wget https://github.com/Mirantis/cri-dockerd/releases/download/v0.3.16/cri-dockerd_0.3.16.3-0.ubuntu-jammy_amd64.deb
sudo dpkg -i cri-dockerd_0.3.16.3-0.ubuntu-jammy_amd64.deb
sudo apt-get update
sudo apt-get install -y apt-transport-https ca-certificates curl gpg
curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.32/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg
echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.32/deb/ /' | sudo tee /etc/apt/sources.list.d/kubernetes.list
sudo apt-get update
sudo apt-get install -y kubelet kubeadm kubectl
sudo apt-mark hold kubelet kubeadm kubectl
sudo systemctl enable --now kubelet

• Login into master node and become root user

sudo -i

• Now initialize a k8s cluster

kubeadm init --cri-socket "unix:///var/run/cri-dockerd.sock"

• Now install weave net CNI

kubectl apply -f https://github.com/weaveworks/weave/releases/download/v2.8.1/weave-daemonset-k8s.yaml

• Exercise: Create a two node k8s cluster in both aws and azure using virtual machines