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cluster-setup-kubeadm.md

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Kubernetes Cluster Setup using kubeadm

using kubeadm

Duration: ~10 hours without success

On Hyper-V Server:

  • Creating 3 hosts with 4 vCores, 8 GB RAM, 32 GB SSDs, using Debian 12.9
    • Under Hyper-V, make sure to deactivate Secure Boot to actually being able to load the ISO image for installation
    • k8s-node-1.k8s.jochenlinnemann.de
    • k8s-node-2.k8s.jochenlinnemann.de
    • k8s-node-3.k8s.jochenlinnemann.de

On Server VMs (Hyper-V Console):

  • Verifying MAC address and product_uuid uniqueness among nodes
    • ...135
    • ...136
    • ...138
  • Updating system components (if necessary)
    • apt install sudo
    • /sbin/usermod -aG sudo <user>
    • sudo apt install openssh-server
    • sudo systemctl enable ssh
    • sudo apt install ufw
    • sudo ufw allow ssh

On Server VMs (SSH Console):

  • Disabling swap: sudo swapoff -a
  • Opening the firewall for required ports:
    • sudo ufw allow 6443/tcp
    • sudo ufw allow 2379:2380/tcp
    • sudo ufw allow 10250/tcp
    • sudo ufw allow 10256/tcp
    • sudo ufw allow 10257/tcp
    • sudo ufw allow 10259/tcp
    • sudo ufw allow 30000:32767/tcp
    • sudo ufw enable
    • sudo ufw reload
  • Installing container runtime (containerd): 
    •   cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
  net.ipv4.ip_forward = 1
  EOF
    • sudo sysctl --system
    • sudo apt install containerd
    • sudo systemctl daemon-reload
    • sudo systemctl enable --now containerd
    • sudo apt install runc
    • sudo nano /etc/containerd/config.toml
    •   [plugins]
    [plugins."io.containerd.grpc.v1.cri"]
    ...
      [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc]
        [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc.options]
          SystemdCgroup = true
    • sudo systemctl restart containerd
  • Installing kubeadm, kubelet and kubectl
    • 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
  • Creating a cluster with kubeadm
    • ip route show
    • node-1:
      • sudo kubeadm init - ERROR (API server not healthy)
      • sudo kubeadm reset
      • sudo kubeadm init - ERROR (API server not healthy) ... missing api server pod name???
      • sudo kubeadm reset

Pausing this for now. What a hassle...