Kubernetes : Install Kubeadm2025/08/25

Configure Multi Nodes Kubernetes Cluster. This example is based on the environment like follows. For System requirements, each Node has unique Hostname, MAC address, Product_uuid. MAC address and Product_uuid are generally already unique one if you installed OS on physical machine or virtual machine with common procedure. You can see Product_uuid with the command [dmidecode -s system-uuid]. +----------------------+ +----------------------+ | [ ctrl.srv.world ] | | [ dlp.srv.world ] | | Manager Node | | Control Plane | +-----------+----------+ +-----------+----------+ eth0|10.0.0.25 eth0|10.0.0.30 | | ------------+--------------------------+----------- | | eth0|10.0.0.51 eth0|10.0.0.52 +-----------+----------+ +-----------+----------+ | [ node01.srv.world ] | | [ node02.srv.world ] | | Worker Node#1 | | Worker Node#2 | +----------------------+ +----------------------+

[1]	On all Kubernetes Cluster Nodes except Manager Node, Change settings for System requirements.

root@dlp:~#  apt -y install containerd curl gpg root@dlp:~#  containerd config default | tee /etc/containerd/config.toml root@dlp:~#  vi /etc/containerd/config.toml # line 67 : change sandbox_image = "registry.k8s.io/pause:3.10" # line 139 : change SystemdCgroup = true root@dlp:~#  systemctl restart containerd.service root@dlp:~#  cat > /etc/sysctl.d/99-k8s-cri.conf <<EOF net.bridge.bridge-nf-call-iptables=1 net.bridge.bridge-nf-call-ip6tables=1 net.ipv4.ip_forward=1 EOF root@dlp:~#  sysctl --system # disable swap root@dlp:~#  swapoff -a root@dlp:~#  vi /etc/fstab # comment out #/dev/mapper/debian--vg-swap_1 none swap sw 0 0

[2]	On all Kubernetes Cluster Nodes except Manager Node, Install required packages.

root@dlp:~#  curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.33/deb/Release.key | gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg root@dlp:~#  echo "deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.33/deb/ /" | tee /etc/apt/sources.list.d/kubernetes.list root@dlp:~#  apt update root@dlp:~#  apt -y install kubeadm kubelet kubectl root@dlp:~#  ln -s /opt/cni/bin /usr/lib/cni