Kubernetes : Install Kubeadm2023/07/28 |
Install Kubeadm to 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. -----------+---------------------------+--------------------------+------------ | | | eth0|10.0.0.25 eth0|10.0.0.71 eth0|10.0.0.72 +----------+-----------+ +-----------+-----------+ +-----------+-----------+ | [ ctrl.srv.world ] | | [snode01.srv.world] | | [snode02.srv.world] | | Control Plane | | Worker Node | | Worker Node | +----------------------+ +-----------------------+ +-----------------------+ |
[1] | Install Containerd and apply some requirements on all Nodes. |
root@ctrl:~#
root@ctrl:~# apt -y install containerd iptables apt-transport-https gnupg2 curl sudo containerd config default | tee /etc/containerd/config.toml
root@ctrl:~#
vi /etc/containerd/config.toml # line 61 : change sandbox_image = "registry.k8s.io/pause:3.9" # line 125 : change SystemdCgroup = true
root@dlp:~#
systemctl restart containerd.service
root@ctrl:~#
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@ctrl:~#
sysctl --system
root@ctrl:~#
modprobe overlay; modprobe br_netfilter root@ctrl:~# echo -e overlay\\nbr_netfilter > /etc/modules-load.d/k8s.conf
# needs [iptables-legacy] for iptables backend # if nftables is enabled, change to [iptables-legacy] root@ctrl:~# update-alternatives --config iptables
There are 2 choices for the alternative iptables (providing /usr/sbin/iptables).
Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/sbin/iptables-nft 20 auto mode
1 /usr/sbin/iptables-legacy 10 manual mode
2 /usr/sbin/iptables-nft 20 manual mode
Press <enter> to keep the current choice[*], or type selection number: 1
update-alternatives: using /usr/sbin/iptables-legacy to provide /usr/sbin/iptables (iptables) in manual mode
# disable swap root@ctrl:~# swapoff -a
root@ctrl:~#
vi /etc/fstab # comment out #/dev/mapper/debian--vg-swap_1 none swap sw 0 0 |
[2] | Install Kubeadm, Kubelet, Kubectl on all Nodes. |
root@ctrl:~# curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.30/deb/Release.key | gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg root@ctrl:~# echo "deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.30/deb/ /" | tee /etc/apt/sources.list.d/kubernetes.list root@ctrl:~# apt update root@ctrl:~# apt -y install kubeadm kubelet kubectl root@ctrl:~# ln -s /opt/cni/bin /usr/lib/cni |
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