Kubernetes : Install Kubeadm2023/10/19 |
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. +----------------------+ +----------------------+ | [ mgr.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 ~]#
cat > /etc/sysctl.d/99-k8s-cri.conf <<EOF net.bridge.bridge-nf-call-iptables=1 net.ipv4.ip_forward=1 net.bridge.bridge-nf-call-ip6tables=1 EOF [root@dlp ~]# sysctl --system
[root@dlp ~]#
modprobe overlay [root@dlp ~]# modprobe br_netfilter [root@dlp ~]# echo -e overlay\\nbr_netfilter > /etc/modules-load.d/k8s.conf
# install from EPEL [root@dlp ~]# dnf --enablerepo=epel -y install iptables-legacy [root@dlp ~]# alternatives --config iptables There are 2 programs which provide 'iptables'. Selection Command ----------------------------------------------- *+ 1 /usr/sbin/iptables-nft 2 /usr/sbin/iptables-legacy # switch to [iptables-legacy] Enter to keep the current selection[+], or type selection number: 2 # set Swap off setting [root@dlp ~]# swapoff -a
[root@dlp ~]#
vi /etc/fstab # comment out the Swap line #/dev/mapper/cs-swap none swap defaults 0 0 |
[2] | On all Kubernetes Cluster Nodes except Manager Node, Install required packages. This example shows to use CRI-O for container runtime. |
[root@dlp ~]#
dnf -y install centos-release-okd-4.16 [root@dlp ~]# sed -i -e "s/enabled=1/enabled=0/g" /etc/yum.repos.d/CentOS-OKD-4.16.repo [root@dlp ~]# dnf --enablerepo=centos-okd-4.16 -y install cri-o
[root@dlp ~]#
[root@dlp ~]# systemctl enable --now crio
cat <<'EOF' > /etc/yum.repos.d/kubernetes.repo
[kubernetes] name=Kubernetes baseurl=https://pkgs.k8s.io/core:/stable:/v1.30/rpm/ enabled=0 gpgcheck=1 gpgkey=https://pkgs.k8s.io/core:/stable:/v1.30/rpm/repodata/repomd.xml.key EOF
[root@dlp ~]#
[root@dlp ~]# dnf --enablerepo=kubernetes -y install kubeadm kubelet cri-tools iproute-tc container-selinux systemctl enable kubelet
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