Kubernetes : Install Kubeadm2020/08/19 |
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Install Kubeadm to Configure Multi Nodes Kubernetes Cluster.
This example is based on the emvironment like follows.
For System requirements, each Node has uniq Hostname, MAC address, Product_uuid.
MAC address and Product_uuid are generally already uniq one if you installed OS on phisical machine or virtual machine with common procedure. You can see Product_uuid with the command [dmidecode -s system-uuid].
-----------+---------------------------+--------------------------+------------
| | |
eth0|10.0.0.30 eth0|10.0.0.51 eth0|10.0.0.52
+----------+-----------+ +-----------+----------+ +-----------+----------+
| [ dlp.srv.world ] | | [ node01.srv.world ] | | [ node02.srv.world ] |
| Master Node | | Worker Node | | Worker Node |
+----------------------+ +----------------------+ +----------------------+
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| [1] | Install Docker and Apply some requirements on all Nodes. |
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root@dlp:~#
apt -y install docker.io apt-transport-https # cgroup driver uses systemd
root@dlp:~# cat > /etc/docker/daemon.json <<EOF
{
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": {
"max-size": "100m"
},
"storage-driver": "overlay2"
}
EOF
root@dlp:~# cat > /etc/sysctl.d/k8s.conf <<EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
root@dlp:~#
sysctl --system
# needs [iptables-legacy] for iptables backend # if set nftables ot others, change to [iptables-legacy] root@dlp:~# update-alternatives --config iptables There are 2 choices for the alternative iptables (providing /usr/sbin/iptables). Selection Path Priority Status ------------------------------------------------------------ * 0 /usr/sbin/iptables-legacy 20 auto mode 1 /usr/sbin/iptables-legacy 20 manual mode 2 /usr/sbin/iptables-nft 10 manual mode Press <enter> to keep the current choice[*], or type selection number: # if swap is On, turn to Off root@dlp:~# swapoff -a
root@dlp:~#
vi /etc/fstab # comment out swap line # /dev/mapper/ubuntu--vg-swap_1 none swap sw 0 0
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| [2] | Install Kubeadm, Kubelet, Kubectl on all Nodes. |
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root@dlp:~# curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add - OK root@dlp:~# echo "deb http://apt.kubernetes.io/ kubernetes-xenial main" | tee -a /etc/apt/sources.list.d/kubernetes.list root@dlp:~# apt update root@dlp:~# apt -y install kubeadm kubelet kubectl |
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