Notes of Kubernetes

Prepare the local working environment

System Initialization

• Turn off firewall
  # temporarily
systemctl stop firewalld
# permanently
systemctl disable firewalld
• Turn off selinux
  # temporarily
sed -i 's/enforcing/disabled/' /etc/selinux/config
# permanently
setenforce 0
• Turn off swap
  # temporarily
swapoff -a
# permanently (add hash (#) to the beginning of the swap partition line)
vim /etc/fstab
• Configure hostname
  hostnamectl set-hostname [hostname]

• Configure static IP
  vi /etc/sysconfig/network-scripts/ifcfg-ens32

  BOOTPROTO="static"
  IPADDR=192.168.8.20
  PREFIX0=24
  GATEWAY=192.168.8.2
  DNS1=114.114.114.114
  DNS2=8.8.8.8

• Add information of hosts (executed only on master node)

  cat >> /etc/hosts << EOF
  192.168.8.20 master01
  192.168.8.21 worker01
  192.168.8.22 worker02
  EOF

• IPv4 transist to iptables

  cat > /etc/sysctl.d/k8s.conf << EOF
  net.bridge.bridge-nf-call-ip6tables = 1
  net.bridge.bridge-nf-call-iptables = 1
  EOF

  sysctl --system

• Synchronize time across cluster nodes
  yum install ntpdate -y
ntpdate time.windows.com

Software Installation

Docker

Kubeadm

Kubelet