Cluster construction based on kubernetes v1.24.0 (I)

One 、 Write it at the front

K8S 1.24 As a very important version update , It provides us with many important functions . This version involves 46 Item enhancements ： among 14 Item has been upgraded to stable version ,15 Item enters beta Stage ,13 Item has just entered alpha Stage . Besides , have other 2 This feature is deprecated 、2 This function has been deleted .

• remove kubelet Medium Dockershim

• Close beta API

• Sign the release artifact

• OpenAPI v3

• Officially announced storage capacity and volume expansion

• NonPreemptingPriority Stable release

• Storage plug-in migration

• gRPC Probe upgrade to Beta edition

• Kubelet Upgrade the certificate provider to beta edition

• Context logging enters alpha Stage

• Avoid assigning... To services IP When there is a conflict

For more details, please check ：GIT ChangeLog-1.24.md

Two 、 Environmental preparation

host	CPU	Memory	Hard disk	Host name	IP
CentOS 7.9	2 nucleus	2G	30G	master	192.168.183.133
CentOS 7.9	2 nucleus	2G	30G	node01	192.168.183.134
CentOS 7.9	2 nucleus	2G	30G	node02	192.168.183.135

3、 ... and 、 Virtual machine installation

use VMware Build three virtual machines , Just follow the normal steps , What needs special description here is the network configuration .

1. View network information ：

This picture information is important , It contains subnets IP And gateway , We'll use that later

2. Set the network connection in the virtual machine network adapter to VMnet8

3. Virtual machine configuration

3.1 Setting up IP

And here for simplicity , You need to set the for each virtual machine IP For fixing IP, Can be avoided because IP Change to affect subsequent operations , If conditions permit, you can customize the domain name and build DNS The server parses .

cd /etc/sysconfig/network-scripts/
ls

vim ifcfg-ens33

Here we will modify ifcfg-ens33, Enter the command vim ifcfg-ens33 modify bootproto=“static”, At the same time, the following contents are added , Here we put the virtual machine IP The address was changed to 192.168.183.135.

IPADDR=192.168.183.135
NETNASK=255.255.255.0
GATEWAY=192.168.183.2
 
DNS1=192.168.1.1

3.2 Restart network service

Input service network restart, The following appears , At least it means that there is no problem with our modification .

3.3 Input ip addr

see ip Whether the address is set by us IP Address , As can be seen in the picture ip The address has been modified successfully

3.4 Network testing

ping www.baidu.com

thus ,IP Modified to complete . The other two machines , Also follow this procedure to set .

4 Set host name

stay master Node , Input vim  /etc/hosts, Add these three records

192.168.183.133 master
192.168.183.134 node01
192.168.183.135 node02

5 To configure SSH Password free login

ssh-keygen -t rsa

Local ssh The public key file is installed in node01 and node02

ssh-copy-id node01
ssh-copy-id node02

6 Sync hosts

Put the already set hosts The files are copied to three other machines

scp /etc/hosts node01:/etc/
scp /etc/hosts node02:/etc/

7. Virtual machine configuration

7.1 close 、 Ban 、 uninstall firewalld A firewall

The main purpose of this step is to use K8S Built in security policy

systemctl stop firewalld && systemctl disable firewalld && yum -y remove firewalld

7.2 Empty iptable The rules

iptables -F && iptables -X && iptables -F -t nat && iptables -X -t nat
iptables -P FORWARD ACCEPT

7.3 close swap

swapoff -a && sed -i '/swap/s/^/#/' /etc/fstab
free -h

You can see swap All lines output 0, explain swap Closed successfully