通过sealos部署K8S集群v1.25.0_sealos centos-优快云博客

本文详细介绍了如何在基于CentOS的虚拟机上利用sealos部署Kubernetes v1.25.0集群。步骤包括准备虚拟机、更新yum源、配置环境、免密登录、安装sealos，以及集群安装的脚本和常见问题解决。提供了解决DNS问题、安装sealos、启动k8s集群的命令参考。

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通过sealos部署K8S

1、基于如下centos镜像，准备虚拟机

链接：https://pan.baidu.com/s/1BH8wHuotYnrk0wOj_48afA?pwd=acc4
提取码：acc4

三台服务器IP如下

pc254(master)，192.168.32.254
pc253(node),192.168.32.253
pc252(node),192.168.32.252

通过如下脚本修改ip地址

vi /etc/sysconfig/network-scripts/ifcfg-ens33

设置DNS，会影响mirrors.aliyun.com的连接,DNS1一定四8.8.8.8，否则aliyun.com连接不通。

# 打开文件，编辑文件
vi /etc/sysconfig/network-scripts/ifcfg-enp33
# 新增
DNS1=8.8.8.8
DNS2=8.8.4.4
DNS3=114.114.114.114

如果通过如上脚本修改了ip，需要根据如下脚本重启网络才能生效

systemctl restart NetworkManager
systemctl restart nertwork

2、更新yum源

curl使用说明参考CentOS curl命令详解

rm  -fv  rm -f /etc/yum.repos.d/*
while  [ true ]; do  curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo   && break  1   ;done
while  [ true ]; do  curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo   && break  1   ;done

3、基础环境配置

更新yum

yum update -y

关闭防火墙

# 关闭防火墙 
systemctl stop firewalld && systemctl disable firewalld 
 
# 关闭selinux 
sed -i 's/enforcing/disabled/' /etc/selinux/config  # 永久 
setenforce 0  # 临时 
 
# 关闭swap 
swapoff -a  # 临时 
sed -ri 's/.*swap.*/#&/' /etc/fstab    # 永久 
 
# 根据规划设置主机名 
hostnamectl set-hostname <hostname> 
 
# 在master添加hosts 
cat >> /etc/hosts << EOF 
192.168.32.254 pc254 
192.168.32.253 pc253
192.168.32.252 pc252
EOF
 
# 时间同步 
yum install ntpdate -y && ntpdate ntp.aliyun.com

4、配置免密登录

254服务器执行如下脚本，参考：多台Centos7配置相互间的免密登录


[root@pc254 ~]# ssh-keygen -t dsa
Generating public/private dsa key pair.
Enter file in which to save the key (/root/.ssh/id_dsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /root/.ssh/id_dsa.
Your public key has been saved in /root/.ssh/id_dsa.pub.
The key fingerprint is:
SHA256:OJ472fTiMcoVY1Mtsh9PCKITzwtRHvCDpG0wT/VeFBg root@pc254
The key's randomart image is:
+---[DSA 1024]----+
|  o +o+ Eoo.     |
|   O = o.. .     |
|  . B = + + .    |
|   . * = * o     |
|    + = S o .    |
|     + =.= +     |
|      +++.. .    |
|     .o+oo.      |
|      +o..       |
+----[SHA256]-----+
[root@pc254 ~]# 
[root@pc254 ~]# ll -a
total 42408
dr-xr-x---.  5 root root      213 Dec 20 20:01 .
dr-xr-xr-x. 17 root root      244 Dec 21 08:51 ..
-rw-------.  1 root root     1353 Dec 20 16:29 anaconda-ks.cfg
-rw-------.  1 root root      969 Dec 20 20:01 .bash_history
-rw-r--r--.  1 root root       18 Dec 29  2013 .bash_logout
-rw-r--r--.  1 root root      176 Dec 29  2013 .bash_profile
-rw-r--r--.  1 root root      176 Dec 29  2013 .bashrc
-rw-r--r--.  1 root root      100 Dec 29  2013 .cshrc
drwxr-----.  3 root root       19 Dec 20 17:13 .pki
drwxr-xr-x.  4 root root       33 Dec 20 18:04 .sealos
-rw-r--r--.  1 root root 43393801 Dec 20 17:06 sealos_4.1.3_linux_amd64.tar.gz
drwx------.  2 root root       57 Dec 21 09:50 .ssh
-rw-r--r--.  1 root root      129 Dec 29  2013 .tcshrc
[root@pc254 ~]# ll -a .ssh
total 12
drwx------. 2 root root  57 Dec 21 09:50 .
dr-xr-x---. 5 root root 213 Dec 20 20:01 ..
-rw-------  1 root root 668 Dec 21 09:50 id_dsa
-rw-r--r--  1 root root 600 Dec 21 09:50 id_dsa.pub
-rw-r--r--. 1 root root 352 Dec 20 20:00 known_hosts
[root@pc254 ~]# 

[root@pc254 ~]# cat .ssh/id_dsa.pub 
ssh-dss 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 root@pc254

[root@pc254 ~]# cat .ssh/id_dsa
-----BEGIN DSA PRIVATE KEY-----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-----END DSA PRIVATE KEY-----
[root@pc254 ~]#

252,253两台服务器上执行如下脚本

ssh-keygen -t dsa

把id_dsa.pub复制到authorized_keys中，内容如下


[root@pc254 .ssh]# cat authorized_keys 
ssh-dss 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 root@pc253
ssh-dss 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 root@pc254
ssh-dss AAAAB3NzaC1kc3MAAACBAI4tgBXmx5U4j6bfZvdCeCJ19c+SYiAG3Wg2HVSBkSE3uGCzJxRdktNP1YqFkbyPmo6touWNuCOoDGqwaqjGlA8Z