1. 致谢
这篇文章参考了老男孩王导的视频，在此表示感谢和致敬！
2. 安装CentOS操作系统
系统镜像：CentOS-7-x86_64-DVD-2009.iso
安装过程略。
3. 环境准备
3.1 修改主机名
[root@CentOS-11 ~]# hostnamectl set-hostname cfzx55-11.host.com
[root@CentOS-11 ~]# logout
[root@cfzx55-11 ~]# hostname
cfzx55-11.host.com
[root@cfzx55-11 ~]#
3.2 修改IP地址
[root@cfzx55-11 ~]# vi /etc/sysconfig/network-scripts/ifcfg-eth0
[root@cfzx55-11 ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
TYPE="Ethernet"
PROXY_METHOD="none"
BROWSER_ONLY="no"
BOOTPROTO="static"
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
NAME="eth0"
DEVICE="eth0"
ONBOOT="yes"
IPADDR=10.211.55.11
NETMASK=255.255.255.0
GATEWAY=10.211.55.1
DNS1=10.211.55.1
3.3 关闭IPV6地址
[root@cfzx55-11 ~]# vi /etc/default/grub
[root@cfzx55-11 ~]# cat /etc/default/grub
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="ipv6.disable=1 crashkernel=auto spectre_v2=retpoline rd.lvm.lv=centos_centos-11/root rd.lvm.lv=centos_centos-11/swap rhgb quiet"
GRUB_DISABLE_RECOVERY="true"
[root@cfzx55-11 ~]#
GRUB_CMDLINE_LINUX中增加ipv6.disable=1
[root@cfzx55-11 ~]# grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-3.10.0-1160.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-1160.el7.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-64ff7fa49756f945a81d0b1b41f366c5
Found initrd image: /boot/initramfs-0-rescue-64ff7fa49756f945a81d0b1b41f366c5.img
done
[root@cfzx55-11 ~]# reboot
3.4 关闭SELinux
[root@cfzx55-11 ~]# vi /etc/selinux/config
[root@cfzx55-11 ~]# cat /etc/selinux/config | grep SELINUX=
# SELINUX= can take one of these three values:
SELINUX=disabled
[root@cfzx55-11 ~]#
3.5 关闭防火墙
[root@cfzx55-11 ~]# systemctl stop firewalld
[root@cfzx55-11 ~]# systemctl disable firewalld
Removed symlink /etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
[root@cfzx55-11 ~]#
3.6 关闭邮件服务
[root@cfzx55-11 ~]# systemctl stop postfix
[root@cfzx55-11 ~]# systemctl disable postfix
Removed symlink /etc/systemd/system/multi-user.target.wants/postfix.service.
[root@cfzx55-11 ~]#
3.7 安装常用软件
[root@cfzx55-11 ~]# yum install -y wget vim net-tools
3.8 调整base源、EPEL源，添加K8S源
# 备份
[root@cfzx55-11 ~]# mv /etc/yum.repos.d/CentOS-Base.repo{,.bak}
# 使用阿里镜像源
[root@cfzx55-11 ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
2022-02-27 14:25:05 (2.06 MB/s) - '/etc/yum.repos.d/CentOS-Base.repo' saved [2523/2523]
# 安装epel源
[root@cfzx55-11 ~]# wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
2022-02-27 14:26:02 (84.3 MB/s) - '/etc/yum.repos.d/epel.repo' saved [664/664]
[root@cfzx55-11 ~]# vim /etc/yum.repos.d/k8s.repo
[root@cfzx55-11 ~]# cat /etc/yum.repos.d/k8s.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
# 清除系统yum缓存，重新生成
[root@cfzx55-11 ~]# yum clean all
[root@cfzx55-11 ~]# yum makecache -y
# 查看系统可用yum源和所有yum源
[root@cfzx55-11 ~]# yum repolist enabled
Failed to set locale, defaulting to C
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
repo id repo name status
base/7/x86_64 CentOS-7 - Base - mirrors.aliyun.com 10072
epel/x86_64 Extra Packages for Enterprise Linux 7 - x86_64 13746
extras/7/x86_64 CentOS-7 - Extras - mirrors.aliyun.com 509
kubernetes Kubernetes 775
updates/7/x86_64 CentOS-7 - Updates - mirrors.aliyun.com 3572
repolist: 28674
[root@cfzx55-11 ~]#
3.9 时间同步
# 查看系统时间、时区
[root@cfzx55-11 ~]# timedatectl
[root@cfzx55-11 ~]# timedatectl list-timezones | grep -i shanghai
Asia/Shanghai
[root@cfzx55-11 ~]# timedatectl set-timezone Asia/Shanghai
[root@cfzx55-11 ~]# timedatectl status
Local time: Sat 2022-03-12 14:36:48 CST
Universal time: Sat 2022-03-12 06:36:48 UTC
RTC time: Sat 2022-03-12 06:36:48
Time zone: Asia/Shanghai (CST, +0800)
NTP enabled: yes
NTP synchronized: yes
RTC in local TZ: no
DST active: n/a
[root@cfzx55-11 ~]#
# 安装chrony
[root@cfzx55-11 ~]# yum -y install chrony
# 配置chrony
[root@cfzx55-11 ~]# vim /etc/chrony.conf
[root@cfzx55-11 ~]# cat /etc/chrony.conf
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
server ntp1.alyun.com
server ntp2.alyun.com
server ntp3.alyun.com
# 启动 chrony
[root@cfzx55-11 ~]# systemctl start chronyd
# 设为开机自启动
[root@cfzx55-11 ~]# systemctl enable chronyd
3.10 关闭swap分区
[root@cfzx55-11 ~]# vim /etc/fstab
# 注释swap一行
3.11 内核优化
[root@cfzx55-11 ~]# vim /etc/sysctl.d/k8s.conf
[root@cfzx55-11 ~]# cat /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-iptables=1
net.bridge.bridge-nf-call-ip6tables=1
net.ipv4.ip_forward=1
net.ipv4.tcp_tw_recycle=0
[root@cfzx55-11 ~]# sysctl --system
3.12 克隆虚拟机：
共5台虚拟机，克隆完成后，修改IP地址和hostname
| 序号 | IP地址 | hostname |
|---|---|---|
| 1 | 10.211.55.11 | cfzx55-11.host.com |
| 2 | 10.211.55.12 | cfzx55-12.host.com |
| 3 | 10.211.55.21 | cfzx55-21.host.com |
| 4 | 10.211.55.22 | cfzx55-22.host.com |
| 5 | 10.211.55.200 | cfzx55-200.host.com |