基本环境配置

1. 配置主机名：

hostnamectl set-hostname k8s-master01
hostname

2. 修改 hosts 文件

echo '192.168.10.121 k8s-master01
192.168.10.122 k8s-node01
192.168.10.123 k8s-node02
192.168.10.124 k8s-master02
192.168.10.125 k8s-master03' >> /etc/hosts

cat /etc/hosts

3. 配置默认 yum 源：

curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo

yum install -y yum-utils device-mapper device-mapper-persistent-data lvm2

sed -i -e '/mirrors.aliyuncs.com/d' -e '/mirrors.cloud.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo

检查 /etc/yum.repos.d/CentOS-Base.repo 内容：

cat /etc/yum.repos.d/CentOS-Base.repo

4. 安装一些常用的工具

yum install -y wget jq psmisc vim net-tools telnet git

5. 关闭防火墙、SELinux、DNSmasq

systemctl disable --now firewalld
systemctl disable --now dnsmasq
systemctl disable --now NetworkManager

setenforce 0
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/sysconfig/selinux
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/selinux/config

检查防火墙是否关闭：

systemctl status firewalld

6. 关闭Swap分区

swapoff -a && sysctl -w vm.swappiness=0
sed -ri '/^[^#]*swap/s@^@#@' /etc/fstab

7. 配置时间同步

安装 ntpdate：

rpm -ivh http://mirrors.wlnmp.com/centos/wlnmp-release-centos.noarch.rpm
yum install ntpdate -y

同步时间：

ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
echo 'Asia/Shanghai' > /etc/timezone
ntpdate time2.aliyun.com

# crontab -e
*/5 * * * * /usr/sbin/ntpdate time2.aliyun.com

检查定时任务是否配置成功：

# crontab -l
*/5 * * * * /usr/sbin/ntpdate time2.aliyun.com

8. 配置limit

ulimit -SHn 65535
echo '# 末尾添加如下内容
* soft nofile 65536
* hard nofile 131072
* soft nproc 65535
* hard nproc 655350
* soft memlock unlimited
* hard memlock unlimited' >> /etc/security/limits.conf

9. 升级系统并重启

yum update -y  && reboot