Kubeadm搭建kubernetes集群
作者：互联网
配置各个主机的主机名解析文件(3台都要配置)
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.203.100 master.example.com master
192.168.203.20 node1.example.com node1
192.168.203.30 node2.example.com node2
192.168.203.50 node3.example.com node3
设置时钟同步
master
[root@master ~]# vim /etc/chrony.conf
local stratum 10
[root@master ~]# systemctl restart chronyd
[root@master ~]# systemctl enable chronyd
[root@master ~]# hwclock -w
node2 and 3
[root@node2 ~]# vim /etc/chrony.conf
#pool 2.centos.pool.ntp.org iburst
server master.example.com iburst
[root@node2 ~]# systemctl restart chronyd
[root@node2 ~]# systemctl enable chronyd
[root@node2 ~]# hwclock -w
[root@node3 ~]# vim /etc/chrony.conf
#pool 2.centos.pool.ntp.org iburst
server master.example.com iburst
[root@node3 ~]# systemctl restart chronyd
[root@node3 ~]# systemctl enable chronyd
[root@node3 ~]# hwclock -w
禁用firewalld、selinux、postfix三个主机都需要做
systemctl stop firewalld
systemctl disable firewalld
vim /etc/selinux/conf
SELINUX=disabled
setenforce 0
systemctl stop postfix
systemctl disabled postfix
禁用swap分区 三个主机都需要做
vim /etc/fstab
# /dev/mapper/cs-swap none swap defaults 0 0
swapoff -a 将swap行注释掉
开启IP转发，和修改内核信息—三个节点都需要配置
master
[root@master ~]# vim /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
[root@master ~]# modprobe br_netfilter
[root@master ~]# sysctl -p /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
node2
[root@node2 ~]# vim /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
[root@node2 ~]# modprobe br_netfilter
[root@node2 ~]# sysctl -p /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
node3
[root@node3 ~]# vim /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
[root@node3 ~]# modprobe br_netfilter
[root@node3 ~]# sysctl -p /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
配置IPVS功能（三个节点都做）
master
[root@master ~]# vim /etc/sysconfig/modules/ipvs.modules
#!/bin/bash
modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
[root@master ~]# chmod +x /etc/sysconfig/modules/ipvs.modules
[root@master ~]# bash /etc/sysconfig/modules/ipvs.modules
[root@master ~]# lsmod | grep -e ip_vs
ip_vs_sh 16384 0
ip_vs_wrr 16384 0
ip_vs_rr 16384 0
ip_vs 172032 6 ip_vs_rr,ip_vs_sh,ip_vs_wrr
nf_conntrack 172032 2 nf_nat,ip_vs
nf_defrag_ipv6 20480 2 nf_conntrack,ip_vs
libcrc32c 16384 5 nf_conntrack,nf_nat,nf_tables,xfs,ip_vs
[root@master ~]# reboot