Kubeadm搭建kubernetes集群

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

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