1. 服务器信息

2. 系统架构图

3 安装部署

3.1 安装相应软件包

三台都要装

yum install ntp -y

yum install -y ipvsadm

yum install –y keepalived

yum install -y nc

3.2 配置ntp服务，时间同步

vi /etc/ntp.conf

#server 0.centos.pool.ntp.org iburst

#server 1.centos.pool.ntp.org iburst

#server 2.centos.pool.ntp.org iburst

#server 3.centos.pool.ntp.org iburst

server ntp.aliyun.com

systemctl start ntpd

systemctl status ntpd

systemctl enable ntpd

3.3 配置keepalived高可用

cd /etc/keepalived/

cp keepalived.conf keepalived.conf.bak

mkdir -p /usr/local/scripts/keepalived/

vi /usr/local/scripts/keepalived/UDP_CHECK.sh

#!/bin/bash

/usr/bin/nc -uz -w1 $1 $2 >/dev/null

exit $?

主节点：

vi /etc/keepalived/keepalived.conf

global_defs {

router_id timeserver01 #标识当前节点名字，两个节点的此项需要不相同。

}

vrrp_instance ntp { #定义一个实例，一个集群就是一个实例。 默认VI_1 可以随意改

state MASTER #指定 A 节点为主节点 备用节点上设置为 BACKUP 即可

interface ens192 #绑定虚拟 IP 的网络接口

virtual_router_id 51 #VRRP 组名，两个节点的设置必须一样，以指明各个节点属于同一 VRRP 组

priority 100 #主节点的优先级（1-254 之间），备用节点必须比主节点优先级低

advert_int 1 #组播信息发送间隔，两个节点设置必须一样

authentication { #设置验证信息，两个节点必须一致

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.100.113 #指定虚拟 IP, 两个节点设置必须一样

}

}

virtual_server 192.168.100.113 123 { #对虚拟IP63添加LVS相关内容

delay_loop 6 #Keepalived 多长时间监测一次 RS

lb_algo rr #分发算法

lb_kind DR #DR 模式

protocol UDP

real_server 192.168.100.110 123 {

weight 1

MISC_CHECK {

misc_path "/usr/local/scripts/keepalived/UDP_CHECK.sh 192.168.100.110 123"

misc_timeout 10

}

}

real_server 192.168.100.111 123 {

weight 1

MISC_CHECK {

misc_path "/usr/local/scripts/keepalived/UDP_CHECK.sh 192.168.100.111 123"

misc_timeout 10

}

}

real_server 192.168.100.112 123 {

weight 1

MISC_CHECK {

misc_path "/usr/local/scripts/keepalived/UDP_CHECK.sh 192.168.100.112 123"

misc_timeout 10

}

}

}

备节点：

vi /etc/keepalived/keepalived.conf

global_defs {

router_id timeserver02 #标识当前节点名字，两个节点的此项需要不相同。

}

vrrp_instance ntp { #定义一个实例，一个集群就是一个实例。 默认VI_1 可以随意改

state BACKUP #指定 A 节点为主节点 备用节点上设置为 BACKUP 即可

interface ens192 #绑定虚拟 IP 的网络接口

virtual_router_id 51 #VRRP 组名，两个节点的设置必须一样，以指明各个节点属于同一 VRRP 组

priority 90 #主节点的优先级（1-254 之间），备用节点必须比主节点优先级低

advert_int 1 #组播信息发送间隔，两个节点设置必须一样

authentication { #设置验证信息，两个节点必须一致

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.100.113 #指定虚拟 IP, 两个节点设置必须一样

}

}

virtual_server 192.168.100.113 123 { #对虚拟IP63添加LVS相关内容

delay_loop 6 #Keepalived 多长时间监测一次 RS

lb_algo rr #分发算法

lb_kind DR #DR 模式

protocol UDP

real_server 192.168.100.110 123 {

weight 1

MISC_CHECK {

misc_path "/usr/local/scripts/keepalived/UDP_CHECK.sh 192.168.100.110 123"

misc_timeout 10

}

}

real_server 192.168.100.111 123 {

weight 1

MISC_CHECK {

misc_path "/usr/local/scripts/keepalived/UDP_CHECK.sh 192.168.100.111 123"

misc_timeout 10

}

}

real_server 192.168.100.112 123 {

weight 1

MISC_CHECK {

misc_path "/usr/local/scripts/keepalived/UDP_CHECK.sh 192.168.100.112 123"

misc_timeout 10

}

}

}

systemctl status keepalived

systemctl enable keepalived

systemctl start keepalived

3.4 配置ip地址转发，三个节点都要

vi /etc/init.d/add-vip

#!/bin/bash

VIP=192.168.100.113

. /etc/rc.d/init.d/functions

case "$1" in

start)

ifconfig ens192:1 $VIP netmask 255.255.255.255 broadcast $VIP up

/sbin/route add -host $VIP dev ens192:1

echo "1" >/proc/sys/net/ipv4/conf/ens192/arp_ignore

echo "2" >/proc/sys/net/ipv4/conf/ens192/arp_announce

echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore

echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce

sysctl -p >/dev/null 2>&1

echo "RealServer Start OK"

;;

stop)

ifconfig ens192:1 down

route del $VIP >/dev/null 2>&1

echo "0" >/proc/sys/net/ipv4/conf/ens192/arp_ignore

echo "0" >/proc/sys/net/ipv4/conf/ens192/arp_announce

echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore

echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce

echo "RealServer Stoped"

;;

*)

echo "Usage: $0 {start|stop}"

exit 1

esac

exit 0

chmod +x /etc/init.d/add-vip

/etc/init.d/add-vip start

3.5 客户端配置

*/5 * * * * /usr/sbin/ntpdate ntp.nbdeli.com