HAProxy+Keepalived实现双主高可用负载均衡

一、规划

OS:CentOS7 64bit
HAProxy+Keepalived-1:192.168.10.128
HAProxy+Keepalived-2:192.168.10.129
VIP1:192.168.10.111
VIP2:192.168.10.222
WEB1:192.168.10.130:80
WEB2:192.168.10.131:80

二、配置Keepalived(注:安装及配置详见/article/7194545.html)

①配置keepalived主配置文件(配置文件大部相同)
配置192.168.10.128做192.168.10.111的MASTER,192.168.10.222的BACKUP;
配置192.168.10.128做192.168.10.111的BACKUP,192.168.10.222的MASTER.

a.192.168.10.128配置如下:

# vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
zhi@163.com                   ##设置邮件报警地址
}
notification_email_from zhi@zhi.com
smtp_server 127.0.0.1
smtp_connect_timeout 3
router_id LVS_DEVEL
}
vrrp_script check_haproxy {                      ##添加haproxy服务监控脚本
script "/etc/keepalived/check_haproxy.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {                         ##配置vrrp实例1
state MASTER
interface eno16777736
virtual_router_id 51               ##实例1虚拟路由标识
priority 101
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {                                 ##检测执行脚本
check_haproxy
}
virtual_ipaddress {
192.168.10.111
}
}
vrrp_instance VI_2 {                      ##配置vrrp实例2
state BACKUP
interface eno16777736
virtual_router_id 52                 ##实例2虚拟路由标识
priority 100
advert_int 1
garp_master_delay 5
authentication {
auth_type PASS
auth_pass 1111
}

virtual_ipaddress {
192.168.10.222
}

b.192.168.10.129配置如下:

# vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
zhi@163.com                   ##设置邮件报警地址
}
notification_email_from zhi@zhi.com
smtp_server 127.0.0.1
smtp_connect_timeout 3
router_id LVS_DEVEL
}
vrrp_script check_haproxy {                      ##添加haproxy服务监控脚本
script "/etc/keepalived/check_haproxy.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {                         ##配置vrrp实例1
state BACKUP
interface eno16777736
virtual_router_id 51                     ##实例1虚拟路由标识
priority 100
advert_int 1
garp_master_delay 5
authentication {
auth_type PASS
auth_pass 1111
}

track_script {                           ##检测执行脚本
check_haproxy
}
virtual_ipaddress {
192.168.10.111
}

}
vrrp_instance VI_2 {                       ##配置vrrp实例2
state MASTER
interface eno16777736
virtual_router_id 52                   ##实例2虚拟路由标识
priority 101
advert_int 1
garp_master_delay 5
authentication {
auth_type PASS
auth_pass 1111
}

virtual_ipaddress {
192.168.10.222
}

②配置HAProxy检测脚本

# vi /etc/keepalived/check_haproxy.sh
#!/bin/bash
if [ $(ps -C haproxy --no-header |wc -l) -eq 0 ]
then
systemctl start haproxy
fi
sleep 2
if [ $(ps -C haproxy --no-header |wc -l) -eq 0 ]
then
systemctl stop keepalived
fi
# chmod u+x /etc/keepalived/check_haproxy.sh

③开启keepalived并查看

# systemctl start keepalived

192.168.10.128:




192.168.10.129:




三、配置HAProxy(注:安装及配置详见/article/7194546.html)
①配置HAProxy主配置文件(配置文件相同)

# vi /etc/haproxy/haproxy.cfg
# this config needs haproxy-1.1.28 or haproxy-1.2.1
global                                               ##全局配置
log 127.0.0.1   local0
log 127.0.0.1   local1 notice
#log loghost    local0 info
maxconn 4096
chroot /usr/share/haproxy
uid 99
gid 99
daemon
#debug
#quiet
defaults                                             ##默认配置
log     global
mode    http
option  httplog
option  dontlognull
retries 3
option redispatch
maxconn 4000
timeout connect 5000
timeout client  50000
timeout server  50000
frontend web                                                  ##前端代理
bind 0.0.0.0:80
acl www.zhi.com hdr(host) -i
use_backend www.zhi.com if www.zhi.com
acl www.fly.com hdr(host) -i www.fly.com
use_backend www.fly.com if
backend                     ##后端www.zhi.com作用域
mode http
balance source               ##保存session值
option  httpchk /index.html
server  192.168.10.130 192.168.10.130:80 check inter 2000 rise 2 fall 1
backend                    ##后端www.fly.com作用域
mode http
balance source                 ##保存session值
option  httpchk /index.html
server  192.168.10.131 192.168.10.131:80 check inter 2000 rise 2 fall 1
listen status                           ##监控页面设置
mode http
bind 0.0.0.0:80
stats enable
stats hide-version
stats uri     /haproxyadmin
stats auth    admin:admin
stats admin if TRUE

②开启HAProxy并查看

# systemctl start haproxy

①浏览器输入192.168.10.128/haproxyadmin，输入账号密码查看



②浏览器输入192.168.10.129/haproxyadmin，输入账号密码查看



③浏览器输入192.168.10.111/haproxyadmin，输入账号密码查看



④浏览器输入192.168.10.222/haproxyadmin，输入账号密码查看




四、测试

①更改Windows的hosts文件

C:\Windows\System32\drivers\etc\hosts
192.168.10.111     www.zhi.com
192.168.10.111     www.zhi.com
192.168.10.222     www.fly.com
192.168.10.222     www.fly.com

②测试1
ping www.zhi.com




ping www.fly.com




③测试2
192.168.10.128:

# systemctl stop keepalived
# ip addr

192.168.10.129:
# ip addr



虚拟IP192.168.10.111已漂移至192.168.10.129，继续ping，依然通



OK了

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