拓扑
++++++++++++
+ Client + 192.168.122.200/24 (真实机做客户端)
++++++++++++
________________|_______________ 浮动IP eth0:1 192.168.122.199/24
| |
+++++++++++++ +++++++++++++
+ HAproxy master + + HAproxy backup +
+++++++++++++ +++++++++++++
DIP eth0 192.168.122.201/24 DIP eth0 192.168.122.202/24
|______________________________|
______________|_______________
| |
| |
++++++++++++ ++++++++++++
+ HTML A + + HTML B +
++++++++++++ ++++++++++++
eth0 192.168.122.203/24 eth0 192.168.122.204/24
*分别在HAproxy master、HAproxy backup 上部署浮动IP，测试2个HAproxy单独工作都正常。测试完成后都撤掉浮动IP。
##############################################################
解析
192.168.122.200 client.com
192.168.122.201 HAm.com
192.168.122.202 HAb.com
192.168.122.203 web1.com
192.168.122.204 web2.com
##############################################################
web端
HTML A B
[root@web1 ~]# yum install -y httpd 192.168.122.203/24
[root@web2 ~]# yum install -y httpd 192.168.122.204/24
[root@web1 ~]# systemctl start httpd
[root@web1 ~]# echo web1111111111 > /var/www/html/index.html
[root@web2 ~]# echo web2222222222 > /var/www/html/index.html
##############################################################
HAproxy master & HAproxy backup
# yum install -y haproxy keepalived
[root@HAm ~]## cat /etc/haproxy/haproxy.cfg 注意：haproxy2配置文件一样
global
log 127.0.0.1 local2
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 4000
user haproxy
group haproxy
daemon
# turn on stats unix socket
stats socket /var/lib/haproxy/stats
defaults
mode http
log global
option httplog
option dontlognull
option http-server-close
option forwardfor except 127.0.0.0/8
option redispatch
retries 3
timeout http-request 10s
timeout queue 1m
timeout connect 10s
timeout client 1m
timeout server 1m
timeout http-keep-alive 10s
timeout check 10s
maxconn 3000
frontend main *:80
acl html url_reg -i \.html$
use_backend webserver if html
backend webserver
balance roundrobin
option httpchk GET /index.html
# cookie SERVERID insert indirect nocache
server html-A 192.168.122.203:80 weight 1 check inter 2000 rise 2 fall 5
server html-B 192.168.122.204:80 weight 1 check inter 2000 rise 2 fall 5
backend app
balance roundrobin
server app1 127.0.0.1:5001 check
server app2 127.0.0.1:5002 check
server app3 127.0.0.1:5003 check
server app4 127.0.0.1:5004 check
[root@HAm ~]# scp /etc/haproxy/haproxy.cfg 192.168.122.202:/etc/haproxy/haproxy.cfg
[root@HAm ~]# cat /etc/keepalived/keepalived.conf 注意：在haproxy2中 主要修改BACKUP和100
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from Alexandre.keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id HAproxy
}
vrrp_instance VI_1 {
state MASTER 切换 （BACKUP）
interface eth0
virtual_router_id 51
priority 150 切换 （100）
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.122.199/24
}
}
注意：当haproxy1宕机时候是192.168.122.199/24切换到haproxy2下
[root@HAm ~]# ip a
eth0:
inet 192.168.122.201/24 brd 192.168.122.255 scope global noprefixroute eth0
valid_lft forever preferred_lft forever
inet 192.168.122.199/24 scope global secondary eth0
valid_lft forever preferred_lft forever
[root@HAb ~]# ip a
eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 52:90:68:be:9e:65 brd ff:ff:ff:ff:ff:ff
inet 192.168.122.202/24 brd 192.168.122.255 scope global noprefixroute eth0
valid_lft forever preferred_lft forever
自动切换脚本：（脚本主要是为了当haproxy1宕机时候切换到haproxy2上继续操作）
[root@HAm ~]# vi /etc/keepalived/chk_haproxy.sh
#!/bin/bash
# 去掉表头定义haproxy 出现的次数为A
A=`ps -C haproxy --no-header | wc -l`
# 如果出现次数为0 ，则没有启动haproxy服务
if [ $A -eq 0 ]
then systemctl start haproxy
sleep 3
# 如果出现次数等于0，则停止haproxy服务
if [ `ps -C haproxy --no-header | wc -l ` -eq 0 ]
then stop keepalived
fi
fi
[root@HAm ~]# chmod +x /etc/keepalived/chk_haproxy.sh
[root@HAm ~]# scp /etc/keepalived/chk_haproxy.sh 192.168.122.202:/etc/keepalived/
# systemctl start haproxy
# systemctl start keepalived
脚本
[root@HAm ~]# vi /etc/keepalived/chk_ipvsadm.sh
#!/bin/bash
# 去掉表头定义ipvsadm 出现的次数为A
A=`ipvsadm -L | wc -l`
# 如果出现次数为0 ，则没有启动ipvsadm服务
if [ $A -lt 6 ]
then systemctl start keepalived
sleep 3
# 如果出现次数等于0，则停止ipvsadm服务
if [ `ipvsadm -L | wc -l ` -lt 6 ]
then stop keepalived
fi
fi
[root@HAm ~]# chmod +x /etc/keepalived/chk_ipvsadm.sh
[root@HAm ~]# scp /etc/keepalived/chk_ipvsadm.sh 192.168.122.202:/etc/keepalived/chk_ipvsadm.sh
##############################################################
效果：
[root@client ~]# curl 192.168.122.199/index.html
web1111111111
[root@client ~]# curl 192.168.122.199/index.html
web2222222222
[root@client ~]# curl 192.168.122.199/index.html
web1111111111
[root@client ~]# curl 192.168.122.199/index.html
web2222222222
注意：当haproxy1 宕机时候依然可以继续运行
