首页 > 代码库 > Haproxy + keepalived 高可用负载均衡解决方案
Haproxy + keepalived 高可用负载均衡解决方案
文档作者：amunlinux
文档版本：Version 1.1
修改记录：2017-04-22
系统环境：CentOS 6.8 64 bit
IP 信息列表：
名称 IP
-----------------------------------
VIP 192.168.200.254
Haproxy-1 192.168.200.202
Haproxy-2 192.168.200.204
Nginx1 192.168.200.202
Nginx2 192.168.200.203
1、在Nginx1/2上编译安装nginx服务
1.1首先安装Nginx1
[root@Nginx-1 ~]# yum -y install pcre-devel zlib-devel
[root@Nginx-1 ~]# useradd -M -s /sbin/nologin nginx
[root@Nginx-1 ~]# tar xf nginx-1.6.2.tar.gz -C /usr/src
[root@Nginx-1 ~]# cd /usr/src/nginx-1.6.2
[root@Nginx-1 nginx-1.6.2]# ./configure --prefix=/usr/local/nginx --user=nginx --group=nginx && make && make install
[root@Nginx-1 nginx-1.6.2]# cd /usr/local/nginx/html/
[root@Nginx-1 html]# echo "server 192.168.200.202" > index.html
[root@Nginx-1 html]# /usr/local/nginx/sbin/nginx
[root@Nginx-1 html]# netstat -anpt |grep nginx
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 4503/nginx
1.2安装Nginx2， 同Nginx1搭建方式是一样的。
与Nginx1唯一不同的是：
[root@Nginx-2 html]# echo "server 192.168.200.203" > index.html
2.安装Haproxy-1与Haproxy-2 两台机器配置一致：
[root@Haproxy-1 ~]# yum -y install pcre-devel bzip2-devel
[root@Haproxy-1 ~]# tar xf haproxy-1.4.24.tar.gz -C /usr/src/
[root@Haproxy-1 ~]# cd /usr/src/haproxy-1.4.24/
[root@Haproxy-1 haproxy-1.4.24]# make TARGET=linux26 && make install
2.1Haproxy服务器配置
建立haproxy的配置目录及文件
[root@Haproxy-1 haproxy-1.4.24]# mkdir /etc/haproxy
[root@Haproxy-1 haproxy-1.4.24]# cp examples/haproxy.cfg /etc/haproxy/
2.2 haproxy配置项的介绍
haproxy的配置文件通常分为三部分: global（全局配置部分） defaults（默认配置部分） listen(应用组件部分)
[root@Haproxy-1 ~]# vim /etc/haproxy/haproxy.cfg
# this config needs haproxy-1.1.28 or haproxy-1.2.1
global
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
log global
mode http
option httplog
option dontlognull
retries 3
#redispatch
maxconn 2000
contimeout 5000
clitimeout 50000
srvtimeout 50000
listen web-cluster 0.0.0.0:80
option httpchk GET /index.html
balance roundrobin
server inst1 192.168.200.202:80 check inter 2000 fall 3
server inst2 192.168.200.203:80 check inter 2000 fall 3
2.3 创建自启动脚本
[root@Haproxy-1 ~]# cp /usr/src/haproxy-1.4.24/examples/haproxy.init /etc/init.d/haproxy
[root@Haproxy-1 ~]# ln -s /usr/local/sbin/haproxy /usr/sbin/haproxy
[root@Haproxy-1 ~]# chmod +x /etc/init.d/haproxy
[root@Haproxy-1 ~]# /etc/init.d/haproxy start
Starting haproxy: [确定]
2.4 测试：
用浏览器打开 http://192.168.200.204
再次打开一个新的浏览器再次访问 http://192.168.200.204
用浏览器打开 http://192.168.200.202
再次打开一个新的浏览器再次访问 http://192.168.200.202
可以验证两次访问到的结果分别为：
server 192.168.200.202
server 192.168.200.203
3、编译安装keepalived服务
[root@Haproxy-1 ~]# yum -y install kernel-devel openssl-devel popt-devel
[root@Haproxy-1 ~]# tar xf keepalived-1.2.13.tar.gz
[root@Haproxy-1 ~]# cd keepalived-1.2.13
[root@Haproxy-1 keepalived-1.2.13]# ./configure --prefix=/ --with-kernel-dir=/usr/src/kernels/2.6.18-194.el5-i686 && make && make install
3.1 配置keepalibed 开机启动脚本
[root@Haproxy-1 ~]# chkconfig --add keepalived
[root@Haproxy-1 ~]# chkconfig keepalived on
[root@Haproxy-1 ~]# chkconfig --list keepalived
[root@Haproxy-1 ~]# service keepalived start|stop
3.2.1 配置keepalibed 主配置文件
[root@Haproxy-1 ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
vrrp_script chk_http_port {
script "/etc/keepalived/check_haproxy.sh"
interval 2
weight 2
global_defs {
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
chk_http_port
}
virtual_ipaddress {
192.168.200.254
}
}
}
3.2.2 第二台Haproxy配置keepalibed 主配置文件
[root@Haproxy-2 ~]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
vrrp_script chk_http_port {
script "/etc/keepalived/check_haproxy.sh"
interval 2
weight 2
global_defs {
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 50
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
chk_http_port
}
virtual_ipaddress {
192.168.200.254
}
}
}
4、两台机器上都配置haproxy检测脚本
[root@Haproxy-1 ~]# cat /etc/keepalived/check_haproxy.sh
#!/bin/bash
A=`ps -C haproxy --no-header |wc -l`
if [ $A -eq 0 ]
then
/usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/conf/haproxy.cfg
sleep 3
if [ `ps -C haproxy --no-header |wc -l` -eq 0 ]
then
/etc/init.d/keepalived stop
fi
fi
[root@Haproxy-1 ~]# chmod +x /etc/keepalived/check_haproxy.sh
[root@Haproxy-1 ~]# service keepalived start
[root@Haproxy-2 ~]# service keepalived start
5.1、测试VIP地址
[root@Haproxy-1 ~]# ip addr show dev eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:cc:18:a2 brd ff:ff:ff:ff:ff:ff
inet 192.168.200.201/24 brd 192.168.200.255 scope global eth0
inet 192.168.200.254/32 scope global eth0
inet6 fe80::20c:29ff:fecc:18a2/64 scope link
valid_lft forever preferred_lft forever
[root@Haproxy-1 ~]# /etc/init.d/keepalived stop
停止 keepalived： [确定]
[root@Haproxy-2 ~]# ip addr show dev eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:fd:8a:4e brd ff:ff:ff:ff:ff:ff
inet 192.168.200.204/24 brd 192.168.200.255 scope global eth0
inet 192.168.200.254/32 scope global eth0
inet6 fe80::20c:29ff:fefd:8a4e/64 scope link
valid_lft forever preferred_lft forever
5.2、测试Haproxy健康检查
[root@Haproxy-1 ~]# service haproxy stop
Shutting down haproxy: [确定]
[root@Haproxy-1 ~]# service haproxy status
haproxy (pid 59717) 正在运行...
5.3 网页测试：
用浏览器打开 http://192.168.200.254
再次打开一个新的浏览器再次访问 http://192.168.200.254
可以验证两次访问到的结果分别为：
server 192.168.200.202
server 192.168.200.203
END
本文出自 “微清凉风的博客” 博客，请务必保留此出处http://amunlinux.blog.51cto.com/13112118/1950265
Haproxy + keepalived 高可用负载均衡解决方案