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基于Haproxy+Keepalived构建高可用负载均衡集群
实验环境：
|
主机名 |
IP地址 |
|
VIP |
192.168.200.254 |
|
Haproxy-1 |
192.168.200.101 |
|
Haproxy-2 |
192.168.200.102 |
|
Nginx1 |
192.168.200.103 |
|
Nginx2 |
192.168.200.104 |
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 gcc gcc-c++ make 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 192.168.200.103" > 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 192.168.200.104" > index.html
2、安装Haproxy-1与Haproxy-2 两台机器配置一致：
[root@Haproxy-1 ~]# yum -y install gcc gcc-c++ make 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
2.1 Haproxy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 192.168.200.103:80 check inter 2000 fall 3 server inst2 192.168.200.104:80 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 客户端访问测试：
用浏览器打开 http://192.168.200.101 打开一个新的浏览器再次访问 http://192.168.200.101
用浏览器打开 http://192.168.200.102 打开一个新的浏览器再次访问 http://192.168.200.102
可以验证两次访问到的结果分别为：
server 192.168.200.103
server 192.168.200.104
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
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
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 num=`ps -C haproxy --no-header |wc -l` if [ $num -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 192.168.200.101/24 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 192.168.200.102/24 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 192.168.200.103
server 192.168.200.104
基于Haproxy+Keepalived构建高可用负载均衡集群
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