haproxy+keepalived实现高可用负载均衡-阿里云开发者社区

haproxy+keepalived实现高可用负载均衡

2012-10-26 814

版权

本文内容由阿里云实名注册用户自发贡献，版权归原作者所有，阿里云开发者社区不拥有其著作权，亦不承担相应法律责任。具体规则请查看《阿里云开发者社区用户服务协议》和《阿里云开发者社区知识产权保护指引》。如果您发现本社区中有涉嫌抄袭的内容，填写侵权投诉表单进行举报，一经查实，本社区将立刻删除涉嫌侵权内容。

简介： 环境四台机器都是RedHat4.8（64位）版本： IP地址用处 192.168.5.55 MASTER 192.

环境四台机器都是RedHat4.8（64位）版本：

IP地址用处

192.168.5.55 MASTER

192.168.2.73 BACKUP

192.168.5.54 负载A

192.168.5.57 负载B

192.168.2.100 VIP

1、MASTER上安装haproxy

wget http://haproxy.1wt.eu/download/1.3/src/haproxy-1.3.20.tar.gz /root

解压到当前目录

tar zxvf haproxy-1.3.20.tar.gz

进到此目录

cd haproxy-1.3.20

编译及安装，安装到/usr/local目录，但是安装完此目录下没有haproxy文件夹，我也很奇怪！

make TARGET=linux26 prefix=/usr/local/haproxy install

但是出来的结果会提示如下信息

install -d /usr/local/sbin
install haproxy /usr/local/sbin
install -d /usr/local/share/man/man1
install -m 644 doc/haproxy.1 /usr/local/share/man/man1
install -d /usr/local/doc/haproxy
for x in configuration architecture haproxy-en haproxy-fr; do \
install -m 644 doc/$x.txt /usr/local/doc/haproxy ; \
done
提示你启动haproxy在sbin目录，其余的在doc目录

进入到haproxy目录

cd /usr/local/doc/haproxy

新建一个haproxy主配置文件

vi haproxy.cfg

global
   log 127.0.0.1 local0
   maxconn 4096
   chroot /usr/local/doc/haproxy
   uid 501
   gid 501
   daemon
   nbproc 1
   pidfile /usr/local/doc/haproxy/haproxy.pid
defaults
   log    127.0.0.1 local3
   mode   http
   option httplog
   option httpclose
   option dontlognull
   option forwardfor
   option redispatch
   retries 2
   maxconn 2000
   balance roundrobin
   stats   uri    /haproxy-status    查看状态
   stats hide-version       隐藏haproxy版本
   stats realm Gemini\ Haproxy      查看状态需要口令
   stats auth admin:admin           用户名和密码
   contimeout 5000
   clitimeout 50000
   srvtimeout 50000
listen web_proxy 192.168.2.100:80
   server web1 192.168.5.54:8080 cookie app1inst1 check inter 2000 rise 2 fall 5
   server web2 192.168.5.57:8080 cookie app1inst2 check inter 2000 rise 2 fall 5

2、MASTER安装keepalived

tar zxvf keepalived-1.1.15.tar.gz

vi /usr/src/kernels/2.6.9-89.EL-smp-x86_64/include/linux/types.h

将如下两行注释掉，否则编译会出错，跟我这个版本的系统有关系，你的也许不要！

/*
typedef __u16 __bitwise __sum16;
typedef __u32 __bitwise __wsum;
*/

cd keepalived-1.1.15

./configure

make

make install

将keepalived作为系统服务启动

cp /usr/local/etc/rc.d/init.d/keepalived /etc/init.d/
cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
mkdir /etc/keepalived/
cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/sbin/keepalived /usr/sbin/

vi /etc/keepalived/keepalived.conf内容如下：

! Configuration File for keepalived
global_defs {
   router_id LVA_DEVEL
}
vrrp_script chk_http_port {
   script "/root/check_haproxy.sh"
   interval 2
   weight 2
}
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 {
        192.168.2.100
    }
}
上面调用了一个脚本check_haproxy.sh，内容如下：

#!/bin/bash
A=`ps -C haproxy --no-header | wc -l`
if [ $A -eq 0 ];then
/usr/local/sbin/haproxy -f /usr/local/doc/haproxy/haproxy.cfg
echo "haproxy start"
sleep 3
if [ `ps -C haproxy --no-header | wc -l` -eq 0 ];then
/etc/init.d/keepalived stop
echo "keepalived stop"
fi
fi
3、BACKUP上安装haproxy，步骤就不详细介绍，和MASTER上面一样的。

haproxy.conf内容如下

global
   log 127.0.0.1 local0
   maxconn 4096
   chroot /usr/local/doc/haproxy
   uid 501
   gid 501
   daemon
   nbproc 1
   pidfile /usr/local/doc/haproxy/haproxy.pid
defaults
   log    127.0.0.1 local3
   mode   http
   option httplog
   option httpclose
   option dontlognull
   option forwardfor
   option redispatch
   retries 2
   maxconn 2000
   balance roundrobin
   stats   uri    /haproxy-status
   stats hide-version
   stats realm Gemini\ Haproxy
   stats auth admin:admin
   contimeout 5000
   clitimeout 50000
   srvtimeout 50000
listen web_proxy 192.168.2.100:80
   server web1 192.168.5.54:8080 cookie app1inst1 check inter 2000 rise 2 fall 5
   server web2 192.168.5.57:8080 cookie app1inst2 check inter 2000 rise 2 fall 5
4、BACKUP上安装keepalived，步骤也不多介绍，keepalived.conf文件内容就两处有变化，红色字体标出

! Configuration File for keepalived
global_defs {
   router_id LVA_DEVEL
}
vrrp_script chk_http_port {
   script "/root/check_haproxy.sh"
   interval 2
   weight 2
}
vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 51
    priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
track_script {
    chk_http_port
}
    virtual_ipaddress {
        192.168.2.100
    }
}
调用脚本check_haproxy.sh内容：

#!/bin/bash
A=`ip a | grep 192.168.2.100 | wc -l`
B=`ps -ef | grep haproxy | grep -v grep | awk '{print $2}'`
if [ $A -gt 0 ];then
/usr/local/sbin/haproxy -f /usr/local/doc/haproxy/haproxy.cfg
else
kill -9 $B
fi
5、两台负载机器我就不多介绍了，用的是系统自带的apache

登录192.168.5.54上操作：

echo 'this is 192.168.5.54!' > /var/www/html/index.html

修改/etc/httpd/conf/httpd.conf文件的监听端口为8080

sed -i 's/Listen 80/Listen 8080/g' /etc/httpd/conf/httpd.conf

/etc/init.d/httpd start

登录192.168.5.57上操作：

echo 'Hello,This is 192.168.5.57!' > /var/www/html/index.html

修改/etc/httpd/conf/httpd.conf文件的监听端口为8080

sed -i 's/Listen 80/Listen 8080/g' /etc/httpd/conf/httpd.conf

/etc/init.d/httpd start

6、测试步骤

启动MASTER上的keepalived服务，再启动BACKUP上的keepalived服务。

确定MASTER上是否有192.168.2.100地址，用ip a查看即可！

然后手动杀掉MASTER上的haproxy进程，看看是否能马上恢复进程？

停止MASTER上的keepalived服务，确认BACKUP是否接管VIP地址？

最后再启动MASTER上的keepalived服务，再确认MASTER是否再接管VIP地址？

总结：我这测试都没问题，如果有问题请给我留言！

haproxy+keepalived实现高可用负载均衡

热门文章

最新文章

相关课程

相关电子书

相关实验场景