Nginx+keepalived做双机热备-keepalived安装

一、环境说明

keepalived-1.1.19.tar.gz

popt-1.16.tar.gz

二、环境配置

1、主Keepalived服务器IP地址 192.168.2.31

2、备Keepalived服务器IP地址 192.168.2.32

3、Keepalived虚拟IP地址 192.168.2.200

三、软件下载地址

wget http://keepalived.org/software/keepalived-1.1.19.tar.gz
wget http://rpm5.org/files/popt/popt-1.16.tar.gz
四、安装流程

在master和backup分别查看是否有ipvsadm软件

1. 检查ipvsadm是否安装成功.可以直接输入

[root@localhost ~]# ipvsadm

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

-> RemoteAddress:Port Forward Weight ActiveConn InActConn



2. 检查模版是否加入内核

[root@localhost ~]# lsmod |grep ip_vs

ip_vs 78081 0





1. 安装popt

cd /usr/local/src

编译keepalived时需要popt，否则会报以下错误：

configure: error: Popt libraries is required

tar -zxvf popt-1.16.tar.gz

cd popt-1.16

./configure

make

make install

2.安装keepalived

tar -zxvf keepalived-1.1.19.tar.gz

cd keepalived-1.1.19

./configure --prefix=/usr/local/keepalived

make

make install

安装keepalived出现错误：

checking openssl/ssl.h usability... no

checking openssl/ssl.h presence... no

checking for openssl/ssl.h... no

configure: error:

!!! OpenSSL is not properly installed on your system. !!!

!!! Can not include OpenSSL headers files. !!!

解决方案：

yum -y install openssl-devel

./configure

make

make install

再次执行就ok。



4.修改配置文件路径

[root@master ~]# cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/

[root@master ~]# cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/

[root@master ~]# mkdir /etc/keepalived

[root@master ~]# cp /usr/local/sbin/keepalived /usr/sbin/

[root@master ~]# vi /etc/keepalived/keepalived.conf

vi /etc/keepalived/keepalived.conf

! Configuration File for keepalived



global_defs {

notification_email {

shenfuli0712@126.com

}

notification_email_from shenfuli0712@126.com

smtp_server smtp.126.com

#smtp_connect_timeout 30

router_id LVS_DEVEL

}



# VIP1

vrrp_instance VI_1 {

state MASTER #备份服务器上将MASTER改为BACKUP

interface eth3 #绑定虚拟IP的网络接口

lvs_sync_daemon_inteface eth3 #(HA监测网络接口)

virtual_router_id 51#(主、备机的virtual_router_id必须相同)

priority 100 # 备份服务上将100改为90

advert_int 5 #组播信息发送间隔，两个节点设置必须一样

authentication {#设置验证信息，两个节点必须一致

auth_type PASS#(VRRP认证方式)

auth_pass 1111#(密码)

}

virtual_ipaddress { #指定虚拟IP, 两个节点设置必须一样

192.168.2.200

#(如果有多个VIP，继续换行填写.)

}

}



virtual_server 192.168.2.200 8081 {

delay_loop 6 #(每隔6秒查询realserver状态)

lb_algo wlc #(lvs 算法)

lb_kind DR #(Direct Route)

persistence_timeout 60 #(同一IP的连接60秒内被分配到同一台realserver)

protocol TCP #(用TCP协议检查realserver状态)



#nginx_1

real_server 192.168.2.31 8081 {

weight 100 #(权重)

TCP_CHECK {

connect_timeout 10 #(10秒无响应超时)

nb_get_retry 3

delay_before_retry 3

connect_port 8081

}

}

#nginx_2

real_server 192.168.2.32 8081 {

weight 100

TCP_CHECK {

connect_timeout 10

nb_get_retry 3

delay_before_retry 3

connect_port 8081

}

}

}

[root@master ~]# service keepalived start|stop

[root@master ~]# chkconfig –level 2345 keepalived on

五、配置realserver -在Nginx1和Nginx2主机上配置LVS-DR的相关配置.

vi /root/lvs_real.sh

#!/bin/bash

# description: Config realserver

#Written by : shenfl

SNS_VIP=192.168.2.200



/etc/rc.d/init.d/functions



case "$1" in

start)

/sbin/ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP

/sbin/route add -host $SNS_VIP dev lo:0

echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore

echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce

echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore

echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce

sysctl -p >/dev/null 2>&1

echo "RealServer Start OK"



;;

stop)

/sbin/ifconfig lo:0 down

/sbin/route del $SNS_VIP >/dev/null 2>&1

echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore

echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce

echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore

echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce

echo "RealServer Stoped"

;;

*)

echo "Usage: $0 {start|stop}"

exit 1

esac



exit 0

[root@web_1 ~]# chmod +x /roo/lvs_real.sh

[root@web_1 ~]# /root/lvs_real.sh start

[root@web_1 ~]# ifconfig

#写入/etc/rc.local开机自动启动

[root@web_1 ~]# echo “/root/lvs_real.sh start” >> /etc/rc.local

六、 重启服务

#启动keepalived

service keepalived start





或者

/usr/local/sbin/keepalived -D -f /etc/keepalived/keepalived.conf

具体启动选项可以看手册 -D 产生日志 默认到/vag/log/message -f 指定配置文件

Keepalived默认启动会启动两个进程，一个是vrrp的，另一个就是healthcheck

#启动vip绑定具体的网卡

/root/lvs_real.sh start

七、 测试LVS+keepalived是否可以负载均衡

安装ipvsadm只是可以看到负载状况.其实只需要keepalived也可以实现负载均衡集群.

#! /bin/sh

for((i=1;i<=100;i++));do

curl http://192.168.2.200:8081 >> /tmp/q;

done

参考资料：
http://kerry.blog.51cto.com/172631/401253/ http://bbs.nanjimao.com/thread-855-1-1.html http://blog.csdn.net/m582445672/article/details/7670015 http://wangyu.iteye.com/blog/424057 http://www.linuxidc.com/Linux/2014-02/97116.htm http://blog.sina.com.cn/s/blog_6dbc8a680100u1s7.html http://zhangxugg-163-com.iteye.com/blog/1665419 http://bbs.chinaunix.net/thread-4137355-1-1.html