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高可用载均衡之LVS+Keepalived

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高可用负载均衡之 LVS+Keepalived

 

一、LVS+Keepalived 介绍:

LVSLinux Virtual Server 的简称,也就是 Linux 虚拟服务器,通过 LVS 提供的负载均衡技术和 Linux 操作系统实现一个高性能、高可用的服务器群集,它具有良好可靠性、可扩展性和可操作性。从而以低廉的成本实现最优的服务性能。

 

Keepalived就是一个类似于 3~5 层交换机制的软件,具有 3~5 层交换功能,其主要作用是检测 web 服务器的健康状态,如果某台 web 服务器故障,Keepalived将检测到并将其从系统中剔除,当该 web 服务器工作正常后 Keepalived 自动将其加入到服务器群中,这些工作全部自动完成,而不需要人工干预,只需要人工修复故障的 web 服务器即可。

 

二、搭建 LVS(DR 模式)+ Keepalived 高可用

1. 服务器 IP 规划:

Master DIP(192.168.126.1) VIP(192.168.126.5)

Backup DIP(192.168.126.2) VIP(192.168.126.5)

RIP (192.168.126.3) VIP(192.168.126.5)

RIP (192.168.126.3) VIP(192.168.126.5)

2.MASTER配置部分:

编译安装LVSMake && make install

报错:make[1]: ***[libipvs.o] Error 1

make: ***[libs] Error 2

决:yum installlibnl*

编译安装Keepalived

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

cp/usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/

cp/usr/local/etc/sysconfig/keepalived /etc/sysconfig/

cp/usr/local/keepalived/sbin/keepalived /usr/sbin/

mkdir /etc/keepalived

cp /usr/local/keepalived/etc/keepalived/keepalived.conf/etc/keepalived/

配置在主负载均衡服务器上配置keepalived.conf
#vi /etc/keepalived/keepalived.conf (
master)
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 101
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.126.132/32 dev eth0 label eth0:0
}
}

virtual_server 192.168.126.132 80 {

delay_loop 6 #(每隔 6 秒查询 realserver 状态)

lb_algo rr #(lvs 算法)

lb_kind DR #(Direct Route)

nat_mask 255.255.255.0 #(同一 IP 的连接 60 秒内被分配到同一台realserver)

protocol TCP #(TCP 协议检查 realserver 状态)

 

real_server 192.168.126.131 80 {

weight 1 #(权重)

HTTP_GET {

url {

path /

status_code 200

}

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

real_server 192.168.126.149 80 {

weight 1

HTTP_GET {

url {

path /

status_code 200

}

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

}

 

ipvsadm–C 清除所有规则

ipvsadm-A -t 192.168.126.1132:80 -s wlc

ipvsadm-a -t 192.168.126.132:80 -r 192.168.126.131 -g -w 2

ipvsadm-a -t 192.168.126.132:80 -r 192.168.126.149 -g -w 1

ipvsadm-L –n 查看规则

ipvsadm–S 保存规则

 

3.BACKUP配置部分:

编译安装LVSMake && make install

报错:make[1]: ***[libipvs.o] Error 1

make: ***[libs] Error 2

决:yum installlibnl*

编译安装Keepalived

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

cp/usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/

cp/usr/local/etc/sysconfig/keepalived /etc/sysconfig/

cp/usr/local/keepalived/sbin/keepalived /usr/sbin/

mkdir /etc/keepalived

cp /usr/local/keepalived/etc/keepalived/keepalived.conf/etc/keepalived/

配置在主负载均衡服务器上配置 keepalived.conf
#vi /etc/keepalived/keepalived.conf (备调
度器Backup)
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.2.170/32 eth0 label eth0:0
}
}

virtual_server 192.168.126.13280 {

delay_loop 6

lb_algo rr

lb_kind DR

nat_mask 255.255.255.0

protocol TCP

 

real_server 192.168.126.131 80 {

weight 1

HTTP_GET {

url {

path /

status_code 200

}

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

real_server 192.168.126.149 80 {

weight 1

HTTP_GET {

url {

path /

status_code 200

}

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

}

 

ipvsadm–C 清除所有规则

ipvsadm -A -t 192.168.126.1132:80 -s wlc

ipvsadm -a -t 192.168.126.132:80 -r 192.168.126.131 -g -w 2

ipvsadm -a -t 192.168.126.132:80 -r 192.168.126.149 -g -w 1

ipvsadm -L –n 查看规则

ipvsadm–S 保存规则

 

4.Real-Server1配置部分:

Echo 1 > /proc/sys/net/ipv4/conf/eth0/arp_ignore

Echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore

Echo 2 > /proc/sys/net/ipv4/conf/eth0/arp_arp_announce

Echo 2 > /proc/sys/net/ipv4/conf/all/arp_arp_announce

限定 linux 主机对 arp 广播请求的响应级别,以及向外通告自己的 IP 地址的,通告级别!

配置虚拟IP:

ifconfiglo:0 192.168.100.1(VIP) netmask 255.255.255.255 broadcast 192.168.1.255(广播地址) up

Routeadd –host ip(vip) dev eth0:0

RS上要做路由,要是不做路由响应客户端时会用 eth0 响应,而不是VIP

Service httpd restart

Echo“this isreal-server1”> /var/www/html/index.html

开启路由转发

5.Real-Server2配置部分:

Echo 1 >/proc/sys/net/ipv4/conf/eth0/arp_ignore

Echo 1 >/proc/sys/net/ipv4/conf/all/arp_ignore

Echo 2 > /proc/sys/net/ipv4/conf/eth0/arp_arp_announce

Echo 2 > /proc/sys/net/ipv4/conf/all/arp_arp_announce

限定 linux 主机对 arp 广播请求的响应级别,以及向外通告自己的 IP 地址的,通告级别!

配置虚拟IP:

ifconfiglo:0 192.168.100.1(VIP) netmask 255.255.255.255 broadcast 192.168.1.255(广播地址) up

Routeadd –host ip(vip) dev eth0:0

RS上要做路由,要是不做路由响应客户端时会用 eth0 响应,而不是VIP

Service httpdrestart

Echo“this isreal-server1”> /var/www/html/index.html

开启路由转发

 

 

注意:Rlear-Server限定 linux 主机对 arp 广播请求的响应级别后在配置VIP

Keepalived.conf配置文件定要 copy/etc/目录下

 

 

Keepalived 的详细介绍:请点这里
Keepalived 的下载地址:请点这里

推荐阅读:

CentOS 6.3 下 Haproxy+Keepalived+Apache 配置笔记 http://www.linuxidc.com/Linux/2013-06/85598.htm

Haproxy + KeepAlived 实现 WEB 群集 on CentOS 6 http://www.linuxidc.com/Linux/2012-03/55672.htm

Keepalived+Haproxy 配置高可用负载均衡 http://www.linuxidc.com/Linux/2012-03/56748.htm

Haproxy+Keepalived 构建高可用负载均衡 http://www.linuxidc.com/Linux/2012-03/55880.htm

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