keepalived+lvs

最新推荐文章于 2025-12-03 10:56:30 发布

原创最新推荐文章于 2025-12-03 10:56:30 发布 · 177 阅读

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文章标签：

#keepalived #lvs #master #backup

本文详细介绍了如何在RHEL 6.5环境下搭建基于Keepalived和IPVS的高可用负载均衡系统。包括HTTP服务安装、ARP响应禁用、Keepalived及IPVS配置等步骤，并通过实际案例演示了故障转移的过程。

环境：

hostname	角色	release	IP	Iptables and firewalld
server1	Master	rhel6.5	172.25.37.1/24	Disabled
server2	Web1	rhel6.5	172.25.37.2/24	Disabled
server3	Web2	rhel6.5	172.25.37.3/24	Disbaled
server4	BackUp	rhel6.5	172.25.37.4/24	Disavled

【1】在server2和server3上面安装httpd服务。

[root@server2 ~]# yum install -y httpd

[root@server2 ~]# /etc/init.d/httpd start

[root@server2 ~]# echo "<h1> server2 </h1>" > /var/www/html/index.html

测试：

[root@server3 ~]# yum install -y httpd

[root@server3 ~]# /etc/init.d/httpd start

[root@server3 ~]# echo "<h1> server3 </h1>" > /var/www/html/index.html

测试：

【2】在server2和server3上面禁用arp对虚拟IP的响应

[root@server2 ~]# yum install -y arptables_jf

[root@server2 ~]# arptables -A IN -d 172.25.37.100 -j DROP

[root@server2 ~]# arptables -A OUT -s 172.25.37.100 -j mangle --mangle-ip-s 172.25.37.2

[root@server2 ~]# /etc/init.d/arptables_jf save

Saving current rules to /etc/sysconfig/arptables: [ OK ]

[root@server2 ~]# ip addr add 172.25.37.100 dev eth0

[root@server3 ~]# yum install -y arptables_jf

[root@server3 ~]# arptables -A IN -d 172.25.37.100 -j DROP

[root@server3 ~]# arptables -A OUT -s 172.25.37.100 -j mangle --mangle-ip-s 172.25.37.3

[root@server3 ~]# /etc/init.d/arptables_jf save

Saving current rules to /etc/sysconfig/arptables: [ OK ]

[root@server3 ~]# ip addr add 172.25.37.100 dev eth0

【3】在server1上面安装keepalived和ipvsadm

[root@server1 ~]# yum install -y keepalived ipvsadm

[root@server1 ~]# cat /etc/keepalived/keepalived.conf 
! Configuration File for keepalived

global_defs {
   notification_email {
	root@localhost
   }
   notification_email_from root@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 150
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        172.25.37.100
    }
}

virtual_server 172.25.37.100 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    nat_mask 255.255.255.0
    persistence_timeout 50
    protocol TCP

    real_server 172.25.37.2 80 {
        weight 1
        TCP_CHECK {
	    connect_port 80
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
    real_server 172.25.37.3 80 {
        weight 1
        TCP_CHECK {
	    connect_port 80
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}

[root@server1 ~]# /etc/init.d/keepalived start

[root@server1 ~]# ipvsadm -Ln

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

-> RemoteAddress:Port Forward Weight ActiveConn InActConn

TCP 172.25.37.100:80 rr persistent 50

-> 172.25.37.2:80 Route 1 0 0

-> 172.25.37.3:80 Route 1 0 0