keepalived实现lvs的主备

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#调度器的主备 #keepalived #lvs

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本文介绍如何使用 LVS 和 Keepalived 在 Redhat 7.5 上搭建高可用的负载均衡系统。通过配置主备调度器，当主调度器故障时，备用调度器会立即接管，确保服务连续性。实验覆盖了从软件安装到配置及测试的全过程。

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引言：
ldirectord + lvs实现服务器的高可用之后，我们仍需考虑到，如果lvs调度器故障，我们有应该如何确保服务的正常访问呢？所以出现了lvs调度器的主备，使用两台调度器(一主一备)当主调度器故障，立即器用启用备用调度器，使访问不受影响。

实验环境：
redhat 7.5

server1(lvs-主)	172.25.60.1/24
server4(lvs-备)	172.25.60.4/24
server2(apache)	172.25.60.2/24
server3(apache)	172.25.60.3/24

配置：
(1)server1/4上安装keepalived并配置
server1： 主

keepalived-2.0.17.tar.gz 自己下载压缩包 
tar -zxf keepalived-2.0.17.tar.gz 
yum install gcc openssl-devel 安装源码编译所需要的环境 
cd keepalived-2.0.17 
./configure --prefix=/usr/local/keepalived --with-init=systemdls
make && make install
ln -s /usr/local/keepalived/etc/keepalived/ /etc/
vim /etc/keepalived/keepalived.conf	//配置文件如下
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_skip_check_adv_addr
   #vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

vrrp_instance VI_1 {
    state MASTER		//主调度器
    interface eth0
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        172.25.60.100		//vip，启动服务时自动生成
    }
}

virtual_server 172.25.60.100 80 {		
    delay_loop 3
    lb_algo rr			//轮询
    lb_kind DR			//DR模式
    #persistence_timeout 50
    protocol TCP

    real_server 172.25.60.2 80 {	//server2
	TCP_CHECK {
        weight 1
            connect_timeout 3
            retry 3
            delay_before_retry 3
	    }
    }

    real_server 172.25.60.3 80 {	//server3
	TCP_CHECK {
        weight 1
            connect_timeout 3
            retry 3
            delay_before_retry 3
	    }
    }
}

server4： 备

keepalived-2.0.17.tar.gz 自己下载压缩包 
tar -zxf keepalived-2.0.17.tar.gz 
yum install gcc openssl-devel 安装源码编译所需要的环境 
cd keepalived-2.0.17 
./configure --prefix=/usr/local/keepalived --with-init=systemdls 
make && make install
ln -s /usr/local/keepalived/etc/keepalived/ /etc/
vim /etc/keepalived/keepalived.conf	//配置文件如下
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_skip_check_adv_addr
    #vrrp_strict
    vrrp_garp_interval 0
    vrrp_gna_interval 0
    }
vrrp_instance VI_1 {
    state BACKUP		//备
    interface eth0
    virtual_router_id 51
    priority 50			//比主调度器小
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        172.25.60.100
    }
}
virtual_server 172.25.60.100 80 {
    delay_loop 3
    lb_algo rr
    lb_kind DR
    #persistence_timeout 50
    protocol TCP
    
    real_server 172.25.60.2 80 {
	TCP_CHECK {
        weight 1
            connect_timeout 3
            retry 3
            delay_before_retry 3
    	}
    }

    real_server 172.25.60.3 80 {
	TCP_CHECK {
        weight 1
            connect_timeout 3
            retry 3
            delay_before_retry 3
	    }
    }
}

开启keppalived时配置的vip自动在主调度器上生效