【集群】LVS+keepalived高可用集群

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前言

本博客内容仅为记录博主思路，仅供参考，一切以自己实践结果为准。

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一、LVS+keepalived

1.0 架构概况

作用	IP地址	安装服务
主负载均衡器	192.168.13.10	ipvsadm/keepalived
节点服务器1	192.168.13.20	httpd
节点服务器2	192.168.13.30	httpd
备用负载均衡器	192.168.13.40	ipvsadm/keepalived

1.2 节点服务器

yum install -y httpd
cd /etc/sysconfig/network-scripts/
cp ifcfg-lo ifcfg-lo:0
vim ifcfg-lo:0
	DEVICE=lo:0
	IPADDR=192.168.13.100
	NETMASK=255.255.255.255
	ONBOOT=yes

vim /etc/rc.local
	route add -host 192.168.13.100 dev lo:0
chmod +x /etc/rc.d/rc.local
vim /etc/sysctl.conf
	net.ipv4.conf.lo.arp_ignore = 1 
	net.ipv4.conf.lo.arp_announce = 2
	net.ipv4.conf.all.arp_ignore = 1
	net.ipv4.conf.all.arp_announce = 2
sysctl -p
echo '<h1>This is the first test web1!</h1>' > /var/www/html/index.html
systemctl start httpd

#另一个节点服务器重复此操作

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1.2 主负载均衡服务器

yum install -y ipvsadm keepalived
cd /etc/keepalived
vim keepalived.conf
	10行：smtp_server 127.0.0.1
	12行：router_id LVS_01
	13-16行：删除
	
#vrrp热备份模块#
	17行：interface ens33
	19行（priority 100上方插入）：nopreempt
	27行：192.168.13.100
	28-29行：删除
	
#virtual虚拟服务器模块#
	31行：192.168.13.100 80
	34行：lb_kind DR
	35行：persistence_timeout 0
	36行：protocol TCP
	
	38行：real_server 192.168.13.20 80 {
    
	39行：weight 1
	40行：TCP_CHECK {
    
	41行：connect_port 80
	42行：connect_timeout 3
	43行：nb_get_retry 3
	44行：delay_before_retry 3
	45行：}
	46行：}
	
	47-55行：38,46 co 46
	#将上面9行节点服务器配置复制下来，改一下节点服务器IP地址即可
	56行：}
	56行以下：全部删除

systemctl start keepalived
scp keepalived.conf 192.168.13.40:`pwd`
ipvsadm-save > /etc/sysconfig/ipvsadm
systemctl restart keepalived
ipvsadm -ln

1.3 备负载均衡服务器

yum install -y ipvsadm keepalived
cd /etc/keepalived/
vim keepalived.conf
	12行：router_id LVS_02
	16行：state BACKUP
	20行：priority 90
systemctl start keepalived
ipvsadm-save > /etc/sysconfig/ipvsadm
systemctl start ipvsadm
systemctl restart keepalived
ipvsadm -ln

1.4 测试

• 1、网页访问192.168.13.100，产生负载均衡效果
• 2、主负载：systemctl stop keepalived，VIP地址跳到备用负载均衡器（ip addr查看）

二、负载均衡器配置文件模板

! Configuration File for keepalived

global_defs {
    
   notification_email {
    
     [email protected].loc
     [email protected].loc
     [email protected].loc
   }
   notification_email_from Alexandre.[email protected].loc
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_01
}

vrrp_instance VI_1 {
    
    state MASTER
    interface ens33
    virtual_router_id 51
    nopreempt
    priority 100
    advert_int 1
    authentication {
    
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
    
        192.168.13.100
    }
}

virtual_server 192.168.13.100 80 {
    
    delay_loop 6
    lb_algo rr
    lb_kind DR
    persistence_timeout 0
    protocol TCP

    real_server 192.168.13.20 80 {
    
        weight 1
        TCP_CHECK{
    
        connect_port 80
        connect_timeout 3
        nb_get_retry 3
        delay_before_retry 3
        }
    }
    real_server 192.168.13.30 80 {
    
        weight 1
        TCP_CHECK{
    
        connect_port 80
        connect_timeout 3
        nb_get_retry 3
        delay_before_retry 3
        }
    }

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三、结语

• 心态要好