上文已经介绍了lvs和keepalived的基本概念和用法，下面直接做lvs和keepalived来实现高可用负载均衡
配置：
| 主机名 | ip | 系统 | 用途 |
|---|---|---|---|
| client | 172.16.147.1 | mac | 客户端 |
| lvs-keepalived-master | 172.16.147.154 | centos7.5 | 分发器 |
| lvs-keepalived-slave | 172.16.147.155 | centos7.5 | 分发器备 |
| test-nginx1 | 172.16.147.153 | centos7.5 | web1 |
| test-nginx2 | 172.16.147.156 | centos7.5 | web2 |
| vip |
1. 主备调度器安装软件
[root@lvs-keepalived-master ~]# yum -y install ipvsadm keepalived
[root@lvs-keepalived-slave ~]# yum -y install ipvsadm keepalived
2. Keepalived
lvs-master
[root@lvs-keepalived-master ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id lvs-keepalived-master #辅助改为lvs-backup
}
vrrp_instance VI_1 {
state MASTER
interface ens33 #VIP绑定接口
virtual_router_id 80 #VRID 同一组集群，主备一致
priority 100 #本节点优先级，辅助改为50
advert_int 1 #检查间隔，默认为1s
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
172.16.147.101/24 # 可以写多个vip
}
}
virtual_server 172.16.147.101 80 { #LVS配置
delay_loop 3
lb_algo rr #LVS调度算法
lb_kind DR #LVS集群模式（路由模式）
net_mask 255.255.255.0
protocol TCP #健康检查使用的协议
real_server 172.16.147.153 80 {
weight 1
inhibit_on_failure #当该节点失败时，把权重设置为0，而不是从IPVS中删除
TCP_CHECK { #健康检查
connect_port 80 #检查的端口
connect_timeout 3 #连接超时的时间
}
}
real_server 172.16.147.156 80 {
weight 1
inhibit_on_failure
TCP_CHECK {
connect_timeout 3
connect_port 80
}
}
}2. 备用机安装和配置
[root@lvs-keepalived-slave ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id lvs-keepalived-slave
}
vrrp_instance VI_1 {
state BACKUP
interface ens33
nopreempt #不抢占资源
virtual_router_id 80
priority 50
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
172.16.147.101/24
}
}
virtual_server 172.16.147.101 80 {
delay_loop 3
lb_algo rr
lb_kind DR
net_mask 255.255.255.0
protocol TCP
real_server 172.16.147.153 80 {
weight 1
inhibit_on_failure
TCP_CHECK {
connect_port 80
connect_timeout 3
}
}
real_server 172.16.147.156 80 {
weight 1
inhibit_on_failure
TCP_CHECK {
connect_timeout 3
connect_port 80
}
}
}3. 启动KeepAlived
[root@lvs-keepalived-master ~]# systemctl start keepalived
[root@lvs-keepalived-master ~]# systemctl enable keepalived
[root@lvs-keepalived-master ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 172.16.147.101:80 rr persistent 20
-> 172.16.147.153:80 Route 1 0 0
-> 172.16.147.156:80 Route 0 0 04. 所有RS配置(nginx1,nginx2)
[root@test-nginx1 ~]# yum install -y nginx
[root@test-nginx2 ~]# yum install -y nginx
[root@test-nginx1 ~]# echo "ip addr add dev lo 172.16.147.101/32" >> /etc/rc.local
[root@test-nginx1 ~]# echo "net.ipv4.conf.all.arp_ignore = 1" >> /etc/sysctl.conf
[root@test-nginx1 ~]# echo "net.ipv4.conf.all.arp_announce = 2" >> /etc/sysctl.conf
[root@test-nginx1 ~]# sysctl -p
[root@test-nginx1 ~]# echo "web1..." >> /usr/share/nginx/html/index.html
[root@test-nginx1 ~]# systemctl start nginx
[root@test-nginx1 ~]# chmod +x /etc/rc.local上述步骤实现了两台机器的高可用并进行172.16.147.156和172.16.147.153的负载均衡
