LVS-DR+ KeepAlived负载均衡高可用配置
（一）lvs负载均衡详解--lvs-DR模式配置_W1124824402的博客-CSDN博客
（二）lvs负载均衡详解--lvs-NAT模式配置_W1124824402的博客-CSDN博客
（四）lvs负载均衡详解--mysql+keepalived配置，yum下载mysql详解、mysql集群高可用_W1124824402的博客-CSDN博客
KeepAlived在该项目中的功能：
1. 管理IPVS的路由表（包括对RealServer做健康检查）
2. 实现调度器的HA(高可用)
Keepalived所执行的外部脚本命令建议使用绝对路径
主/备调度器安装软件
192.168.11.208-master yum -y install ipvsadm keepalived
192.168.11.192-slave yum -y install ipvsadm keepalived
两台nginx用来测试效果
192.168.11.193-nginx
192.168.11.194-nginx
192.168.11.208-master 操作
vim /etc/keepalived/keepalived.conf 修改为以下内容建议直接dG
! 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 {
192.168.11.222/24 #keepalived抢占设置的vip
}
}
virtual_server 192.168.11.22280 { #LVS配置
delay_loop 3 #启动3个进程cpu有几个设置几个最佳
lb_algo rr #LVS调度算法轮询
lb_kind DR #LVS集群模式（路由模式）
nat_mask 255.255.255.0
protocol TCP #健康检查使用的协议
real_server 192.168.11.19380 { #nignx节点ip
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 192.168.11.19480 { #nginx节点ip
weight 1
inhibit_on_failure
TCP_CHECK {
connect_timeout 3
connect_port 80
}
}
}
192.168.11.192-slave 操作
vim /etc/keepalived/keepalived.conf修改为以下内容建议直接dG
! 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 #从节点优先级设置为50就行
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.11.222/24
}
}
virtual_server 192.168.11.22280 {
delay_loop 3
lb_algo rr
lb_kind DR
nat_mask 255.255.255.0
protocol TCP
real_server 192.168.11.19380 {
weight 1
inhibit_on_failure
TCP_CHECK {
connect_port 80
connect_timeout 3
}
}
real_server 192.168.11.19480 {
weight 1
inhibit_on_failure
TCP_CHECK {
connect_port 80
connect_timeout 3
}
}
}
启动KeepAlived（主备均启动）
systemctl start keepalivedsystemctl enable keepalived
启动以后查看一下 ipvsadm -Ln
配置好以后可以看一下是否会进行vip漂移，漂移成功测部署成功
关掉主节点的keepalvied
Systemctl stop keepalived
然后在配置两台nginx服务器用来测试
192.168.11.193-nginx yum install -y nginx
192.168.11.194-nginx yum install -y nginx
在192.168.11.193-nginx 操作
ip addr add dev lo 192.168.11.222/32
echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore #忽略arp广播
echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce #匹配精确ip地址回包
echo "" >> /usr/share/nginx/html/index.html
systemctl start nginx
在 192.168.11.194-nginx 操作
ip addr add dev lo 192.168.11.222/32
echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore #忽略arp广播
echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce #匹配精确ip地址回包
echo "" >> /usr/share/nginx/html/index.html
systemctl start nginx
然后访问配置的vip看一下结果
192.168.11.222 为了能够查看测试效果nginx的长链接记得修改为0 两台nginx都操作
可以访问到两个则配置成功，如果访问没有变化 看一下是不是修改了长链接，重启nignx
