nginx+keepalived负载均衡及高可用

一、环境准备

主机名	ip地址	备注
openEuler-1	192.168.121.11（本机） 192.168.131.11（心跳连接）	nginx主负载均衡调度器
openEuler-2	192.168.121.12（本机） 192.168.131.12（心跳连接）	nginx-2主负载均衡调度器
openEuler-3	192.168.121.13	web1
openEuler-4	192.168.121.14	web2
Rocky-1	192.168.121.51	client

二、配置nginx反向代理

[root@openEuler-1 ~]# cd /etc/nginx/conf.d/
[root@openEuler-1 conf.d]# vim lb.conf
upstream webs {server 192.168.121.13:80;server 192.168.121.14:80;
}server {location / {proxy_pass http://webs;}
}
[root@openEuler-1 conf.d]# scp lb.conf 192.168.121.12:$PWD# 重启nginx服务

三、配置keepalived

[root@openEuler-1 conf.d]# cd /etc/keepalived/
[root@openEuler-1 keepalived]# vim keepalived.conf
! Configuration File for keepalivedglobal_defs {router_id LVS_1
}vrrp_script check_nginx {script "killall -0 nginx"
}vrrp_instance VI_1 {state MASTERinterface ens160lvs_sync_daemon_interface ens192virtual_router_id 51priority 100advert_int 1authentication {auth_type PASSauth_pass 1111}track_script {check_nginx}virtual_ipaddress {192.168.121.10}
}# 副负载均衡调度器上稍作修改
[root@openEuler-1 keepalived]# scp keepalived.conf 192.168.121.12:$PWD
修改为；
! Configuration File for keepalivedglobal_defs {router_id LVS_2
}vrrp_script check_nginx {script "killall -0 nginx"
}vrrp_instance VI_1 {state BACKUPinterface ens160lvs_sync_daemon_interface ens192virtual_router_id 51priority 80advert_int 1authentication {auth_type PASSauth_pass 1111}track_script {check_nginx}virtual_ipaddress {192.168.121.10}
}# 两台调度器都重启keepalived服务

四、测试

# 关闭nginx主负载调度器
[root@openEuler-1 ~]# systemctl stop nginx.service# 副负载调度器接管服务
[root@openEuler-2 ~]# tail -f /var/log/messages
Mar  2 16:25:16 openEuler-2 Keepalived_vrrp[3078]: Sending gratuitous ARP on ens160 for 192.168.121.10
Mar  2 16:25:16 openEuler-2 Keepalived_vrrp[3078]: Sending gratuitous ARP on ens160 for 192.168.121.10
Mar  2 16:25:16 openEuler-2 kernel: [ 9964.205163] IPVS: stopping backup sync thread 3081 ...
Mar  2 16:25:16 openEuler-2 kernel: [ 9964.208213] IPVS: sync thread started: state = MASTER, mcast_ifn = ens192, syncid = 0, id = 0
Mar  2 16:25:21 openEuler-2 Keepalived_vrrp[3078]: (VI_1) Sending/queueing gratuitous ARPs on ens160 for 192.168.121.10
Mar  2 16:25:21 openEuler-2 Keepalived_vrrp[3078]: Sending gratuitous ARP on ens160 for 192.168.121.10
Mar  2 16:25:21 openEuler-2 Keepalived_vrrp[3078]: Sending gratuitous ARP on ens160 for 192.168.121.10
Mar  2 16:25:21 openEuler-2 Keepalived_vrrp[3078]: Sending gratuitous ARP on ens160 for 192.168.121.10
Mar  2 16:25:21 openEuler-2 Keepalived_vrrp[3078]: Sending gratuitous ARP on ens160 for 192.168.121.10
Mar  2 16:25:21 openEuler-2 Keepalived_vrrp[3078]: Sending gratuitous ARP on ens160 for 192.168.121.10