利用keepalived实现nginx调度器高可用（一）
利用keepalived实现nginx调度器高可用声明：提供四台主机，其中两台nginx做前端调度器（一台做主调度器，一台做备用调度器），
另外两台主机做web服务器向外提供http服务；
框架如图：
http://s1.运维网.com/images/20180615/1529054212127779.png
1.在两台nginx上配置nginx反代服务
# vim /etc/nginx/nginx.conf
在http上下文中添加下文：
upstream webser {
server 172.16.1.12:80 weight=1;
server 172.16.1.13:80 weight=1;
}
server {
listen 80 default_server;
location / {
proxy_pass http://webser;
}
}
配置完成后，启动nginx服务，使配置生效；
2.配置keepalived+nginx_master(172.16.1.11主机)：(前提，安装keepalived : # yum install keepalived)
# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id drct1
vrrp_mcast_group4 224.0.100.18
}
vrrp_script check_httpd {
script "killall -0 nginx && exit 0 || exit 1"
interval 1
weight -20
}
vrrp_instance VI_1 {
state MASTER
interface ens33
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass cxqLUKJh
}
virtual_ipaddress {
172.16.1.254/16
}
track_script {
check_httpd
}
}
启动keepalived服务：
# systemctl start keepalived.service
3.配置keepalived+nginx_backup(172.16.1.13主机)：
# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id drct2
vrrp_mcast_group4 224.0.100.18
}
vrrp_script check_httpd {
script "killall -0 nginx && exit 0 || exit 1"
interval 1
weight -20
}
vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id 51
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass cxqLUKJh
}
virtual_ipaddress {
172.16.1.254/16
}
track_script {
check_httpd
}
}
配置完成后，启动keepalived服务：
# systemctl start keepalived
4.配置后端web服务器
1）安装httpd
# yum install http
2) 做web页面：
webserver1:
vim /var/www/html/index.html
Real Server 1
webserver2:
vim /var/www/html/index.html
Real Server 2
3) 启动http服务：
# systemctl start httpd
5.用一个客户端测试：
#for i in {1..10}; do curl http://172.16.1.254;done
Real Server 2
Real Server 1
Real Server 2
Real Server 1
Real Server 2
Real Server 1
Real Server 1
Real Server 2
Real Server 1
Real Server 2
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