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利用keepalived實現nginx調度器高可用

聲明：提供四臺主機，其中兩臺nginx做前端調度器（一臺做主調度器，一臺做備用調度器），

另外兩臺主機做web服務器向外提供http服務；

框架如圖：

1.在兩臺nginx上配置nginx反代服務

# 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;
}

}

配置完成後，啟動nginx服務，使配置生效；

2.配置keepalived+nginx_master(172.16.1.11主機)：(前提，安裝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 BACKUP
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
}
}

啟動keepalived服務：

# systemctl start keepalived.service

3.配置keepalived+nginx_backup(172.16.1.13主機)：

# 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
}
}

配置完成後，啟動keepalived服務：

# systemctl start keepalived

4.配置後端web服務器

1）安裝httpd

# yum install http

2) 做web頁面：

webserver1:

vim /var/www/html/index.html

Real Server 1

webserver2:

vim /var/www/html/index.html

Real Server 2

3) 啟動http服務：

# systemctl start httpd

5.用一個客戶端測試：

# 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

利用keepalived實現nginx調度器高可用（一）