Nginx + Keepalived (with Nginx monitoring script)

Nginx + Keepalived (with Nginx monitoring script)

Install and deploy Keepalived + nginx
 
HOST: IP-> 10.252.3.160 nginx has installed OK (omitted)
SLAVE: IP> 10.252.3.161 nginx has been installed with OK (omitted)
VIP: 10.252.3.162
 
Step 1: Install keepalived together with the master and slave nodes
Yum installkeepalived-y
Step 2: Configure/etc/keepalived. conf
The configuration of host 10.252.3.160 is as follows:
! Configuration File for keepalived
Global_defs {
Notification_email {
Acassen@firewall.loc # mail target address
Failover@firewall.loc
Sysadmin@firewall.loc
}
Notification_email_from root @ nginx2 # source email address
Smtp_server 127.0.0.1 # smtp Server
Smtp_connect_timeout 30
Router_id LVS_DEVEL
}
 
Vrrp_scriptchk_http_port {
Script "/data/script/nginx. sh" # Monitoring Service Progress
Interval 2 # detection interval (Execution interval)
Weight 2
}
 
Vrrp_instanceVI_1 {
State MASTER # What is the difference between the MASTER and slave databases?
Interface eth1 # corresponding Nic
Virtual_router_id 60
Priority 101 # priority, who is the master (the greater the value, the higher the priority)
Advert_int 2
Authentication {# authentication method, and the password must be the same as the Master/Slave Password
Auth_type PASS
Auth_pass 1234
}
 
Track_interface {# monitored Nic. If you only monitor the service, do not enter
Eth1
}
Track_script {# using the script as the monitor chk_http_port is previously filled in
Chk_http_port
}
Virtual_ipaddress {# Switch Mode. Switch virtual IP Address
10.252.3.165/24 dev eth1 label eth1: 1
}
}
========================================================== ==============
Backup Machine configuration: 10.252.3.161
! Configuration File for keepalived
Global_defs {
Notification_email {
Acassen@firewall.loc # mail target address
Failover@firewall.loc
Sysadmin@firewall.loc
}
Notification_email_from root @ nginx2 # source email address
Smtp_server 127.0.0.1 # smtp Server
Smtp_connect_timeout 30
Router_id LVS_DEVEL
}
 
Vrrp_scriptchk_http_port {
Script "/data/script/nginx. sh" # Monitoring Service Progress
Interval 2 # detection interval (Execution interval)
Weight 2
}
 
Vrrp_instanceVI_1 {
State BACKUP # What is the difference between the master and slave databases?
Interface eth1 # corresponding Nic
Virtual_router_id 60
Priority 100 # priority, who is the master (the greater the value, the higher the priority)
Advert_int 2
Authentication {# authentication method, and the password must be the same as the Master/Slave Password
Auth_type PASS
Auth_pass 1234
}
 
Track_interface {# monitored Nic. If you only monitor the service, do not enter
Eth1
}
Track_script {# using the script as the monitor chk_http_port is previously filled in
Chk_http_port
}
Virtual_ipaddress {# Switch Mode. Switch virtual IP Address
10.252.3.165/24 dev eth1 label eth1: 1
}
}
Step 3: Write/data/script/nginx. sh script content
#! /Bin/sh
NginxPidNum = 'ps-C nginx -- no-header | wc-l'
KeepalivedPidNum = 'ps-C keepalived -- no-header | wc-l'
If [$ nginxPidNum-eq 0]; then
Killall keepalived
Elif [$ keepalivedPidNum-eq 0]; then
Service keepalived start
Fi
 
Grant the script permission chmod + x/data/script/nginx. sh
Step 4: Start Master/Slave keepalived
Servicekeepalived start
Ifconfig: Check whether eth1: 1 is up. If it is up, you can test it. No self-debugging is performed.

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