CentOS / Redhat Linux: Install Keepalived To Provide IP Failover. Keepalived provides a strong and robust health checking for LVS clusters.
It implements a framework of health checking on multiple layers for server failover, and VRRPv2 stack to handle director failover. How do I install and configure Keepalived for reverse proxy server such as nginx or lighttpd? If your are using a LVS director to loadbalance a server pool in a production environment, you may want to have a robust solution for healthcheck & failover. This will also work with reverse proxy server such as nginx. Our Sample Setup Internet-- | ============= | ISP Router| ============= | | | |eth0 -> 192.168.1.11 (connected to lan) |-lb0==| | |eth1 -> 202.54.1.1 (vip master) | | |eth0 -> 192.168.1.10 (connected to lan) |-lb1==| |eth1 -> 202.54.1.1 (vip backup) Where, lb0 - Linux box directly connected to the Internet via eth1.
You need to install the following softwares on both lb0 and lb1: keepalived for IP failover.iptables to filter trafficnginx or lighttpd revers proxy server. 3: eth1: Handling nginx Failover With KeepAlived. How do configure to release and obtain VIP (virtual IP) when nginx is dead, down or system is rebooted for the kernel upgrades?
Edit /usr/local/etc/keepalived/keepalived.conf and add the following section to check whether nginx is alive or dead: # vi /usr/local/etc/keepalived/keepalived.conf Updated file on both lb0 and lb1: vrrp_script chk_http_port { script "/usr/bin/killall -0 nginx" interval 2 weight 2} vrrp_instance VI_1 { interface eth0 state MASTER virtual_router_id 51 priority 101 authentication { auth_type PASS auth_pass Add-Your-Password-Here } track_script { chk_http_port } virtual_ipaddress { 202.54.1.1/29 dev eth1 }} Save and close the file.
Reload keealived: # /etc/init.d/keepalived restart If nginx died due to any issues keepalived will release master VIP and backup server will become active. When master nginx LB0 comes backs online, the backup LB1 will go down in backup state. CentOS / Redhat: Install nginx As Reverse Proxy Load Balancer. How do I configure nginx as failover reverse proxy load balancer in front of two Apache web servers under CentOS / RHEL 5.x?
Nginx is a Web and Reverse proxy server. Nginx used in front of Apache Web servers. All connections coming from the Internet addressed to one of the Web servers are routed through the nginx proxy server, which may either deal with the request itself or pass the request wholly or partially to the main web servers. Our Sample Setup. For Linux.