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Management of the Virtual IP address will be handled with keepalived.

Keepalived

keepalived is to be configured on both machines.

keepalived seems to support HTTP status checks.

The following is roughly the configuration for sca-nginx01. The configuration for sca-nginx02, which will be the failover machine, will be nearly identical, but the priority on the vrrp_instance MUST BE LOWER than the priority on the master. The password will be different.

The configuration is located in /etc/keepalived/keepalived.conf

global_defs {
   notification_email {
     bvan@slac.stanford.edu
   }
   notification_email_from sca-nginx01@slac.stanford.edu
   smtp_server localhost
   smtp_connect_timeout 30
}
vrrp_instance VI_1 {
    state MASTER
    interface eth1
    virtual_router_id 85
    priority 10
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        134.79.129.86
    }
}