What is the default interval value for vrrp_script in RHEL?

Solution In Progress - Updated -

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Issue

  • What is the default interval value for vrrp_script in RHEL?

Resolution

   # Adds a script to be executed periodically. Its exit code will be
   # recorded for all VRRP instances and sync groups which are monitoring it.
   vrrp_script <SCRIPT_NAME> {
       # path of the script to execute
       script <STRING>|<QUOTED-STRING>

       # seconds between script invocations, (default: 1 second)  <<<<<<<<<<<<<<
       interval <INTEGER>

Root Cause

The default interval value for vrrp_script which means how often the script should be run in seconds.

Diagnostic Steps

Default Interval value can be set in /etc/keepalived/keepalived.conf

vrrp_script keepalived_check {
      script "/usr/local/bin/keepalived_check.sh"
      interval 15  <<<<< (Interval set to 15 sec)
      timeout 5
      rise 3
      fall 3
}

vrrp_instance VI_1 {
      state MASTER
      interface eth0
      virtual_router_id 51
      priority 244
      advert_int 1
      authentication {
         auth_type PASS
         auth_pass 12345
      }
      virtual_ipaddress {
         192.168.122.200/24
      }
      track_script {
         keepalived_check
      }
}

For more information please refer man page of keepalived.conf # man keepalived.conf

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