As I understand the idea of having CRIU activated on mod_lsapi is to start initiate lsphp process faster. But I keep seeing CRIU image is automatically deleted every few minutes and I notice that lsphp initiation process for the user that the CRIU images has been deleted is slow. How can I set CRIU images to stay longer?

Below is the setting I made on lsapi.conf:

lsapi_criu On

lsapi_reset_criu_on_apache_restart On

lsapi_backend_initial_start 3

lsapi_terminate_backends_on_exit Off 

lsapi_backend_max_idle 1800

lsapi_with_connection_pool On