increase file handles on ubuntu

How to increase file handles on ubuntu


/etc/security/limits.conf

*               soft    nofile          65536
*               hard    nofile          65536

#notice bottom line
#
# /etc/pam.d/common-session - session-related modules common to all services
#
# This file is included from other service-specific PAM config files,
# and should contain a list of modules that define tasks to be performed
# at the start and end of sessions of *any* kind (both interactive and
# non-interactive).  The default is pam_unix.
#
session required        pam_unix.so
session required        pam_limits.so