Graphs not working on Checkmk 2.0 raw

CMK version:
check-mk-raw-2.0.0p16

OS version:
CentOS Linux release 7.9.2009 (Core)
Basically running check-mk-raw-2.0.0p16 on cetos based docker container

Error message:
Grpahs are not working , rrdcached.log is not having any data …it is 0 byte file

Output of “cmk --debug -vvn hostname”: (If it is a problem with checks or plugins)
OMD[nagios]:~$ cmk --debug -vvn hostname
Checkmk version 2.0.0p16
Try license usage history update.
Trying to acquire lock on /omd/sites/nagios/var/check_mk/license_usage/next_run
Got lock on /omd/sites/nagios/var/check_mk/license_usage/next_run
Trying to acquire lock on /omd/sites/nagios/var/check_mk/license_usage/history.json
Got lock on /omd/sites/nagios/var/check_mk/license_usage/history.json
Next run time has not been reached yet. Abort.
Releasing lock on /omd/sites/nagios/var/check_mk/license_usage/history.json
Released lock on /omd/sites/nagios/var/check_mk/license_usage/history.json
Releasing lock on /omd/sites/nagios/var/check_mk/license_usage/next_run
Released lock on /omd/sites/nagios/var/check_mk/license_usage/next_run
Failed to lookup IPv4 address of hostname via DNS: [Errno -2] Name or service not known