@martin.schwarz thank you for your answer, in our checks folder we have only own checks so thats why I asked if I should copy something there… until know I copy only mysql from check_mk to the checks folder on the server.
When I run that I get:
OMD[mysite]:~$ cmk -n -vv --no-cache --checks mysql,mysql_ping,mysql_sessions -II serverdm
Discovering services on: serverdm
serverdm:
Unknown plugin file mysql_sessions
Unknown plugin file mysql_sessions
+ FETCHING DATA
[agent] No persisted sections loaded
[agent] Not using cache (Cache usage disabled)
[agent] Execute data source
[agent] Connecting via TCP to 172.31.0.28:6556 (5.0s timeout)
[agent] ERROR: Communication failed: [Errno 113] No route to host
[piggyback] No persisted sections loaded
[piggyback] Execute data source
No piggyback files for 'serverdm'. Skip processing.
No piggyback files for '172.31.0.28'. Skip processing.
Loading autochecks from /omd/sites/mysite/var/check_mk/autochecks/serverdm.mk
+ EXECUTING DISCOVERY PLUGINS (3)
Trying discovery with: mysql, mysql_ping, mysql_sessions
Try aquire lock on /omd/sites/mysite/var/check_mk/autochecks/serverdm.mk
Got lock on /omd/sites/mysite/var/check_mk/autochecks/serverdm.mk
Releasing lock on /omd/sites/mysite/var/check_mk/autochecks/serverdm.mk
Released lock on /omd/sites/mysite/var/check_mk/autochecks/serverdm.mk
SUCCESS - Found no services, no host labels