​@Martin-05 

apt install postfix bsd-mailx

I believe the doc team is looking into it.

is postfix installed ? 

apt install postfix bsd-mailx

This works, thank you!

Postfix is now installed and sending test message works (echo "Test Postfix" | mail -s "subject" -a "From:centreon-PV" mymail@something.cz).

sudo service postfix status

● postfix.service - Postfix Mail Transport Agent
     Loaded: loaded (/lib/systemd/system/postfix.service; enabled; preset: enab>
     Active: active (exited) since Tue 2024-12-17 12:48:58 CET; 2min 47s ago
       Docs: man:postfix(1)
    Process: 1022 ExecStart=/bin/true (code=exited, status=0/SUCCESS)
   Main PID: 1022 (code=exited, status=0/SUCCESS)
        CPU: 3ms

...but Centreon still shows that the service is not running:

Where could the problem be?

what is the command in centreon ? 

do you have done a ps in the linux server ?

Command:

/usr/lib/centreon/plugins//centreon_linux_snmp.pl --plugin=os::linux::snmp::plugin --mode=processcount --hostname=localhost --snmp-version='2c' --snmp-community='public'  --process-name='master' --process-path='/usr/lib/postfix/sbin/master' --process-args='' --regexp-name --regexp-path --regexp-args --warning='' --critical='1:' 

CRITICAL: Number of current processes running: 0 | 'nbproc'=0;;1:;0;
 

Settings “proc-postfix” contains 
PROCESSPATH = /usr/libexec/postfix/master

but command “ps -ef” shows “/usr/lib/postfix/sbin/master”.

Change PROCESSPATH to “/usr/lib/postfix/sbin/master” do not affect the result.

I think the whole opensource Centreon appliance version 24.10 for VMWare is kind of weird, this version is not available for download now (it was a two weeks ago).

Maybe using

process-path='/usr/lib/postfix/sbin/' 

(not

process-path='/usr/lib/postfix/sbin/master'

)

process-path='/usr/lib/postfix/sbin/' 

process-path='/usr/lib/postfix/sbin/master'

Oh, sure….. I changed it but the result is the same.
 

Check command:

/usr/lib/centreon/plugins//centreon_linux_snmp.pl --plugin=os::linux::snmp::plugin --mode=processcount --hostname=localhost --snmp-version='2c' --snmp-community='public'  --process-name='master' --process-path='/usr/lib/postfix/sbin/' --process-args='' --regexp-name --regexp-path --regexp-args --warning='' --critical='1:1'

CRITICAL: Number of current processes running: 0 | 'nbproc'=0;;1:1;0;
 

try --debug and snmpwalk to .1.3.6.1.2.1.25.4.2.1

or around there? 

https://github.com/centreon/centreon-plugins/blob/develop/src/snmp_standard/mode/processcount.pm#L130

Adding --debug to the check command didn't show anything extra.

I'm sorry, but I don't know what to change where. Change this in file snmpd.conf?

# Views
#   arguments viewname included eoid]

#  system + hrSystem groups only
view centreon included .1.3.6.1
view   systemonly  included   .1.3.6.1.2.1.1
view   systemonly  included   .1.3.6.1.2.1.25.1
view   all  included   .1
view   mib  included   .1.3.6.1.2.1