Poller is not running - about to drive me nuts

Help
1

So for the last week my poller has not been running and I don’t know what made it stop.

Librenms is running on latest Debian 12 packages and I have tried to re-install Librenms without any luck as well. (3 times! - while saving the db, .env and rrd/)

Bu still doing ./validate.php gives me this:

===========================================
Component | Version
--------- | -------
LibreNMS  | 25.8.0-dev.18+0b0a7e7b4 (2025-07-30T00:05:52+02:00)
DB Schema | 2025_07_29_025425_hr_device_table_add_type_default (353)
PHP       | 8.2.29
Python    | 3.11.2
Database  | MariaDB 10.11.11-MariaDB-0+deb12u1
RRDTool   | 1.7.2
SNMP      | 5.9.3
===========================================

[OK]    Composer Version: 2.8.10
[OK]    Dependencies up-to-date.
[OK]    Database Connected
[OK]    Database Schema is current
[OK]    SQL Server meets minimum requirements
[OK]    lower_case_table_names is enabled
[OK]    MySQL engine is optimal
[OK]    Database and column collations are correct
[OK]    Database schema correct
[OK]    MySQL and PHP time match
[FAIL]  Poller is not running.  No poller has run within the last 300 seconds.
[OK]    Dispatcher Service not detected
[OK]    Locks are functional
[FAIL]  No active python wrapper pollers found
[OK]    Redis is unavailable
[OK]    rrdtool version ok
[OK]    Connected to rrdcached

And yeah, my ./daily.sh still does not work - Link here even with the re-installs!

I have googled this issues several times now without any resolution. Can someone help me out?

● cron.service - Regular background program processing daemon
     Loaded: loaded (/lib/systemd/system/cron.service; enabled; preset: enabled)
     Active: active (running) since Thu 2025-07-31 04:20:20 CEST; 48min ago
       Docs: man:cron(8)
   Main PID: 727 (cron)
      Tasks: 1 (limit: 76762)
     Memory: 25.6M
        CPU: 11.919s
     CGroup: /system.slice/cron.service
             └─727 /usr/sbin/cron -f

Jul 31 05:05:02 domain.tldCRON[4588]: pam_unix(cron:session): session closed for user librenms
Jul 31 05:06:01 domain.tld CRON[4646]: pam_unix(cron:session): session opened for user librenms(uid=999) by (uid=0)
Jul 31 05:06:01 domain.tld CRON[4647]: (librenms) CMD (   /opt/librenms/alerts.php >> /dev/null 2>&1)
Jul 31 05:06:01 domain.tld CRON[4646]: pam_unix(cron:session): session closed for user librenms
Jul 31 05:07:01 domain.tld CRON[4655]: pam_unix(cron:session): session opened for user librenms(uid=999) by (uid=0)
Jul 31 05:07:01 domain.tld CRON[4656]: (librenms) CMD (   /opt/librenms/alerts.php >> /dev/null 2>&1)
Jul 31 05:07:01 domain.tld CRON[4655]: pam_unix(cron:session): session closed for user librenms
Jul 31 05:08:01 nms.trdf.kriminalomsorg.no CRON[4665]: pam_unix(cron:session): session opened for user librenms(uid=999) by (uid=0)
Jul 31 05:08:01 domain.tld CRON[4666]: (librenms) CMD (   /opt/librenms/alerts.php >> /dev/null 2>&1)
Jul 31 05:08:02 domain.tld
 CRON[4665]: pam_unix(cron:session): session closed for user librenms


root@nms:~# cat /etc/cron.d/librenms
33   */6  * * *   librenms    /opt/librenms/cronic /opt/librenms/discovery-wrapper.py 1
*/5  *    * * *   librenms    /opt/librenms/discovery.php -h new >> /dev/null 2>&1

*/5  *    * * *   librenms    /opt/librenms/cronic /opt/librenms/poller-wrapper.py 16
*    *    * * *   librenms    /opt/librenms/alerts.php >> /dev/null 2>&1

*/5  *    * * *   librenms    /opt/librenms/poll-billing.php >> /dev/null 2>&1
01   *    * * *   librenms    /opt/librenms/billing-calculate.php >> /dev/null 2>&1
*/5  *    * * *   librenms    /opt/librenms/check-services.php >> /dev/null 2>&1
2

Update:

Exported the librenms db file to another location, same with rrd/, config.php and the .env file.
Did a rm -rf /opt/librenms
Then followed the install docs and installed librenms, added one random host to poll, and everything worked, even the ./daily.sh
So after one poll and re-added the old db with ca 650 hosts, and copied back the rrd-folder fixed the .evn with new APP_KEY and made that work and now the poller is not running again. So is there something in the sql file that librenms is not liking?

1 Like
3

Update 2:
So the poller stopped working around 25.07.25 - and I do daily mysql backups, I rolled back to the mysql db form 24.07.25 and now everything works!

4

One thing you should have done is looked in the librenms.log file for errors.

5

Yeah I did at the time, but there was whole lot of nothing! Just “ERROR” or something like that nothing informative

6

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