Distributed Poller - 2 Cluster Master

Help
1

I have installed librenms with:

1 x Master server
1 x slave(poller)

When I check the poller status I see the master and slave.

When I check the cluster master column for master and slave servers it indicates that they are both masters

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So the question is, is the expected behavior?
Should the cluster master coloum for slave1 not be NO

How do I verify that the distributed poller setup is correct

Thanks

2

Here is the ./validate

Master

root@master:/opt/librenms# ./validate.php -g distributedpoller

Component Version
LibreNMS 1.56-44-ge40a33631
DB Schema 2019_10_03_211702_serialize_config (145)
PHP 7.2.19-0ubuntu0.18.04.2
MySQL 10.1.41-MariaDB-0ubuntu0.18.04.1
RRDTool 1.7.0
SNMP NET-SNMP 5.7.3

====================================

[OK] Composer Version: 1.9.0
[OK] Dependencies up-to-date.
Checking distributedpoller: OK
[OK] Connection to memcached is ok
root@master:/opt/librenms#

Slave

root@slave1:/opt/librenms# ./validate.php -g distributedpoller

Component Version
LibreNMS 1.56-46-ga782efe7f
DB Schema 2019_10_03_211702_serialize_config (145)
PHP 7.2.19-0ubuntu0.18.04.2
MySQL 10.1.41-MariaDB-0ubuntu0.18.04.1
RRDTool 1.7.0
SNMP NET-SNMP 5.7.3

====================================

[OK] Composer Version: 1.9.0
[OK] Dependencies up-to-date.
Checking distributedpoller: OK
[OK] Connection to memcached is ok
root@slave1:/opt/librenms#

from the slave i can redis-cli

root@slave1:/opt/librenms# redis-cli -h 192.168.156.245
192.168.156.245:6379> AUTH password
OK
192.168.156.245:6379> ping
PONG
192.168.156.245:6379>

3

Try running the librenms-service.py from the cli and check the output. If it doesn’t say using redis for queues and locking, you have a misconfiguration.

Also make sure they are both pointing to the SAME redis and memcached servers.

4

Thanks That helped.

The last remaining issue I have is gaps in the graphs. I think that is related to my rrdcached configuration.

Is there a command I can run to test if the slave can reach the master with rrdcacehd?

Below is the configuration rrdcached.

SLAVE /etc/default/rrdcached

DAEMON=/usr/bin/rrdcached
DAEMON_USER=librenms
DAEMON_GROUP=librenms
WRITE_THREADS=4
WRITE_TIMEOUT=1800
WRITE_JITTER=1800
BASE_PATH=/opt/librenms/rrd/
JOURNAL_PATH=/var/lib/rrdcached/journal/
PIDFILE=/run/rrdcached.pid
SOCKFILE=/run/rrdcached.sock
SOCKGROUP=librenms
BASE_OPTIONS="-B -F -R"
NETWORK_OPTIONS="-L"

Slave config.php

$config[‘rrdcached’] = “unix:/var/run/rrdcached.sock”;
$config[‘rrdcached’] = “192.168.156.245:42217”;
$config[‘rrdtool_version’] = ‘1.5.5’;

Master server /etc/default/rrdcached

DAEMON=/usr/bin/rrdcached
DAEMON_USER=librenms
DAEMON_GROUP=librenms
WRITE_THREADS=4
WRITE_TIMEOUT=1800
WRITE_JITTER=1800
BASE_PATH=/opt/librenms/rrd/
JOURNAL_PATH=/var/lib/rrdcached/journal/
PIDFILE=/run/rrdcached.pid
SOCKFILE=/run/rrdcached.sock
SOCKGROUP=librenms
BASE_OPTIONS="-B -F -R"
NETWORk_OPTIONS="-l 0:42217"

Master config.php
$config[‘rrdcached’] = “unix:/var/run/rrdcached.sock”;
$config[‘rrdtool_version’] = ‘1.5.5’;

Thanks

5

I think I got it working.

6

Uh, again, you should have only ONE rrdcached server…