mirror of
https://github.com/librenms/librenms.git
synced 2024-10-07 16:52:45 +00:00
51 lines
1.8 KiB
Markdown
51 lines
1.8 KiB
Markdown
|
# Performance optimisations
|
||
|
|
|
||
|
|
This document will give you some guidance on optimising your setup.
|
||
|
|
|
||
|
|
The suggestions are in a rough order of how much impact they will have.
|
||
|
|
|
||
|
|
#### RRDCached
|
||
|
|
|
||
|
|
We absolutely recommend running this, it will save on IO load. [RRDCached](http://docs.librenms.org/Extensions/RRDCached/)
|
||
|
|
|
||
|
|
|
||
|
|
#### MySQL Optimisation
|
||
|
|
|
||
|
|
It's advisable after 24 hours of running MySQL that you run (MySQL Tuner)[https://raw.githubusercontent.com/major/MySQLTuner-perl/master/mysqltuner.pl]
|
||
|
|
which will make suggestions on things you can change specific to your setup.
|
||
|
|
|
||
|
|
One recommendation we can make is that you set the following in my.cnf:
|
||
|
|
|
||
|
|
```bash
|
||
|
|
innodb_flush_log_at_trx_commit = 0
|
||
|
|
```
|
||
|
|
|
||
|
|
You can also set this to 2. This will have the possibility that you could lose upto 1 second on mysql data in the event
|
||
|
|
MySQL crashes or your server does but it provides an amazing difference in IO use.
|
||
|
|
|
||
|
|
|
||
|
|
#### Polling modules
|
||
|
|
|
||
|
|
Disable polling (and discovery) modules that you do not need. You can do this globally in `config.php` like:
|
||
|
|
|
||
|
|
Disable OSPF polling
|
||
|
|
```php
|
||
|
|
$config['poller_modules']['ospf'] = 0;
|
||
|
|
```
|
||
|
|
|
||
|
|
You can disable modules globally then re-enable the module per device or the opposite way. For a list of modules please see
|
||
|
|
[Poller modules](http://docs.librenms.org/Support/Poller%20Support/)
|
||
|
|
|
||
|
|
|
||
|
|
#### Optimise poller-wrapper
|
||
|
|
|
||
|
|
The default 16 threads that `poller-wrapper.py` runs as isn't necessarily the optimal number. A general rule of thumb is
|
||
|
|
2 threads per core but we suggest that you play around with lowering / increasing the number until you get the optimal value.
|
||
|
|
|
||
|
|
#### Recursive DNS
|
||
|
|
|
||
|
|
If your install uses hostnames for devices and you have quite a lot then it's advisable to setup a local recursive dns instance on the
|
||
|
|
LibreNMS server. Something like pdns-recursor can be used and then configure `/etc/resolv.conf` to use 127.0.0.1 for queries.
|
||
|
|
|
||
|
|
|