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Add php-opcache settings to Performance Tuning (#11452)

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* Add php-opcache settings to Performance Tuning

* Updated according to comment made by @murrant

* Changed the content based on discussions in Discord.

* Fixed space.

* Incorporated all changes as per ongoing discussions

* My recommendations.

* My reply to recommendations.

Co-authored-by: Tony Murray <murraytony@gmail.com>
This commit is contained in:
Hans Erasmus
2020-04-24 05:42:57 +02:00
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parent daebf8c765
commit 91574c9899
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doc/Support/Performance.md
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@@ -174,3 +174,44 @@ For Nginx (1.9.5 and above) change `listen 443 ssl;` to `listen 443
ssl http2;` in the Virtualhost config.
For Apache (2.4.17 an above) set `Protocols h2 http/1.1` in the Virtualhost config.
## PHP-opcache
A lot of performance can be gained from setting up `php-opcache` correctly.
**Note: Memory based caching with PHP cli will increase memory usage and slow things down. File based caching is not as fast as memory based and is more likely to have stale cache issues.**
Some distributions allow seperate cli, mod_php and php-fpm configurations, we can use this to set the optimal config.
### For web servers using mod_php and php-fpm
Update your web PHP opcache.ini. Possible locations: `/etc/php/7.2/fpm/conf.d/opcache.ini`, `/etc/php.d/opcache.ini`, or `/etc/php/conf.d/opcache.ini`
```
zend_extension=opcache
opcache.enable=1
opcache.memory_consumption=256
```
If you are having caching issues, you can clear the opcache by simply restarting httpd or php-fpm.
### For pollers
Create a cache directory that is writable by the librenms user first:
`sudo mkdir -p /tmp/cache && sudo chmod 775 /tmp/cache && sudo chown -R librenms /tmp/cache`
Update your PHP opcache.ini. Possible locations: `/etc/php/7.2/cli/conf.d/opcache.ini`, `/etc/php.d/opcache.ini`, or `/etc/php/conf.d/opcache.ini`
```
zend_extension=opcache.so
opcache.enable=1
opcache.enable_cli=1
opcache.file_cache="/tmp/cache/"
opcache.file_cache_only=0
opcache.file_cache_consistency_checks=1
opcache.memory_consumption=256
```
If you are having caching issues, you can clear the file based opcache with `rm -rf /tmp/cache`.