Updated Tuning EGroupware for higher number of users (markdown)

Tuning-EGroupware-for-higher-number-of-users.md

@@ -18,6 +18,37 @@ and rebuild the egroupware container with:
 docker-compose up -d
 ```
 
+## Number of processes PHP FPM starts/keeps to server incoming requests
+
+> If you regularly see the following message in the log of your egroupware container (```docker logs -f egroupware```):
+```
+WARNING: [pool www] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning N children, there are 0 idle, and M total children 
+```
+
+1. Copy the ```www.conf``` configuration file out of the container (replace 7.4 with the used PHP version!):
+```
+docker cp egroupware:/etc/php/7.4/fpm/pool.d/www.conf /etc/egroupware-docker/
+```
+2. Increase - eg. double - the values for ```pm.start_servers```, ```pm.min_spare_servers``` and ```pm.max_spare_servers```:
+```
+vi /etc/egroupware-docker/www.conf
+```
+3. Modify your /etc/egroupware-docker/docker-compose.override.yml to mount the file into your container (replacing the original file):
+```
+vi /etc/egroupware-docker/docker-compose.override.yml
+
+services:
+  egroupware:
+    volumes:
+      - /etc/egroupware-docker/www.conf:/etc/php/7.4/fpm/pool.d/www.conf:ro
+```
+> Indention in YAML files must be done with space (no tabs!) and the indention matters!
+4. Restart your egroupware container with the new config:
+```
+cd /etc/egroupware-docker
+docker-compose up -d
+```
+
 ## Number of connections in Nginx servers
 
 >  EGroupware Nginx and our Push server has a limit of 1024 concurrent connections (Nginx proxy on Host under Ubuntu 20.04 only 768!).