New page describing how to modify EGroupware environment for higher number of users

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

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+> The containerized EGroupware environment is configured for 100-200 users by default.
+
+## Size of shared memory used for the cache (APCu)
+
+> By default a size of 128 MB is used. Current usage can be checked under ```Administration > PHP Information > View APCu stats```
+
+To set a higher amount, you need to add / uncomment the following environment Variable in /etc/egroupware-docker/docker-compose.override.yml
+```
+service:
+  egroupware:
+
+    environment:
+    - EGW_APC_SHM_SIZE=256M
+```
+and rebuild the egroupware container with:
+```
+/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!).
+
+To allow a higher number eg. 4096 in our example you need to make the following changes:
+
+1. Modify /etc/nginx/nginx.conf and restart Nginx with: ```nginx -s reload```
+```
+events {
+    #worker_connections  768;
+    worker_connections  4096;
+    # multi_accept on;
+}
+# we proxy, so each client connection (worker_connections) need 2 file-handles (worker_rlimit_nofile)!
+worker_rlimit_nofile 8192;
+```
+2. Copy /etc/nginx/nginx.conf from the egroupware-nginx container to /etc/egroupware-docker/egroupware-etc-nginx.conf:
+```
+docker cp egroupware-nginx:/etc/nginx/nginx.conf /etc/egroupware-docker/egroupware-etc-nginx.conf
+```
+3. Modify /etc/egroupware-docker/egroupware-etc-nginx.conf
+```
+events {
+    #worker_connections  1024;
+    worker_connections  4096;
+    # multi_accept on;
+}
+# we proxy, so each client connection (worker_connections) need 2 file-handles (worker_rlimit_nofile)!
+worker_rlimit_nofile 8192;
+```
+4. Add the modified file as volume to the Nginx container by modifying /etc/egroupware-docker/docker-compose.override.yml
+```
+service:
+
+  nginx:
+    volumes:
+    - /etc/egroupware-docker/egroupware-etc-nginx.conf:/etc/nginx/nginx.conf
+```
+> Indention in YAML files must be done with space (no tabs!) and the indention matters!
+5. Add the following environment variable for our push-server to /etc/egroupware-docker/docker-compose.overreide.yml:
+```
+service:
+
+  push:
+    environment:
+    - EGW_MAX_PUSH_USERS=4096
+```
+5. Reload/rebuild the containers:
+```
+cd /etc/egroupware-docker
+docker-compose up -d
+```
+
+## Tuning of MariaDB container
+You can add your modifications to /etc/egroupware-docker/mariadb.cnf and restart the container.
+
+