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weba/03_nginx_intro.md
2026-04-10 13:19:27 +02:00

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# Nginx Intro
The main folder of nginx is found under:
```text
/etc/nginx
```
Check the complete folder structure (incl. subfolders):
```bash
sudo apt install tree
tree /etc/nginx/
```
## nginx.conf
* This is the main configuration file. It includes settings like logging, configuration of worker-processes and includes other configuration files.
* This is the first read configuration file (from top to bottom).
* Files included via `include`, are inserted at the location of the directive.
* The scope of settings can either be: `http`, `server`, `location` (wide to narrow). Some settings are allowed at multiple scope level. A similair pattern applies for sites that can be general (all domains), or more narrow (specific domain). Settings in a narrow scope overwrite settings in a wider scope.
* conflicting settings within the same scope are rejected, sometimes ignored (sanity check on startup). But anyhow those conflicts can be identified via `nginx -t`.
## conf.d
Folder for configuration files. All files ending with `.conf` are automatically loaded by nginx.
Allows better structure and delegations.
## sites-available
Used for site (domain) specific configuration files (virtual hosting). Configurations in `sites-available` are **ignored** by nginx.
## sites-enabled
Used to enable the sites defined in `sites-available`. It should contain only symlinks.
## modules-available and modules-enabled
Used for nginx modules (extensions).
## Configuration structure
Nginx uses following hierachical structure:
```nginx
# --- main context (global) ---
user nginx;
worker_processes auto;
events {
# --- event-context ---
worker_connections 1024;
}
http {
# --- HTTP-context (Webserver-Settings) ---
include /etc/nginx/mime.types;
server {
# --- server-context (Virtual Host / Website) ---
listen 80;
server_name example.com;
root /var/www/example.com;
location / {
# --- location-context (URL-Handling) ---
try_files $uri $uri/ =404;
}
}
}
```
# Document-Root
per default the document-root is defined (in nginx.conf) under:
```text
/var/www/html/
```
Best-practice to generate a custom-directory within `/var/www/` per domain. E.g. the website `example.com` would be:
`/var/www/example.com/`
# Logging
default folder for nginx log files is:
```text
/var/log/nginx/
```