nginx (pronounced "engine-x") is an open-source reverse proxy server for the HTTP, HTTPS, SMTP, POP3, and IMAP protocols. nginx can also act as a load balancer, HTTP cache, and a web server (origin server).
## Usage
By default, the image launches nginx with the same configuration that comes with the SUSE Linux Enterprise Server.
```ShellSession
$ podman run -it --rm -p 8080:80 registry.opensuse.org/opensuse/nginx:1.27
```
Or:
```ShellSession
$ podman run -it --rm -p 8080:80 -v /path/to/html/:/srv/www/htdocs/:Z registry.opensuse.org/opensuse/nginx:1.27
```
**Note:** The directory `/srv/www/htdocs/` is the root directory used by the default server. Additional servers can use any other path.
You can access the served content on http://localhost:8080 or http://host-ip:8080.
## Using templates
By default, nginx doesn't support environment variables inside configuration blocks. This image includes a script that can extract environment variables before nginx creates configuration files.
The script reads `.template` files stored in `/etc/nginx/templates/` and saves the result of the [`envsubst`](https://www.gnu.org/software/gettext/manual/html_node/envsubst-Invocation.html) command to the directory `/etc/nginx/conf.d/`.
For example, if you want nginx to use port 80, create a file named `/etc/nginx/templates/default.conf.template` containing the following variable definition:
```nginx
listen ${NGINX_PORT};
```
The template above is then rendered to `/etc/nginx/conf.d/default.conf` as follows:
```nginx
listen 80;
```
## Environment variables
### NGINX_ENTRYPOINT_QUIET_LOGS
This optional environment variable controls the logging during container startup. Set the value to `1` to silence logs.
### NGINX_ENTRYPOINT_WORKER_PROCESSES_AUTOTUNE
This optional environment variable enables a script to autotune the number of worker processes. Set the value to `1` to enable autotune of the worker process parameter (default is disabled).
### NGINX_ENVSUBST_TEMPLATE_DIR
This optional environment variable specifies a directory containing template files (default is `/etc/nginx/templates`).
**Note:** The script ignores template processing if this directory doesn't exist
### NGINX_ENVSUBST_OUTPUT_DIR
This optional environment variable specifies a directory for storing results of running [`envsubst`](https://www.gnu.org/software/gettext/manual/html_node/envsubst-Invocation.html) on templates (default is `/etc/nginx/conf.d`).
The output filename is the template filename with the suffix `.template` removed.
**Note:** Modifying this variable also requires changing the `nginx.conf`, so it recognizes the new directory location.
### NGINX_ENVSUBST_TEMPLATE_SUFFIX
This optional environment variable changes the suffix of template files (default is `.template`).
**Note:** The script only processes files that have the specified suffix in their names.
### NGINX_ENVSUBST_FILTER
This optional environment variable enables filtering out variables in the template processing. Environment variables that do not match the regular expression defined by `NGINX_ENVSUBST_FILTER` are not replaced.
## Configuration scripts
To use scripts to perform configuration actions, add one or more `*.envsh` or `*.sh` scripts under `/docker-entrypoint.d/`. Any executable `*.envsh` or `*.sh` script found in the directory is executed before starting the service, which can be used to perform further configuration steps.
Currently, the container image ships with the following helper scripts:
-`20-envsubst-on-templates.sh` - Enables the use of environment variables in templates.
-`30-tune-worker-processes.sh` - Enables autotuning the number of worker processes.
**Warning:** The container startup is aborted if any of the scripts exits with an error.
