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modify the usage

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Syunsuke Komma 2019-05-02 08:21:05 +09:00
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nginx/content.md
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@ -68,7 +68,7 @@ $ docker run --name my-custom-nginx-container -d custom-nginx
### Using environment variables in %%IMAGE%% configuration ### Using environment variables in %%IMAGE%% configuration
Out-of-the-box, %%IMAGE%% doesn't support environment variables inside most configuration blocks. But this image contains a script to run `envsubst`, named `nginx-envsubst`. The script will be invoked automatically and will extract environment variables before %%IMAGE%% starts. Out-of-the-box, %%IMAGE%% doesn't support environment variables inside most configuration blocks. But this image has a function, which will extract environment variables before %%IMAGE%% starts.
Here is an example using docker-compose.yml: Here is an example using docker-compose.yml:
@ -76,7 +76,7 @@ Here is an example using docker-compose.yml:
web: web:
image: %%IMAGE%% image: %%IMAGE%%
volumes: volumes:
- ./default.conf.template:/etc/nginx/templates/default.conf.template - ./templates:/etc/nginx/templates
ports: ports:
- "8080:80" - "8080:80"
environment: environment:
@ -84,25 +84,29 @@ web:
- NGINX_PORT=80 - NGINX_PORT=80
``` ```
The `default.conf.template` file may then contain variable references like this: By default, this function reads template files in `/etc/nginx/templates/*.template` and outputs the result of executing `envsubst` to `/etc/nginx/conf.d`.
``` So if you place `templates/default.conf.template` file, which contains variable references like this:
listen ${NGINX_PORT};
```
By default, `nginx-envsubst` reads template files in `/etc/nginx/templates` and outputs the result of executing `envsubst` to `/etc/nginx/conf.d`. listen ${NGINX_PORT};
This behavior can be changed via the following environent variables: outputs to `/etc/nginx/conf.d/default.conf` like this:
- `NGINX_ENVSUBST_TEMPLATE_DIR` listen 80;
- A directory containing template files (default: `/etc/nginx/templates`)
- `NGINX_ENVSUBST_TEMPLATE_SUFFIX` This behavior can be changed via the following environment variables:
- A suffix of template files (default: `.template`)
- `nginx-envsubst` only processes the files whose name contains this suffix. - `NGINX_ENVSUBST_TEMPLATE_DIR`
- `NGINX_ENVSUBST_OUTPUT_DIR` - A directory which contains template files (default: `/etc/nginx/templates`)
- A directory where the result of executing envsubst is output (default: `/etc/nginx/conf.d`) - When this directory doesn't exist, this function will do nothing about template processing.
- The output filename is the template filename with the suffix removed. - `NGINX_ENVSUBST_TEMPLATE_SUFFIX`
- ex.) `/etc/nginx/templates/default.conf.template` will be output with the filename `/etc/nginx/conf.d/default.conf`. - A suffix of template files (default: `.template`)
- This function only processes the files whose name ends with this suffix.
- `NGINX_ENVSUBST_OUTPUT_DIR`
- A directory where the result of executing envsubst is output (default: `/etc/nginx/conf.d`)
- The output filename is the template filename with the suffix removed.
- ex.) `/etc/nginx/templates/default.conf.template` will be output with the filename `/etc/nginx/conf.d/default.conf`.
- This directory must be writable by the user running a container.
## Running %%IMAGE%% in read-only mode ## Running %%IMAGE%% in read-only mode