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Add missing documentation for NGINX_ENVSUBST_FILTER environment variable #2676

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tianon merged 1 commit into from
Jun 9, 2026
Merged

Add missing documentation for NGINX_ENVSUBST_FILTER environment variable #2676

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3 changes: 3 additions & 0 deletions nginx/content.md
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Expand Up @@ -112,6 +112,9 @@ This behavior can be changed via the following environment variables:
- 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.
- `NGINX_ENVSUBST_FILTER`
- A regular expression to filter environment variable names passed to `envsubst` (default: empty string)
- When set, only variables whose names match this pattern are available for substitution.

## Running %%IMAGE%% in read-only mode

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