Nginx Docker and Environment Variables

Nginx Docker and Environment Variables

Use perl module to read environment variables. If you google for Nginx docker and environment variables you’ll end up with envsubst workaround to pass environment variables.

If you google for Nginx docker and environment variables you’ll end up with *envsubst *workaround to pass environment variables to the docker container. Although that workaround works, it’s not that flexible and easy to operate.


The docker image:

I like alpine-based images because they are light-weight and secure. You might wonder why I’m using Perl *enabled image, the answer is short: To be able to read environment variables in Nginx, the nginx-mod-http-perl module is needed and that runs on *Perl!

FROM nginx:1.18.0-alpine-perl

RUN apk add --no-cache nginx-mod-http-perl
COPY nginx.conf /etc/nginx/nginx.conf
COPY default.conf /etc/nginx/conf.d/default.conf
EXPOSE 80/tcp
EXPOSE 443/tcp
CMD ["/bin/sh", "-c", "exec nginx -g 'daemon off;';"]
WORKDIR /usr/share/nginx/html

Nginx Configurations

The Nginx main configuration file is nginx.conf and that is located in /etc/nginx/nginx.conf . We use this file to load Nginx modules and configure the enviroment variables.

To load the module, simply use following line of code:

load_module "modules/ngx_http_perl_module.so";

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