Generate nginx config based on env vars

Utility to map env vars by convention to proxy settings.

Requirements

• gettext/envsubst which is included in alpine linux attow.

Usage

Assuming your environment variables define zero or more of

export <CUSTOM_PREFIX:API>_PROXY_ENDPOINT_<PROXY_NAME>=https://example.com
export <CUSTOM_PREFIX:API>_PROXY_PATH_<PROXY_NAME>=/example/

Executing ./generate-proxy-config.sh creates a proxy setting for you to be used with nginx.

As an example:

export API_PROXY_ENDPOINT_FOO_BAR=https://blah.example.com/foobar
export API_PROXY_PATH_FOO_BAR=/foo/bar/
export API_PROXY_ENDPOINT_FOO_BAZ=https://blah.example.com/foobaz
export API_PROXY_PATH_FOO_BAZ=/foo/baz/

./generate-proxy-config.sh

writes to ./proxy.conf:

location /foo/bar/ {
    proxy_pass https://blah.example.com/foobar;
}

location /foo/baz/ {
    proxy_pass https://blah.example.com/foobaz;
}

Or, equivalent to the above with custom namespace and custom output path:

export MY_SERVICE_API_PROXY_ENDPOINT_FOO_BAR=https://my-service.example.com/foobar
export MY_SERVICE_API_PROXY_PATH_FOO_BAR=/my-service/foobar/

./generate-proxy-config.sh MY_SERVICE_API  /etc/nginx/proxy.conf

writes to /etc/nginx/proxy.conf:

location /my-service/foobar/ {
    proxy_pass https://my-service.example.com/foobar;
}

You can now either reference it or directly embed it in your default.conf:

# Your default.conf.tpl
server {
    # basic config

    # **********************************************************
    # start env-based proxy config
    # end env-based proxy config
    # **********************************************************
}

Replace the # start env-based proxy config-Line:

sed "/# start env-based proxy config/r proxy.conf" default.conf.tpl >| default.conf

Test framework

See rylnd/shpec

Contribute

Bug Reports and Pull Requests welcome at github.com/iilei/nginx-dynamic-proxies