Lua Module support

[omegion]

Hi,

I am trying to build a new image for the Nginx container to support the Lua Module. However, I could not make it.

What I have tried so far:

FROM ghcr.io/nginx/nginx-gateway-fabric/nginx:1.6.0

USER root

RUN set -eux \
    && apk update \
    && apk add --no-cache nginx-mod-http-lua

COPY nginx/nginx.conf /etc/nginx/nginx.conf

This fail with:

2025/02/03 18:27:06 [emerg] 48#48: module "/usr/lib/nginx/modules/ndk_http_module.so" version 1024000 instead of 1027000 in /etc/nginx/nginx.conf:1
nginx: [emerg] module "/usr/lib/nginx/modules/ndk_http_module.so" version 1024000 instead of 1027000 in /etc/nginx/nginx.conf:1

it seems Lua version of Alpine is different. When I fix the version issue, this time I see the not compatible error:

2025/02/03 18:24:16 [emerg] 43#43: module "/usr/lib/nginx/modules/ndk_http_module.so" is not binary compatible in /etc/nginx/nginx.conf:1
nginx: [emerg] module "/usr/lib/nginx/modules/ndk_http_module.so" is not binary compatible in /etc/nginx/nginx.conf:1

How can we install the Lua module on top of the Nginx image? I know that the image already has the NJS module. But for my use case, I need to use Lua Redis to fetch keys from a Redis server.

[sjberman]

Hi @omegion, I haven't tested this, but I believe you need to add something like the following to the docker file:

RUN ./configure --with-compat --add-dynamic-module=<your-module>

[omegion]

@sjberman Thanks for your response, not sure if this repo has this executable:

Dockerfile:11
--------------------
   9 |     COPY nginx/nginx.conf /etc/nginx/nginx.conf
  10 |     
  11 | >>> RUN ./configure --with-compat --add-dynamic-module=nginx-mod-http-lua
--------------------
ERROR: failed to solve: process "/bin/sh -c ./configure --with-compat --add-dynamic-module=nginx-mod-http-lua" did not complete successfully: exit code: 127

[sjberman]

Sorry @omegion, I was a bit off base with my response. Got some information from those who know this area a bit better.

Basically our nginx container uses nginx.org's nginx package, therefore the lua module used must be compiled against the nginx.org's exact build and version of nginx.

You're attempting to use alpine's distribution of the nginx lua module rather than a module from nginx.org (and we don't ship a prebuilt module for lua for nginx oss).

You'll need to build the lua module from source to use it with the nginx.org nginx package, or customize the NGF nginx image in such a way that it utilizes the alpine nginx package rather than nginx.org's.