Implemented Bionic/libc compatibility.

dockerized/Dockerfile

@@ -1,7 +1,7 @@
-ARG DEBIAN_VERSION=bookworm
+ARG BASE_IMAGE=debian:bookworm-slim
 ARG NGINX_VERSION=1.28.0
 
-FROM debian:${DEBIAN_VERSION}-slim AS builder
+FROM ${BASE_IMAGE} AS builder
 
 ARG NGINX_VERSION
 ARG NGINX_CONFIGURE_ARGS="--with-compat --with-http_ssl_module --with-http_stub_status_module --with-http_realip_module --with-http_v2_module --with-http_gzip_static_module"
@@ -48,9 +48,10 @@ RUN ./configure \
     && cp objs/ngx_http_monitoring_module.so /usr/local/nginx/modules/
 
 
-FROM debian:${DEBIAN_VERSION}-slim AS runtime
+FROM ${BASE_IMAGE} AS runtime
 
 ARG NGINX_VERSION
+ARG OPENSSL_RUNTIME_PACKAGE=libssl3
 
 LABEL org.opencontainers.image.title="ngx_http_monitoring_module nginx image" \
       org.opencontainers.image.description="Nginx built with ngx_http_monitoring_module and embedded monitoring dashboard" \
@@ -60,7 +61,7 @@ RUN apt-get update \
     && apt-get install -y --no-install-recommends \
         ca-certificates \
         libpcre2-8-0 \
-        libssl3 \
+        ${OPENSSL_RUNTIME_PACKAGE} \
         zlib1g \
     && rm -rf /var/lib/apt/lists/* \
     && groupadd --system --gid 101 nginx \

dockerized/README.md

@@ -22,6 +22,12 @@ To choose a different Nginx version:
 NGINX_VERSION=1.28.0 sh dockerized/build.sh
 ```
 
+To build the image on an Ubuntu Bionic 18.04 libc baseline:
+
+```sh
+BASE_IMAGE=ubuntu:18.04 OPENSSL_RUNTIME_PACKAGE=libssl1.1 sh dockerized/build.sh
+```
+
 ## Run
 
 ```sh

dockerized/build.sh

@@ -3,11 +3,15 @@ set -eu
 
 IMAGE="${IMAGE:-ngx-http-monitoring-module:local}"
 NGINX_VERSION="${NGINX_VERSION:-1.28.0}"
+BASE_IMAGE="${BASE_IMAGE:-debian:bookworm-slim}"
+OPENSSL_RUNTIME_PACKAGE="${OPENSSL_RUNTIME_PACKAGE:-libssl3}"
 
 cd "$(dirname "$0")/.."
 
 docker build \
     --build-arg "NGINX_VERSION=$NGINX_VERSION" \
+    --build-arg "BASE_IMAGE=$BASE_IMAGE" \
+    --build-arg "OPENSSL_RUNTIME_PACKAGE=$OPENSSL_RUNTIME_PACKAGE" \
     -f dockerized/Dockerfile \
     -t "$IMAGE" \
     .

dockerized/docker-compose.yml

@@ -4,7 +4,9 @@ services:
       context: ..
       dockerfile: dockerized/Dockerfile
       args:
+        BASE_IMAGE: "debian:bookworm-slim"
         NGINX_VERSION: "1.28.0"
+        OPENSSL_RUNTIME_PACKAGE: "libssl3"
     image: ngx-http-monitoring-module:local
     container_name: ngx-http-monitoring-module
     ports: