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OpenResty Docker image

Paths & config

NginX is configured with /opt/openresty/nginx prefix path, which means that, by default, it loads configuration from /opt/openresty/nginx/conf/nginx.conf file. The default HTML root path is /opt/openresty/nginx/html/.

OpenResty bundle includes several useful Lua modules located in /opt/openresty/lualib/ directory. This directory is already present in Lua package path, so you don't need to specify it in NginX lua_package_path directive.

The Lua NginX module is built with LuaJIT 2.1, which is also available as stand-alone lua binary.

NginX stores various temporary files in /var/nginx/ directory. If you wish to launch the container in read-only mode, you need to convert that directory into volume to make it writable:

# To launch container
docker run --name nginx --read-only -v /var/nginx ... reuters-media/openresty-luarocks

# To remove container and its volume
docker rm -v nginx

Installing LuaRocks packages

To install a package via LuaRocks:

/opt/openresty/luajit/bin/luarocks install lua-zlib

Note that you may also need to install dependencies. For example for lua-zlib, you will need gcc, g++, make, and zlib-dev.

Command-line parameters

NginX is launched with the nginx -g 'daemon off; error_log /dev/stderr info;' command. This means that you should not specify the daemon directive in your nginx.conf file, because it will lead to NginX config check error (duplicate directive).

No-daemon mode is needed to allow host OS' service manager, like systemd, or Docker itself to detect that NginX has exited and restart the container. Otherwise in-container service manager would be required.

Error log is redirected to stderr to simplify debugging and log collection with Docker logging drivers or tools like logspout.

Usage during development

To avoid rebuilding your Docker image after each modification of Lua code or NginX config, you can add a simple script that mounts config/content directories to appropriate locations and starts NginX:

#!/usr/bin/env bash

exec docker run --rm -it \
  --name my-app-dev \
  -v "$(pwd)/nginx/conf":/opt/openresty/nginx/conf \
  -v "$(pwd)/nginx/lualib":/opt/openresty/nginx/lualib \
  -p 8080:8080 \
  reuters-media/openresty-luarocks:latest "$@"

# you may add more -v options to mount another directories, e.g. nginx/html/

# do not do -v "$(pwd)/nginx":/opt/openresty/nginx because it will hide
# the NginX binary located at /opt/openresty/nginx/sbin/nginx

Place it next to your Dockerfile, make executable and use during development. You may also want to temporarily disable Lua code cache to allow testing code modifications without re-starting NginX.