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S2I: Node.js / NGINX

This is an updated fork of jshmrtn/s2i-nodejs-nginx, that builds on their incredible work - thank you jshmrtn! 🤘

Usage

# The repository containing the static application you'd like to build
export REPO_URL=https://github.com/evanshortiss/s2i-nodejs-nginx-example

# Name for the resulting image tag
export OUTPUT_IMAGE_NAME=nginx-webapp-runner

# Build the specified repo using the latest Node.js version,
# and serve it using the latest NGINX available in Alpine linux
s2i build $REPO_URL quay.io/evanshortiss/s2i-nodejs-nginx:latest $OUTPUT_IMAGE_NAME

Security Note

This image provides a convenient way to build web application containers. The tradeoff is that the resulting container is a little bloated with Python, g++, Node.js etc. If you want leaner production grade containers you should consider a Multi-Stage Build or OpenShift Chained Builds.

What Does it Do?

When used in conjunction with s2i (source-to-image), it bundles the source code for a webapp that is built using Node.js tools, and produces a runnable container image that serves the content using NGINX.

The process is illustrated in the diagram below:

How it Works

Supported Version Combinations

The text in the parentheses below are available image tag names.

  • Node.js 16 and NGINX 1.18 (16-nginx1.18 / latest)
  • Node.js 16 and NGINX 1.16 (16-nginx1.16)
  • Node.js 14 and NGINX 1.18 (14-nginx1.18)
  • Node.js 14 and NGINX 1.16 (14-nginx1.16)
  • Node.js 12 and NGINX 1.18 (12-nginx1.18)
  • Node.js 12 and NGINX 1.16 (12-nginx1.16)
  • Node.js 10 and NGINX 1.18 (10-nginx1.18)
  • Node.js 10 and NGINX 1.16 (10-nginx1.16)

Each of these is available at quay.io/evanshortiss/s2i-nodejs-nginx in the format quay.io/evanshortiss/s2i-nodejs-nginx:14-nginx1.18.

Minor Node.js versions cannot be specified. Each tag is built using the Node.js Alpine base images from Docker Hub, e.g 14-alpine.

Detailed Usage Instructions

Application Prerequisites

The web application being built using this builder must:

  1. Contain a build entry in the scripts section of the package.json
  2. The build script must produce a dist/ folder (alternative directory can be specified using a BUILD_OUTPUT_DIR environment variable) in the root of the repository (it can be added to .gitignore)
  3. An index.html must be at the root of the dist/ folder
  4. All other static assets must be included in the dist/ relative to index.html

A sample application that satisfies these requirements can be found here.

yarn/npm

If the builder detects a yarn.lock in your repository it will use yarn instead of npm to install dependencies and execute the build script in your package.json.

Source to Image (s2i) CLI

You need to install s2i and Docker before running the s2i build command below to generate a container image.

# Node.js version used for building the app, and NGINX the version for serving
export BUILDER_VERSION=14-nginx1.18

# The repository containing the application you'd like to build
export REPO_URL=https://github.com/evanshortiss/s2i-nodejs-nginx-example

# Name for the resulting image tag
export OUTPUT_IMAGE_NAME=nginx-webapp-runner

s2i build $REPO_URL quay.io/evanshortiss/s2i-nodejs-nginx:$BUILDER_VERSION $OUTPUT_IMAGE_NAME

This will produce a container named nginx-webapp-runner that can be started via docker run -p 8080:8080 nginx-webapp-runner.

OpenShift CLI

With the OpenShift CLI (oc) you can deploy the static site using the following command:

# Node.js version to use for building the application (does not support minor versions)
export BUILDER_VERSION=14-nginx1.16

# The repository containing the application you'd like to build
export REPO_URL=https://github.com/evanshortiss/s2i-nodejs-nginx-example

oc new-app quay.io/evanshortiss/s2i-nodejs-nginx:$BUILDER_VERSION~$REPO_URL

This will create a BuildConfig and the other necessary API Objects on your OpenShift instance to build the application via source-to-image and deploy it.

Configuration

Defaults

The out of the box configuration does the following:

  • Listens on port 8080
  • Serves dist/index.html for the / route
  • Applies GZIP compression to text-based assets larger than 1000 bytes
  • Logs at INFO level to stdout
  • Includes NGINX default mime type mappings

Environment Variables

Build-time

Set these during an s2i build using the --env flag, or on the BuildConfig in OpenShift:

  • BUILD_OUTPUT_DIR (default: dist):
    • Tells the build image where npm run build places assets.
    • For example, if using Create React App you need to set BUILD_OUTPUT_DIR=build.
    • With Webpack you might use a custom output directory, so you set BUILD_OUTPUT_DIR=my-custom-dir

Runtime

These can be set when running the built container. Currently none are supported.

Customising nginx.conf

You can add your custom nginx.conf to the container. While assembling, the builder looks for a nginx.conf file in your project .s2i/nginx directory. If there is a nginx.conf present at .s2i/nginx/nginx.conf, it will copy all contents of the .s2i/nginx/ directory and put it into the target images /opt/app-root/etc directory. There the custom nginx.conf file will be used.

nginx.conf includes

You can include files in your custom configuration. This is useful if you have many configuration files. If you provide the builder with a custom nginx.conf file in your projects .s2i/nginx/ directory, all other files inside .s2i/nginx/ will be copied along as well. So you could for example include a file with mime types in your custom nginx.conf. Add the file .s2i/nginx/mime.types to your project and include it like this:

include /opt/app-root/etc/mime.types;

Basic Auth

The builder can add basic auth to the container for you. All you need to do is to set some environment variables.

Note: These must be set on the OpenShift BuildConfig

  • BASICAUTH_USERNAME - the username used for basic auth.
  • BASICAUTH_PASSWORD - the password used for basic auth.
  • BASICAUTH_TITLE - the title used for basic auth.

Tips for Testing and Development

If you'd like to contribute, then being able to test locally is a must. Here are some helpful commands to get running locally:

Build a Builder Image

This will produce a builder image that uses Node.js 14 and NGINX 1.18:

export NODE_VERSION=14
export NGINX_VERSION=1.18

# Must set the APK_REPO to 3.12 find NGINX 1.18
export APK_REPO=http://dl-cdn.alpinelinux.org/alpine/v3.10/main

docker build . -f alpine.Dockerfile \
--build-arg NODE_VERSION=$NODE_VERSION \
--build-arg NGINX_VERSION=$NGINX_VERSION \
--build-arg APK_REPO=$APK_REPO \
-t s2i-webapp-builder

To use NGINX 1.16, change the NGINX_VERSION and APK_REPO variables:

export NODE_VERSION=14
export NGINX_VERSION=1.16

# Set the APK_REPO to 3.10 find NGINX 1.16, or 3.12 for NGINX 1.18
export APK_REPO=http://dl-cdn.alpinelinux.org/alpine/v3.12/main

docker build . -f alpine.Dockerfile \
--build-arg NODE_VERSION=$NODE_VERSION \
--build-arg NGINX_VERSION=$NGINX_VERSION \
--build-arg APK_REPO=$APK_REPO \
-t s2i-webapp-builder

Testing Builder Images

# The repository that s2i should clone and build
export REPO_URL="<the repo you want to build>"

# The BUILD_OUTPUT_DIR needs to be set to "build"  if the application in
# REPO_URL uses react-scripts build. Otherwise, change it according to your
# custom output directory, e.g dist
export BUILD_OUTPUT_DIR=build

# Perform an s2i build.

s2i build $REPO_URL --env BUILD_OUTPUT_DIR=$BUILD_OUTPUT_DIR s2i-webapp-builder s2i-webapp-runner


# Run the resulting image and expose it on port 8080
docker run -f --rm --name webapp -p 8080:8080 s2i-webapp-runner

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