NGINX Host Hugo Unit

A Docker container that provides a Hugo unit for NGINX Host. This unit only supports Hugo sites that are available via a remote source control repository.

Features

• Hugo v0.30.2
• Can automatically regenerate your Hugo site upon a push to your GitHub or GitLab repository

Usage

Prerequisites

NGINX_UNIT_HOSTS Considerations

It is important that the value of your NGINX_UNIT_HOSTS environment variable doesn't include wildcards or regular expressions as this value will be used by Hugo to determine the base URL of your site. Also, if the variable contains multiple hosts (e.g., myhost.com,otherhost.com), only the first host (the one before the ,) will be used.

Configuration

It is highly recommended that you use container orchestration software such as Docker Compose when using this NGINX Host unit as several Docker containers are required for operation. This guide will assume that you are using Docker Compose.

To begin, start with a basic docker-compose.yml file as described in the NGINX Host configuration guide. Then, add a service for the NGINX Host Hugo unit (named hugo):

hugo:
  image: handcraftedbits/nginx-unit-hugo
  environment:
    - NGINX_UNIT_HOSTS=mysite.com
    - NGINX_URL_PREFIX=/blog
    - HUGO_REPO_URL=https://github.com/mysite/blog.git
    - HUGO_REPO_SECRET=password
    - HUGO_THEME=my_hugo_theme
  volumes:
    - data:/opt/container/shared

Observe the following:

• Several environment variables are used to configure Hugo. See the environment variable reference for additional information.
• As with any other NGINX Host unit, we mount our data volume, in this case named data, to /opt/container/shared.

Finally, we need to create a link in our NGINX Host container to the hugo container in order to host Hugo. Here is our final docker-compose.yml file:

version: "2.1"

volumes:
  data:

services:
  hugo:
    image: handcraftedbits/nginx-unit-hugo
    environment:
      - NGINX_UNIT_HOSTS=mysite.com
      - NGINX_URL_PREFIX=/blog
      - HUGO_REPO_URL=https://github.com/mysite/blog.git
      - HUGO_REPO_SECRET=password
      - HUGO_THEME=my_hugo_theme
    volumes:
      - data:/opt/container/shared

  proxy:
    image: handcraftedbits/nginx-host
    links:
      - hugo
    ports:
      - "443:443"
    volumes:
      - data:/opt/container/shared
      - /etc/letsencrypt:/etc/letsencrypt
      - /home/me/dhparam.pem:/etc/ssl/dhparam.pem

This will result in making Hugo available at https://mysite.com/blog.

Theme Considerations

The NGINX Host Hugo unit assumes that all themes are stored alongside your content in your repository. This means that the value of the HUGO_THEME environment variable should specify the name of a directory in your repository that contains the Hugo theme you wish to use.

The easiest way to store your themes alongside your content is to simply copy the theme into a directory. A better approach, if the theme is available in its own Git repository, is to use a Git submodule, for example:

git submodule add user@myrepo.com:my_theme themes/my_theme

Enabling Site Regeneration After Git Repository Push

If your content repository is stored in GitHub or GitLab, your Hugo site can be automatically regenerated after a push. Simply create a GitHub webhook or a GitLab webhook for your repository with the URL

https://<host>/<prefix>/rebuild

where <host> is your server's hostname and <prefix> is webhooks-hugo if the environment variable NGINX_URL_PREFIX is set to / or webhooks-<sitePrefix> if NGINX_URL_PREFIX is set to <sitePrefix>. For example, if the blog is hosted at https://mysite.com/, then the webhook URL will be https://mysite.com/webhooks-hugo/rebuild; if the blog is hosted at https://mysite.com/blog (i.e., NGINX_URL_PREFIX is set to /blog), the webhook URL will be https://mysite.com/webhooks-blog/rebuild.

You will also need to set the environment variable HUGO_REPO_SECRET to the secret value specified during configuration of the webhook in GitHub or GitLab.

Pre-build Script

You can run a pre-build script (for example, to copy resources before Hugo generates your site) by attaching a file to the /opt/container/script/pre-hugo-build.sh volume, for example:

hugo:
  image: handcraftedbits/nginx-unit-hugo
  environment:
    - NGINX_UNIT_HOSTS=mysite.com
    - NGINX_URL_PREFIX=/blog
    - HUGO_REPO_URL=https://github.com/mysite/blog.git
    - HUGO_REPO_SECRET=password
    - HUGO_THEME=my_hugo_theme
  volumes:
    - data:/opt/container/shared
    - /home/me/my-pre-build-script.sh:/opt/container/script/pre-hugo-build.sh

The directory where your Hugo repository has been cloned will be provided to this script as the first argument.

Post-build Script

You can run a post-build script (for example, to minimize HTML after Hugo generates your site) by attaching a file to the /opt/container/script/post-hugo-build.sh volume, for example:

hugo:
  image: handcraftedbits/nginx-unit-hugo
  environment:
    - NGINX_UNIT_HOSTS=mysite.com
    - NGINX_URL_PREFIX=/blog
    - HUGO_REPO_URL=https://github.com/mysite/blog.git
    - HUGO_REPO_SECRET=password
    - HUGO_THEME=my_hugo_theme
  volumes:
    - data:/opt/container/shared
    - /home/me/my-post-build-script.sh:/opt/container/script/post-hugo-build.sh

The directory where your Hugo repository has been cloned will be provided to this script as the first argument.

Running the NGINX Host Hugo Unit

Assuming you are using Docker Compose, simply run docker-compose up in the same directory as your docker-compose.yml file. Otherwise, you will need to start each container with docker run or a suitable alternative, making sure to add the appropriate environment variables and volume references.

Reference

Environment Variables

HUGO_IGNORE_CACHE

Used to ignore Hugo's cache directory (i.e., calls Hugo with the --ignoreCache parameter) if set to true.

Default value: false

HUGO_REPO_BRANCH

The branch of the Git repository hosting your Hugo site.

Default value: master

HUGO_REPO_SECRET

The secret value used when setting up the Hugo site rebuild webhook on GitHub or GitLab.

Required

HUGO_REPO_URL

The URL of the Git repository hosting your Hugo site.

Required if your Git repository is hosted on GitHub or GitLab.

HUGO_THEME

The name of the theme used to render your Hugo site.

Required

Others

Please see the NGINX Host documentation and docker-nginx-unit-webhook documentation for information on additional environment variables understood by this unit.