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389 Directory Server Wiki

Getting Started

Container Development (Easy Mode)

  1. Build the Dockerfile.openshift and Dockerfile images in that order. You can also pull the 389ds/389ds-website-ruby-27 from Quay.io. 
    $ podman build -t 389ds/389ds-website-ruby-27 -f Dockerfile.openshift
$ podman build -t site-test -f Dockerfile
  2. Run the site-test image with the site source mounted into it. The :z tells Podman to set the SELinux context on the volume. 
    $ podman run -v .:/site:z -p 4000:4000 --rm site-test
  3. You should only need to rebuild the underlying images if something in the site software stack changes: e.g. new dependencies, library updates, etc.

Local Development (Hard Mode)

You can test our your changes locally with:

docker build -t 389wiki:latest . docker run -p 4000:4000 389wiki:latest

This will then listen and server http://localhost:4000

If you want to setup a more permanent editing environment:

  1. yum install python3-pygments

  2. Install RVM. I know RVM can be a pain when you first start using it, but you will enjoy life more if you aren't dealing with conflicting gems all the time. Note: do NOT install RVM as root.

    First you must configure your terminal emulator to act as a login shell. In gnome-terminal, go to "Edit -> Profile Preferences -> Title and Command". Check the box reading "Run command as login shell." In xfce4-terminal, go to "Edit -> Preferences" and check the "Run command as login shell" box. See https://rvm.io/integration/gnome-terminal

    Start a new terminal and follow the instructions and then run

    $ rvm install ruby-2.7.1

    The documentation for RVM is extensive so don't be afraid to read it.

  3. Go into your checkout directory and run gem install bundler && bundle install

  4. Render the site with jekyll serve --watch. (See Advanced Workflow section for tips on getting real time previews of your updates).

  5. Make changes and save. If you wish to create a news item, run jekyll post "My Title". That command calls out to a plugin that will create a file with the correct name and format and open your editor as defined by VISUAL or EDITOR. You can use a different editor with the --editor option.

  6. Jekyll will automatically render your changes.

Advanced Workflow

  1. Optional: Open port 4000 in your firewall so others can see your local site

    $ firewall-cmd --add-port=4000/tcp --permanent

  2. If you wish to see real time previews of your updates (i.e. if you don't want to hit the refresh button all the time), then you can use jekyll serve --livereload.

  3. Extreme ProTip: Unfortunately, Jekyll is a bit simplistic in how it regenerates sites. It regenerates everything instead of just what it needs to. The Jekyll team has recognized this deficiency and has added an experimental option --incremental/-I that attempts to only regenerate the pages that actually changed. In my experience, it works well, so use it!

Syntax Highlighting

Syntax highlighting is provided by Pygments (more specifically by Pygments.rb -- a Ruby binding to Pygments). Set the highlighting on a code block by providing a lexer name after the three backticks that indicate the beginning of a code block.

The list of lexers is available at http://pygments.org/docs/lexers/, but in general they are named like you would expect. The most common ones we use are

  • java
  • ruby
  • python
  • console (a Bash console session)
  • json
  • properties (Java Properties format)
  • bash (a Bash script)
  • sql
  • ini (for Python conf files)
  • yaml

A special note about the console lexer: if the line is a command, you must begin with a "$", "#", or "%" otherwise the text will be treated as output. E.g.

Correct

$ ./subscription-manager

INCORRECT

./subscription-manager

Gotchas

  • In Markdown, whitespace matters! Specifically, when you're in a block (like a list element in a bulleted list) you need to make sure all sub-blocks have the same initial indentation.

Correct

* Hello World looks like
  ```
  print "Hello World"
  ```

INCORRECT

* Hello World looks like
```
print "Hello World"
```
  • Be careful with internal links. Preface them with {{ site.baseurl }} if they are in another directory. See http://jekyllrb.com/docs/github-pages/#project_page_url_structure
  • The URLs for all posts and pages contain a leading slash so there is no need to provide one. E.g. Linking to a post would use {{ site.baseurl }}{{ post.url }}

Tips

  • If you want to see an overview of an object in Liquid, filter it through the debug filter from _plugins. E.g. {{ page | debug }}

  • To find code blocks missing a lexer, install pcre-tools and use the following pcregrep -r -M -n '^$\n^```$' *

  • Vim associates '.md' files with Modula-2. Add the following to your .vimrc to change the association:

    autocmd BufNewFile,BufReadPost *.md set filetype=markdown

Openshift Setup

To interact with Openshift, you will need to install the command line client oc. It is available in DNF as a package named origin-clients but as a fairly old version. Instead I grabed it from the documenation which has a download link that will require you to log in to the Red Hat portal. Once you have the file, unzip it and place the oc file in a directory on your path. I have a directory ~/bin that is on my path, so that was the most convenient place for me.

Next you will need to authenticate. Run oc login and follow the prompts.

Due to our use of PlantUML (which requires Java), we cannot use one of the stock build images provided by Openshift since the stock containers just provide one language stack each. We have to build our own image which is defined in Dockerfile and references other files under .s2i. If you find yourself needing to modify the build image, you will need to install both Docker and the s2i tool. Like oc, s2i is a statically linked binary, so you'll need to download the appropriate tarball for your architecture and then place s2i in a directory on your path.

If you make changes to the Dockerfile, you should test them first.

  • Build the image with podman build -t 389ds/389ds-website-ruby-27 -f Dockerfile.openshift
  • Run s2i build --exclude="" . 389ds/389ds-website-ruby-27 --as-dockerfile websiteDockerfile. That will generate a Dockerfile using custom scripts inserted into 389ds-website-ruby-27 from the .s2i/bin directory.
  • Rebuild using the generated Dockerfile: podman build -t website -f websiteDockerfile. This will run the .s2i/bin/assemble script and build a container with the site processed through Jekyll.
  • Note that if you make changes to the assemble or run scripts, you need to commit those to git before running s2i. Otherwise, the changes will not be picked up!
  • rm websiteDockerfile && rm -rf upload/
  • Test everything by starting a container using podman run -p 8088:8080 --rm -ti website and browsing the site at http://localhost:8088. (Note, I surfaced the container's port 8080 as 8088 since Tomcat normally uses 8080 but you can use whatever port you like).
  • Hit CTRL-C to stop the container (and the --rm argument will remove the container immediately).

If your changes work, you'll need to propagate them to the Openshift Dedicated internal container registry. Go to the About page for Openshift Dedicated and it has the details on the internal registry but I will reproduce them here.

  • podman login registry.rh-us-east-1.openshift.com -u $(oc whoami) -p $(oc whoami -t)
  • podman tag 389ds/389ds-website-ruby-27:latest registry.rh-us-east-1.openshift.com/389ds/389ds-website-ruby-27:latest
  • podman push registry.rh-us-east-1.openshift.com/389ds/389ds-website-ruby-27:latest

We also push the image to Quay.io so that GitHub Actions can use the image for continuous integration builds.

  • podman login quay.io
  • podman tag 389ds/389ds-website-ruby-27:latest quay.io/389ds/389ds-website-ruby-27:latest
  • podman push quay.io/389ds/389ds-website-ruby-27:latest

Openshift should be configured to watch that image repository and rebuild everything when it detects a change to the image.

Environment Variables and Build and Run Processes

Any environment variables that we need to define (such as the BUNDLE_WITHOUT variable to exclude gems from a group in the Gemfile) are defined in .s2i/environment. If you ever need to change that then you will need to rebuild the build image as described above.

Any changes to the site building process (e.g. some pre-processing step needs to be run before jekyll build) or run process (e.g. additional arguments given to Puma) would be made in .s2i/bin/assemble and .s2i/bin/run respectively. Again, you would need to rebuild the build image and push it to Docker Hub.

Continuous Integration

The GitHub Actions CI workflow we use is based on a default Jekyll building workflow defined here. Ours is slightly different due to our use of s2i. Our s2i's assemble script expects the site source to be in /tmp/src so we bind mount the git checkout into that directory. The build is performed with the 389ds/website-ruby-27 container that we maintain and we do a shell trick with chmod to get the permissions on the bind mount correct. After that, we just invoke the assemble script ourselves.

References