J1 Docker

J1 Docker is a Docker Image to manage all development and run-time processes for J1 Template. The image contains, beside of Jekyll and a full set of RubyGems, all development dependencies like the languages Ruby, Python and NodeJS ready to use.

Image Types

• jekyllone/j1dev: Development image
• jekyllone/j1app: Web Application image

Development

The development image jekyllone/j1dev can be used to run all development processes for:

• j1_template_mde_dev, the Developer package for J1 on Github
• j1_template_mde, a RubyGem to create run-time versions

export JEKYLL_VERSION=3.8
docker run --rm \
  --volume=$PWD:/srv/jekyll \
  -p 35729:35729 -p 40000:40000 \
  -it jekyllone/j1dev:latest \
  j1 serve --incremental

RubyGems

J1 Docker will attempt to install any dependencies that you list inside of your Gemfile, matching the versions you have in your Gemfile.lock, including Jekyll if you have a version that does not match the version of the image you are using (you should be doing gem "jekyll", "~> 3.8" so that minor versions are installed if you use say image tag "3.7.3").

Update from a Gemfile

If you provide a Gemfile and would like to update your Gemfile.lock you can run:

export JEKYLL_VERSION=3.8
docker run --rm \
  --volume="$PWD:/srv/jekyll" \
  -it jekyllone/j1dev:latest \
  bundle update

LiveReload

J1 images support jekyll-reload. All you need do is to configure it according to your needs.

export JEKYLL_VERSION=3.8
docker run --rm \
  --volume=$PWD:/srv/jekyll \
  -p 35729:35729 -p 40000:40000 \
  -it jekyllone/j1dev:latest \
  j1 serve --incremental --livereload

Build Images

You can build images or any specific tag of an image running

bundle exec docker-template build

or

bundle exec docker-template build repo:tag

It's simple like that to build images!

Example:

bundle exec docker-template build j1dev:latest --no-push

Reset a Build

bundle exec docker-template clean

Remove images after Build

This will print you all untagged images

docker images ls -a | grep "^<none>" | awk "{print $3}"

This filtering also works for dangling volumes. To remove all those images run:

docker rm $(docker images ls -a | grep "^<none>" | awk "{print $3}")

docker image ls -a | grep -v "^<none>"

Explore an Image

To have a look inside an image, run a container using a bash (shell):

docker run --rm \
  --name j1_develop \
  --hostname j1_develop \
  --volume=$PWD:/srv/jekyll \
  -it jekyllone/j1dev:3.8 bash

=======

This will print you all untagged images

docker image ls -a | grep "^<none>" | awk "{print $3}"
docker image ls -a | grep "^<none>" | sed 's/  */ /g' | cut -d" " -f 3

This filtering also works for dangling volumes. To remove all those images run:

docker image rm --force $(docker image ls -a | grep "^<none>" | awk "{print $3}") --force
docker image rm --force $(docker image ls -a | grep "^<none>" | sed 's/  */ /g' | cut -d" " -f 3)

Explore an Image

To have a look inside an image, run a container using a bash (shell):

docker run --rm \
  --name j1_develop \
  --hostname j1_develop \
  --volume=$PWD:/srv/jekyll \
  -it jekyllone/j1dev:latest bash

docker images --format '{{.Size}}\t{{.Repository}}:{{.Tag}}\t{{.ID}}' | sort -r | column -t

== What are docker none-none images?

See: https://www.projectatomic.io/blog/2015/07/what-are-docker-none-none-images/ See: https://github.com/justone/dockviz

docker image ls -f dangling=true -q