hoyajigi / heroku-docker

Turn Heroku apps into Docker images

heroku-docker

Turn Heroku apps into Docker images

Installation

$ heroku plugins:install https://github.com/ddollar/heroku-docker

Prerequsites

You'll need a working docker CLI and a valid DOCKER_HOST. You should be able to docker ps successfully.

Usage

Build a Docker image from your Heroku app

$ heroku docker:build -a myapp
Sending build context to Docker daemon 3.584 kB
Sending build context to Docker daemon
Step 0 : FROM ddollar/heroku-bamboo
 ---> 66f87f3cd8fb
...
Step 32 : CMD thin -p 5000 -e ${RACK_ENV:-production} -R $HEROKU_RACK start
 ---> Running in 2ae2bfff2db2
 ---> e22b7e884e9a
Removing intermediate container 2ae2bfff2db2
Successfully built e22b7e884e9a
Built image myapp

Get an env-file suitable for docker run

$ heroku docker:env -a myapp
FOO=bar

Build a Docker image from a Heroku app and then run it using the app's config vars

$ heroku docker:run -a myapp
>> Thin web server (v1.2.7 codename No Hup)
>> Maximum connections set to 1024
>> Listening on 0.0.0.0:5000, CTRL+C to stop

Find your app's web port in Docker

$ docker ps
CONTAINER ID        IMAGE               COMMAND                CREATED             STATUS              PORTS                     NAMES
131c1ea36d2f        myapp:latest        /bin/sh -c 'thin -p    1 seconds ago       Up 2 seconds        0.0.0.0:49164->5000/tcp   suspicious_lovelace

Test your app

$ curl http://127.0.0.1:49164
ok

Copyright

David Dollar

License

MIT