在Heroku Rails Cedar 14上安装ImageMagick Buildpack

Question

I am trying to install this 3rd party Heroku buildpack for ImageMagick: https://github.com/ello/heroku-buildpack-imagemagick

I tried running this command:

heroku buildpacks:add https://github.com/ello/heroku-buildpack-imagemagick

Then I repushed my app to the server, and did a restart. The app didn't work. So I tried restarting the dyno using this command:

heroku ps:scale web=1

I get this response, and cannot run the app unless I remove the ImageMagick buildpack:

Scaling dynos... failed ! Couldn't find that formation.

Any idea how I can get ImageMagick properly installed?

Answer 1

I ran into this yesterday. I don't know about your specific instance but in mine, I had added this build pack after my others. It needed to be before.

In addition, I needed to purge the cache. My remote is called production , so I did the following:

heroku plugins:install https://github.com/heroku/heroku-repo.git
heroku repo:purge_cache --remote production
heroku buildpacks:remove https://github.com/ello/heroku-buildpack-imagemagick --remote production
heroku buildpacks:add --index 1 https://github.com/ello/heroku-buildpack-imagemagick --remote production

Then I pushed my repo to --remote production and it worked.