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Whenever you deploy code, change a config var, or add or remove an add-on resource, Heroku creates a new release and restarts your app. You can list the history of releases, and use rollbacks to revert to prior releases for backing out of bad deploys or config changes.
Release are named in the format
NN is an incrementing sequence number for each release.
Releases are created whenever you deploy code. In this example, v10 is the release created by the deploy:
$ git push heroku master ... -----> Compressing... done, 8.3MB -----> Launching... done, v10 http://severe-mountain-793.herokuapp.com deployed to Heroku
Release are created whenever you change config vars. In this example, v11 is the release created by the config change:
$ heroku config:set MYVAR=42 Adding config vars: MYVAR => 42 Updating vars and restarting app... done, v11
And releases are created whenever you add, remove, upgrade, or downgrade add-on resources. In this example, v12 is the release created by the add-on change:
$ heroku addons:create memcachier Adding memcachier to myapp... done, v12 (free)
Listing release history
To see the history of releases for an app:
$ heroku releases Rel Change By When ---- ---------------------- ---------- ---------- v52 Config add AWS_S3_KEY email@example.com 5 minutes ago v51 Deploy de63889 firstname.lastname@example.org 7 minutes ago v50 Deploy 7c35f77 email@example.com 3 hours ago v49 Rollback to v46 firstname.lastname@example.org 2010-09-12 15:32:17 -0700
The number next to the deploy message, for example de63889, corresponds to the commit hash of the repository you deployed to Heroku. Use this to correlate changes in a release with a changes in your code repository. For example:
$ git log -n 1 de63889 commit de63889c20a96347679af2c5160c390727fa6749 Author: <email@example.com> Date: Thu Jul 11 17:16:20 2013 +0200 Fixed listing CSS and localisation of description.
To get detailed info on a release:
$ heroku releases:info v24 === Release v24 Change: Deploy 575bfa8 By: firstname.lastname@example.org When: 6 hours ago Addons: deployhooks:email, releases:advanced Config: MY_CONFIG_VAR => 42 RACK_ENV => production
You cannot roll back to a release which would change the state of add-ons, since this affects billing.
rollback command to roll back to the last release:
$ heroku rollback Rolled back to v51
You may choose to specify another release to target:
$ heroku rollback v40 Rolled back to v40
Rolling back will create a new release which is a copy of the state of the compiled slug and config vars of the release specified in the command. The state of your
heroku Git remote, database, and external state held in add-ons (for example, the contents of memcache) will not be affected and is your responsibility to reconcile with the rollback.
Running on a rolled-back release is meant as a temporary fix to a bad deployment. If you are on a rolled-back release, fix and commit the problem locally, and re-push to Heroku to update the
heroku Git remote and create a new release.