Overview
A deployment failure can occur in your environment due to a mismatch between the versions of a gem specified in the Gemfile and the Gemfile.lock. This issue is often indicated by error messages during the deployment process. A common scenario is when a gem, such as Sidekiq, is updated in the Gemfile but the Gemfile.lock is not updated to reflect this change, causing a conflict during deployment.
The error message will include this excerpt:
You are trying to install in deployment mode after changing your Gemfile. Run `bundle install` elsewhere and add the updated Gemfile.lock to version control.
Solution
To resolve this issue, follow these steps:
- Run `bundle install` locally. This will update the Gemfile.lock to reflect the changes made in the Gemfile.
- Push the updated Gemfile.lock to your repository.
- Redeploy your application.
After these steps, the updated version of your gem should be running successfully in your environment.
Summary
Deployment failures due to a mismatch between the Gemfile and Gemfile.lock can be resolved by running `bundle install` locally to update the Gemfile.lock, pushing the changes to the repository, and then redeploying the application.
FAQ
-
What does `bundle install` do?
It updates the Gemfile.lock to reflect any changes made in the Gemfile. -
What happens if I don't update the Gemfile.lock after changing the Gemfile?
It can cause a conflict during the deployment process, leading to a deployment failure. -
How can I confirm that the updated version of the gem is running successfully?
After redeploying your application, you can check the version of the gem in your environment to confirm.
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