The app crashes

The app stopped with an error while Ferry waited for its health check.

What you see

Deploy log

==> Deploy failed: instance d1c6b8 crashed (exit code 1)

The deploy gets the status deploy_failed. The previous deploy continues to answer.

The app stopped while Ferry waited for its health check. The exit code is not 0, thus the app stopped with an error.

Some exit codes add a hint, such as 127: command not found, check the start command.

Read the last lines of the output of the instance. Ferry copies them into the deploy log, immediately above the error.

Terminal

ferry logs --deploy DEPLOY_ID

Correct the cause, then deploy again.

The health check path answers with an error

The health check path does not exist in the app, or it answers with a status of 400 or more.

The app exits immediately

The command of the instance ends without an error, but a web service must continue to run.