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Debugging Applications

This is a collection of tips and techniques for debugging applications effectively.

Sleep​

Sometimes your application will crash on startup before you can go into the shell. In such cases, you can add a sleep command in the app spec:

name: my-app
services:
  - name: app-svc
    containers:
      - name: app
        cmd:
          - sleep
          - infinity

This will keep the application running indefinitely, allowing you to exec into the container and investigate the issue.

Run the Application Manually​

Once you have exec'd into the container, you can try running the application manually to see any error messages or logs that might not be captured otherwise. For example: