Debug Docker Startup Exit | Dataford Interview Questions

What could be a common reason for Docker to automatically exit within seconds of starting?

Implement most_common_exit_reason(records) to analyze Docker container records and return the most frequent reason among containers that exit within 10 seconds. Each record is [duration_seconds, exit_code, foreground]; a non-foreground process indicates a daemon that was not kept running, exit code 0 indicates normal process completion, and any other exit code indicates a crash. Return "unknown" if no record qualifies. If counts tie, return the reason appearing first in the input.

Constraints

1 <= records.length <= 10000
Each record contains exactly [duration_seconds, exit_code, foreground]
0 <= duration_seconds <= 86400
-255 <= exit_code <= 255
foreground is a boolean
Only records lasting at most 10 seconds are considered

Function Signature

def most_common_exit_reason(records):

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Problem

What could be a common reason for Docker to automatically exit within seconds of starting?

Constraints

1 <= records.length <= 10000
Each record contains exactly [duration_seconds, exit_code, foreground]
0 <= duration_seconds <= 86400
-255 <= exit_code <= 255
foreground is a boolean
Only records lasting at most 10 seconds are considered

Function Signature

def most_common_exit_reason(records):

Your question is Debug Docker Startup Exit. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.