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A systemd service fails to start with error: Permission denied. What is the most probable cause?

medium📝 Debug Q7 of 15
Raspberry Pi - Automation and Scheduling
A systemd service fails to start with error: Permission denied. What is the most probable cause?
AThe service file is in the wrong directory
BThe ExecStart script lacks execute permission
CThe service is not enabled
DThe service file is missing the Description field
Step-by-Step Solution
Solution:

  1. Step 1: Analyze the error message

    Permission denied usually means the script cannot be executed due to file permissions.

  2. Step 2: Check script permissions

    The script in ExecStart must have execute permission for the user running the service.

  3. Final Answer:

    The ExecStart script lacks execute permission -> Option B

  4. Quick Check:

    Permission denied = missing execute permission [OK]
Quick Trick: Make script executable with chmod +x [OK]
Common Mistakes:
MISTAKES
  • Ignoring file permissions
  • Assuming missing Description causes permission error
  • Confusing enablement with permission issues

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