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Raspberry Piprogramming~5 mins

systemd service for auto-start in Raspberry Pi - Cheat Sheet & Quick Revision

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Recall & Review
beginner
What is a systemd service file used for in Raspberry Pi?
A systemd service file tells the Raspberry Pi how to start, stop, and manage a program automatically when the system boots or shuts down.
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beginner
Which directory usually holds systemd service files for user services?
User systemd service files are usually stored in ~/.config/systemd/user/.
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intermediate
What is the purpose of the [Service] section in a systemd service file?
The [Service] section defines how the program runs, including the command to start it (ExecStart) and how it behaves.
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beginner
How do you enable a systemd service to start automatically on boot?
You run sudo systemctl enable service_name.service to make the service start automatically when the Raspberry Pi boots.
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beginner
What command shows the status and logs of a systemd service?
Use sudo systemctl status service_name.service to see if the service is running and check recent logs.
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Where do you place a systemd service file to make it available system-wide?
A/home/pi/
B/usr/local/bin/
C/etc/systemd/system/
D/var/log/
Which command starts a systemd service immediately without rebooting?
Asudo systemctl stop service_name.service
Bsudo systemctl enable service_name.service
Csudo systemctl status service_name.service
Dsudo systemctl start service_name.service
What does the ExecStart line in a systemd service file specify?
AThe command to run the program
BThe user who owns the service
CThe service description
DThe service dependencies
How do you reload systemd to recognize a new or changed service file?
Asudo systemctl restart
Bsudo systemctl daemon-reload
Csudo systemctl reload
Dsudo systemctl enable
Which section in a systemd service file describes when the service should start?
A[Unit]
B[Service]
C[Install]
D[Timer]
Explain how to create and enable a systemd service to auto-start a Python script on Raspberry Pi boot.
Think about the steps from writing the file to making it run automatically.
You got /6 concepts.
    Describe the role of the [Install] section in a systemd service file.
    It connects the service to system startup targets.
    You got /3 concepts.

      Practice

      (1/5)
      1. What is the main purpose of creating a systemd service on a Raspberry Pi?
      easy
      A. To update the Raspberry Pi operating system
      B. To manually run a program only once
      C. To make a program start automatically when the Raspberry Pi boots
      D. To uninstall software from the Raspberry Pi

      Solution

      1. Step 1: Understand systemd service purpose

        A systemd service is designed to manage programs and make them start automatically during boot.

      2. Step 2: Identify the correct use case

        Starting a program automatically on boot matches the purpose of systemd services.

      3. Final Answer:

        To make a program start automatically when the Raspberry Pi boots -> Option C

      4. Quick Check:

        systemd service = auto-start program [OK]
      Hint: Remember: systemd services auto-start programs on boot [OK]
      Common Mistakes:
      • Confusing systemd with manual program execution
      • Thinking systemd updates the OS
      • Believing systemd uninstalls software
      2. Which of the following is the correct section header in a systemd service file to define the program to run?
      easy
      A. [Service]
      B. [Unit]
      C. [Install]
      D. [Program]

      Solution

      1. Step 1: Recall systemd service file structure

        A systemd service file has three main sections: [Unit], [Service], and [Install].

      2. Step 2: Identify where the program command goes

        The program to run is specified under the [Service] section using ExecStart.

      3. Final Answer:

        [Service] -> Option A

      4. Quick Check:

        Program command in [Service] section [OK]
      Hint: Program command is always under [Service] section [OK]
      Common Mistakes:
      • Using [Unit] or [Install] for program commands
      • Assuming [Program] is a valid section
      • Confusing section headers
      3. Given this systemd service file snippet:
      [Unit]
Description=My Script

[Service]
ExecStart=/home/pi/myscript.sh

[Install]
WantedBy=multi-user.target

      What command should you run to make this service start automatically on boot?
      medium
      A. sudo systemctl start myscript.service
      B. sudo systemctl enable myscript.service
      C. sudo systemctl reload myscript.service
      D. sudo systemctl stop myscript.service

      Solution

      1. Step 1: Understand difference between start and enable

        Starting runs the service now; enabling sets it to run on boot.

      2. Step 2: Identify command to auto-start on boot

        Use sudo systemctl enable myscript.service to enable auto-start.

      3. Final Answer:

        sudo systemctl enable myscript.service -> Option B

      4. Quick Check:

        Enable = auto-start on boot [OK]
      Hint: Enable service to auto-start, start to run now [OK]
      Common Mistakes:
      • Using start instead of enable for auto-start
      • Confusing reload with enable
      • Stopping service instead of enabling
      4. You created a systemd service file but after reboot, the program does not start. Which of these is the most likely mistake?
      medium
      A. You named the service file with a .txt extension
      B. You used sudo systemctl start instead of enable
      C. You put the program command under the [Unit] section
      D. You forgot to run sudo systemctl daemon-reload after creating the service file

      Solution

      1. Step 1: Understand systemd reload requirement

        After creating or changing service files, systemd must reload to recognize changes.

      2. Step 2: Identify the missing reload command

        Forgetting sudo systemctl daemon-reload means systemd ignores new service files.

      3. Final Answer:

        You forgot to run sudo systemctl daemon-reload after creating the service file -> Option D

      4. Quick Check:

        daemon-reload needed after service file changes [OK]
      Hint: Always run daemon-reload after editing service files [OK]
      Common Mistakes:
      • Skipping daemon-reload after file changes
      • Confusing start and enable commands
      • Placing ExecStart in wrong section
      • Wrong file extension for service files
      5. You want your Raspberry Pi to run a Python script at boot, but only after the network is ready. Which systemd service file snippet correctly ensures this?
      hard
      A. [Unit]\nDescription=Run Python Script\nAfter=network-online.target\nWants=network-online.target\n\n[Service]\nExecStart=/usr/bin/python3 /home/pi/script.py\n\n[Install]\nWantedBy=multi-user.target
      B. [Unit]\nDescription=Run Python Script\nRequires=network.target\n\n[Service]\nExecStart=/usr/bin/python3 /home/pi/script.py\n\n[Install]\nWantedBy=multi-user.target
      C. [Unit]\nDescription=Run Python Script\nBefore=network-online.target\n\n[Service]\nExecStart=/usr/bin/python3 /home/pi/script.py\n\n[Install]\nWantedBy=multi-user.target
      D. [Unit]\nDescription=Run Python Script\nAfter=multi-user.target\n\n[Service]\nExecStart=/usr/bin/python3 /home/pi/script.py\n\n[Install]\nWantedBy=network-online.target

      Solution

      1. Step 1: Understand network dependency in systemd

        To run after network is ready, use After=network-online.target and Wants=network-online.target.

      2. Step 2: Check each option's unit section

        [Unit]\nDescription=Run Python Script\nAfter=network-online.target\nWants=network-online.target\n\n[Service]\nExecStart=/usr/bin/python3 /home/pi/script.py\n\n[Install]\nWantedBy=multi-user.target correctly uses both directives to wait for network online before starting.

      3. Final Answer:

        After=network-online.target and Wants=network-online.target -> Option A

      4. Quick Check:

        Use After and Wants with network-online.target for network wait [OK]
      Hint: Use After=network-online.target and Wants=network-online.target [OK]
      Common Mistakes:
      • Using network.target instead of network-online.target
      • Placing Before=network-online.target instead of After
      • Wrong WantedBy target
      • Missing Wants directive
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