systemd service for auto-start in Raspberry Pi - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this systemd service status command?

Given the following systemd service file content, what will be the output of systemctl status myscript.service after enabling and starting the service successfully?

Raspberry Pi

[Unit]
Description=My Script Service
After=network.target

[Service]
ExecStart=/usr/bin/python3 /home/pi/myscript.py
Restart=on-failure

[Install]
WantedBy=multi-user.target

A Active: active (running) since <timestamp>; Main PID: <pid> (python3)

B Active: inactive (dead) since <timestamp>

C Failed to start myscript.service: Unit not found.

D Active: activating (start) since <timestamp>

💡 Hint

Think about what happens when a service is enabled and started without errors.

When a systemd service is enabled and started successfully, the status shows it as active (running) with the main process ID and timestamp.

🧠 Conceptual

intermediate

Which section of a systemd service file controls when the service starts?

In a systemd service file, which section defines the conditions or targets that determine when the service should start automatically?

A [Unit]

B [Install]

C [Service]

D [Timer]

💡 Hint

Look for the section that mentions 'WantedBy' or 'RequiredBy'.

The [Install] section specifies the target under which the service will be enabled to start automatically, such as multi-user.target.

🔧 Debug

advanced

Why does this systemd service fail to start?

This systemd service file fails to start the script. What is the cause?

Raspberry Pi

[Unit]
Description=Test Service

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

[Install]
WantedBy=multi-user.target

A The ExecStart path lacks the interpreter, causing a permission error.

B The [Unit] section is missing the After=network.target line.

C The service file is missing the Restart=always directive.

D The WantedBy target is incorrect; it should be graphical.target.

💡 Hint

Consider how systemd executes scripts and what is needed to run a Python script.

ExecStart must specify the interpreter or the script must be executable with a shebang. Without it, systemd cannot run the script.

📝 Syntax

advanced

Identify the syntax error in this systemd service file snippet

Which option shows the correct syntax for the ExecStart line in a systemd service file?

Raspberry Pi

[Service]
ExecStart=python3 /home/pi/myscript.py

A ExecStart=>python3 /home/pi/myscript.py

B ExecStart: python3 /home/pi/myscript.py

C ExecStart = python3 /home/pi/myscript.py

D ExecStart=python3 /home/pi/myscript.py

💡 Hint

Check the correct assignment operator and spacing in systemd unit files.

The correct syntax uses '=' without spaces around it. Other options use invalid characters or spacing.

🚀 Application

expert

How to ensure a systemd service restarts automatically on failure?

You want your Raspberry Pi systemd service to restart automatically if the script crashes. Which option correctly adds this behavior?

Raspberry Pi

[Service]
ExecStart=/usr/bin/python3 /home/pi/myscript.py

A Add RestartSec=5 under the [Unit] section

B Add Restart=always under the [Install] section

C Add Restart=on-failure under the [Service] section

D Add Restart=on-abort under the [Service] section

💡 Hint

Restart directives belong in the [Service] section and control restart behavior on failure.

Restart=on-failure in [Service] tells systemd to restart the service if it exits with an error.