Remote monitoring and management in Raspberry Pi - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

Check Raspberry Pi CPU temperature remotely

You want to check the CPU temperature of a Raspberry Pi remotely using SSH. Which command will correctly show the CPU temperature in Celsius?

A ssh pi@raspberrypi 'top -bn1 | grep Cpu'

B ssh pi@raspberrypi 'cat /sys/class/thermal/thermal_zone0/temp'

C ssh pi@raspberrypi 'df -h'

D ssh pi@raspberrypi 'vcgencmd measure_temp'

💡 Hint

The Raspberry Pi has a special command to measure CPU temperature in a human-readable format.

The vcgencmd measure_temp command returns the CPU temperature in Celsius with a readable format like temp=45.0'C. Option D returns the temperature in millidegrees Celsius as a number, not formatted. Options C and D show CPU usage and disk space, not temperature.

🔀 Workflow

intermediate

Set up automatic system health reports via email

You want to automate sending a daily system health report from your Raspberry Pi to your email. Which sequence of steps is correct?

A 1,2,4,3

B 1,2,3,4

C 2,3,1,4

D 2,1,3,4

💡 Hint

Think about writing the script first, then configuring mail, then scheduling, and finally testing.

First, you write the script to collect data. Then install and configure the mail utility to send emails. Next, schedule the script with cron to run daily. Finally, test the script manually to ensure it works.

❓ Troubleshoot

advanced

Diagnose failed SSH connection to Raspberry Pi

You try to SSH into your Raspberry Pi but get the error: Permission denied (publickey,password). What is the most likely cause?

A The Raspberry Pi is powered off.

B The Raspberry Pi's SSH service is not running.

C The SSH public key is not added to the Pi's authorized_keys file.

D The network cable is unplugged.

💡 Hint

This error usually means authentication failed, not network or power issues.

The error Permission denied (publickey,password) means the server rejected your authentication. The most common cause is that your public key is missing or not authorized on the Pi. If SSH service was down or the Pi was off, you'd get a timeout or connection refused error instead.

🧠 Conceptual

advanced

Understanding remote monitoring agents on Raspberry Pi

Which statement best describes the role of a remote monitoring agent installed on a Raspberry Pi?

A It collects system metrics and sends them to a central server for analysis.

B It blocks unauthorized network connections to the Raspberry Pi.

C It automatically updates the Raspberry Pi's operating system daily.

D It creates backups of all files on the Raspberry Pi to an external drive.

💡 Hint

Think about what monitoring means in a networked environment.

A remote monitoring agent's main job is to gather data like CPU load, memory usage, and disk space, then send this data to a central server or dashboard for monitoring. It does not block connections, update OS, or create backups.

✅ Best Practice

expert

Secure remote monitoring setup for Raspberry Pi

You want to set up secure remote monitoring on your Raspberry Pi accessible over the internet. Which practice is the best to ensure security?

A Use a VPN to connect securely to your home network before accessing the Raspberry Pi.

B Open the Raspberry Pi SSH port directly to the internet with password authentication enabled.

C Disable all firewalls to avoid connection issues during monitoring.

D Use default usernames and passwords for easy access.

💡 Hint

Think about how to protect your device from unauthorized internet access.

Using a VPN creates a secure tunnel to your home network, protecting your Raspberry Pi from direct exposure to the internet. Opening SSH directly with password authentication is risky. Disabling firewalls reduces security. Default credentials are a major security risk.