Process management with supervisor in Raspberry Pi - Mini Project: Build & Apply

Process Management with Supervisor on Raspberry Pi

📖 Scenario: You have a Raspberry Pi running several small programs. You want to make sure these programs start automatically and keep running even if they crash. Supervisor is a tool that helps manage these programs easily.

🎯 Goal: You will create a Supervisor configuration file to manage a simple Python script as a process. You will set up the configuration, start Supervisor, and check the process status.

📋 What You'll Learn

Create a Supervisor configuration file for a Python script

Set up a program section with the correct command and settings

Reload Supervisor to apply the configuration

Check the status of the managed process

💡 Why This Matters

🌍 Real World

Supervisor helps keep important programs running on devices like Raspberry Pi without manual restarts.

💼 Career

Understanding process management with Supervisor is useful for system administrators and developers managing services on Linux-based systems.

1

Create a simple Python script

Create a Python script called hello.py that prints "Hello from Supervisor!" and then waits for 60 seconds. Write exactly these two lines in the script.

Raspberry Pi

# Create hello.py with the required two lines
# Your code here

Need a hint?

Use print() to show the message and time.sleep(60) to pause.

2

Create Supervisor configuration file

Create a Supervisor configuration file named hello.conf with a [program:hello] section. Set command=python3 /home/pi/hello.py, autostart=true, and autorestart=true exactly as shown.

Raspberry Pi

print("Hello from Supervisor!")
import time
time.sleep(60)

# Create hello.conf with the program section and settings
# Your code here

Need a hint?

The file must start with [program:hello] and include the exact command and options.

3

Reload Supervisor to apply configuration

Run the command sudo supervisorctl reread followed by sudo supervisorctl update to reload Supervisor and apply the new hello.conf configuration.

Raspberry Pi

[program:hello]
command=python3 /home/pi/hello.py
autostart=true
autorestart=true

# Run commands to reload Supervisor
# Your code here

Need a hint?

Use these two commands exactly to reload Supervisor's configuration.

4

Check the status of the managed process

Run the command sudo supervisorctl status hello to check if the hello program is running under Supervisor.

Raspberry Pi

sudo supervisorctl reread
sudo supervisorctl update

# Check the status of hello program
# Your code here

Need a hint?

This command shows if the program is running or stopped.