Graceful shutdown handling in Node.js - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to listen for the shutdown signal.

Node.js

process.on('[1]', () => {
  console.log('Shutdown signal received');
});

Drag options to blanks, or click blank then click option'

ASIGINT

BSTART

CRUN

DEXIT

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'EXIT' instead of 'SIGINT' for the shutdown signal.

Confusing signal names like 'START' or 'RUN'.

The SIGINT signal is sent when you press Ctrl+C in the terminal, which is commonly used to trigger graceful shutdown.

2fill in blank

medium

Complete the code to close the HTTP server on shutdown.

Node.js

server.[1](() => {
  console.log('Server closed');
});

Drag options to blanks, or click blank then click option'

Aclose

Bstop

Cshutdown

Dend

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'stop' or 'shutdown' which are not valid server methods.

Using 'end' which is for streams, not servers.

The close method stops the server from accepting new connections and waits for existing connections to finish.

3fill in blank

hard

Fix the error in the shutdown handler to exit the process after closing the server.

Node.js

process.on('SIGTERM', () => {
  server.close(() => {
    [1](0);
  });
});

Drag options to blanks, or click blank then click option'

Aclose

Bstop

Cshutdown

Dexit

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'stop' or 'shutdown' which are not Node.js process methods.

Using 'close' which is a server method, not a process method.

The process.exit(0) command cleanly exits the Node.js process with a success code.

4fill in blank

hard

Fill both blanks to handle multiple shutdown signals and close the server.

Node.js

['SIGINT', '[1]'].forEach(signal => {
  process.on(signal, () => {
    server.[2](() => {
      console.log(`${signal} received, server closed.`);
      process.exit(0);
    });
  });
});

Drag options to blanks, or click blank then click option'

ASIGTERM

BSIGSTART

Cshutdown

Dclose

Attempts:

3 left

💡 Hint

Common Mistakes

Using invalid signal names like 'SIGSTART'.

Using wrong server methods like 'shutdown' instead of 'close'.

SIGTERM is another common shutdown signal. The server's close method stops it gracefully.

5fill in blank

hard

Fill all three blanks to log shutdown start, close server, and log shutdown complete.

Node.js

process.on('SIGINT', () => {
  console.log('[1]');
  server.[2](() => {
    console.log('[3]');
    process.exit(0);
  });
});

Drag options to blanks, or click blank then click option'

AShutdown starting

Bclose

CShutdown complete

DShutdown failed

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong messages that don't match the shutdown steps.

Using wrong server methods like 'stop' instead of 'close'.

Logging before and after closing the server helps track the shutdown process. The server is closed with close.