mayank123-code/apm-node-example

A mini process manager example in 250 lines.

apm-node-example

Introduction

This repository is created as the main resource of the sharing titled Implement a Process Manager in 250 lines aims to demostrate the essential components of a process manager.

The mini process manager is named as apm, the short form of Anyone's Process Manger. I expect this workable example to be a learning resource and reference for developing a completed and robust Process Manager.

Read the following content for the guidance of getting started and check the issues for the detailed explanation of code.

(back-story) Initially, the project was planned of about 150 line code before I started to code and realized, however, it's impossible to finish the task in such a limited restrication. Thus I extended the number to 250 afterwhile.

Getting Started

Prompt the following code to start:

$ git clone https://github.com/DemoHn/apm-node-example.git && cd apm-node-example
$ npm install
$ ./bin/apm list  # check if works

If everything is OK, the following will output:

[apm] start daemon
[apm] create daemon -> PID: 6796

ID	STATUS	PID
=============================

That's it!

Available Commands

1. Create & start an instance with specific command:
   ./bin/apm start --command <cmd> --cwd <cwd>

2. Start an existing instance:
   ./bin/apm start --id <instID>

3. Stop an instance:
   ./bin/apm stop --id <instID>

4. List all instances:
   ./bin/apm list