add docker heartbeat

[Courey]

Description

This creates a heartbeat that checks to see if the main process is still running every 10 seconds. If the main process is running, it waits another 10 seconds before checking again. If the main process is not running, it kills the docker container by id.

Related Issue(s)

Resolves #34

Testing

I have just tested this locally on mac.

[lpsinger]

ps` may not be present on Windows systems. There are other ways to check if the erstwhile parent process is still running.

[lpsinger]

The child_process.fork method will launch a new Node.js process with an interprocess communication channel between the parent and the chid processes.

[Courey]

The child_process.fork method will launch a new Node.js process with an interprocess communication channel between the parent and the chid processes.

Where is it forking? to create the monitoring process, I spawn it in detached mode with stdio ignored, there is no channel between the parent and child.

[Courey]

and it's unreffed for complete separation.

[lpsinger]

The child_process.fork method will launch a new Node.js process with an interprocess communication channel between the parent and the chid processes.

Where is it forking? to create the monitoring process, I spawn it in detached mode with stdio ignored, there is no channel between the parent and child.

I don't understand your question. I think that you are confusing interprocess communication and stdin/stdout.