What are core files by node.js [closed]-Collection of common programming errors

As shown above, my newly installed node.js app directory has a lot of core.* files. What are these, and what is their purpose? Can I delete these files?

I installed node.js behind apache with mod_proxy to can use one of my domain on port 80. Then I installed forever. Sometimes I have problems stopping node.js with:

`forever stop server.js`

Maybe that is causing those dumps? Can someone explain why these are appearing?

After all the problem found it’s answer my VM’s processes are limited on a given number.Node used with apache seems to be the background

-bash: fork: Cannot allocate memory