[SOLVED] What is Instance?

pradeepspa · 10-02-2015, 09:30 AM

Hi Am new to linux. I have came across the concept of instances. "Running multiple instances in server ". I dont understand what instances means neither i dont find any explanation for that.Can anyone help me out explaining what is instance?

Thanks in advance

suicidaleggroll · 10-02-2015, 09:35 AM

http://dictionary.reference.com/browse/instance

Quote:

instance
noun
1. a case or occurrence of anything

If you're running two instances of a program, then you're running two copies of it at the same time.

cliffordw · 10-02-2015, 09:36 AM

Hi there,

Welcome to LQ.

In what context did you come across this statement - what were you reading about?

Instances can mean a couple of things, including:

* multiple copies of a process, for example the "bash" process if you're logged in via more than one window/terminal/session
* multiple copies of an application (which may consist of more than one process in itself), for example Firefox, Apache or MySQL
* multiple Linux instances, if you're running some virtual machines
* containers

szboardstretcher · 10-02-2015, 09:36 AM

You can run Apache on a server right? In the Linux world, you can run 5 Apache's on a server as well. And each of those Apache's would be considered an 'instance.'

pradeepspa · 10-02-2015, 09:37 AM

Thanks for responding.

pradeepspa · 10-02-2015, 10:17 AM

I came across in nagios. "Multiple nagios instances running"