Docker Notes -1

 docker-compose down --rmi -all

how do we run two OS in one machine - Using Hypervisor

OS1  | OS2

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Hypervisor

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Machine OS

Hypervisor : Virtual Box, VMVare, Hyper-v(only Windows)

Benifit creating Virtual machine

Run application in isolation

same application using different version

eg:

virtual Machine1{App1 with Node14, Mongo 4}

virtual Machine2{App2 with Node9, Mongo 3}

Problems with VMs

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Each machine needs full-blown OS (license)

Slow to start ( cause entire OS needs to start just as a normal machine)

Resource intensive ( takes certain Hardware - RAM, cpu ..)

Containers

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Allow running multiple apps in isolation(same kind of a isolation)

light weight

Use OS of the host ( share)

Start quickly ( OS already started)

need less hardware resources

so can run more containers compared to vms

docker run client - server architecture

client communicate using RESTApi

server --> docker engine

technically container is a process

basically all containers use kernal of the host

kernal - manages all applications and hardware