More about isolated areas
- Roughly isolated area is analogus to vm but major difference is VMs have a full blow os where as isolated areas (containers) dont have a full blow os.
- Since they dont have full blown os,
- CPU and other resources are allocated to application rather than os
- This reduces the overhead of OS Patching
- Savings on cost as containers on license costs
- Every container (isolate area) gets
- CPU
- RAM
- Storage
- Network (ip address)
- We will be using docker to create these isolated areas called as containers.
- Docker is british expression for Dock Worker who is responsible for loading and unloading container in the ship yard
Intro to Linux Containers
- Modern container started in the Linux world and are product of immense contributions for over a period of time from organizations such as Google LLC
- Some of the major technologies in Linux which contributed to massive growth of containers are
- kernel namespaces
- control groups
- union filesystems
- Docker
Windows Containers
- Microsoft corp has worked along with Docker to bring container technologies to Windows Platform
- Windows Container can be created on
- Window 10 (Non Home editions)
- Windows Server 2016 and Later
- Microsoft had changed the core Window Kernel to implement Containers.
Docker Technology
- When we install docker, we have the following components installed into our machine
- docker client
- docker daemon (engine)
- Login into docker play ground create an instance and execute docker version
- Lets try to create one container
- from docker client we need to specify we need a container
- lets use a simple image called as hello-world
- To run a docker container we need a docker image. Docker has hub which hosts lots of images
- Now lets summarize the steps
- Now lets try to create one more container with hello-world
- So to create container we need images. In reality in container we would want to run our applications developed
- So we need to create images with our applications in it to create containers
- So the first task for us is to understand how to create images so that we can run our applications
- Terminology:
- In case of Docker we will be packaging our applications as Docker images.
