Containers provide a way to run multiple applications on a single server through isolation and virtualization. This solves problems of inefficient resource usage when running each app on its own server, as well as dependency conflicts between apps. Containers make deployment and scaling easier through their lightweight and self-contained nature, which can be automated using orchestration tools. Docker is a platform that uses containers to package and run applications. Images define the content of a container, and multiple containers can be run from a single image. Containers are isolated from each other but can communicate through defined channels.

1. Docker - The Big Picture
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2. Problem 1
During bad olden days, the single app runs on a single server. If a business have
multiple applications, they intended to run these applications on multiple different
servers which results in wastage of money, resource and time. So, the one question
comes to your mind is that “Can’t we run multiple applications on a single server ?”
Yes, We can!.

3. Solutions 1 - Virtualization

4. “Can we Do BETTER?”
YES. “CONTAINERS comes into picture.”

5. Solution 2 - Containers

6. Problem 2 - DevOps conflicting goals
Dev Team Seeks Ops Team Seeks
Frequent deployments and updates Stability of production apps
Easy creation of new resources Manage infrastructure, not applications
Monitoring and control

7. Solution - Containers
Containers make deployment easy. Deploying is as simple as running
a new container, routing users to the new one, and trashing the old
one. It can even be automated by orchestration tools. Since it’s so easy,
we can afford to have many containers serving a single application
for increased stability during updates.

8. Problem 3 - Dependency Conflicts

9. Solution - Container
Containers solve this problem since
each app will run inside its own
container with its own dependencies.

10. Problem 4 - Scaling & Seamless Upgrades

11. Solution - Container & Orchestrator
When using an orchestrator,
you merely need to state how
many containers you want
and the image name and the
orchestrator creates that
many containers on all of
your Docker servers

12. What is Docker?
Docker is a set of platform as a
service (PaaS) products that use
OS-level virtualization to
deliver software in packages
called CONTAINERS.

13. What is Container?
Containers are isolated from
one another and bundle their
own software, libraries and
configuration files
They can communicate with
each other through well-
defined channels

14. What is Container?
A container is what we eventually want
to run and host in Docker.
It cannot see the other containers,
physical storage, or get incoming
connections unless you explicitly state
that it can.

15. What is Images?
Any container that runs is created from an
image. An image describes everything that
is needed to create a container; it is a
template for containers. You may create
as many containers as needed from a single
image.

16. What is Registry?
Images are stored in a registry. In the
example above, the app2 image is used
to create two containers.
Each container lives its own, and they
both share a common root: their image
from the registry.

17. Enough talk?
Let's make an awesome with
DOCKER