Just a description of docker

1. Docker

2. Content
 Docker
 Virtual Machine
 Difference bw Docker and VM
 Advantage
 Docker Files
 Docker Image
 Docker Containers

3. Docker
 Docker is an open platform for developing,
shipping, and running applications.
 Docker enables you to separate your
applications from your infrastructure so you
can deliver software quickly.
 With Docker, you can manage your
infrastructure in the same ways you manage
your applications.
 Docker reduce the delay between writing code
and running it in production.

4. DOCKER ARCHITECTURE

5. Why docker?
Virtual Machine
 A virtual machine is capable of performing
tasks such as running applications and
programs
 A host can have several virtual machines
running at a specific time.
 Docker containers are much smaller and
require far fewer resources than a VM.
 The lightweight architecture of Docker
containers is less resource-intensive than

6. The docker containers are suited for situations
where you want to run multiple applications
over a single operating system

7. Difference between Docker and VM
DOCKER VIRTUAL MACHINE
Boot-Time Boots in a few seconds. It takes a few minutes
for VMs to boot.
Runs on Dockers make use of the
execution engine.
VMs make use of the
hypervisor .
Memory Efficiency No space is needed to
virtualize, hence less
memory.
Requires entire OS to be
loaded before starting
the surface, so less
efficient.
Deployment Deploying is easy as only
a single image,
containerized can be
used across all
platforms.
Deployment is
comparatively lengthy as
separate instances are
responsible for
execution.

8. Advantage
 App run separately from each other (Isolate
from each other)
 Less OS maintenance.
 Efficient.
 Fast deployment.
 Docker provides speed & efficiency over the
traditional virtualized hardware.
 Each & every separate app have their own
dependencies.

9. Example For Docker

16. How Docker Works?
Three different stages for containers working in a
dockerized environment.
 Docker Image
 Docker Containers
 Dockerfile

17. Docker Images
# docker pull nginx

18. List docker images
# docker images

19. Docker container
 Clones/Copy the above docker image and
make it as a containers which is then ready to
execute.
Create Docker Container
# docker run -d --name clx_server1 -p 80:80 nginx:latest

20. Docker container
 List running Docker containers
# docker ps
 List all Docker containers
# docker ps –a

21. Start Container
 Start a Container
# docker start clx_server1
 Stop a Container
# docker stop clx_server1

22. Docker File

23. Build Docker File
 Build docker image from Dockerfile
# docker build -t webserver .

24. Thank You