In brief
 Does Docker replace VM?
 What does it do?
 Is Docker useful for
developers or only for
system admins?
 What problems ...
 A virtual machine (VM) is an operating system or
application environment that is installed on software,
which imitates d...
 Docker is a tool designed to make it easier to create,
deploy, and run applications by using containers.
 Docker contai...
Virtual Machines Docker
Each VM has its own OS Shares the kernel with other
containers
Virtual machine images are
signific...
 Clearly—for DevOps and CI/CD initiatives—application portability and
consistency are crucial needs that Docker fulfills ...
 Use Docker as version control system for your entire app's operating system
 Use Docker when you want to distribute/col...
 The Amazon AMI Marketplace is the closest thing to the Docker Index that you
will find. With AMIs, you can only run them...
 The collaboration features (docker push and docker pull) are one of the most
disruptive parts of Docker.
 With Docker p...
It works on my
machine but
not on yours
I have been
helping the [new
hire] setup her
environment all
day
I can’t try it
be...
Create a local
Docker
container
Distribute it to
private or
public
collaborators
Enhance
collaboratively
Create a
producti...
 Container - a runtime instance of a Docker image.
 Image - an ordered collection of root filesystem changes and executi...
 Docker can build images automatically by reading the instructions from a
Dockerfile.
 A Dockerfile is a text document t...
FROM ubuntu
MAINTAINER MyName
RUN apt-get update
RUN apt-get install -y nginx
COPY index.html
/usr/share/nginx/html/
ENTRY...
Build An Image
$ docker build -t gvacca/nginx .
Store image in a registry
(public, e.g. Dockerhub, or
private)
$ docker pu...
 Docker Machine: Provides a CLI to quickly provision a Docker Host. Deploys
locally or on a Cloud Provider AWS, Azure, GC...
 Docker Hub is a cloud hosted service from Docker that provides registry
capabilities for public and private content.
 I...
Thank You!
mailto: ritukamthan@gmail.com
Docker In Brief
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Docker In Brief

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A brief about Docker

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Docker In Brief

  1. 1. In brief
  2. 2.  Does Docker replace VM?  What does it do?  Is Docker useful for developers or only for system admins?  What problems does it solves?
  3. 3.  A virtual machine (VM) is an operating system or application environment that is installed on software, which imitates dedicated hardware.  The end user has the same experience on a virtual machine as they would have on dedicated hardware.  Specialized software, called a hypervisor or Virtual Machine Monitor, emulates the PC client or server's CPU, memory, hard disk, network and other hardware resources completely, enabling virtual machines to share the resources.  Virtualization limits costs by reducing the need for physical hardware systems.
  4. 4.  Docker is a tool designed to make it easier to create, deploy, and run applications by using containers.  Docker containers wrap a piece of software in a complete filesystem that contains everything needed to run: code, runtime, system tools, system libraries – anything that can be installed on a server.  Containers running on a single machine share the same operating system kernel.  It gives a significant performance boost and reduces the size of the application.  Docker gives you the ability to snapshot the OS into a shared image, and makes it easy to deploy on other docker hosts. Locally, dev, qa, prod, etc.: all the same image.
  5. 5. Virtual Machines Docker Each VM has its own OS Shares the kernel with other containers Virtual machine images are significantly large Containers have much smaller footprint comparatively. A virtual machine could take up several minutes to create and launch. A container can be created and launched just in a few seconds Benefits: security and isolation. Benefits: easier and more lightweight to deploy and faster to start up In IaaS use cases, machine virtualization is an ideal fit. Containers are best suited for packaging/shipping portable and modular software
  6. 6.  Clearly—for DevOps and CI/CD initiatives—application portability and consistency are crucial needs that Docker fulfills quite nicely.  Simply put, containers provide OS-level process isolation whereas virtual machines offer isolation at the hardware abstraction layer.  Again, the two technologies can be used in conjunction with each other for added benefits—for example, Docker containers can be created inside VMs to make a solution ultra-portable.  For now, Docker doesn’t replace VM.
  7. 7.  Use Docker as version control system for your entire app's operating system  Use Docker when you want to distribute/collaborate on your app's operating system with a team  Use Docker to run your code on your laptop in the same environment as you have on your server (try the building tool)  Use Docker whenever your app needs to go through multiple phases of development (dev/test/qa/prod)  Use Docker with your Chef Cookbooks and Puppet Manifests
  8. 8.  The Amazon AMI Marketplace is the closest thing to the Docker Index that you will find. With AMIs, you can only run them on Amazon. With Docker, you can run the images on any Linux server that runs Docker.  The Warden project is a LXC manager written for Cloud Foundry without any of the social features of Docker like sharing images with other people on the Docker Index
  9. 9.  The collaboration features (docker push and docker pull) are one of the most disruptive parts of Docker.  With Docker pull/push the developers and ops guys, have first time been able to easily collaborate quickly on building infrastructure together.  The developers can focus on building great applications and the ops guys can focus on building perfect service containers.  The app guys can share app containers with ops guys and the ops guys can share MySQL and PosgreSQL and Redis servers with app guys.
  10. 10. It works on my machine but not on yours I have been helping the [new hire] setup her environment all day I can’t try it because IT hasn’t updated dev- environment I have to work directly on production environment to fix this issue.
  11. 11. Create a local Docker container Distribute it to private or public collaborators Enhance collaboratively Create a production Docker image Pull it in local development environment. Work on “just like prod” environment Keep multiple Docker images Switch between Docker images as you switch projects Be more productive Release new Docker image per product release Keep the system inconsistencies in Limit Be more consistent
  12. 12.  Container - a runtime instance of a Docker image.  Image - an ordered collection of root filesystem changes and execution parameters for use within a running container.  Layer - a “slice” of the container filesystem; one layer is created by each Dockerfile instruction.  Dockerfile - a text script that contains the commands you execute to build a Docker image.  Registry - a repository of images. It can be public or private. This is a web service.
  13. 13.  Docker can build images automatically by reading the instructions from a Dockerfile.  A Dockerfile is a text document that contains all the commands a user could call on the command line to assemble an image.  Using docker build users can create an automated build that executes several command-line instructions in succession.
  14. 14. FROM ubuntu MAINTAINER MyName RUN apt-get update RUN apt-get install -y nginx COPY index.html /usr/share/nginx/html/ ENTRYPOINT [“/usr/sbin/nginx”,”- g”,”daemon off;”] EXPOSE 80 Select the base image Set the author Add new layer on the image specify the default app that you want to run
  15. 15. Build An Image $ docker build -t gvacca/nginx . Store image in a registry (public, e.g. Dockerhub, or private) $ docker push gvacca/nginx Pull image on the target host $ docker pull gvacca/nginx Run container on the target host $ docker run -it gvacca/nginx
  16. 16.  Docker Machine: Provides a CLI to quickly provision a Docker Host. Deploys locally or on a Cloud Provider AWS, Azure, GCE, DO, Rackspace, VMWare, etc…  Docker Registry: Store and distribute your docker container images. Docker Hub makes it easy: hub.docker.com.  Docker Swarm: Exposes several Docker Engines as a single virtual Engine. Serves the standard Docker API. Swarm is production ready Docker CLI.
  17. 17.  Docker Hub is a cloud hosted service from Docker that provides registry capabilities for public and private content.  In Docker Hub, you usually put Docker Images that can be used/searched by other Docker users.  Docker Hub lets developers store and distribute their images with ease. You can search some ready to go building blocks for your infrastructure.  Quickly create an organization, add users or create groups of users to collaborate with your repositories.  Browse and search any public Docker image repositories for popular content.  Share your images with the community or host in private repositories for secure collaboration with your team
  18. 18. Thank You! mailto: ritukamthan@gmail.com

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