docker, a new linux container technology based light weight virtualization
DESCRIPTION
An Intro to DockerTRANSCRIPT
www.unicomlearning.com
Emerging Technology Emerging Technology Summit 2014Summit 2014
www.cloudandmobility.org
26 Sept, 2014 - Bangalore26 Sept, 2014 - Bangalore
DockerDocker
Suresh BallaSuresh Balla
Principal ConsultantPrincipal Consultant
Neudesic, IndiaNeudesic, India
www.unicomlearning.comAgenda
UNICOM PresentsUNICOM Presents
Emerging Technology Emerging Technology Summit-2014Summit-2014
What?Why?How?Ecosystem?
What is a Docker?
Build, Ship and Run Any App, Anywhere
Lightweight Virtualized Environments
Static website
Web frontend
User DB
Queue Analytics DB
Background workers
API endpoint
nginx 1.5 + modsecurity + openssl + bootstrap 2
postgresql + pgv8 + v8
hadoop + hive + thrift + OpenJDK
Ruby + Rails + sass + Unicorn
Redis + redis-sentinel
Python 3.0 + celery + pyredis + libcurl + ffmpeg + libopencv + nodejs + phantomjs
Python 2.7 + Flask + pyredis + celery + psycopg + postgresql-client
Development VM
QA server
Public Cloud
Disaster recovery
Contributor’s laptop
Production Servers
The ChallengeM
ultip
licity
of
Stac
ksM
ultip
licity
of
hard
war
e en
viro
nmen
ts Production Cluster
Customer Data Center
Do services and apps interact
appropriately?
Can I migrate
smoothly and quickly?
Slide Reference: DockerCon
Static website Web frontend User DB Queue Analytics DB
Development VM
QA server Public Cloud Contributor’s laptop
Docker containers to rescue M
ultip
licity
of S
tack
sM
ultip
licity
of
hard
war
e en
viro
nmen
ts
Production Cluster
Customer Data Center
Do services and apps interact
appropriately?
Can I migrate
smoothly and quickly
…that can be manipulated using standard operations and run consistently on virtually any hardware platform
An engine that enables any payload to be encapsulated as a lightweight, portable, self-sufficient container…
Slide Reference: DockerCon
VMs vs Bare Containers vs Docker
Hardware
Operating System
Type 2 Hypervisor
Virtual Machine
Operating System
Bins / libs
App App
Virtual Machine
Operating System
Bins / libs
App App
Hardware
Type 1 Hypervisor
Virtual Machine
Operating System
Bins / libs
App App
Virtual Machine
Operating System
Bins / libs
App App
Hardware
Operating System
Container
Bins / libs
App App
Container
Bins / libs
App App
VMs vs Bare Containers vs Docker
Hardware
Operating System
Type 2 Hypervisor
Virtual Machine
Operating System
Bins / libs
App App
Virtual Machine
Operating System
Bins / libs
App App
Hardware
Type 1 Hypervisor
Virtual Machine
Operating System
Bins / libs
App App
Virtual Machine
Operating System
Bins / libs
App App
Hardware
Operating System
ContainerBins / libs
App App
Container
Bins / libs
App App
Docker Workflow
Source Code Repository
Dockerfile
For A
Docker Engine
DockerContainer
Image Registry
Build
Docker
Host 2 OS (Linux)
Container A
Container B
Container C
Container A
Push
Search Pull
Run
Host 1 OS (Linux)
Slide Reference: DockerCon
Docker Architecture• Client Server Architecture
– Sockets or RESTfull API
• Docker Deamon• Docker client• Images – a read-only
templates• Registries - holds images• Container – created from an
image
sudo docker run -i -t ubuntu /bin/bash
• Pulls the ubuntu image• Creates a new container• Allocates a filesystem and mounts a read-write layer• Allocates a network / bridge interface• Sets up an IP address• Executes a process that you specify• Captures and provides application output
Docker CLI• docker search• docker pull• docker run• docker commit• docker inspect• docker push• docker images
Demo
Setup• On your servers (LINUX)
– Packages (Ubuntu, Debian, Fedora etc.)– Single Binary install – Easy provisioning on Rackspace, Digital Ocean, AWS – EC2, GCE,
Windows Azure• On your dev environment
– Vagrant Up– Boot2docker (25 MB VM image)– Natively (If you run Linux)
Linux Kernel 3.8
Technologies
• Go Lang• Open Sourced by DotCloud March
2013• Libcontainer - cgroups, namespaces
– LXC as default environments in versions < 0.9
Authoring Images with Dockerfile# DOCKER-VERSION 0.10.0
# Pull base image.FROM ubuntu:14.04
# Install Node.jsRUN apt-get updateRUN apt-get install -y software-properties-commonRUN add-apt-repository -y ppa:chris-lea/node.jsRUN apt-get updateRUN apt-get install -y nodejsRUN apt-get install -y supervisorRUN mkdir -p /var/log/supervisor
ADD . /src
# add the supervisor config file to default location that it would look forADD supervisord.conf /etc/supervisor/conf.d/supervisord.conf
RUN cd /src; npm install
ENV PORT 3001ENV NODE_ENV development
EXPOSE 3001
CMD ["node", "/src/server.js"]
Demo
One Process per Container
Only one process per container
Use supervisor process to launch multiple child process inside the container
Docker Hub• SaaS offerings - Public and private repositories
• Need your own private registry?– https://github.com/docker/docker-registry– Also a Docker container
Automated Builds
GitHub and BitBucket Integrations
Web Hooks
Build Triggers
Demo
Ecosystem• Cocaine, Dein, Flynn – Private PaaS• CoreOS, full distro based on Docker – Linux Distribution• Red Hat’s Project Atomic - Linux Distribution• Google’s Kubernetes – container management• New Relic Centurian – container management• OpenStack Integration (In Havana, Nova has Docker driver)• Vagrant – Docker provider
Related Open Source LibrariesGo lang based•libcontainer•libchan•libswarm
Use Cases• Cloud9 IDE• eBay• mailGun/Rackspace• CloudFlare• Cambridge Health Care• Red Hat Openshift
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Emerging Technology Emerging Technology Summit-2014Summit-2014
Organized byOrganized byUNICOM Trainings & Seminars Pvt. Ltd. UNICOM Trainings & Seminars Pvt. Ltd.
[email protected]@unicomlearning.com
Suresh BallaSuresh [email protected]@Neudesic.com
www.cloudandmobility.org