Docker overview and key features in Docker 1.5

1. Microservices Meetup – March 2015

2. 2March 21, 2015
Agenda
• Docker Introduction
• Docker 1.5 Features
• Docker Networking
• Q & A

3. 3March 21, 2015
Speakers
• Ritesh Patel
o Co-founder at Nirmata (@NirmataCloud)
o Previously at Brocade, Trapeze Networks
o @riteshdp
• Srini Seetharaman
o Cloud Platform Architect at Infinera
o Previously SDN at Deutsche Telekom and Stanford OpenFlow group
o @sdn_hub

4. 4March 21, 2015
What is Docker?
• Open source technology to build, ship and run distributed
applications
• An application and its dependencies is packaged into Linux containers
• Provides efficient image management
o Multi layered images, shared across containers
o Image registry = Git for Docker images
Benefits:
• Ideal delivery vehicle for a microservices
• Clear separation of concerns
• Application runtime portability
DevOps

5. 5March 21, 2015
Containers versus VMs
Virtual Machine
Docker
• Containers include only the app and its
dependencies
• Containers share the same Host OS, no guest
OS
• Containers run as isolated user space processes
• Containers starts in few ms versus minutes for
VMs
• Containers achieve better application density

6. 6March 21, 2015
Inside the container

7. 7March 21, 2015
Docker basics

8. 8March 21, 2015
Docker commands
For a comprehensive CLI reference: http://docs.docker.com/reference/commandline/cli/

9. 9March 21, 2015
Docker 1.5

10. 10March 21, 2015
Key Features
• Read-only containers
• Container statistics
• Named Dockerfiles
• Full IPv6 support
• Other
o Container rename
o New version of registry http API

11. 11March 21, 2015
Container statistics
docker stats CONTAINER [CONTAINER...]
• Returns a live stream of stats for running containers
• Can be run on multiple containers
• API endpoint provides more stats
$ sudo docker stats redis1 redis2
CONTAINER CPU % MEM USAGE/LIMIT MEM % NET I/O
redis1 0.07% 796 KiB/64 MiB 1.21% 788 B/648 B
redis2 0.07% 2.746 MiB/64 MiB 4.29% 1.266 KiB/648 B

12. 12March 21, 2015
Read-only containers
--read-only
• Allows the container's root filesystem to be mounted as read only
• Can be used in combination with volumes to force a container's
process to only write to locations that will be persisted.
• Use case:
o Allow admins to control where they would like developers to write files and
error on any other locations.

13. 13March 21, 2015
Named Dockerfiles
sudo docker build -f
• Allows the definition of multiple Dockerfiles for a single
project
$ sudo docker build -f dockerfiles/Dockerfile.debug –t app_debug .
$ sudo docker build -f dockerfiles/Dockerfile.prod -t app_prod .

14. 14March 21, 2015
Docker exec
docker exec [OPTIONS] CONTAINER COMMAND [ARG...]
• Runs a new command in a running container
• Only works if the container is running (i.e. not paused/stopped)
• Does not restart if the container is restarted
$ sudo docker run –d –-name mongo mongo
$ sudo docker exec –it mongo /bin/bash

15. signup at http://nirmata.io
Multi-cloud container services for Enterprise DevOps