Microservices Meetup – March 2015

2March 21, 2015

Agenda

• Docker Introduction

• Docker 1.5 Features

• Docker Networking

• Q & A

3March 21, 2015

Speakers

• Ritesh Patelo Co-founder at Nirmata (@NirmataCloud)

o Previously at Brocade, Trapeze Networks

o @riteshdp

• Srini Seetharamano Cloud Platform Architect at Infinera

o Previously SDN at Deutsche Telekom and Stanford OpenFlow group

o @sdn_hub

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

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

6March 21, 2015

Inside the container

7March 21, 2015

Docker basics

8March 21, 2015

Docker commands

For a comprehensive CLI reference: http://docs.docker.com/reference/commandline/cli/

9March 21, 2015

Docker 1.5

10March 21, 2015

Key Features

• Read-only containers

• Container statistics

• Named Dockerfiles

• Full IPv6 support

• Othero Container rename

o New version of registry http API

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

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.

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 .

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

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