introducing docker

Docker

Dec 2013

www.anubhaskar.name

Creative Commons Attribution-ShareAlike 3.0 Unported License.

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1.Introduction2.Prototype Architecture3.Prerequisites4.Install & configure Docker5.Install & configure Docker private registry6.Register container image7.Create container in first host8.Create container in second host

AGENDA


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Introduction


Docker is

● An Open source software

● Based on Linux container technology (LXC)

● Configure once...run anywhere approach

● Used to deploy application in a self contained lightweight and isolated Linux container

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Prototype Architecture


dockerreg10.10.10.3/Centos

repo10.10.10.2/Centos

(centos docker imagedownloaded from Internet)

dockerhost110.10.10.4/Centos

Container1PrivateImage

Repository

dockerhost210.10.10.5/Ubuntu

Container2

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Prerequisites


For simplicity and ease of demonstration below changes are made in prototype. These options should be avoided or carefully considered in a production deployment

1. Two hosts are installed with Centos6.3 minimal install cd.

2. Disable SELinux on two hosts# vi /etc/selinux/configSELINUX=disabled

3. Disable firewall on two hosts# chkconfig iptables off

4. Add host names# vi /etc/hosts10.10.10.2 repo10.10.10.3 dockerreg10.10.10.4 dockerhost110.10.10.5 dockerhost2

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Prerequisites


5. Reboot server and client hosts

6. Third host is installed with Ubuntu12.04 server

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Install & configure Docker


1. Install docker in centos hosts repo, dockerhost1

# yum install docker-io

Note: Epel repository should be enabled for docker rpm

2. Start docker service in docker-registry host

# service docker start

3. Install docker in ubuntu host dockerhost2# echo “deb http://get.docker.io/ubuntu docker main > /etc/apt/sources.list.d/docker.list# apt-get update# apt-get install lxc-docker

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Install & configure Docker private registry


1. Install docker's private registry software in host dockerreg

# yum install docker-registry

Note: Epel testing repository should be enabled for docker-registry rpm

2. Start docker-registry service in docker-registry host

# service redis start# service docker-registry start

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Register container image


1. Download centos container image from central repository (index.docker.io) in host repo.

# docker pull centos

2. View the downloaded image details

# docker images

3. Upload the image to local private registry

# docker tag centos dockerreg:5000/os# docker push dockerreg:5000/os

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Create container in first host


1. Start container in dockerhost1# docker run -i -t dockerreg:5000/os /bin/bash

2. Install Apache inside container[container]# yum install httpd[container]# service httpd start[container]# netstat -ntlp[container]# exit

3. Save the container with Apache as new image# docker ps -a# docker commit <container id from above cmd> osweb

4. Upload new image to private registry# docker tag osweb 10.10.10.3:5000/osweb# docker push 10.10.10.3:5000/osweb

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Create container in second host


1. Start container in dockerhost2# docker run -i -t dockerreg:5000/osweb /bin/bash

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THANK YOU


introducing docker

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