A beginner guide to docker for looking up and setting docker image and container

Beginner Docker Guide

DOCKER


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1. First try to find docker version to confirm daemon is running

~$ docker version

Docker Emulator version 0.1.3
 
Emulating:
Client version: 0.5.3
Server version: 0.5.3
Go version: go1.1

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2. Look for available images in the cloud

~$ docker search tutorial

Found 1 results matching your query ("tutorial")
NAME                      DESCRIPTION
learn/tutorial            An image for the interactive tutorial

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3. Download Container images using

~$ docker pull learn/tutorial

Pulling repository learn/tutorial from https://index.docker.io/v1
Pulling image 8dbd9e392a964056420e5d58ca5cc376ef18e2de93b5cc90e868a1bbc8318c1c (precise) from ubuntu
Pulling image b750fe79269d2ec9a3c593ef05b4332b1d1a02a62b4accb2c21d589ff2f5f2dc (12.10) from ubuntu
Pulling image 27cf784147099545 () from tutorial

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4. Start a container by running a process in it

~$ docker run learn/tutorial echo "Hello World"

Hello World

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5. Install a simple utility ping in the container

~$ docker run learn/tutorial apt-get install -y ping

Reading package lists...
Building dependency tree...
The following NEW packages will be installed:
  iputils-ping
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 56.1 kB of archives.
After this operation, 143 kB of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu/ precise/main iputils-ping amd64 3:20101006-1ubuntu1 [56.1 kB]
debconf: delaying package configuration, since apt-utils is not installed
Fetched 56.1 kB in 1s (50.3 kB/s)
Selecting previously unselected package iputils-ping.
(Reading database ... 7545 files and directories currently installed.)
Unpacking iputils-ping (from .../iputils-ping_3%3a20101006-1ubuntu1_amd64.deb) ...
Setting up iputils-ping (3:20101006-1ubuntu1) ...

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6. Save your changes. First find the id of your container

~$ docker ps -l

ID                  IMAGE               COMMAND                CREATED             STATUS              PORTS
6982a9948422        ubuntu:12.04        apt-get install ping   1 minute ago        Exit 0

Now commit your changes

~$ docker commit -author="Dipesh Bhardwaj" -m="Ping Installed" 6982 learn/ping

effb66b31edb             <--------- This is new image ID

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7. Run your new image, let's ping to google

~$ docker run learn/ping ping www.google.com

PING www.google.com (74.125.239.129) 56(84) bytes of data.
64 bytes from nuq05s02-in-f20.1e100.net (74.125.239.148): icmp_req=1 ttl=55 time=2.23 ms
64 bytes from nuq05s02-in-f20.1e100.net (74.125.239.148): icmp_req=2 ttl=55 time=2.30 ms
64 bytes from nuq05s02-in-f20.1e100.net (74.125.239.148): icmp_req=3 ttl=55 time=2.27 ms
64 bytes from nuq05s02-in-f20.1e100.net (74.125.239.148): icmp_req=4 ttl=55 time=2.30 ms
-> This would normally just keep going, so we quit here.

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8. Get the image ID and status of all runnin containers

~$ docker ps learn/ping

ID                  IMAGE               COMMAND               CREATED             STATUS              PORTS
efefdc74a1d5        learn/ping:latest   ping www.google.com   37 seconds ago      Up 36 seconds

Now inspect youf docker image

~$ docker inspect efef

o/p long enough ........

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9. Now push images to the Docker Hub Registry, first find all available images in system

~$ docker images

ubuntu                latest              8dbd9e392a96        4 months ago        131.5 MB (virtual 131.5 MB)
learn/tutorial        latest              8dbd9e392a96        2 months ago        131.5 MB (virtual 131.5 MB)
learn/ping            latest              effb66b31edb        10 minutes ago      11.57 MB (virtual 143.1 MB)

Now push your image

~$ docker push learn ping

o/p pushed

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                        ##        .
                  ## ## ##       ==
               ## ## ## ##      ===
           /""""""""""""""""\___/ ===
      ~~~ {~~ ~~~~ ~~~ ~~~~ ~~ ~ /  ===- ~~~
           \______ o          __/
             \    \        __/
              \____\______/
 
              |          |
           __ |  __   __ | _  __   _
          /  \| /  \ /   |/  / _\ |
          \__/| \__/ \__ |\_ \__  |