YOKOFAKUN: July 2015

13 July 2015

Playing with #Docker , my notebook

This post is my notebook about docker after we had a very nice introduction about docker by François Moreews (INRIA/IRISA, Rennes). I've used docker today for the first time, my aim was just to create an image containing https://github.com/lindenb/verticalize, a small tool I wrote to verticalize text files.

Install docker

you hate running this kind of command-lines, aren't you ?

$ wget -qO- https://get.docker.com/ | sh
sudo password for tatayoyo:
apparmor is enabled in the kernel and apparmor utils were already installed
/sbin/apparmor_parser
+ [ https://get.docker.com/ = https://get.docker.com/ ]
+ sudo -E sh -c apt-key adv --keyserver
(...)

add my linux account to the "docker" group

sudo usermod -aG docker tatayoyo

logout and relog...

I'm working behind a $@!# proxy: edit /etc/default/docker to set the proxy-things

$ cat /etc/default/docker
(...)
# If you need Docker to use an HTTP proxy, it can also be specified
here.
export http_proxy="http://(proxy-port):(proxy-host)/"
export https_proxy="http://(proxy-port):(proxy-host)/"
export ftp_proxy="http://(proxy-port):(proxy-host)/"
export HTTP_PROXY="http://(proxy-port):(proxy-host)/"
export FTP_PROXY="http://(proxy-port):(proxy-host)/"
export HTTPS_PROXY="http://(proxy-port):(proxy-host)/"
(...)

start the docker service

$ sudo start docker
[sudo] password for tatayoyo:
docker start/running, process 5023

create the Dockerfile

Create a new directory, in this directory we create a file named "Dockerfile". It contains

the name of the base-image we're using (here the latest ubuntu)
the $@!# proxy settings (again ???!!!!)
some calls to `apt` to download git, gcc, make ...
some statements to clone https://github.com/lindenb/verticalize, compile and install my tool into /usr/local/bin

FROM ubuntu:latest
ENV http_proxy "http://(proxy-port):(proxy-host)/"
ENV https_proxy "http://(proxy-port):(proxy-host)/"
ENV ftp_proxy "http://(proxy-port):(proxy-host)/"
ENV HTTP_PROXY "http://(proxy-port):(proxy-host)/"
ENV HTTPS_PROXY "http://(proxy-port):(proxy-host)/"
ENV FTP_PROXY "http://(proxy-port):(proxy-host)/"
RUN apt-get update
RUN apt-get install -y wget gcc make git
RUN git clone "https://github.com/lindenb/verticalize.git" /tmp/verticalize && make -C /tmp/verticalize && cp /tmp/verticalize/verticalize /usr/local/bin && rm -rf /tmp/verticalize

create the image 'verticalize' from the Dockerfile

sudo docker build -t verticalize .
(...)

List the images

$ docker images
REPOSITORY  TAG                 IMAGE ID         CREATED        VIRTUAL SIZE
verticalize latest              5f7159b4921a     12 seconds ago 317 MB
(...)

Tag the 'verticalize' image as hosted on my dockerhub repo https://registry.hub.docker.com/u/lindenb

$ docker tag 5f7159b4921a lindenb/verticalize:latest

$ docker images
REPOSITORY            TAG                 IMAGE ID            CREATED              VIRTUAL SIZE
verticalize           latest              5f7159b4921a        About a minute ago   317 MB
lindenb/verticalize   latest              5f7159b4921a        About a minute ago   317 MB

Push the image to dockerhub

$ docker push lindenb/verticalize

The push refers to a repository [lindenb/verticalize] (len: 1)
5f7159b4921a: Image push failed

Please login prior to push:
Username: lindenb
Password:
Email: xxxxxxx@yahoo.fr
WARNING: login credentials saved in /home/tatyoyo/.docker/config.json
Login Succeeded
The push refers to a repository [lindenb/verticalize] (len: 1)
5f7159b4921a: Image already exists
68f6ddc7de15: Buffering to Disk

We can now remove the local image ...

$ docker rmi -f  5f7159b4921a

.. and pull the image from dockerhub

$ docker pull lindenb/verticalize
latest: Pulling from lindenb/verticalize
83e4dde6b9cf: Downloading [==================> ] 24.82 MB/65.79 MB
b670fb0c7ecd: Download complete
29460ac93442: Download complete
d2a0ecffe6fa: Download complete
48e98a1c03ae: Download complete
94ac1beb0514: Download complete
e12eda8693a9: Download complete
5eb1952afbb7: Download complete
fb4ac6e6a264: Download complete
0f8372bacf03: Download complete
789c4f122778: Downloading [=================>  ] 7.511 MB/20.92 MB
68f6ddc7de15: Downloading [=====>              ]  4.99 MB/44.61 MB
5f7159b4921a: Download complete

At the end, run a command inside the docker container

My tool verticalize is installed in the image 'lindenb/verticalize:latest' :

$ cat << EOF |  docker run -i lindenb/verticalize:latest
> echo -e "#X\tY\n1\t2\n3\t4" | verticalize
> EOF

>>> 2
$1 #X 1
$2 Y 2
<<< 2

>>> 3
$1 #X 3
$2 Y 4
<<< 3

That's it,
Pierre

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