Disk Usage of docker images

[Olaf Flebbe <o....@science-computing.de>]

Hi Roman,

Any help (i.e. pointer to the relevant doc or scripts) on setting up the docker build environment is much appreciated.... I simply had no time to dig through all the infos about ansible/vagrant/docker/puppet/container stuff and build it up for me on my laptop. 
For compile jobs we use vmware ... but I would like to switch to docker sooner than later even. Basic docker know-how available. 

Your concern is that docker images are getting too large.  Let me tell you that for our other products image sizes (Xen) are in 50Gb+ size, I would be very glad to reduce it with docker to several Gb through sharing common filesystem parts, this is a tremendous saving.

My main concern is not disk space, rather RAM usage.  javadoc generation (for instance for pig) is a monster. For instance I had to supply 4 GB of RAM to my vmware machine in order not to slooooowwww down tremendiously for Pig. 
 
Olaf
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