Re: [atomic-devel] Reducing the footprint of the Fedora docker base image

[Daniel J Walsh <dwalsh redhat com>]

On 02/10/2016 05:13 PM, Josh Berkus wrote:
> On 02/10/2016 11:38 AM, Courtney Pacheco wrote:
>> If possible, I'd like some feedback on the work I did. Comments and
>> criticism are more than welcomed! I realize there may be some
>> controversy in terms of what I chose to remove and what I chose to turn
>> into weak dependencies, but I would like to hear your thoughts either
>> way.
>>
>
> First, thanks for doing this!  It really shows a lot.  I'd be really
> curious as to what's in the remaining 144MB, given that Alpine and
> BusyBox can get away with a userspace which is 25% of that size.
>
Well busybox supplies almost all of the executables in coreutils,
shadow-utils  and a few other packages, as links to the same executable,
right there you are going to see a lot of savings. 

The next step to shrinking would be to look for a few FAT apps,

Run
du -am | sort -n
And see what big files are in the container image, can we eliminate any?
Shrink any?

> As Dan points out, we can't necessarily dispose of DNF/Yum during the
> standard container build (i.e. Dockerfile).  However ... could we
> remove them afterwards?
>
> I'm also wondering if tzdata will be a problem.  Some applications,
> like webservers and database servers, do need the tzdata files, but I
> suspect don't have it marked as a dependency since they're assumed to
> "just be there".   Would be nice to remove them when not needed, though.
>