Thar She Blows!

New Docker build puts the emphasis on quality

Lucy Carey
docker.1

Version 0.8 comes complete with ADD caching feature, BTRFS storage driver, and official support for Mac OSX, among other updates.

Container engine Docker is on a bit of a roll – flush
from a recent $15 million cash injection, it’s now pushed out a
much-improved
0.8 version
.

Docker is very much a rising star in the tech
landscape. With the general movement towards highly scalable
architectures and an
app-orientated
culture, the  lightweight open-source
technology is perfectly poised to capitalise on demand from devs to
looking for a speedy way to port their code into the cloud.

First launched in March 2013, uptake is rapidly
increasing – in fact, it’s one of the fastest growing open source
projects out there, and is the most widely utilised Linux container
on the market.

Within the latest build there are three big changes.
New builder instructions now allow for ADD caching, and there are
now ONBUILD triggers for deferred statement execution. Any build
instruction can be now registered as a trigger. There’s also a new
BTRFS storage driver. Highly popular among the Linux community,
BTRFS is often seen as an alternative to the ZFS filesystem. This
is an experimental feature for now, and comes disabled as
default.

Finally, there’s now official support for Mac OSX,
meaning Docker container build can be carried out directly on Mac
computers using Linux applications.

However, the real headliner in Docker 0.8 is quality,
writes Solomon
Hykes
on the Docker blog. This time around, the team has
prioritised cleanup, polishing and bug-fixing above the addition of
new features – greatly enhancing stability and performance within
the new release.

Docker 0.8 also marks the start of a new release “cadence”: From
now on, a new version of the program will appear on the first week
of every month, meaning that releases are no longer determined on
the basis of new features. Release dates are not linked to any
specific features – finished new additions will go out on the
following monthly release as soon as they are merged into
Docker.

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