Re: Fedora S3 Backed AMIs
On 2011-07-28 8:36, Tim Flink wrote:
As I'm learning more about EC2 and AMIs, I'm wondering what
the plans
are for Fedora S3 backed AMIs.
If I'm understanding correctly, an S3 backed AMI has no persistent
storage - once the instance is rebooted, all changes are effectively
reverted. This would mean that applying updates to an S3 backed AMI
would be a questionable process and any updates requiring a reboot
would be impossible.
Instance storage of this sort does not go away when instances are merely
rebooted. It is only destroyed at instance termination time.
Are we planning to release S3 AMIs on a regular basis or are we
expecting users to use the S3 AMIs to build their own images and take
on the responsibility of updating those images on their own? Or are we
focusing on the EBS backed AMIs that do have persistent storage?
Creating Fedora respins midway through a release consumes time and
resources that, given our difficulty with the F15 images alone, we
appear to lack.
Building updates into images also calls GPL compliance into question, as
updates that are superseded by newer updates get removed from mirrors
and eventually garbage-collected by koji. This is not the case for
packages in the release repository, which stick around forever, or the
Fedora Unity respins, which provide source media alongside the binary media.
I wouldn't be too concerned about supplying people with updated cloud
images; they are really only a baseline that people can respin for
themselves and others as they wish. People who wish to use EC2 merely
as a pay-per-hour VPS provider can use either type of instance and keep
it up to date via the usual channels like they are used to doing
elsewhere. People who are running cloud applications have designed
their applications such that individual instances are unimportant and
replaceable. In those cases it is frequently easier to simply terminate
out-of-date instances and replace them with new instances from fresh
system images that cloud application writers already create as their
applications evolve.