[Bug 615545] Re: Instances launched in a VPC cannot access ec2.archive.ubuntu.com

[Clint Byrum]

Excerpts from cloudcontrol's message of Thu Jan 12 23:27:07 UTC 2012:
> Hi Folks,
> 
> To whoever manages DNS for this repository: a more elegant solution not
> requiring an package patches would have been to follow this practice for
> DNS on EC2.
> 
> Try to use CNAMES to the fully-qualified domain name EC2 instead of A
> records. For example, at the moment you are using:
> 
> us-west-1.ec2.archive.ubuntu.com.  600 IN A     10.162.150.127
> 
> This address is apparently not routable from the outside world (perhaps
> to avoid bandwidth charges?)
> 
> Had you used a routable EC2 Elastic IP, and a CNAME record pointing to
> the EC2 assigned FQDN, lookup requests by VPC servers would have the
> public elastic IP returned like this:
> 
> ;; ANSWER SECTION:
> us-west-1.ec2.archive.ubuntu.com.    600    IN    CNAME    ec2-108-20-220-125.compute-1.amazonaws.com.
> ec2-108-20-220-125.compute-1.amazonaws.com. 300     IN      A     108.20.220.125
> 
> Lookup requests by VPC servers would have the public elastic IP
> returned, while instances launched normally in EC2 would receive the
> private  address:
> 
> ;; ANSWER SECTION:
> us-west-1.ec2.archive.ubuntu.com.    600    IN    CNAME    ec2-108-20-220-125.compute-1.amazonaws.com.
> ec2-108-20-220-125.compute-1.amazonaws.com. 300     IN     A      10.252.111.96
> 
> I've made these addresses up, of course, and I understand you have
> multiple servers for each hostname,  but we use this method with
> weighted round robin DNS on EC2 as well and it works as in the example
> above.

Interesting, I didn't know that Amazon's servers worked this way, responding
with the internal IP.

I believe the EC2 mirrors are currently being migrated to S3:

http://cloud.ubuntu.com/2012/01/regional-s3-backed-ec2-mirrors-
available-for-testing/

I am not sure how this will affect VPC instances.

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https://bugs.launchpad.net/bugs/615545

Title:
  Instances launched in a VPC cannot access ec2.archive.ubuntu.com

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