[Bug 745930] Re: cloud-init timeout waiting for metadata service on EC2

[Eric Hammond]

In my experience in 2008-2009, just because networking is up on an EC2
instance does not mean that 169.254.169.254 is going to accept
connections and requests for meta-data and user-data.  You need to wait
for this to become available.  I had code to do this in Ubuntu AMIs I
built back then.

    perl -MIO::Socket::INET -e 'until(new
IO::Socket::INET("169.254.169.254:80")){sleep 1}'

I used to think I was waiting for networking to come up, but it became
clear that the meta-data service was not listening even some times when
networking was working and I had a local IP address on the instance.

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https://bugs.launchpad.net/bugs/745930

Title:
  cloud-init timeout waiting for metadata service on EC2