Package: snapshot.debian.org Severity: important Mozilla uses snapshot.debian.org as a way to generate deterministic docker images for its CI. Those docker images are built from Amazon EC2 instance, and we've had recurring intermittent errors connecting to snapshot.debian.org. After having been able to observe the problem first hand (as in, with shell access), I've determined some interesting information:
- While I originally was assuming that snapshot.debian.org was just down at the time we were getting the errors, it turns out it *is* available from other places of the internet (like other EC2 instances or my own machine at home). - When that happens, *both* snapshot.debian.org IPv4 addresses are unreachable (193.62.202.27 and 185.17.185.185). - Traceroute stops at the last router before those hosts. That is, the first "* * *" hop is where, on a machine where it's reachable, snapshot.debian.org would appear. - Looking back at the logs from all the jobs we've had in the past failing to reach snapshot.debian.org (or at least, marked as such), the IP addresses of the hosts they were running on (as well as the IP address of the host I had direct access to and that couldn't connect to snapshot.debian.org) were all in the 18.128.0.0/9 block[1]. Mike 1. Full list: 18.144.32.96 18.144.63.37 18.206.136.206 18.207.181.113 18.212.146.108 18.212.202.120 18.212.204.30 18.212.240.147 18.232.99.231 18.236.139.10 18.236.215.218