The B-RAS could use virtualizing (mostly), one official thinks.
The following blog post describes a debugging adventure on Cloudflare's Mesos-based cluster. This internal cluster is primarily used to process log file information so that Cloudflare customers have analytics, and for our systems that detect and respond to attacks.
The problem encountered didn't have any effect on our customers, but did have engineers scratching their heads...
At some point in one of our cluster we started seeing errors like this (an NXDOMAIN for an existing domain on our internal DNS):
lookup some.existing.internal.host on 10.36.0.9:53: no such host
This seemed very weird, since the domain did indeed exist. It was one of our internal domains! Engineers had mentioned that they'd seen this behaviour, so we decided to investigate deeper. Queries triggering this error were varied and ranged from dynamic SRV records managed by mesos-dns to external domains looked up from inside the cluster.
Our first naive attempt was to run the following in a loop:
while true; do dig some.existing.internal.host > /tmp/dig.txt || break; done
Running this for a while on one server did not reproduce the problem: all the lookups were successful. Then we took our service Continue reading
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