On 4/17/2018 2:54 PM, Lukas Tribus wrote:
>> Originally, the "hollywood" entry on the be-cdn-9000 backend (which you can
>> see at the config I linked above) had the backup keyword.  But what I
>> noticed happening was that when planet went down, it took about ten
>> additional seconds (no precise timing was done) for hollywood to go active,
>> and during that time, the client got "no server available" messages.
> 
> You said this is about a 502 error. But "no server available" is not a
> error that haproxy emits and 503 would be "Service Unavailable".
> I don't see any issue replaying this here locally with haproxy 1.5.12.

I have figured out how to resolve the difficulty I was encountering on
this thread, and I can now do service restarts with zero loss.  The
disable-on-404 config, combined with a change to the way the init script
does the restart, has fixed it.

I switched gears and that part about the 'backup' keyword is for a
different problem.  One I already emailed the list separately on and
haven't gotten a response.  Feel free to drop this thread and move to
the other one.  Here is the message on the list archive:

https://www.mail-archive.com/[email protected]/msg29615.html

I apologize for any confusion.  The "no server available" is something I
saw in the output from curl when the primary server went down and the
backup had not yet been changed to Active.

I don't have a transcript of that ssh session, and right now I can't
take the steps to reproduce the error -- the servers are being used
heavily for something that can't be postponed, and reproducing the error
would cause some of those requests to fail.

Thanks,
Shawn

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