[Labs-l] second attempt to request alternative login server

[Petr Bena]

YAY. it would be cool if some of them would be mirroring keys from
gluster so that it works even when gluster is down :>

On Sun, Mar 3, 2013 at 8:43 PM, Ryan Lane <rlane at wikimedia.org> wrote:
> On Sun, Mar 3, 2013 at 7:51 AM, Petr Bena <benapetr at gmail.com> wrote:
>>
>> HI,
>>
>> today it's second time that bastion was inaccessible:
>>
>> If you are having access problems, please see:
>>
>> https://wikitech.wikimedia.org/wiki/Access#Accessing_public_and_private_instances
>> debug1: Authentications that can continue: publickey
>> debug1: Next authentication method: publickey
>> debug1: Offering RSA public key: /home/petanb/.ssh/id_rsa
>> debug2: we sent a publickey packet, wait for reply
>>
>>
>> if we can't have a different way to authenticate than using public
>> keys WHICH ARE broken often - can we have at least second stable login
>> server.
>>
>> BTW I assume that logins didn't work because of gluster so that it
>> wouldn't work anyway, but if gluster suck so hard, can we at least
>> have password auth until you fix it? Bad authentication is better than
>> no working authentication
>>
>
> Though I'm usually more than happy to blame gluster, this was not caused by
> gluster. It was because someone OOM'd the instance.
>
> We've actually finally stablized gluster to a point where we shouldn't be
> having complete outages any more:
>
> https://ganglia.wikimedia.org/latest/?r=month&cs=&ce=&m=cpu_report&s=by+name&c=Glusterfs+cluster+pmtpa&h=&host_regex=&max_graphs=0&tab=m&vn=&sh=1&z=small&hc=4
>
> Note in the above graph that the past week and a half the memory usage has
> been mostly flat. There was one spot where the memory ballooned, then a spot
> where it dropped. That last memory balloon was before the changes we put in
> place and the drop was where I restarted the glusterd processes (which
> doesn't affect filesystem access).
>
> There are some split brain issues still around from the most recent round of
> instability, but the SSH keys are perfectly fine. I will not enable password
> authentication. It's incredibly insecure.
>
> So, to get a little more back on point, I've just created
> bastion2.wmflabs.org and bastion3.wmflabs.org, in case the bastion instances
> OOM again.
>
> - Ryan
>
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