[OpenAFS] Re: Re: afs db failover testing for lowest IP

[John Sopko]

Were all friends, good to let the group know some of our issues! In my
case I built openafs 1.6.22.1 For Redhat 6.9 since there are no
binaries. When I updated it nuked the /usr/vice/etc/CellServDB.local
on my working cell so the clients did not know about about the
secondary servers anymore. We use dns afsdb records for our
productions cell so this is not an issue, just my test cell. I am
doing testing to move to Redhat 7.4. I will ping you about all this,
thanks for the info.

On Wed, Jan 24, 2018 at 5:38 PM, Stephen Joyce <stephen@email.unc.edu> wrote:
> That was intended to be addressed only to John. Mea culpa.
>
>
> On Wed, 24 Jan 2018, Stephen Joyce wrote:
>
>> Hey, John.
>>
>> Let me know if you have more problems, or just need to bounce any ideas
>> around.
>>
>> I went through something similar last summer, but I actually changed IP
>> addresses (moved to a different VLAN). I decided to bite the bullet and
>> virtualize my DB servers at the same time. You may want to consider the
>> same. It has the potential to make some future tasks much simpler (esp.
>> disaster recovery).
>>
>> I think I ended up having 3 short downtimes (announced 1 hour; finished in
>> 15 mins each time) scheduled during semester breaks.
>>
>> For safety, I've currently got all 3 DB servers are on separate dedicated,
>> low-power hypervisors in the same cluster (Dell R410s), so I'm not really
>> eliminating physical boxes per-se, but it gives me flexibility to snap the
>> VMs, reboot *fast*, live migrate the VMs between HVs for patching,
>> hardware
>> upgrades, etc...
>>
>> Stephen
>>
>> On Wed, 24 Jan 2018, John Sopko wrote:
>>
>>> I did not have the secondary db machines in /usr/vice/etc/CellServDB.
>>> All is good :)
>>>
>>> On Wed, Jan 24, 2018 at 9:57 AM, John Sopko <sopko@cs.unc.edu> wrote:
>>>>
>>>> I need to upgrade our afs db servers. It has been sometime so I setup
>>>> a test cell with 3 servers to see how things react when the lowest IP
>>>> server is down.
>>>>
>>>> When the lowest IP db server is down udebug shows the second lowest IP
>>>> becomes the sync site. But, I cannot do certain commands that time out
>>>> because they are trying to use the lowest IP address that id down. For
>>>> example I cannot do "pts listentries -users" "vos listvldb". The file
>>>> services seem to be ok.
>>>>
>>>> I use "strace pts listentires -users" which shows the client keeps
>>>> trying the down machines IP until it finally times out. Can anyone
>>>> shed any light on what is going on. Thanks.
>>>>
>>>>
>>>> --
>>>> John W. Sopko Jr.
>>>> University of North Carolina
>>>> Computer Science Dept CB 3175
>>>> Chapel Hill, NC 27599-3175
>>>>
>>>> Fred Brooks Building; Room 140
>>>> Computer Services Systems Specialist
>>>> email: sopko AT cs.unc.edu
>>>> phone: 919-590-6144
>>>
>>>
>>>
>>>
>>> --
>>> John W. Sopko Jr.
>>> University of North Carolina
>>> Computer Science Dept CB 3175
>>> Chapel Hill, NC 27599-3175
>>>
>>> Fred Brooks Building; Room 140
>>> Computer Services Systems Specialist
>>> email: sopko AT cs.unc.edu
>>> phone: 919-590-6144
>>> _______________________________________________
>>> OpenAFS-info mailing list
>>> OpenAFS-info@openafs.org
>>> https://lists.openafs.org/mailman/listinfo/openafs-info
>>>
>>
>> --
>> Stephen Joyce
>> Linux Systems Specialist
>> Office of Arts & Sciences Information Services
>> University of North Carolina at Chapel Hill
>> _______________________________________________
>> OpenAFS-info mailing list
>> OpenAFS-info@openafs.org
>> https://lists.openafs.org/mailman/listinfo/openafs-info
>>
>
> Sincerely,
> Stephen
> --
> Stephen Joyce
> Linux Systems Specialist
> Office of Arts & Sciences Information Services
> University of North Carolina at Chapel Hill
>
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>
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-- 
John W. Sopko Jr.
University of North Carolina
Computer Science Dept CB 3175
Chapel Hill, NC 27599-3175

Fred Brooks Building; Room 140
Computer Services Systems Specialist
email: sopko AT cs.unc.edu
phone: 919-590-6144