[prev in list] [next in list] [prev in thread] [next in thread] 

List:       wikipedia-l
Subject:    Re: [Wikipedia-l] Fwd: [Wikitech-l] eqiad->codfw datacenter switchover, weeks of Apr 17th/May 1st
From:       zppix e <megadev44s.mail () gmail ! com>
Date:       2017-04-09 16:02:11
Message-ID: A09F9729-DDE1-47CF-A972-C22724AF9BF9 () gmail ! com
[Download RAW message or body]

No problem if anyone has any question feel free to email me, or ask in #wikimedia-tech on irc.freenode.net ( webchat.freenode.net ) 
-
Zppix
Volunteer Developer
ENWIKI rollbacker & NPR 
ENWP.org/user:Zppix

Sent from my iPhone

> On Apr 8, 2017, at 11:29 PM, Gerard Meijssen <gerard.meijssen@gmail.com> wrote:
> 
> Hoi,
> It is great news to understand the level of our ability to switch over. I
> am impressed and yes, it can and will improve but this is good to hear and
> understand.
> Thanks,
>     GerardM
> 
>> On 9 April 2017 at 03:39, zppix e <megadev44s.mail@gmail.com> wrote:
>> 
>> 
>> 
>> 
>>> From: Faidon Liambotis <faidon@wikimedia.org>
>>> Date: April 7, 2017 at 8:58:09 AM CDT
>>> To: Wikimedia developers <wikitech-l@lists.wikimedia.org>
>>> Subject: [Wikitech-l] eqiad->codfw datacenter switchover, weeks of Apr
>> 17th/May 1st
>>> Reply-To: Wikimedia developers <wikitech-l@lists.wikimedia.org>
>>> 
>>> Hi all,
>>> 
>>> You may have heard already that, like last year, we are planning to
>>> switch our active datacenter from eqiad to codfw in the week of April
>>> 17th and back to eqiad two weeks later, on the week of May 1st. We do
>>> this periodically in order to exercise our ability to run from the
>>> backup site in case of a disaster, as well as our ability to switch
>>> seamlessly to it with little user impact.
>>> 
>>> Switching will be a gradual, multi-step process, the most visible step
>>> of which will be the switch of MediaWiki application servers and
>>> associated data stores. This will happen on April 19th (eqiad->codfw)
>>> and May 3rd (codfw->eqiad), both at 14:00 UTC. During those windows, the
>>> sites will be placed into read-only mode, for a period that we estimate
>>> to last approximately 20 to 30 minutes.
>>> 
>>> Furthermore, the deployment train will freeze for the weeks of April
>>> 17th and May 1st[1], but operate normally on the week of April 24th, in
>>> order to exercise our ability to deploy code while operating from the
>>> backup datacenter.
>>> 
>>> 1: https://wikitech.wikimedia.org/wiki/Deployments
>>> 
>>> Compared to last year we have improved our processes considerably[2], in
>>> particular by making more services operate in an active/active manner,
>>> as well as by working on an automation and orchestration framework[3] to
>>> perform parallel executions across the fleet. The core of the MediaWiki
>>> switchover will be performed semi-automatically using a new software[4]
>>> that will execute all the necessary commands in sequence with little
>>> human involvement, and thus lowering the risk of introducing errors and
>>> delays.
>>> 
>>> 2: https://wikitech.wikimedia.org/wiki/Switch_Datacenter
>>> 3: https://github.com/wikimedia/cumin
>>> 4: https://github.com/wikimedia/operations-switchdc
>>> 
>>> Improving and automating our processes means that we're not going to be
>>> following the exact same steps as last year. Because of that, and
>>> because of other changes introduced in our environment over the course
>>> of the year, there is a possibility of errors creeping into the process.
>>> We'll certainly try to fix any issues that arise during those weeks and
>>> we'd like to ask everyone to be on high-alert and vigilant.
>>> 
>>> To report any issues, please use one of the following channels:
>>> 
>>> 1. File a Phabricator issue with project #codfw-rollout
>>> 2. Report issues on IRC: Freenode channel #wikimedia-tech (if urgent, or
>>> during the migration)
>>> 3. Send an e-mail to the Operations list: ops@lists.wikimedia.org (any
>> time)
>>> 
>>> Thanks,
>>> Faidon
>>> --
>>> Faidon Liambotis
>>> Principal Operations Engineer
>>> Acting Director of Technical Operations
>>> Wikimedia Foundation
>>> 
>>> _______________________________________________
>>> Wikitech-l mailing list
>>> Wikitech-l@lists.wikimedia.org
>>> https://lists.wikimedia.org/mailman/listinfo/wikitech-l
>> _______________________________________________
>> Wikipedia-l mailing list
>> Wikipedia-l@lists.wikimedia.org
>> https://lists.wikimedia.org/mailman/listinfo/wikipedia-l
>> 
> _______________________________________________
> Wikipedia-l mailing list
> Wikipedia-l@lists.wikimedia.org
> https://lists.wikimedia.org/mailman/listinfo/wikipedia-l

_______________________________________________
Wikipedia-l mailing list
Wikipedia-l@lists.wikimedia.org
https://lists.wikimedia.org/mailman/listinfo/wikipedia-l

[prev in list] [next in list] [prev in thread] [next in thread]