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From Daniel Mezentsev <...@soleks.com>
Subject Re: Advice needed - switching IP for SS
Date Thu, 04 Feb 2016 08:17:35 GMT
  Igor,

I have question. Doing such IP migration is it possible that arp cache on
the switch (assuming that we have layer 3 switch) can have old server pair
MAC<--->IP.

> Andrija, as for me the best solution:
>
> 1. shutdown data interfaces (or bond) on switch for new server after
rsync
> 2. Configure same IP as for old server
> 3. via switch CLI shutdown data ports for old server
> 4. via switch CLI startup ports for new server
> 4. Reconfigure IP for data bond old server via mgm interface to new IP
> 5. via switch CLI startup data ports for old server on switch
>
> All this can be done via ansible. Downtime will be only between steps 3
> and
> 4. And it's will be around 0,1-0,5 seconds.
>
> From cloudstack mgmt sever it's will be transparent. Possible 1-2 TCP
> retransit will happen.
>
> 2016-02-03 22:49 GMT+02:00 Andrija Panic <andrija.panic@gmail.com>:
>
>> Hi guys,
>>
>> I need to do manitance of 1 Seconary Storage NFS server fro few days,
>> so I
>> though to temporarily rsync data to another NFS box, and switch IP
>> addresses, so the new NFS box has the original IP for few days...(need
to
>> test if KVm nodes will gracefullt remount the NFS server during the IP
>> switchover...)
>>
>> Is this the prefered way, or should I hack the DB to point existing NFS
>> server (that is defined in ACS) to the new IP of the second NFS box, and
>> perhaps restart mgmt and agents across all nodes.
>>
>> Any recomendations ?
>>
>> Best,
>>
>> Andrija Panić
>
>  
  Daniel Mezentsev, founder
(+1) 604 313 8592.
Soleks Data Group.
Shaping the clouds.

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