Mailing-List: contact dev-help@cloudstack.apache.org; run by ezmlm
Precedence: bulk
Reply-To: dev@cloudstack.apache.org
Date: Thu, 04 Feb 2016 00:17:35 -0800
Message-ID: <20160204001735.Horde.kShTzJfx2KARoTvb8keofdM@webmail.soleks.net>
From: Daniel Mezentsev <dan@soleks.com>
To: dev@cloudstack.apache.org
Subject: Re: Advice needed - switching IP for SS
References: 
 <CAMvtBPPxLqbqe=oAn5gVxxKGGmB2zfKQ7GypVor1zy_-KiEp+g@mail.gmail.com>
 <CAGNTHwbYHnvL_XmkLHeniUakLvNitK3fhK=4EmxwPOx+z0AcrQ@mail.gmail.com>
In-Reply-To: 
 <CAGNTHwbYHnvL_XmkLHeniUakLvNitK3fhK=4EmxwPOx+z0AcrQ@mail.gmail.com>
User-Agent: Horde Application Framework 5
Content-Type: multipart/alternative; boundary="=_2AcsgPRvXOcZXkJaAJxr3Hj"
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

--=_2AcsgPRvXOcZXkJaAJxr3Hj
Content-Type: text/plain; charset=utf-8; format=flowed; DelSp=Yes
Content-Description: Plaintext Message
Content-Disposition: inline
Content-Transfer-Encoding: 8bit

  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.

--=_2AcsgPRvXOcZXkJaAJxr3Hj--