dovecot - Nov 2010 - remote hot site, IMAP replication or cluster over WAN

Taking a survey.

1.  How many of you have a remote site hot backup Dovecot IMAP server?

2.  How are you replicating mailbox data to the hot backup system?
    A.  rsync
    B.  DRBD+GFS2
    C.  Other

Thanks.

-- 
Stan

Hi,

On 2010-11-02 10:30, Stan Hoeppner wrote:
> 1.  How many of you have a remote site hot backup Dovecot IMAP server?
Only local (same room, different box). Copying to a remote location in
irregular intervals.
> 2.  How are you replicating mailbox data to the hot backup system?
>     A.  rsync
>     B.  DRBD+GFS2
>     C.  Other
C. - rdiff-backup (versioned).

Patrick.

-- 
Key ID: 0x86E346D4            http://patrick-nagel.net/key.asc
Fingerprint: 7745 E1BE FA8B FBAD 76AB 2BFC C981 E686 86E3 46D4

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 259 bytes
Desc: OpenPGP digital signature
URL:
<http://dovecot.org/pipermail/dovecot/attachments/20101102/50ee6c24/attachment-0002.bin>

Stan Hoeppner <stan at hardwarefreak.com> wrote:
> Taking a survey.
>
> 1.  How many of you have a remote site hot backup Dovecot IMAP server?
>
> 2.  How are you replicating mailbox data to the hot backup system?
>     A.  rsync
>     B.  DRBD+GFS2
>     C.  Other
Do you need IMAP or POP3 would be sufficient?
IMHO POP3 offers interesting options beyond what you have mentioned.

-- 
[pl>en: Andrew] Andrzej Adam Filip : anfi at onet.eu
Be cheerful while you are alive.
  -- Phathotep, 24th Century B.C.

Am 02.11.2010 03:30, schrieb Stan Hoeppner:
> Taking a survey.
> 
> 1.  How many of you have a remote site hot backup Dovecot IMAP server?
> 
> 2.  How are you replicating mailbox data to the hot backup system?
>     A.  rsync
>     B.  DRBD+GFS2
>     C.  Other
A bit off-topic, sorry ... I want to set up a hot backup dovecot in a
VM, aside the physical server, so I am very interested in the "best
practise" to do so ...

Stefan

Andrzej Adam Filip put forth on 11/2/2010 4:36 AM:
> Stan Hoeppner <stan at hardwarefreak.com> wrote:
>> Taking a survey.
>>
>> 1.  How many of you have a remote site hot backup Dovecot IMAP server?
>>
>> 2.  How are you replicating mailbox data to the hot backup system?
>>     A.  rsync
>>     B.  DRBD+GFS2
>>     C.  Other
> 
> Do you need IMAP or POP3 would be sufficient?
> IMHO POP3 offers interesting options beyond what you have mentioned.
IMAP.

-- 
Stan

Stan,

On 11/1/10 7:30 PM, "Stan Hoeppner" <stan at hardwarefreak.com>
wrote:
> 1.  How many of you have a remote site hot backup Dovecot IMAP server?
+1
 
> 2.  How are you replicating mailbox data to the hot backup system?
>     C.  Other
Netapp Fabric MetroCluster, active IMAP/POP3 nodes at both sites mounting
storage over NFS, and active/standby hardware load balancers in front.

Probably more than most folks can afford, but it's pretty bulletproof.

-Brad

Am 03.11.2010 03:09, schrieb Stan Hoeppner:
> Andrzej Adam Filip put forth on 11/2/2010 4:36 AM:
>> Stan Hoeppner <stan at hardwarefreak.com> wrote:
>>> Taking a survey.
>>>
>>> 1.  How many of you have a remote site hot backup Dovecot IMAP
server?
>>>
>>> 2.  How are you replicating mailbox data to the hot backup system?
>>>     A.  rsync
>>>     B.  DRBD+GFS2
>>>     C.  Other
>>
>> Do you need IMAP or POP3 would be sufficient?
>> IMHO POP3 offers interesting options beyond what you have mentioned.
> 
> IMAP.
> 
we have rsync as backup
and store on drbd with ocfs2

imapsync would work too, testet

-- 
Best Regards

MfG Robert Schetterer

Germany/Munich/Bavaria

Op 3-11-2010 12:16, Stan Hoeppner schreef:
> Johan Hendriks put forth on 11/3/2010 3:32 AM:
>
>> Hello, i am working primarly with FreeBSD, and the latest release has a
>> service called HAST.
>> See it as a mirrored disk over the network.
>> You can install both machines with dovecot, and use the hast disk as
the
>> data storage.
>> With CARP in the mix, when the master machine fails, it starts dovecot
>> on the slave.
>> This way you have a failover without user interference.
> 1.  How do you automatically redirect clients to the IP address of the
> slave when the master goes down?  Is this seamless?  What is the
> duration of "server down" seen by clients?  Seconds, minutes?
>
> 2.  When you bring the master back up after repairing the cause of the
> failure, does it automatically and correctly resume mirroring of the
> HAST device so it obtains the new emails that were saved to the slave
> while it was offline?  How do you then put the master back into service
> and make the slave offline again?
>
The servers work with an virtual ip.
Carp does this, i use it for the firewalls on our location.
Server 1 has ip adres 192.168.1.1, server 2 gets 192.168.1.2, and the 
virtual addres is 192.168.1.3
The clients connect to the virtual address 192.168.1.3, and contact the 
machine wich is master at that moment.

I do not know how the rebuild goes with hast, if the master provider 
goes down, like i said, i need to try and test it.
Maybe an question on the freebsd-fs mailing list will answer this.

More about HAST http://wiki.freebsd.org/HAST
More about Carp http://www.freebsd.org/doc/nl/books/handbook/carp.html

regards,
Johan Hendriks

Johan Hendriks wrote:
> The servers work with an virtual ip.
> Carp does this, i use it for the firewalls on our location.
> Server 1 has ip adres 192.168.1.1, server 2 gets 192.168.1.2, and the
> virtual addres is 192.168.1.3
> The clients connect to the virtual address 192.168.1.3, and contact
> the machine wich is master at that moment.
Yes, this is a normal Linux-HA setup. 


/Per Jessen, Z?rich