Re: designing a backup mail server
On Jun 24, 2005, at 2:09 AM, Shaun Feeley wrote:Hi Guys,I'm not sure if I'm at the right place so sorry if this is annoyingbut...I run a cyrus mail server here at Cytopia supporting about 35 users. Ihave recently purchased some new boxes to upgrade the servers. I amupgrading the Cyrus server, but I am also keen to run a mirror backupcyrus server. Now my question is, can anyone give me any pointers onhow to go about designing a backup mail server.I would suggest using the 2.3 replication mechanism. I've been using it for 6-7 weeks in production with about 100 users.The basic idea is that a program(sync_client) runs on your main cyrus server and pushes any changes to the backup.I have configured one box as I want, then mirrored in onto another. ButI am confused about the DNS setup .. should I create an alias ie mailthat can point to either?? We run our setup in a murder, so we just update the mailbox list on the frontends to point to the backup server in case of a failure.And secondly I am keen to somehow have the mail server polled and if itstops responding bring the backup server into play. To keep themsyncronised I am planning to use rsync... but then how do I keep thesasl backend in sync, with different realms etc?Our failover step is manual. We think failures will be rare, and don't want to be concerned with an automatic mechanism mistakenly making the backup server active.-Patrick
designing a backup mail server
Hi Guys, I'm not sure if I'm at the right place so sorry if this is annoying but... I run a cyrus mail server here at Cytopia supporting about 35 users. I have recently purchased some new boxes to upgrade the servers. I am upgrading the Cyrus server, but I am also keen to run a mirror backup cyrus server. Now my question is, can anyone give me any pointers on how to go about designing a backup mail server. I have configured one box as I want, then mirrored in onto another. But I am confused about the DNS setup .. should I create an alias ie mail that can point to either?? And secondly I am keen to somehow have the mail server polled and if it stops responding bring the backup server into play. To keep them syncronised I am planning to use rsync... but then how do I keep the sasl backend in sync, with different realms etc? Anyway as you might have gathered I am by no means on top of the problem so any ideas will be greatly appreciated. Thanks Shaun -- Shaun Feeley Systems Administrator CYTOPIA RESEARCH PTY LTD A.C.N. 082 492 680 Level 5, Baker Heart Research Institute Building Commercial Road Melbourne Victoria 3004 Australia Tel: +61 3 9522 6900 Fax: +61 3 9510 9292 Email: [EMAIL PROTECTED] Website: www.cytopia.com.au The information contained in this e-mail is confidential and is intended only for the use of the addressee (s). If you receive this e-mail in error, please notify the sender by return e-mail immediately and erase all copies of the message and attachments. --- Cyrus Home Page: http://asg.web.cmu.edu/cyrus Cyrus Wiki/FAQ: http://cyruswiki.andrew.cmu.edu List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
Re: backup mail server
I am in the process of testing out this same setup at present under Linux and I have a couple of questions. 1) How large is your Cyrus installation (# of accounts, # of simultaneous 286 Accounts, usually around 10-15 simultaneous IMAP connections. Total spool size is 4.2 gigs, this includes stage and all user data. We've designed this system to scale to 1500 accounts per box, but havent fully tested under that load yet though. connections and IMAP spool size) 2) What DRBD protocol are you using A,B or C and over what file system (EXT2, LVM, EXT3 ???) DRBD protocol C / Ext3 3) Are you using block replicated disks for both your IMAP spool your IMAP directory (Mailboxes DB etc)? Yes, we are using block replication for everything directly related to services running on this system. L
Re: backup mail server
drbd configuration file:
resource drbd0 {
protocol=C
fsckcmd=fsck.ext2 -p -y
inittimeout=60
skip-wait=yes
disk {
do-panic
disk-size=66621523
}
net {
sync-rate=6M
tl-size=5000
timeout=60
connect-int=10
ping-int=10
}
on box1 {
device=/dev/nb0
disk=/dev/sda6
address=10.0.0.1
port=7789
}
on box2 {
device=/dev/nb0
disk=/dev/sda6
address=10.0.0.2
port=7789
}
}
Boxes are connected together via serial and etho links.
L
On Saturday, January 11, 2003, at 05:10 PM, [EMAIL PROTECTED] wrote:
On Sat, Jan 11, 2003 at 01:38:11PM -0500, Lee wrote:
We use drbd (http://www.complang.tuwien.ac.at/reisner/drbd/) and
linux-ha's (http://www.linux-ha.org/) heartbeat to create two-box
mailstores (one active, one hotspare, continuously in-sync). Works
beautifully.
Are you using the drdb from CVS on a 2.4.x kernel? Could you provide
details of the drdb version and OS off list?
A copy/paste of your config file would also be great as example, if
they do
not contain too much sensitive data of course which shouldn't be the
case...
Thanks
Marc
C.DTF
Re: backup mail server
Hi Lee,
First thanks for your configuration file... I have a few questions now
regarding your current setup:
- Are you using other tools like heartbeat or in the same kind ? If yes
which tool ?
- From your drbd configuration file I can see that you are using /dev/sda6
as physical disk, is that your Cyrus partition (/var/spool/imap) ?
Thanks
Marc
drbd configuration file:
resource drbd0 {
protocol=C
fsckcmd=fsck.ext2 -p -y
inittimeout=60
skip-wait=yes
disk {
do-panic
disk-size=66621523
}
net {
sync-rate=6M
tl-size=5000
timeout=60
connect-int=10
ping-int=10
}
on box1 {
device=/dev/nb0
disk=/dev/sda6
address=10.0.0.1
port=7789
}
on box2 {
device=/dev/nb0
disk=/dev/sda6
address=10.0.0.2
port=7789
}
}
Boxes are connected together via serial and etho links.
L
On Saturday, January 11, 2003, at 05:10 PM, [EMAIL PROTECTED] wrote:
On Sat, Jan 11, 2003 at 01:38:11PM -0500, Lee wrote:
We use drbd (http://www.complang.tuwien.ac.at/reisner/drbd/) and
linux-ha's (http://www.linux-ha.org/) heartbeat to create two-box
mailstores (one active, one hotspare, continuously in-sync). Works
beautifully.
Are you using the drdb from CVS on a 2.4.x kernel? Could you provide
details of the drdb version and OS off list?
A copy/paste of your config file would also be great as example, if
they do
not contain too much sensitive data of course which shouldn't be the
case...
Thanks
Marc
C.DTF
Re: backup mail server
- Are you using other tools like heartbeat or in the same kind ? If yes
which tool ?
Yes, we're using hearbeat. Heres the requisite config:
/etc/ha.d/haresources:
servname.host.com 100.102.248.46 datadisk::drbd0 cyrus postfix
- From your drbd configuration file I can see that you are using
/dev/sda6
as physical disk, is that your Cyrus partition (/var/spool/imap) ?
sda6 is our data partitiion where we keep /var/spool/imap /var/imap/
/var/spool/mail and all of our configuration files.
L
Thanks
Marc
drbd configuration file:
resource drbd0 {
protocol=C
fsckcmd=fsck.ext2 -p -y
inittimeout=60
skip-wait=yes
disk {
do-panic
disk-size=66621523
}
net {
sync-rate=6M
tl-size=5000
timeout=60
connect-int=10
ping-int=10
}
on box1 {
device=/dev/nb0
disk=/dev/sda6
address=10.0.0.1
port=7789
}
on box2 {
device=/dev/nb0
disk=/dev/sda6
address=10.0.0.2
port=7789
}
}
Boxes are connected together via serial and etho links.
L
On Saturday, January 11, 2003, at 05:10 PM, [EMAIL PROTECTED] wrote:
On Sat, Jan 11, 2003 at 01:38:11PM -0500, Lee wrote:
We use drbd (http://www.complang.tuwien.ac.at/reisner/drbd/) and
linux-ha's (http://www.linux-ha.org/) heartbeat to create two-box
mailstores (one active, one hotspare, continuously in-sync). Works
beautifully.
Are you using the drdb from CVS on a 2.4.x kernel? Could you provide
details of the drdb version and OS off list?
A copy/paste of your config file would also be great as example, if
they do
not contain too much sensitive data of course which shouldn't be the
case...
Thanks
Marc
C.DTF
Re: backup mail server
How long have you been using this setup... and have you ever had any problem... or needed to do a failover.. or a failback? Do you dedicate nics for the replication.. are they GB? Do you have any stats on the typical data rates for the replication under normal load? I've thought about using this setup as a poor mans san for a simple hot spare... but I've not known of anyone actually doing it in production.. so I'm interested to know your experiences. I'll assume you are running on hardware raid.. and doing backups... but what about using the LVM and snapshots? Much thanks you brave soul... Jared Lee wrote: - Are you using other tools like heartbeat or in the same kind ? If yes which tool ? Yes, we're using hearbeat. Heres the requisite config: /etc/ha.d/haresources: servname.host.com 100.102.248.46 datadisk::drbd0 cyrus postfix - From your drbd configuration file I can see that you are using /dev/sda6 as physical disk, is that your Cyrus partition (/var/spool/imap) ? sda6 is our data partitiion where we keep /var/spool/imap /var/imap/ /var/spool/mail and all of our configuration files. L -- -BEGIN GEEK CODE BLOCK- Version: 3.12 GIT/S/B d- s-:+ a- C$ UL$ P--- L+++$ E--- W+++ N++ o+ K- w O- M-- !V PS+ PE Y++ PGP++ t+ 5- X+ R* tv+ b++ DI+ D G e+ h+ r+++ z* --END GEEK CODE BLOCK--
Re: backup mail server
On Sat, 2003-01-11 at 10:26, Ken Murchison wrote: Greg Sidleinger wrote: I have a small cyrus setup that only a few users use but I want to setup some kind of live backup system for it. I would really just like to have two cyrus servers that keep the same mail boxes on them so if one fails (hardware, software crash, smurfs, etc...) the other will have a back up the mail and continue to receive mail. I was reading up on the murder stuff for cyrus but am not sure if it is what I want and if I have the spare systems to support everything. If anyone could point me in the right direction it would be great. Maintaining a hot spare machine _might_ be possible by using the NNTP support in Cyrus 2.2, since this is what NNTP does, but nothing has been done on this front. Thanks for the info. I will be doing a lot more reading up on this stuff for the rest of this month because I plan on replacing my current mail server at the end of the month. First I need to figure out why when sending mail to Gate does not get put into gate mailbox. -- Kenneth Murchison Oceana Matrix Ltd. Software Engineer 21 Princeton Place 716-662-8973 x26 Orchard Park, NY 14127 --PGP Public Key--http://www.oceana.com/~ken/ksm.pgp
Re: backup mail server
We use drbd (http://www.complang.tuwien.ac.at/reisner/drbd/) and linux-ha's (http://www.linux-ha.org/) heartbeat to create two-box mailstores (one active, one hotspare, continuously in-sync). Works beautifully. L On Saturday, January 11, 2003, at 10:26 AM, Ken Murchison wrote: Greg Sidleinger wrote: I have a small cyrus setup that only a few users use but I want to setup some kind of live backup system for it. I would really just like to have two cyrus servers that keep the same mail boxes on them so if one fails (hardware, software crash, smurfs, etc...) the other will have a back up the mail and continue to receive mail. I was reading up on the murder stuff for cyrus but am not sure if it is what I want and if I have the spare systems to support everything. If anyone could point me in the right direction it would be great. Maintaining a hot spare machine _might_ be possible by using the NNTP support in Cyrus 2.2, since this is what NNTP does, but nothing has been done on this front. -- Kenneth Murchison Oceana Matrix Ltd. Software Engineer 21 Princeton Place 716-662-8973 x26 Orchard Park, NY 14127 --PGP Public Key--http://www.oceana.com/~ken/ksm.pgp
Re: backup mail server
On Sat, 11 Jan 2003, Ken Murchison wrote: Maintaining a hot spare machine _might_ be possible by using the NNTP support in Cyrus 2.2, since this is what NNTP does, but nothing has been done on this front. Well, with the exception of IMAP-specific state, such as ACLs and flags, etc... -Rob -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Rob Siemborski * Andrew Systems Group * Cyert Hall 207 * 412-268-7456 Research Systems Programmer * /usr/contributed Gatekeeper
Re: backup mail server
On Sat, Jan 11, 2003 at 01:38:11PM -0500, Lee wrote: We use drbd (http://www.complang.tuwien.ac.at/reisner/drbd/) and linux-ha's (http://www.linux-ha.org/) heartbeat to create two-box mailstores (one active, one hotspare, continuously in-sync). Works beautifully. Are you using the drdb from CVS on a 2.4.x kernel? Could you provide details of the drdb version and OS off list? -- Scott Russell ([EMAIL PROTECTED]) Linux Technology Center, System Admin, RHCE. Dial 877-735-8200 then ask for 919-543-9289 (TTY) msg10372/pgp0.pgp Description: PGP signature
Re: backup mail server
- Original Message - From: Lee [EMAIL PROTECTED] We use drbd (http://www.complang.tuwien.ac.at/reisner/drbd/) and linux-ha's (http://www.linux-ha.org/) heartbeat to create two-box mailstores (one active, one hotspare, continuously in-sync). Works beautifully. I am in the process of testing out this same setup at present under Linux and I have a couple of questions. 1) How large is your Cyrus installation (# of accounts, # of simultaneous connections and IMAP spool size) 2) What DRBD protocol are you using A,B or C and over what file system (EXT2, LVM, EXT3 ???) 3) Are you using block replicated disks for both your IMAP spool your IMAP directory (Mailboxes DB etc)? Thanks Roland Pope
backup mail server
I have a small cyrus setup that only a few users use but I want to setup some kind of live backup system for it. I would really just like to have two cyrus servers that keep the same mail boxes on them so if one fails (hardware, software crash, smurfs, etc...) the other will have a back up the mail and continue to receive mail. I was reading up on the murder stuff for cyrus but am not sure if it is what I want and if I have the spare systems to support everything. If anyone could point me in the right direction it would be great. Greg
