Re: [vchkpw] Backup Emailserver?
On Friday, July 25, 2003, at 07:22 AM, Bill Sappington wrote: I am pretty sure that even if you have two physical servers thats how you would set it up. As to how to get one server to recieve _everything_, unconditionaly, and then every know and then look to see if your primary server was alive, then forward everything it had received to your primary server and ONLY your primary server is a mystery to me. If DNS is set up correctly, you can put the domain in rcpthosts (but NOT in virtualdomains or locals) on the secondary server, and it will hold on to it until it can deliver the mail to the primary server. -- Tom Collins [EMAIL PROTECTED] http://sniffter.com/ - info on the Sniffter hand-held Network Tester
Re: [vchkpw] Backup Emailserver?
Hi Nick did you use rsync an small server? What dirs must been synced? We have two servers but they been connected in different datacenters. So one maschine or datacenter fails, the other can backup the first, after the dns-entries are changed. the dns-server was located in an third datacenter and do only dns and mx-backup. Make this constellation sense? Greetings, Jens Forgive me my bad english, normaly i speak german :-) I've got a configuration similar to the first suggestion, and have built redundant pairs of machines using the second configuration, so let me know if you have any more specific questions regarding these sorts of setups. On Fri, 2003-07-25 at 05:22, Rudi wrote: -- "Ehre die kleinen Dinge des Lebens, aus denen setzen sich die Großen zusammen!" EMail: [EMAIL PROTECTED] Handy: 0179-1361016 Buero: 0221-9750820
Re: [vchkpw] Backup Emailserver?
While I am not sure exactly how this works UUNET provides backup SMTP for me. I have an e-mail server at my site, should my site go down for any particular reason they catch my e-mail, and then when my site is back up all the e-mail starts rolling in. Now I know this is handled partialy by my MX record for the domain to whit: mydomain.com MX priority 10 mail.mydomain.com MX priority 15 mail.myisp.com I am pretty sure that even if you have two physical servers thats how you would set it up. As to how to get one server to recieve _everything_, unconditionaly, and then every know and then look to see if your primary server was alive, then forward everything it had received to your primary server and ONLY your primary server is a mystery to me. I know at one time that you had to perform an ETRN _from your primary server_ to get the backup smtp server to start sending all the stuff it collected for you while you were down, but I dont think that is the case anymore, your millage may very. It would seem to me you would want your secondary mail server someplace other then on the network that your primary is should you internet connection go down. On Fri, 25 Jul 2003 12:06:46 +0200, Jens Gassmann <[EMAIL PROTECTED]> wrote: Hi, how do you backup your emailserver forwards precipitate? Can I backup with rsync simply /home/vpopmail and/var/qmail/ on a second server? About ideas and suggestion I would be pleased. Thanks and greetings Jens Gassmann -- Webmaster http://www.atomix.de
Re: [vchkpw] Backup Emailserver?
Rudi- If the servers are not geographically separated, then you can do this fairly easily by simply placing them behind some sort of load-balancing/fail-over device (Foundry, Cisco Local Director, Linux LVS director) and either load balance them or do active/passive failover. For the vpopmail database, if you're using MySQL, you can simply setup MySQL replication, however changes made to the secondary will not replicate back to the primary when it comes back up. For that you would need to run a third MySQL server to act as the update server which then replicates out to both clients. When the primary server came back online you'd simply dump the database on the update server and import that into the client and restart replication. Email files are even easier since you can simply use nfs on a third server, or look into a replicating file system like Coda or Intermezzo (both are supported in the linux kernel, but I have no real experience with either). If you deal in small volume of email, simply rsync'ing when the primary comes back online would probably also work, and copy the mysql database back over wouldn't be too much trouble either. The final option, if you have no hardware to spare for this, to handle smtp/imap/pop3 traffic failover would be to use some of the tools from the Linux-HA project and use a virtual IP to actually receive outside traffic on, and have that migrate to the unfailed server in the event of a failure. I've got a configuration similar to the first suggestion, and have built redundant pairs of machines using the second configuration, so let me know if you have any more specific questions regarding these sorts of setups. On Fri, 2003-07-25 at 05:22, Rudi wrote: > > I've also got a question on this topic: > If I have a primary, and a backup mailserver, and the primary goes off, how > do I automatically redirect clients to the backup mailserver? And how does > one keep the username /password database synced? The other question is, what > happens when the primary comes back online again? How do clients get their > email from the backup server? Do I manually have to copy all the mail onto > the primary server again? > > -- > > Kind Regards > Rudi Ahlers > Tradeleads IT Director > +27 (82) 926 1689 >
Re: [vchkpw] Backup Emailserver?
- Original Message From: Jens Gassmann <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] <[EMAIL PROTECTED]> Subject: [vchkpw] Backup Emailserver? Date: 25/07/03 12:06 > > Hi, > > how do you backup your emailserver forwards precipitate? Can I backup > with rsync simply /home/vpopmail and/var/qmail/ on a second server? > > About ideas and suggestion I would be pleased. > > Thanks and greetings > > Jens Gassmann > > -- > Webmaster http://www.atomix.de > I've also got a question on this topic: If I have a primary, and a backup mailserver, and the primary goes off, how do I automatically redirect clients to the backup mailserver? And how does one keep the username /password database synced? The other question is, what happens when the primary comes back online again? How do clients get their email from the backup server? Do I manually have to copy all the mail onto the primary server again? -- Kind Regards Rudi Ahlers Tradeleads IT Director +27 (82) 926 1689
[vchkpw] Backup Emailserver?
Hi, how do you backup your emailserver forwards precipitate? Can I backup with rsync simply /home/vpopmail and/var/qmail/ on a second server? About ideas and suggestion I would be pleased. Thanks and greetings Jens Gassmann -- Webmaster http://www.atomix.de
