Re: server mirroring
This is a tough nut to crack. There isn't just a single bullet that will fail over an entire system. You really have to look at applications that will need to fail over one by one and determine how best to deal with these. Some ideas to consider in your architecture: * For web apps, you can rsync files from your staging environment to your live environment as well as your failback box. If your primary box fails, you can bring your failback box online. * If you need failover on web apps, certain J2EE containers will support this, even to the level of failing over sessions to other machines in the cluster. * You can look at linux-ha.org for more ideas * Think about load balancers and IP redirectors along the lines of F5's big-IP or a Cisco LocalDirector, although you can easily replicate some of the functionality that these products provide with a Debian box or two. * For spooling mail in the event of a primary machine failing, look at adding additional MX records to your zone file. * DNS is easy to handle... the O'Reilly DNS and Bind book is great for learning about this. * You do have a backup and recovery plan, don't you? ;) But your question was about automatic, online mirroring of all file changes... again, no silver bullet as far as I know of. Depending on your need, you could NFS mount filesystems off of a file server. In the system fails, mount the filesystems off of another box. If the NFS box fails, then you have problems. For mirroring files, you should definitely look at rsync. This is the best solution to mirroring that I have seen. If you are just talking about files, this is not a terribly difficult problem, but when your apps have data in memory (i.e. session keys, etc.) that you need to recover, this is remarkably trickier. So there are some ideas. phil. Marcin Sochacki wrote: > > Hi! > > I would like to set up a secondary server with a complete mirror of my > main production machine. In case the first one fails I could (manually) > do a switchover. I don't need things like balancing, IP-takeover, etc. > > The ideal solution should include automatic, online mirroring > of all file changes from master server to the secondary one. > > What is your suggestion to solve the problem? > > Marcin > > -- > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED] -- Whirlycott Philip Jacob [EMAIL PROTECTED] http://www.whirlycott.com/phil/ -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: Fwd: hard drive failure under RAID-1
You know, I had software RAID-1 implemented on some 2.2.x box about 2 years ago using two Western Digital drives until one day, both drives failed at the same time. Apparently, there was some hardware bug whereby after ~99 days of uptime, the drives lost power and the controller stopped working. I had put the two identical drives in after reading some RAID docs saying that this was preferable for some kind of undetermined mythical reasons related to "being consistent." But in my case, the risk of a hardware bug downing both drives turned out to be what got me. Software raid is kind of appealing, but ... not sure I'll go down that path again. I'm using a 3ware controller now. phil. Russell Coker wrote: > > The following is something to consider when setting up RAID arrays. At the > moment AFAIK every RAID solution suffers from this problem. :( > > I have a Linux software RAID-1 array consisting of two IBM IDE hard drives. > The latest kernel works the same way as the 2.4.2 kernel I am using on that > machine. > > I have just had them both fail at the same time! They both had quite a > number of bad sectors, however there was no sector that was bad on both > disks! > > The result I would have liked to see would be that when a bad sector is > encountered during a read from disk 0, then disk 1 should then be read. If > the data can be read from disk 1 then it should be written back to disk 0. > If after that disk 0 can be read (the likely result using sector-sparing in > hardware) then it should give lots of huge kprintf() errors and keep running. > > The result I saw was that disk 0 was marked as failed, then when a different > sector failed on disk 1 the ext2 file system saw errors, the system stopped > functioning correctly and needed a hard reset. Then it paniced on boot > because it couldn't add either disk to the RAID-1. Since then I have been > trying to recover it. I wrote a program to read both disks and take data > from disk 1, but take it from disk 0 when disk 1 returned a bad sector. But > this didn't work well because disk 1 had run for some time without disk 0. > > In summary a situation which could have been salvaged by an emergency visit > to a computer store turned into a catastrophy. :( > > -- > http://www.coker.com.au/bonnie++/ Bonnie++ hard drive benchmark > http://www.coker.com.au/postal/ Postal SMTP/POP benchmark > http://www.coker.com.au/projects.html Projects I am working on > http://www.coker.com.au/~russell/ My home page > > -- > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED] -- Whirlycott Philip Jacob [EMAIL PROTECTED] http://www.whirlycott.com/phil/ -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Problems with radiusclient
I have configured my radiusclient and put in a line on radiusclient.conf like that authserver the ip of my radius server. The port is the standart one, on the server everything works fine (it authenticate conections for two cyclades wich came preconfigurated) bu my new client simple doesn`t send any authentaication to the server, well the question is, where can i find documentation to configure the radiusclient Does anyone know how can i do that? I thank any help you can send me. --- -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Problems with radiusclient
I have configured my radiusclient and put in a line on radiusclient.conf like that authserver the ip of my radius server. The port is the standart one, on the server everything works fine (it authenticate conections for two cyclades wich came preconfigurated) bu my new client simple doesn`t send any authentaication to the server, well the question is, where can i find documentation to configure the radiusclient Does anyone know how can i do that? I thank any help you can send me. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
RE: VERY URGENT
:))), 2-3 years ago I was in an active correspondence with some dr. Araba Salim from Lagos, Nigeria. At the end of the day the money is ready to be transferred but... some tax on transaction must be paid :)))... ... not much taking into account the total sum... some 50 000 US$... Lots of people in RSA went for it... greed I think :)). Have a nice day "Jersey" P.S. Sorry that this does not have much to do with Debian but... a bit of warning might help someone :)) -- From: Dmitriy Sent: Tuesday, September 25, 2001 5:48 AM To: [EMAIL PROTECTED] Subject:Re: VERY URGENT <><> -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
server mirroring
Hi! I would like to set up a secondary server with a complete mirror of my main production machine. In case the first one fails I could (manually) do a switchover. I don't need things like balancing, IP-takeover, etc. The ideal solution should include automatic, online mirroring of all file changes from master server to the secondary one. What is your suggestion to solve the problem? Marcin -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: Fwd: hard drive failure under RAID-1
On Tue, 25 Sep 2001 14:01, James wrote: > A question a bit apart, what has happened to RAID autodetect in the 2.4.x > kernels? Works fine for me in 2.4.2, I have several machines doing autodetect in 2.4.2. I have tested autodetect on newer kernels that that but don't recall the details. If you use a kernel with RAID-1 as a module and/or the hard drive driver as a module with an initrd then it won't be autodetected. I suspect that this is the issue you encountered as we seem to all be going to initrd now... -- http://www.coker.com.au/bonnie++/ Bonnie++ hard drive benchmark http://www.coker.com.au/postal/ Postal SMTP/POP benchmark http://www.coker.com.au/projects.html Projects I am working on http://www.coker.com.au/~russell/ My home page -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: Mailserver with accounts seperated from unix-accounts
On Tue, Sep 25, 2001 at 09:09:39AM +0200, Erik Tews wrote: > Hi > But I have not yet heard of an > possibility which makes it possible to have really all account > informations in a sql or ldap-database. It's possible, I've been doing it for about a year. A set of qmail patches that make a MySQL database authoritative for all qmail functions. Advanced mappings and even regexes are possible. The whole system allows completely virtual users with POP3, IMAP and webmail pickup, and allows ESMTP authentication so users can roam and still send mail through our SMTP servers. http://www.iain.cx/unix/qmail/ I'll write a HOWTO if anyone's interested :) gdh -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
globally enabling procmail with exim
Hello, I would like to activate a virus scanning system that is based on procmail. I would like to do this globally for every user on my system, but from the configuration examples and docs of exim, I understand that procmail is by default called only if a ~/.procmailrc file is present. How should I modified exim's config so as to check for existance of /etc/procmailrc first and then continue as before to check for the private ones? Thanks Pf -- --- Pierfrancesco Caci | ik5pvx | mailto:[EMAIL PROTECTED] - http://gusp.dyndns.org Firenze - Italia | Office for the Complication of Otherwise Simple Affairs Linux penny 2.4.7 #1 Thu Jul 26 14:48:56 CEST 2001 i686 unknown -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: converting ext2 to softraid 1 or 5
On Tue, Sep 25, 2001 at 02:17:46PM +0200, Kai Koehler wrote: > hello > > we want to install an software raid system on an existing debian server > the server contains his data on one partition/hd > > whats the easiest way to initialize an software raid 1 or 5 and convert the > existing data with the lowest downtime Put the RAID disks in the server, configure software RAID with these disks, copy your data (dump/restore, tar, cp, whatever), then remove the old disk. You could, if you want to use the original disk in your array, temporary insert an extra disk, mkraid, copy data, and remove the disk and raidhotadd the original disk. For more info look at the Software-RAID-HOWTO. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
converting ext2 to softraid 1 or 5
hello we want to install an software raid system on an existing debian server the server contains his data on one partition/hd whats the easiest way to initialize an software raid 1 or 5 and convert the existing data with the lowest downtime thx kai [EMAIL PROTECTED] -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: Fwd: hard drive failure under RAID-1
A question a bit apart, what has happened to RAID autodetect in the 2.4.x kernels? Thanks On Tue, 25 Sep 2001, Russell Coker wrote: > The following is something to consider when setting up RAID arrays. At the > moment AFAIK every RAID solution suffers from this problem. :( > > > I have a Linux software RAID-1 array consisting of two IBM IDE hard drives. > The latest kernel works the same way as the 2.4.2 kernel I am using on that > machine. > > I have just had them both fail at the same time! They both had quite a > number of bad sectors, however there was no sector that was bad on both > disks! > > The result I would have liked to see would be that when a bad sector is > encountered during a read from disk 0, then disk 1 should then be read. If > the data can be read from disk 1 then it should be written back to disk 0. > If after that disk 0 can be read (the likely result using sector-sparing in > hardware) then it should give lots of huge kprintf() errors and keep running. > > The result I saw was that disk 0 was marked as failed, then when a different > sector failed on disk 1 the ext2 file system saw errors, the system stopped > functioning correctly and needed a hard reset. Then it paniced on boot > because it couldn't add either disk to the RAID-1. Since then I have been > trying to recover it. I wrote a program to read both disks and take data > from disk 1, but take it from disk 0 when disk 1 returned a bad sector. But > this didn't work well because disk 1 had run for some time without disk 0. > > In summary a situation which could have been salvaged by an emergency visit > to a computer store turned into a catastrophy. :( > > -- > http://www.coker.com.au/bonnie++/ Bonnie++ hard drive benchmark > http://www.coker.com.au/postal/ Postal SMTP/POP benchmark > http://www.coker.com.au/projects.html Projects I am working on > http://www.coker.com.au/~russell/ My home page > > > -- > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED] > > -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Fwd: hard drive failure under RAID-1
The following is something to consider when setting up RAID arrays. At the moment AFAIK every RAID solution suffers from this problem. :( I have a Linux software RAID-1 array consisting of two IBM IDE hard drives. The latest kernel works the same way as the 2.4.2 kernel I am using on that machine. I have just had them both fail at the same time! They both had quite a number of bad sectors, however there was no sector that was bad on both disks! The result I would have liked to see would be that when a bad sector is encountered during a read from disk 0, then disk 1 should then be read. If the data can be read from disk 1 then it should be written back to disk 0. If after that disk 0 can be read (the likely result using sector-sparing in hardware) then it should give lots of huge kprintf() errors and keep running. The result I saw was that disk 0 was marked as failed, then when a different sector failed on disk 1 the ext2 file system saw errors, the system stopped functioning correctly and needed a hard reset. Then it paniced on boot because it couldn't add either disk to the RAID-1. Since then I have been trying to recover it. I wrote a program to read both disks and take data from disk 1, but take it from disk 0 when disk 1 returned a bad sector. But this didn't work well because disk 1 had run for some time without disk 0. In summary a situation which could have been salvaged by an emergency visit to a computer store turned into a catastrophy. :( -- http://www.coker.com.au/bonnie++/ Bonnie++ hard drive benchmark http://www.coker.com.au/postal/ Postal SMTP/POP benchmark http://www.coker.com.au/projects.html Projects I am working on http://www.coker.com.au/~russell/ My home page -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: Mailserver with accounts seperated from unix-accounts
Hi Perhaps my description about what I am looking for was a little bit wrong. My problem is not authentification, I would like to have the complete account-database in an sql-database (or ldap). Cyrus for example can authenticate agains nearly everything but I still need to create accounts with cyradm. Postfix for example is able to get username-mapping-informations out of mysql, for example [EMAIL PROTECTED] mapped to local unix user blubf. But I have not yet heard of an possibility which makes it possible to have really all account informations in a sql or ldap-database. But I currently don't know what is possible with postfix and courier. I would like to add new users to my mail-system with an sql-statement like insert into accounts (username, passwort) values.. Does anybody know if this is currently possible with open source software or should I better use for example cyrus and let it authenticate agains mysql or something similar (for example with pam) and create all accounts by hand with cyradm? -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: pop3s package
On Tue, Sep 25, 2001 at 01:34:22PM +1000, Nathan Ridge wrote: > Does anyone know of a debian package for pop3s ? I have been trying to > setup using stunnel but am having a few hassles and was looking around > for a deb package. it's pretty easy to get stunnel working with just about any pop daemon. e.g. stunnel -d 995 -l /usr/sbin/ipop3d ipop3d ditto for imapd and many other daemons (i use it for uucico, to provide encrypted uucp-over-tcp connections) craig -- craig sanders <[EMAIL PROTECTED]> Fabricati Diem, PVNC. -- motto of the Ankh-Morpork City Watch -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
