realtime email backup across computer centers
Hi, How would you realize a realtime email-backup across two different computers in two different computer-centers? Let's say I have a mail-server A in city A and a backup-mail-server B in city B. So if an airplain crashs one computer-center, no email gets lost. I think all mail must be forwarded from server A to B (and must be acknowledged from B) before server A acknowleges incomming mail. Does there exists a solution? Maybe with qmail? Stephan
Re: Which webmail do you prefer? Why?
I confirm with apache 2.0.44/PHP 4.3.1 B. Koba a écrit : On Wed, 7 May 2003 11:48:24 -0400, Joey Hess <[EMAIL PROTECTED]> wrote: I looked at SquirrelMail, but php4 is not supported with apache2. Yes it does. I'm testing the Apache/2.0.45 PHP/4.3.1 combination and it works like a charm. You'll notice a huge speedup in php scripts if you are upgrading from apache 1.x. squirrelmail.org does not recommend using apache2 with it, but I didn't have any problem so far.
Re: exponential mail queue growth postfix - Connection timed out
Hi,
I have done my research on this - it seems that the major part (99%) of
timeouts happen with mail.layer-hosting.com[160.116.16.83].
mm
mimo wrote:
I am not sure if this is directly related to DEBIAN isp but anyway,
since people on this list seem quite experienced I might as well ask you.
This is a postfix-1.1.11 running on RedHat 9.0 (not my fault:) - I
usually have a mail queue of about 500 messages. Last week (and after a
colleague upgraded and left for Australia) the queue started growing
exponentially. Today it's about a 2000 messages sitting there (my q-size
is calculated from 'active' and 'deferred').
I have tried pflogsumm-1.0.4.pl and noticed alot of 'Connection timed
out' messages:
/var/log/maillog:14153
/var/log/maillog.1:31009
/var/log/maillog.2:31069
/var/log/maillog.3:30377
/var/log/maillog.4:20078
/var/log/maillog.5:18484
/var/log/maillog.6:13999
/var/log/maillog.7:15149
I have found something about concurrent connections which might correct
this - any ideas?
That's all I know so far. Any help highly appreciated.
Michael Moritz
/etc/postfix/master.cf
#
==
# service type private unpriv chroot wakeup maxproc command + args
# (yes) (yes) (yes) (never) (50)
#
==
smtpinetn - y - - smtpd
#smtpsinet n - n - - smtpd
# -o smtpd_tls_wrappermode=yes -o smtpd_sasl_auth_enable=yes
#submission inetn - n - - smtpd
# -o smtpd_enforce_tls=yes -o smtpd_sasl_auth_enable=yes
#628 inet n - n - - qmqpd
pickup fifon - y 60 1 pickup
cleanup unixn - y - 0 cleanup
#qmgr fifo n - n 300 1 qmgr
qmgrfifon - y 300 1 nqmgr
#tlsmgr fifo - - n 300 1 tlsmgr
rewrite unix- - y - - trivial-rewrite
bounce unix- - y - 0 bounce
defer unix- - y - 0 bounce
flush unixn - y 1000? 0 flush
smtpunix- - y - - smtp
showq unixn - y - - showq
error unix- - y - - error
local unix - n n - - local
virtual unix- n y - - virtual
lmtpunix- - y - - lmtp
#
# Interfaces to non-Postfix software. Be sure to examine the manual
# pages of the non-Postfix software to find out what options it wants.
# The Cyrus deliver program has changed incompatibly.
#
cyrus unix - n n - - pipe
flags=R user=cyrus argv=/cyrus/bin/deliver -e -m ${extension} ${user}
uucp unix - n n - - pipe
flags=Fqhu user=uucp argv=uux -r -n -z -a$sender -
$nexthop!rmail.postfix ($recipient)
ifmailunix - n n - - pipe
flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)
bsmtp unix - n n - - pipe
flags=Fq. user=foo argv=/usr/local/sbin/bsmtp -f $sender $nexthop
$recipient
*G* mysqld not listening on port 3306
i'm a beginner at mysql server - and i have the following problem i can connect to my database which is residing on my mail server from my web server. the my.cnf looks correct and has the port 3306 set , but can't telnet in eather . if i use mysql --host=x.x.x.x --port=x.x.x.x --usr=root it gives me the following error: Can't connect to MySQL server on x.x.x.x (111) many thanks greg
Re: *G* mysqld not listening on port 3306
On Tue, May 13, 2003 at 01:36:20PM -, Gregory Machin wrote: > i'm a beginner at mysql server - and i have the following problem i can > connect to my database which is residing on my mail server from my web > server. the my.cnf looks correct and has the port 3306 set , but can't > telnet in eather . > > if i use mysql --host=x.x.x.x --port=x.x.x.x --usr=root > it gives me the following error: > Can't connect to MySQL server on x.x.x.x (111) > look at the skip-networking option in my.cnf and comment it. You also have to make sure mysql tables allow root to connect from your client host. Using documentation at mysql.com could be a great idea ;-) -- Emmanuel Lacour Easter-eggs 44-46 rue de l'Ouest - 75014 Paris - France - Métro Gaité Phone: +33 (0) 1 43 35 00 37- Fax: +33 (0) 1 41 35 00 76 mailto:[EMAIL PROTECTED] -http://www.easter-eggs.com
Re: *G* mysqld not listening on port 3306
Gregory Machin wrote: i'm a beginner at mysql server - and i have the following problem i can connect to my database which is residing on my mail server from my web server. the my.cnf looks correct and has the port 3306 set , but can't telnet in eather . if i use mysql --host=x.x.x.x --port=x.x.x.x --usr=root it gives me the following error: Can't connect to MySQL server on x.x.x.x (111) many thanks greg The default debian configuration for mysql has the "skip-networking" option set in my.cnf. That is probably causing your problems. Simply comment that line in my.cnf and restart mysql. Maarten Vink
Re: *G* mysqld not listening on port 3306
"Gregory Machin" <[EMAIL PROTECTED]> wrote on Tue, 13 May 2003 13:36:20 - (UTC): > i'm a beginner at mysql server - and i have the following problem i can > connect to my database which is residing on my mail server from my web > server. the my.cnf looks correct and has the port 3306 set , but can't > telnet in eather . Did you remove/comment out 'skip-networking' in my.cnf? That should be the problem. Mit freundlichen Gruessen / Best regards Dominik Schulz
Re: *G* mysqld not listening on port 3306
On Tue, May 13, 2003 at 01:36:20PM -, Gregory Machin wrote: > i'm a beginner at mysql server - and i have the following problem i can > connect to my database which is residing on my mail server from my web > server. the my.cnf looks correct and has the port 3306 set , but can't > telnet in eather . You've to comment out the 'skip-networking'-entry in /etc/mysql/my.cnf. Bye, Jan.
Re: *G* mysqld not listening on port 3306
Op di 13-05-2003, om 15:36 schreef Gregory Machin: i'm a beginner at mysql server - and i have the following problem i can connect to my database which is residing on my mail server from my web server. the my.cnf looks correct and has the port 3306 set , but can't telnet in eather . if i use mysql --host=x.x.x.x --port=x.x.x.x --usr=root it gives me the following error: Can't connect to MySQL server on x.x.x.x (111) many thanks greg Did you enable your database server to accept connections from outside? The latest version doesn't open a TCP-socket! Kind regards! Diederik de Vries Heemraadsingel 188 3021 DM Rotterdam T: +31-10-4776515 F: +31-10-2440250
Re: realtime email backup across computer centers
On Tue, 2003-05-13 at 10:39, Stephan Poehlsen wrote: > Hi, > > How would you realize a realtime email-backup across two different > computers in two different computer-centers? > > Let's say I have a mail-server A in city A and a backup-mail-server B > in city B. So if an airplain crashs one computer-center, no email gets > lost. > > I think all mail must be forwarded from server A to B (and must be > acknowledged from B) before server A acknowleges incomming mail. You could use DRBD to have your spool-directory mirrored. If machine A goes down, B mounts the DRBD device and takes over the IP address of your mail-service. Voila, you're up again. Downtime: a few seconds... The only real problem I see: If you really want to distribute your servers across two cities (!), you'll need some really good (i.e. stable) connection between both servers or you may face a split-brain situation. A fast Uplink may be nice to as you have to re-sync your whole device every time one of your servers go down. Typically DRBD has some Gbit interconnect through a crossover cable to prevent such a situation due to a switch-failure or something else and provide reasonable fast re-sync times. > Does there exists a solution? Maybe with qmail? The scenario above is completely MTA independent - you can use qmail, sendmail, postfix, exim, courier-mta, $whatever... best regards, Markus -- Markus Oswald <[EMAIL PROTECTED]> \ Unix and Network Administration Graz, AUSTRIA \ High Availability / Cluster Mobile: +43 676 6485415\ System Consulting Fax:+43 316 428896 \ Web Development
Re: realtime email backup across computer centers
I would try an NFS mount + procmail recipe: 1. mount something from server B on server A 2. (on server A) create a procmail recipe to copy all incoming mail additionally onto the mount from server B Michael Moritz Stephan Poehlsen wrote: Hi, How would you realize a realtime email-backup across two different computers in two different computer-centers? Let's say I have a mail-server A in city A and a backup-mail-server B in city B. So if an airplain crashs one computer-center, no email gets lost. I think all mail must be forwarded from server A to B (and must be acknowledged from B) before server A acknowleges incomming mail. Does there exists a solution? Maybe with qmail? Stephan
Re: realtime email backup across computer centers
On Tue, 13 May 2003, mimo wrote: > I would try an NFS mount + procmail recipe: > > 1. mount something from server B on server A > 2. (on server A) create a procmail recipe to copy all incoming mail > additionally onto the mount from server B And what happens if a user retrieves his mail via POP? it should be deleted on both servers. this would require you to patch your POP server and IMAP server btw: the easy way to deliver to 2 machines at once is LDAP. just have 2 maildrops for every email address, 1 on either machine. if the 2nd server is down, the message will be in the mail queue. W.
