sendmail Archives | Eric Thern :: thern dot org :: http://thern.org Migrating servers to new datacenters or IP addresses is never entirely problem free, usually due to many DNS servers on the internet not obeying TTL’s or caching old records for way too long. These old cached DNS records (usually at different ISP’s, major mailservers like google, hotmail, yahoo, etc.) cause problems where they’ll route mail to your old server’s IP even if you update your DNS.  This also results in clients connecting to your old web IP address and not hitting your new server. When migrating static html sites, having two servers online during a migration isn’t a real issue, but when you’ve got database driven websites (forums, blogs, etc.) this will result in updates going to two different sites, causing all sorts of hassles.  The way around this is to set up your old site as a proxy only, and proxy the results to the new IP address. Here’s some configs to allow for proxying Web traffic via Apache, DNS t Thu, 04 Aug 2011 18:28:29 +0000 en hourly 1 http://wordpress.org/?v=3.2.1 sendmail Archives | Eric Thern :: thern dot org :: http://thern.org/system-administration/minimizing-downtime-associated-with-webdnsmail-ip-address-migrations/ http://thern.org/system-administration/minimizing-downtime-associated-with-webdnsmail-ip-address-migrations/#comments Sat, 03 Apr 2010 00:45:34 +0000 Eric Thern http://thern.org/?p=201 Migrating servers to new datacenters or IP addresses is never entirely problem free, usually due to many DNS servers on the internet not obeying TTL’s or caching old records for way too long.

These old cached DNS records (usually at different ISP’s, major mailservers like google, hotmail, yahoo, etc.) cause problems where they’ll route mail [...]]]> http://thern.org/system-administration/minimizing-downtime-associated-with-webdnsmail-ip-address-migrations/feed/ 0 sendmail Archives | Eric Thern :: thern dot org :: http://thern.org/linux-and-freebsd/sendmail-premissions-error-stopping-mail-from-sending-on-centos-5-1/ http://thern.org/linux-and-freebsd/sendmail-premissions-error-stopping-mail-from-sending-on-centos-5-1/#comments Wed, 16 Jan 2008 22:24:11 +0000 Eric Thern http://thern.org/eric/?p=62 Really stupid issue with permissions on CentOS 5.1 and real easy fix, since there were improper permissions on the mqueue and clientmqueue directories.


The Error message:

Tried to send mail via command line using ‘mail’ command, and it returned this error:


can not chdir(/var/spool/clientmqueue/): Permission denied
Program mode [...]]]> http://thern.org/linux-and-freebsd/sendmail-premissions-error-stopping-mail-from-sending-on-centos-5-1/feed/ 0