Wednesday, March 30, 2005

heartbeat won't start zope

Today I was installing a web cluster with the usual heartbeat/drbd stuff. The customer also needs zope because a part of the web site requires it, so I went and built a fresh rpm of it (link to zope rpm).
I then added zope to the haresources file, only to find out that heartbeat will cowardly refuse to start it!

When heartbeat starts to acquire resources it checks the status first by running resource status.
The problem is that the zope rc script prints 'not running' when it cannot find any zope instance running and heartbeat resource manager greps the zope status output for [Rr]unning, to decide whether it must start zope or it is already started for whatever reason.

The solution should be already in heartbeat cvs for some time now and was proposed by Lars Ellemberg of the drbd project. See this link for details:
http://lists.linux-ha.org/pipermail/linux-ha/2004-June/011154.html

Wednesday, March 23, 2005

Courier IMAP - vpopmail troubles

I like the qmail/vpopmail solution as a email server a lot and use it in lots of places. Usually there is only one domain, but in one special case I had to create more than one. I also use courier-imap as imap/pop3 daemon because of its support for vpopmail.
So last week I went to create a new virtual domain on this site and at first all seemed to work fine, but after a while users on the new virtual domains reported login errors.
After some googling I searched the vpopmail mailing lists and found the following posts:

http://www.mail-archive.com/vchkpw@inter7.com/msg09933.html
http://www.mail-archive.com/vchkpw@inter7.com/msg09943.html

Since I usually install qmail on SuSE linux systems I wanted to modify the rpm of courier-imap (version 3.0.8) so that it would also build the needed authvchkpw . This turned out not to be easy and required a modification to the spec file that I am attaching here:


--- courier-imap.spec.orig 2005-03-21 09:51:21.000000000 +0100
+++ courier-imap.spec 2005-03-22 16:45:34.544423142 +0100
@@ -317,6 +317,11 @@

%{__chmod} 555 $RPM_BUILD_ROOT%{_datadir}/sysconftool-rpmupgrade

+# (Umberto, Prometeo SRL 2005)
+# Make sure authvchkpw gets copied int libexec/authlib
+#
+cp -f authlib/authvchkpw $RPM_BUILD_ROOT%{_libexecdir}/authlib
+
#
# Check if authdaemond was installed, make sure to include authdaemon
# directory
@@ -469,6 +474,7 @@

%dir %{_libexecdir}
%dir %{_libexecdir}/authlib
+%attr(755, root, root) %{_libexecdir}/authlib/authvchkpw
%dir %{_sysconfdir}
%dir %{_sysconfdir}/shared
%dir %{_sysconfdir}/shared.tmp
To use it simply extract the courier-imap.spec file in rpm/SPECS and patch it. Then move the courier imap sources in rpm/SOURCES and build normally.
These are the directions for building courier rpms:
http://www.courier-mta.org/FAQ.html#rpm

Cheers,
Umberto

Tuesday, March 08, 2005

Terminator to become a reality in 30 years?

According to this (old) article machines could be able to take over human beings in 30 years, by creating super intelligent computers. Even if that was true we it would not take long to defeat them by creating simple loopholes!