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	<title>teh fear &#187; linux</title>
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	<link>http://www.tehfear.com</link>
	<description>one sysadmin's crib notes</description>
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		<title>xen iptables redirect problem</title>
		<link>http://www.tehfear.com/2009/02/18/xen-iptables-redirect-problem/</link>
		<comments>http://www.tehfear.com/2009/02/18/xen-iptables-redirect-problem/#comments</comments>
		<pubDate>Wed, 18 Feb 2009 13:17:13 +0000</pubDate>
		<dc:creator>meh</dc:creator>
				<category><![CDATA[iptables]]></category>
		<category><![CDATA[linux]]></category>
		<category><![CDATA[xen]]></category>

		<guid isPermaLink="false">http://www.tehfear.com/?p=25</guid>
		<description><![CDATA[This may not apply to more recent versions of xen and centos, however, running kernel 2.6.18-xen_3.1.0 on CentOS 4.5 I have found that port redirection doesn&#8217;t work as expected.

We have some roaming users who send mail through our mail server using smtp authentication, unfortunately when they connect through a vodafone 3G dongle they have been [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>spamass-milter: how to discard spam</title>
		<link>http://www.tehfear.com/2007/12/11/spamass-milter-how-to-discard-spam/</link>
		<comments>http://www.tehfear.com/2007/12/11/spamass-milter-how-to-discard-spam/#comments</comments>
		<pubDate>Tue, 11 Dec 2007 10:06:24 +0000</pubDate>
		<dc:creator>meh</dc:creator>
				<category><![CDATA[linux]]></category>
		<category><![CDATA[sendmail]]></category>
		<category><![CDATA[spam]]></category>

		<guid isPermaLink="false">http://www.tehfear.com/2007/12/11/spamass-milter-how-to-discard-spam/</guid>
		<description><![CDATA[SpamAssassin is a great tool for filtering out spam email from the rest, and spam email is a real pain these days.
spamass-milter is a sendmail filter that can be used to connect spamassassin and sendmail together (it is one of many different ways, others include amavis and procmail).
spamass-milter is fine if it is being used [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>xen, mysql and tls</title>
		<link>http://www.tehfear.com/2007/10/22/xen-mysql-and-tls/</link>
		<comments>http://www.tehfear.com/2007/10/22/xen-mysql-and-tls/#comments</comments>
		<pubDate>Mon, 22 Oct 2007 09:19:47 +0000</pubDate>
		<dc:creator>meh</dc:creator>
				<category><![CDATA[linux]]></category>
		<category><![CDATA[xen]]></category>

		<guid isPermaLink="false">http://www.tehfear.com/2007/10/22/xen-mysql-and-tls/</guid>
		<description><![CDATA[when first booting xen most people like me (who like to ignore most ot the manual reading until later) will find a xen warning about the thread local storage libraries and how they access memory in a way that xen makes slow. The warning offers the following advice on how to disable it:
mv /lib/tls /lib/tls.disabled [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>is grub complicated?</title>
		<link>http://www.tehfear.com/2007/10/13/is-grub-complicated/</link>
		<comments>http://www.tehfear.com/2007/10/13/is-grub-complicated/#comments</comments>
		<pubDate>Sat, 13 Oct 2007 12:26:00 +0000</pubDate>
		<dc:creator>meh</dc:creator>
				<category><![CDATA[boot]]></category>
		<category><![CDATA[linux]]></category>

		<guid isPermaLink="false">http://www.tehfear.com/2007/10/13/is-grub-complicated/</guid>
		<description><![CDATA[Everytime I need to change something on a co-located server (ours are only about 2 miles from the main office, but it is still a pain if one has to go to the site because a server is not booting up) that requires restarting in a new configuration, I&#8217;m always worried that something might not [...]]]></description>
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		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>lomount &#8211; easy mounting of partitioned loop images</title>
		<link>http://www.tehfear.com/2007/10/10/lomount-easy-mounting-of-partitioned-loop-images/</link>
		<comments>http://www.tehfear.com/2007/10/10/lomount-easy-mounting-of-partitioned-loop-images/#comments</comments>
		<pubDate>Wed, 10 Oct 2007 14:43:52 +0000</pubDate>
		<dc:creator>meh</dc:creator>
				<category><![CDATA[loopfs]]></category>

		<guid isPermaLink="false">http://www.tehfear.com/2007/10/10/lomount-easy-mounting-of-partitioned-loop-images/</guid>
		<description><![CDATA[Mounting a loop file that is a filesystem is no problem
losetup /dev/loop0 my_loop_image
mount /dev/loop my_mount_point

or
mount -o loop my_loop_image my_mount_point
BUT, what if my loop image has partitions?

Well, one way would be to access it from within a xen virtual machine &#8211; as far as I am aware, if you want to run programs like e2fsck on [...]]]></description>
		<wfw:commentRss>http://www.tehfear.com/2007/10/10/lomount-easy-mounting-of-partitioned-loop-images/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>initrd</title>
		<link>http://www.tehfear.com/2007/10/08/initrd/</link>
		<comments>http://www.tehfear.com/2007/10/08/initrd/#comments</comments>
		<pubDate>Mon, 08 Oct 2007 13:04:07 +0000</pubDate>
		<dc:creator>meh</dc:creator>
				<category><![CDATA[boot]]></category>
		<category><![CDATA[linux]]></category>
		<category><![CDATA[xen]]></category>

		<guid isPermaLink="false">http://www.tehfear.com/2007/10/08/initrd/</guid>
		<description><![CDATA[A file, key to the successful boot of many a linux system is the initrd image.
It used to be a simple gzipped loop filesystem, unpacked and mounted by commands similar to
gzip -dc initrd.img > initrd_unzipped.img
mount -o loop initrd_unzipped.img temp_dir
Then files can be tweaked inside &#8216;temp_dir&#8217;, the image is then updated by
umount temp_dir
gzip -9c initrd_unzipped.img > [...]]]></description>
		<wfw:commentRss>http://www.tehfear.com/2007/10/08/initrd/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>resize loop disk image</title>
		<link>http://www.tehfear.com/2007/10/08/resize-loop-disk-image/</link>
		<comments>http://www.tehfear.com/2007/10/08/resize-loop-disk-image/#comments</comments>
		<pubDate>Mon, 08 Oct 2007 10:51:00 +0000</pubDate>
		<dc:creator>meh</dc:creator>
				<category><![CDATA[ext2]]></category>
		<category><![CDATA[linux]]></category>
		<category><![CDATA[loopfs]]></category>
		<category><![CDATA[xen]]></category>

		<guid isPermaLink="false">http://www.tehfear.com/2007/10/08/resize-loop-disk-image/</guid>
		<description><![CDATA[Having started to play with xen on linux, I have begun to use loop filesystems (a filesystem embedded in a file) rather a lot.
Xen virtual servers are, fairly often, run from within a loop filesystem and generally start with a fairly small file (1GB is big for a normal file, but not when it is [...]]]></description>
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		<slash:comments>3</slash:comments>
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