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	<title>All things Sysadmin &#187; Sundry sysadmin</title>
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	<link>http://northernmost.org/blog</link>
	<description>Just another manic Monday</description>
	<lastBuildDate>Wed, 26 May 2010 13:21:39 +0000</lastBuildDate>
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		<title>Legitimate emails being dropped by Spamassassin in RHEL5</title>
		<link>http://northernmost.org/blog/legitimate-emails-being-dropped-by-spamassassin-in-rhel5/</link>
		<comments>http://northernmost.org/blog/legitimate-emails-being-dropped-by-spamassassin-in-rhel5/#comments</comments>
		<pubDate>Wed, 26 May 2010 13:21:08 +0000</pubDate>
		<dc:creator>Erik Ljungstrom</dc:creator>
				<category><![CDATA[Sundry sysadmin]]></category>
		<category><![CDATA[rhel5]]></category>
		<category><![CDATA[spam]]></category>
		<category><![CDATA[spamassassnin]]></category>

		<guid isPermaLink="false">http://northernmost.org/blog/?p=266</guid>
		<description><![CDATA[Over the past few months, an increasing number of customers have complained that their otherwise OK spam filters have started dropping an inordinate amount of legitimate emails. ]]></description>
		<wfw:commentRss>http://northernmost.org/blog/legitimate-emails-being-dropped-by-spamassassin-in-rhel5/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Control groups in RHEL6</title>
		<link>http://northernmost.org/blog/control-groups-in-rhel6/</link>
		<comments>http://northernmost.org/blog/control-groups-in-rhel6/#comments</comments>
		<pubDate>Thu, 13 May 2010 17:12:54 +0000</pubDate>
		<dc:creator>Erik Ljungstrom</dc:creator>
				<category><![CDATA[Sundry sysadmin]]></category>

		<guid isPermaLink="false">http://northernmost.org/blog/?p=253</guid>
		<description><![CDATA[One new feature that I'm very enthusiastic about in RHEL6 is Control Groups (cgroup for short). It allows you to create groups and allocate resources to these. You can then bunch your applications into groups at your heart's content. ]]></description>
		<wfw:commentRss>http://northernmost.org/blog/control-groups-in-rhel6/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Building Hiphop PHP gotcha</title>
		<link>http://northernmost.org/blog/building-hiphop-php-gotcha/</link>
		<comments>http://northernmost.org/blog/building-hiphop-php-gotcha/#comments</comments>
		<pubDate>Sun, 21 Feb 2010 03:04:22 +0000</pubDate>
		<dc:creator>Erik Ljungstrom</dc:creator>
				<category><![CDATA[Sundry sysadmin]]></category>
		<category><![CDATA[Webservers]]></category>

		<guid isPermaLink="false">http://northernmost.org/blog/?p=219</guid>
		<description><![CDATA[Tonight I've delved into the world of Facebook's HipHop for PHP. Unfortunately I set about this task on an RHEL 5.4 box, and it hasn't been a walk in the park. Quite a few dependencies were out of date or didn't exist in the repositories, libicu, boost, onig, tbb etc. Though, CMake did a good job of telling me what was wrong, so it wasn't a huge deal, I just compiled the missing pieces from source and put them in $CMAKE_PREFIX_PATH. One thing CMake didn't pick up on however, was that the flex version shipped with current RHEL is rather outdated.]]></description>
		<wfw:commentRss>http://northernmost.org/blog/building-hiphop-php-gotcha/feed/</wfw:commentRss>
		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>Flush bash_history after each command</title>
		<link>http://northernmost.org/blog/flush-bash_history-after-each-command/</link>
		<comments>http://northernmost.org/blog/flush-bash_history-after-each-command/#comments</comments>
		<pubDate>Sun, 05 Oct 2008 02:47:13 +0000</pubDate>
		<dc:creator>Erik Ljungstrom</dc:creator>
				<category><![CDATA[Sundry sysadmin]]></category>
		<category><![CDATA[bash]]></category>
		<category><![CDATA[bash_history]]></category>

		<guid isPermaLink="false">http://northernmost.org/blog/?p=156</guid>
		<description><![CDATA[If you, like me, often work in a lot of terminals on a lot of servers, or even a lot of terminals on the same one, you may recognise the frustration of a lost bash history. ]]></description>
		<wfw:commentRss>http://northernmost.org/blog/flush-bash_history-after-each-command/feed/</wfw:commentRss>
		<slash:comments>4</slash:comments>
		</item>
		<item>
		<title>btrfs &#8211; filesystem to end all filesystems?</title>
		<link>http://northernmost.org/blog/btrfs-filesystem-to-end-all-filesystems/</link>
		<comments>http://northernmost.org/blog/btrfs-filesystem-to-end-all-filesystems/#comments</comments>
		<pubDate>Thu, 04 Sep 2008 02:05:31 +0000</pubDate>
		<dc:creator>Erik Ljungstrom</dc:creator>
				<category><![CDATA[Sundry sysadmin]]></category>
		<category><![CDATA[misc]]></category>
		<category><![CDATA[btrfs]]></category>
		<category><![CDATA[crfs]]></category>
		<category><![CDATA[filesystem]]></category>

		<guid isPermaLink="false">http://northernmost.org/blog/?p=83</guid>
		<description><![CDATA[There are some good stuff on the horizon! It&#8217;s called btrfs (&#8220;butter-fs&#8221;). It was originally announced/&#8221;released&#8221; over a year ago by our friends at Oracle and has, in my opinion, not quite received the attention it deserves. I&#8217;m keeping a close eye on the very intensive devlopment of this as the feature list is very [...]]]></description>
		<wfw:commentRss>http://northernmost.org/blog/btrfs-filesystem-to-end-all-filesystems/feed/</wfw:commentRss>
		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>Some trickery or resilience with Varnish</title>
		<link>http://northernmost.org/blog/some-trickery-or-resilience-with-varnish/</link>
		<comments>http://northernmost.org/blog/some-trickery-or-resilience-with-varnish/#comments</comments>
		<pubDate>Tue, 22 Jul 2008 00:56:11 +0000</pubDate>
		<dc:creator>Erik Ljungstrom</dc:creator>
				<category><![CDATA[Sundry sysadmin]]></category>
		<category><![CDATA[resilience]]></category>
		<category><![CDATA[restart]]></category>
		<category><![CDATA[varnish]]></category>

		<guid isPermaLink="false">http://northernmost.org/blog/?p=33</guid>
		<description><![CDATA[If you've got two or more backends, and under some condition can't or won't serve a request immediately or want to send it elsewhere depending on some circumstance, you can do this using HTTP return code or header with the not-so-well-documented feature 'restart' ]]></description>
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		<slash:comments>3</slash:comments>
		</item>
		<item>
		<title>LVM with dmraid</title>
		<link>http://northernmost.org/blog/lvm-with-dmraid/</link>
		<comments>http://northernmost.org/blog/lvm-with-dmraid/#comments</comments>
		<pubDate>Tue, 15 Jul 2008 21:05:33 +0000</pubDate>
		<dc:creator>Erik Ljungstrom</dc:creator>
				<category><![CDATA[Sundry sysadmin]]></category>
		<category><![CDATA[dmraid]]></category>
		<category><![CDATA[lvm]]></category>

		<guid isPermaLink="false">http://northernmost.org/blog/?p=32</guid>
		<description><![CDATA[hen adding a new disk for a customer running CentOS 4.7 on severely old hardware, I bumped into something I've never had happening to me before. Basically the system wouldn't let me create the Physical Volume]]></description>
		<wfw:commentRss>http://northernmost.org/blog/lvm-with-dmraid/feed/</wfw:commentRss>
		<slash:comments>3</slash:comments>
		</item>
		<item>
		<title>MySQL load balancing with mylbhelper</title>
		<link>http://northernmost.org/blog/mysql-load-balancing-with-mylbhelper/</link>
		<comments>http://northernmost.org/blog/mysql-load-balancing-with-mylbhelper/#comments</comments>
		<pubDate>Sun, 29 Jun 2008 02:59:10 +0000</pubDate>
		<dc:creator>Erik Ljungstrom</dc:creator>
				<category><![CDATA[MySQL]]></category>
		<category><![CDATA[Sundry sysadmin]]></category>
		<category><![CDATA[hardware load balancing]]></category>
		<category><![CDATA[mylbhelper]]></category>
		<category><![CDATA[mysql load balancing]]></category>

		<guid isPermaLink="false">http://northernmost.org/blog/?p=30</guid>
		<description><![CDATA[A customer of ours was in this particular situation. They had a very decent hardware load balancer for their webservers with capacity to spare. So they ended up load balancing the mysql instances through the same device and using a piece of software I've written called <a href="http://mylbhelper.northernmost.org">mylbhelper</a>. 
]]></description>
		<wfw:commentRss>http://northernmost.org/blog/mysql-load-balancing-with-mylbhelper/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
		</item>
		<item>
		<title>MySQL query cache vs. memcached? Ridiculous!</title>
		<link>http://northernmost.org/blog/mysql-query-cache-vs-memcached-ridiculous/</link>
		<comments>http://northernmost.org/blog/mysql-query-cache-vs-memcached-ridiculous/#comments</comments>
		<pubDate>Wed, 19 Mar 2008 23:31:54 +0000</pubDate>
		<dc:creator>Erik Ljungstrom</dc:creator>
				<category><![CDATA[MySQL]]></category>
		<category><![CDATA[Sundry sysadmin]]></category>
		<category><![CDATA[caching]]></category>
		<category><![CDATA[memcache]]></category>
		<category><![CDATA[memcached]]></category>
		<category><![CDATA[mysql]]></category>
		<category><![CDATA[query cache]]></category>

		<guid isPermaLink="false">http://northernmost.org/blog/mysql-query-cache-vs-memcached-ridiculous/</guid>
		<description><![CDATA[Reading around on mailing lists, blog comments and forums etc. about methods of effective caching, I&#8217;ve seen people dismiss any form of caching, such as memcache, with the argument that MySQL has got a query cache anyways. This is what I have to say about that: mysql&#62; show status like "QCache_hits"; +---------------+-------+ &#124; Variable_name &#124; [...]]]></description>
		<wfw:commentRss>http://northernmost.org/blog/mysql-query-cache-vs-memcached-ridiculous/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>mod_log_forensic howto</title>
		<link>http://northernmost.org/blog/mod_log_forensic-howto/</link>
		<comments>http://northernmost.org/blog/mod_log_forensic-howto/#comments</comments>
		<pubDate>Sun, 24 Feb 2008 01:21:06 +0000</pubDate>
		<dc:creator>Erik Ljungstrom</dc:creator>
				<category><![CDATA[Sundry sysadmin]]></category>
		<category><![CDATA[Webservers]]></category>
		<category><![CDATA[apache]]></category>
		<category><![CDATA[mod_log_forensics]]></category>
		<category><![CDATA[mod_unique_id]]></category>

		<guid isPermaLink="false">http://northernmost.org/blog/mod_log_forensic-howto/</guid>
		<description><![CDATA[mod_log_forensic is an often forgotten yet very handy tool in debugging webservers. It gives each request a unique ID which you can then track through your log. It first writes the request prefixed with the unique ID, then it writes the same ID once the request is completed. Very useful to spot scripts which never [...]]]></description>
		<wfw:commentRss>http://northernmost.org/blog/mod_log_forensic-howto/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
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