Tag Archives: Nagios

LinuxCon 2010 Just for Fun Poll Results explained

The results of the “Just for Fun” Poll  linux.com community have just been released.  You may be wondering what some of those weird names actually mean, so here goes a short guide for those, like myself, who are not up to date with it all.


Best new Kernel Feature

  1. Btrfs: is a new copy on write filesystem for Linux aimed at implementing advanced features while focusing on fault tolerance, repair and easy administration. Initially developed by Oracle, Btrfs is licensed under the GPL and open for contribution from anyone.

    Linux has a wealth of filesystems to choose from, but we are facing a number of challenges with scaling to the large storage subsystems that are becoming common in today’s data centers. Filesystems need to scale in their ability to address and manage large storage, and also in their ability to detect, repair and tolerate errors in the data stored on disk. [extracted from https://btrfs.wiki.kernel.org/index.php/Main_Page ]

  2. Dynamic Tracing: Dynamic event tracing is one of the newest feature on perf/ftrace. This allows users to dynamically add/remove additional trace-events with various arguments in the kernel. This feature consists of kprobe-based event tracer and ‘perf-probe’ user-space command which helps users to find probe points easily from source code by analyzing kernel debuginfo.  Extracted from http://events.linuxfoundation.org/lfcs2010/tracing
  3. LogFS: is a Linux log-structured and scalable flash filesystem, intended for use on large devices of flash memory. It is written by Jörn Engel and in part sponsored by the CE Linux Forum. [extracted from http://en.wikipedia.org/wiki/LogFS ]
  4. Ceph Filesystem: Ceph is a distributed network file system designed to provide excellent performance, reliability, and scalability. [ extracted from http://ceph.newdream.net/about/ ]


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Lilac Platform error print_window_header()

The Lilac Platform is a collection of tools to enhance existing open
source monitoring applications. Currently the focus is on the Lilac
Configurator, a configuration tool written to configure Nagios, a
popular Network monitoring application.

After installing it on an OpenSuse 11.0 I got the following error.

Fatal error: Call to undefined function print_window_header() in /srv/www/htdocs/html/lilac/index.php on line 32

The answer can be found on this forum http://www.lilacplatform.com/discussion/2/5/37#37

Apparently the subversion has been fixed, but if you download it directly from the site it still has the same problem as above. To get it to work you can change the  the following line in your php.ini

short_open_tag = On“   (the default is off)

“short_open_tags… Tells whether the short form (<? ?>
)
of PHP’s open tag should be allowed. If you want to use PHP in
combination with XML, you can disable this option in order to
use <?xml ?>
inline. Otherwise, you
can print it with PHP, for example: <?php echo '<?xml
version="1.0"'; ?>

. Also if disabled, you must use the
long form of the PHP open tag (<?php ?>
).

This directive also affects the shorthand <?=
,
which is identical to <? echo
. Use of this
shortcut requires short_open_tag

to be on.
” – extracted from php.net

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