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Line No. Rev Author Line
11simandl<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
2 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
3 
4<html lang="en" xml:lang="en">
5<head>
6 <link rel="stylesheet" type="text/css" media="screen" href=
7 "weathermap.css" />
8 <meta name="generator" content=
9 "HTML Tidy for Mac OS X (vers 1st December 2004), see www.w3.org" />
10 
11 <title>PHP Weathermap
1285simandlv0.97a
131simandl -FAQ</title>
14<style type="text/css" media="print">
15/*<![CDATA[*/
16body { font-size: 12pt; }
17a { color: black; text-decoration: underline; font-weight: normal;}
18/*]]>*/
19</style>
20</head>
21 
22<body>
23 <div id="frame">
24 
25<div class="navcontainer">
26 <ul id="navlist">
27 <li><a href="main.html">Main Page</a></li>
28 <li><a href="main.html#installation">Installation</a></li>
29 <li><a href="main.html#basics">Basics</a></li>
30 <li><a href="faq.html">FAQ and Tips</a></li>
31 <li><a href="main.html#example">Sample Map</a></li>
32 <li><a href="cli-reference.html">CLI Reference</a></li>
33 <li><a href="config-reference.html">Config Reference</a></li>
34 <li><a href="advanced.html">Advanced Topics</a></li>
35 <li><a href="editor.html">Editor</a></li>
36 <li><a href="cacti-plugin.html">Cacti Plugin</a></li>
37 <li><a href="http://www.network-weathermap.com/">Site</a></li>
38 </ul>
39</div>
40 
41<div id="header">
42 <h1>PHP Weathermap
4385simandlv0.97a
441simandl</h1>
4585simandl <h4>Copyright &copy; 2005-2010 Howard Jones, <tt><a
461simandlhref="mailto:howie@thingy.com">howie@thingy.com</a></tt>. (<a
47href="http://www.network-weathermap.com/">Website</a>)</h4>
48</div>
49 
50 
51 <h2><a name="faq" id="faq">FAQ &amp; Useful Tips</a></h2>
52 
53 <h3>FAQs</h3>
54 
55 <p>Here are a few things that have come up more than once from
56 previous versions. Also, it's worth checking the <a href=
57 "http://www.network-weathermap.com/">online
5885simandl copy</a> of this document, which will be updated over time. </p>
59 <p class="important">If something isn't described here, <em>check the cacti.log for errors</em>. Weathermap usually produces a useful error message if there is a problem. Next, try setting Cacti's Log Level to DEBUG for 10 minutes, and then have a look in cacti.log. Don't forget to turn the Log Level back down again! </p>
601simandl 
61 <dl class="faq">
62 <dt><a name="module_not_found"></a>I get some error about 'module not found', or
63 similar...can you help?</dt>
64 
65 <dd><p>The answer is probably no, or at least not directly. In
66 most cases, this is the result of a missing dependency,
67 either PHP with no GD, or with an older version, or without
68 PHP support, or without TrueColour support. I do try to
69 extend weathermap to make these error messages more
70 explanatory wherever possible, but ultimately, you need to
71 get PHP working first. </p><p>Beware that on some systems you can
72 have a working GD in your 'web' PHP (mod_php) and still have
73 a non-working command-line PHP - Debian and derivatives (Ubuntu) can suffer from this. </p><p>Also be sure that the PHP you
74 get from the command-line is the same installation as you
75 expect - 'which php' and 'whereis php' will provide some *nix
76 users with an idea that they are running the right one, as
77 does 'php -m' and 'php -v' (is it the version you expect?).
78 Also, some packaged PHP systems (MAMP, XAMPP, WAMP etc) have
79 the module installed, but disabled by default. Check your
80 php.ini to see if there is a commented-out line like
8185simandl 'extension=php_gd.dll'. </p>
82 <p>In 0.91 and newer, you may find the check.php to be useful when figuring out which php.ini and php version you should be looking at - http://yourserver/plugins/weathermap/check.php for the webserver (editor/rebuild now) version, and <tt>php check.php</tt> from the command-line for the CLI (Cacti Poller/command-line tool) version. </p>
831simandl </dd>
84 
85 <dt><a name="see_nothing"></a>I don't see ANYTHING in the logs when using the Cacti
86 plugin.</dt>
87 
88 <dd><p>Check if this is still the case when Weathermap is the
89 only plugin. If a plugin dies completely, it takes the poller
90 and any remaining plugins with it. This appears to be a
9185simandl problem with some older versions of 'Reports' in particular, where
921simandl anything listed after Reports in the plugins[] list will not
9385simandl be run. </p>
941simandl </dd>
95 
96 
97 <dt><a name="nofunction"></a>I get an error message about function_exists()</dt>
98 
99 <dd><p>This is PHP telling you that a function that Weathermap requires is not available in your PHP installation. Usually, it's to do with either GD, or FreeType. It can be that you have those libraries, but not current enough versions, or versions compiled without particular options. For example, it's possible to have FreeType installed, GD installed, the php-gd module installed, but that the GD library wasn't compiled with FreeType <em>support</em> so they don't know how to talk to each other. This tends to be less of a problem on packaged systems than where you build your own libraries. </p>
10085simandl <p>In 0.91 and newer, you may find the check.php to be useful when figuring out which php.ini and php version you should be looking at, and which functions might be missing - http://yourserver/plugins/weathermap/check.php for the webserver (editor/rebuild now) version, and <tt>php check.php</tt> from the command-line for the CLI (Cacti Poller/command-line tool) version. </p>
1011simandl 
102 </dd>
103 
104 <dt><a name="nothumb"></a>My maps don't get created/updated (or "This map hasn't been created yet")</dt>
105 
106 <dd><p>This is almost always a permissions problem. Look in your cacti.log for lines starting WEATHERMAP to see what
107 is going wrong. </p></dd>
108 
109 <dt><a name="no_overlib"></a>I've defined some <a href="config-reference.html#LINK_OVERLIBGRAPH">OVERLIBGRAPH</a> lines, but nothing appears
110 in the map HTML when I use the command-line tool.</dt>
111 
112 <dd><p>For historical reasons, the default format for <a href="config-reference.html#GLOBAL_HTMLSTYLE">HTMLSTYLE</a>
113 is 'static' which avoids javascript. To get the overlib
114 graphs to appear you need to have <a href="config-reference.html#GLOBAL_HTMLSTYLE">'HTMLSTYLE</a> overlib' near
11585simandl the top of your map configuration file. </p></dd>
1161simandl 
11785simandl<dt><a name="overliboffscreen"></a>When I use <a href="config-reference.html#LINK_OVERLIBGRAPH">OVERLIBGRAPH</a> and the pointer is near the right side of the screen, the floating graph disappears off the side of the screen...</dt>
118<dd><p>If you set <a href="config-reference.html#LINK_OVERLIBWIDTH">OVERLIBWIDTH</a> and <a href="config-reference.html#LINK_OVERLIBHEIGHT">OVERLIBHEIGHT</a> correctly, then Weathermap can make a better guess about whether to show the map to the left or right. Be careful to set them to the correct value, or you may see strange 'flashing' graphs. The easiest way is to right-click on the graph in your browser and read the sizes from the Properties panel. </p>
119<p>Typically one size is right for all your graphs, so this is a good example of something you can add into <a href="config-reference.html#NODE_NODE">NODE</a> DEFAULT (or <a href="config-reference.html#LINK_LINK">LINK</a> DEFAULT). </p>
120</dd>
1211simandl <dt><a name="gauges"></a>The value from my RRD data is much too big!</dt>
122 
12385simandl <dd><p>Is it about 8 times too big, by any chance? Historically, Weathermap was mainly used for SNMP Interface statistics, which use bytes-per-second counters ("octet counters" in SNMP-speak). Because of this, the standard RRD datasource plugin multiplies everything by 8, to get back to bits-per-second. New in 0.9, you can get the 'raw' value from an RRD file by using <a href="targets.html#rrd">'gauge:' as a prefix</a>. </p><p>If the value is wrong by some other constant factor, you can use the 'scale:' prefix to multiply or divide by that factor - e.g divide by 1000 to turn a milliseconds value into a 'real' seconds value, or multiply by 1024 to get a kilobytes values from a megabytes one. </p></dd>
1241simandl 
12585simandl 
1261simandl <dt><a name="timezone"></a>The timestamp on my map is all wrong!</dt>
127 
128 <dd><p>I have not seen this one myself, but a Chinese user has, and
129 it seems that PHP doesn't always use your system timezone correctly. The fix is to edit php.ini to change date.timezone </p></dd>
130 
131 
13285simandl <dt><a name="gdbug"></a>Weathermap just dies without warning on my Debian/Ubuntu system<br/>OR... I get a blank screen in the editor when I add a node<br />OR... I get a segmentation fault when Weathermap runs</dt>
1331simandl 
134 <dd><p> It's a GD bug. It's documented <a href="http://bugs.libgd.org/4">here</a>, and the reason it mainly affects Debian is that Debian links to the system GD (version 2.0.33) not the built-in PHP one (2.0.28ish). For whatever reason, the problems aren't present in the PHP GD library, which has a different alpha-blending implementation as far as I can see from the docs. </p>
13585simandl<p>The bugs are apparently fixed in GD 2.0.34, which has been released and is in Debian unstable. Users report that upgrading to the version of libgd2-xpm from unstable will fix this problem if you can't wait, or recompile PHP to use it's own GD library. </p>
136<p>Since 0.95, there is a small program supplied with Weathermap to test for this problem. Run <code>php check-gdbug.pgp</code> in the weathermap directory to see if it really is this problem that affects you. </p>
137<p>There is more information about fixing this issue for Debian Etch (and perhaps also Ubuntu Edgy) in <a href="http://forums.cacti.net/viewtopic.php?t=21517">this Cacti Forum thread</a>. </p>
1381simandl</dd>
139 <dt><a name="icons"></a>Where can I find some icons to use with Weathermap? Why
140 don't you have any supplied with it?</dt>
141 
142 <dd><p>
143 There are plenty of sources online. A good google search
144 would be 'visio network icons'. Some to get you started:
145 
146 <ul>
147 <li><a href=
148 "http://www.cisco.com/web/about/ac50/ac47/2.html">Cisco's
149 distinctive icons</a> in a number of formats, and I have converted a
150 set of these into <a href="http://wotsit.thingy.com/haj/cacti/">PNG with transparency</a>, too.</li>
151 
152 <li><a href="http://www.nagiosexchange.org/">Nagios
153 Exchange</a> has icons for network maps</li>
154 
155 <li>For your own use only, you could use the ones that
156 come with MS Visio. Obviously these can't be
157 redistributed!</li>
158 </ul>As for the second part, I can't draw, and I don't know
159 of any freely distributable icons. Feel free to draw some
16085simandl for me, and make them open source. </p>
1611simandl </dd>
162 
163 <dt><a name="logo"></a>How can I embed an image (like my company's logo) in my
164 maps? I don't want to have to create a special
165 background...</dt>
166 
167 <dd><p>You can create a <a href="config-reference.html#NODE_NODE">NODE</a> with no links and no label, but
168 with an <a href="config-reference.html#NODE_ICON">ICON.</a> The <a href="config-reference.html#NODE_ICON">ICON</a> is your logo. You can also use this to
169 embed images from somewhere else - even dynamically produced
170 ones - how about MRTG graphs or RRD stripgraphs embedded in
17185simandl your map? </p></dd>
1721simandl 
173 <dt><a name="curves"></a>I need to have a link that isn't just a straight
174 line...how can I do this?</dt>
175 
176 <dd><p>
177 You can use the <a href=
178 "config-reference.html#LINK_VIA">VIA</a> keyword to make a
179 link go around corners.:
180 
181 <div class="shell">
182 <pre>
183<a href="config-reference.html#LINK_LINK">LINK</a> bendylink
184 <a href="config-reference.html#LINK_NODES">NODES</a> node1 node2
185 <a href="config-reference.html#LINK_VIA">VIA</a> 200 300
186 <a href="config-reference.html#LINK_VIA">VIA</a> 360 240
187</pre>
18885simandl </div> </p>
1891simandl </dd>
190 
191 <dt><a name="parallel"></a>I need to have more than one link from node A to node B,
192 but they just overlap...how can I do this?</dt>
193 
19485simandl <dd><p>See <a href="http://www.network-weathermap.com/articles/parallel">this article</a> for more about parallel links. </p>
1951simandl </dd>
196 
197 <dt><a name="aggregate"></a>I still have two links, but I use MLPPP, and I want to
198 see a single link on the map for both physical lines.</dt>
199 
200 <dd>
20185simandl <p>See <a href="http://www.network-weathermap.com/articles/parallel">this article</a> for more about parallel and aggregated links. </p>
2021simandl </dd>
203 
204 <dt><a name="editor_requests"></a>When will you make the editor work like
205 <em>XYZ</em>?</dt>
206 
207 <dd><p>Adding the editor in 0.7 has made adding a new core
208 weathermap into something that needs more consideration.
209 Anything that dramatically changes how you make a map (like
210 the <a href="config-reference.html#LINK_LINK">LINK</a> DEFAULT and <a href="config-reference.html#NODE_NODE">NODE</a> DEFAULT changes for 0.7) should
211 mean a similarly big change in the editor. All the options
212 should really be editable from the editor too. In reality,
213 just getting the editor to run smoothly on more than one
214 browser is sometimes painful, let alone re-tooling it to add
215 new features. With that all said, there very likely will be a
216 new version of the editor in 0.9, with drag &amp; drop
217 editing, and (more) complete support for all the new features
218 since 0.6 (which is the version that the editor really was
219 written for - it was written before I added new 0.7 features.
22085simandl D'oh!). </p></dd>
2211simandl 
222 <dt><a name="feature_requests"></a>Will you extend weathermap to do <em>XYZ</em>?</dt>
223 
224 <dd><p>It depends. I have an internal idea of what I want
225 weathermap to be like. I don't want it to feel (too much)
226 like a small program with everyone's wishlist bolted on
227 afterwards. If it seems like something that a number of
228 people could use, and doesn't dramatically change the
229 direction of the program (it won't get <a href=
230 "http://en.wikipedia.org/wiki/Zawinski's_Law_of_Software_Envelopment"
231 title="jwz's law of software envelopment">mail-reading
232 capability</a> anytime soon), then it stands a better chance.
233 Things that take dozens of parameters to adjust something
234 very subtle are less likely. Ultimately, it is a GPLed
235 program though, so <i>you</i> can <i>always</i> add your own
236 features! I try to keep a todo list on the website for
237 current work-in-progress. Obviously, things that <i>I</i>
23885simandl want are <i>always</i> sensible and useful<tt>:-)</tt> . </p>
2391simandl 
24085simandl <p>In the past, people have paid to have features added. I have a day job which pays for my food and my mortgage, so this isn't
241 <em>always</em> a possibility, but it sometimes is. If it's a good idea, then I'll probably add it anyway, but if it's something
242 special to you, or that you want in a particular timescale, then maybe we can talk! </p>
243</dd>
244 
2451simandl <dt><a name="repayme"></a>How can I possibly repay you for making my life and work
246 so much easier?</dt>
247 
248 <dd><p>Actually, this one isn't very frequent. If you do find
249 yourself asking it, feel free to <a href="http://www.network-weathermap.com/support/donate">make a donation, or send a gift,</a>
250 though. However, I do like to <a href="http://www.network-weathermap.com/contact">hear from users</a> anyway - it's nice to
25185simandl know that people do use this thing. </p></dd>
2521simandl </dl>
253 </div>
254</body>
255</html>

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