PHP Weathermap v0.97a -FAQ

# PHP Weathermap v0.97a

#### Copyright © 2005-2010 Howard Jones, `howie@thingy.com`. (Website)

## FAQ & Useful Tips

### FAQs

Here are a few things that have come up more than once from previous versions. Also, it's worth checking the online copy of this document, which will be updated over time.

If something isn't described here, check the cacti.log for errors. 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!

I get some error about 'module not found', or similar...can you help?

  The answer is probably no, or at least not directly. In most cases, this is the result of a missing dependency, either PHP with no GD, or with an older version, or without PHP support, or without TrueColour support. I do try to extend weathermap to make these error messages more explanatory wherever possible, but ultimately, you need to get PHP working first.

  Beware that on some systems you can have a working GD in your 'web' PHP (mod_php) and still have a non-working command-line PHP - Debian and derivatives (Ubuntu) can suffer from this.

  Also be sure that the PHP you get from the command-line is the same installation as you expect - 'which php' and 'whereis php' will provide some *nix users with an idea that they are running the right one, as does 'php -m' and 'php -v' (is it the version you expect?). Also, some packaged PHP systems (MAMP, XAMPP, WAMP etc) have the module installed, but disabled by default. Check your php.ini to see if there is a commented-out line like 'extension=php_gd.dll'.

  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 `php check.php` from the command-line for the CLI (Cacti Poller/command-line tool) version.

I don't see ANYTHING in the logs when using the Cacti plugin.

  Check if this is still the case when Weathermap is the only plugin. If a plugin dies completely, it takes the poller and any remaining plugins with it. This appears to be a problem with some older versions of 'Reports' in particular, where anything listed after Reports in the plugins[] list will not be run.

I get an error message about function_exists()

  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 support 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.

  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 `php check.php` from the command-line for the CLI (Cacti Poller/command-line tool) version.

My maps don't get created/updated (or "This map hasn't been created yet")

  This is almost always a permissions problem. Look in your cacti.log for lines starting WEATHERMAP to see what is going wrong.

I've defined some OVERLIBGRAPH lines, but nothing appears in the map HTML when I use the command-line tool.

  For historical reasons, the default format for HTMLSTYLE is 'static' which avoids javascript. To get the overlib graphs to appear you need to have 'HTMLSTYLE overlib' near the top of your map configuration file.

When I use OVERLIBGRAPH and the pointer is near the right side of the screen, the floating graph disappears off the side of the screen...

  If you set OVERLIBWIDTH and OVERLIBHEIGHT 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.

  Typically one size is right for all your graphs, so this is a good example of something you can add into NODE DEFAULT (or LINK DEFAULT).

The value from my RRD data is much too big!

  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 'gauge:' as a prefix.

  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.

The timestamp on my map is all wrong!

  I have not seen this one myself, but a Chinese user has, and it seems that PHP doesn't always use your system timezone correctly. The fix is to edit php.ini to change date.timezone

Weathermap just dies without warning on my Debian/Ubuntu system
OR... I get a blank screen in the editor when I add a node
OR... I get a segmentation fault when Weathermap runs

  It's a GD bug. It's documented here, 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.

  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.

  Since 0.95, there is a small program supplied with Weathermap to test for this problem. Run `php check-gdbug.pgp` in the weathermap directory to see if it really is this problem that affects you.

  There is more information about fixing this issue for Debian Etch (and perhaps also Ubuntu Edgy) in this Cacti Forum thread.

Where can I find some icons to use with Weathermap? Why don't you have any supplied with it?

  There are plenty of sources online. A good google search would be 'visio network icons'. Some to get you started:

  - Cisco's distinctive icons in a number of formats, and I have converted a set of these into PNG with transparency, too.
  - Nagios Exchange has icons for network maps
  - For your own use only, you could use the ones that come with MS Visio. Obviously these can't be redistributed!
  As for the second part, I can't draw, and I don't know of any freely distributable icons. Feel free to draw some for me, and make them open source.
How can I embed an image (like my company's logo) in my maps? I don't want to have to create a special background...

  You can create a NODE with no links and no label, but with an ICON. The ICON is your logo. You can also use this to embed images from somewhere else - even dynamically produced ones - how about MRTG graphs or RRD stripgraphs embedded in your map?

I need to have a link that isn't just a straight line...how can I do this?

  You can use the VIA keyword to make a link go around corners.:

      LINK bendylink
       NODES node1 node2
       VIA 200 300
       VIA 360 240

I need to have more than one link from node A to node B, but they just overlap...how can I do this?

  See this article for more about parallel links.

I still have two links, but I use MLPPP, and I want to see a single link on the map for both physical lines.

  See this article for more about parallel and aggregated links.

When will you make the editor work like XYZ?

  Adding the editor in 0.7 has made adding a new core weathermap into something that needs more consideration. Anything that dramatically changes how you make a map (like the LINK DEFAULT and NODE DEFAULT changes for 0.7) should mean a similarly big change in the editor. All the options should really be editable from the editor too. In reality, just getting the editor to run smoothly on more than one browser is sometimes painful, let alone re-tooling it to add new features. With that all said, there very likely will be a new version of the editor in 0.9, with drag & drop editing, and (more) complete support for all the new features since 0.6 (which is the version that the editor really was written for - it was written before I added new 0.7 features. D'oh!).

Will you extend weathermap to do XYZ?

  It depends. I have an internal idea of what I want weathermap to be like. I don't want it to feel (too much) like a small program with everyone's wishlist bolted on afterwards. If it seems like something that a number of people could use, and doesn't dramatically change the direction of the program (it won't get mail-reading capability anytime soon), then it stands a better chance. Things that take dozens of parameters to adjust something very subtle are less likely. Ultimately, it is a GPLed program though, so you can always add your own features! I try to keep a todo list on the website for current work-in-progress. Obviously, things that I want are always sensible and useful`:-)` .

  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 always a possibility, but it sometimes is. If it's a good idea, then I'll probably add it anyway, but if it's something special to you, or that you want in a particular timescale, then maybe we can talk!

How can I possibly repay you for making my life and work so much easier?

  Actually, this one isn't very frequent. If you do find yourself asking it, feel free to make a donation, or send a gift, though. However, I do like to hear from users anyway - it's nice to know that people do use this thing.