[collectd] Chains and writing question

[Mark Juric]

So is the documentation on Write_Graphite incorrect? What would be the
purpose of having multiple Node blocks available in the plugin if they
aren't accessible? If it is correct, how do you address the configuration
described by a Node block?

On Mon, Feb 2, 2015 at 11:25 AM, Wilfried Goesgens <dothebart at citadel.org>
wrote:

> This PR https://github.com/collectd/collectd/pull/650 would add naming of
> sinks to the log, maybe you want to test a self compiled collectd with this
> patch.
>
> Mon Feb 02 2015 14:07:47 EST from "Mark Juric" <gajillion at gmail.com> Subject:
> [collectd] Chains and writing question
>     All,
> I'm using the write_graphite plugin to write to a graphite cluster. The
> data I'm concerned with is coming from a central "polling" system that, via
> SNMP or the Netapp plugin, queries other appliances incapable of running
> the collectd client. I need this data to reside in a different directory
> when written based on certain host attributes. On a regular system, I
> simply add a "Prefix" to write_graphite and that puts the data in the
> correct place. On a polling machine, that forces the data for the polled
> system to have the same prefix added, putting it in the wrong directory.
>
> It appears that this should be resolvable via chains, but I'm not having
> any success. In the write_graphite documentation, the example configuration
> is described as registering "a writer under this string:
> write_graphite/example" because of the
>
> <Node "example">
> ...
> </Node>
>
> configuration. To that end, I've created a write_graphite configuration
> with multiple nodes and different prefixes:
>
> <Plugin write_graphite>
>   <Node "default">
>     Host "graphite-vip"
>     Port "2003"
>     Prefix "core.wl.syseng-test.dev."
>     SeparateInstances true
>   </Node>
>   <Node "netapp">
>     Host "graphite-vip"
>     Port "2003"
>     Prefix "core.sh5.storage-netapp.prd."
>     SeparateInstances true
>   </Node>
>   <Node "netscaler">
>     Host "graphite-vip"
>     Port "2003"
>     Prefix "core.na.netscaler-lb."
>     SeparateInstances true
>   </Node>
> </Plugin>
>
> How can I access these different nodes as separate writers? My chain
> configuration is complaining that they're invalid following the syntax in
> the wiki:
>
> LoadPlugin "match_regex"
> LoadPlugin "target_write"
> <Chain "PreCache">
>         <Rule "rewrite_netapp">
>                 <Match "regex">
>                         Plugin "netapp"
>                 </Match>
>                 <Target "write">
>                         Plugin "write_graphite/netapp"
>                 </Target>
>                 Target Stop
>         </Rule>
>         <Rule "rewrite_netscaler">
>                 <Match "regex">
>                         Plugin "snmp"
>                 </Match>
>                 <Match "regex">
>                         Host "^netscaler.*"
>                 </Match>
>                 <Target "write">
>                         Plugin "write_graphite/netscaler"
>                 </Target>
>                 Target Stop
>         </Rule>
>
>         # Default target
>         <Target "write">
>                 Plugin "write_graphite/default"
>         </Target>
> </Chain>
>
> Question: Is this possible? And if so, what am I doing wrong? Thanks,
>
> Mark
>
>
>
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>
>
>
>
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