[collectd] Server does not receive client data (network between both looks OK).

[Abhishek Amberkar [अभिषेक]]

On Tue, Oct 11, 2011 at 10:11 PM, Bruno Costacurta
<techie at costacurta.org> wrote:
> Hello,
>
> I'm trying to setup a server / client collectd config.
> The server is running and produces data as expected as shown via Apache
> website.
> The client is also running and sending data but apparently server receives
> nothing. However a test using a telnet between client and server looks OK.
>
> Here-after the config and tcpdump output.
> Maybe my server config is missing something to act as a listener ?
> Maybe a Interface setup ?
> Thanks for your attention and clue.
>
> ##### server config:
> Mode server
> Hostname "YYYYY.lws-hosting.com"
> BaseDir "/var/lib/collectd"
> PIDFile "/var/collectd.pid"
> PluginDir "/usr/lib/collectd"
> TypesDB "/usr/share/collectd/types.db"
>
> LoadPlugin logfile
> <Plugin "logfile">
>  LogLevel "debug"
>  File "/var/log/collectd.log"
>  Timestamp true
>  PrintSeverity true
> </Plugin>
>
> LoadPlugin network
> <Plugin "network">
>  Listen "YYYYY.lws-hosting.com" "22061"
>  Server "YYYYY.lws-hosting.com" "22061"
> </Plugin>
>
> LoadPlugin rrdtool
> <Plugin "rrdtool">
>  DataDir "/var/lib/collectd/rrd"
>  CacheTimeout 900
>  CacheFlush 120
>  WritesPerSecond 50
> </Plugin>
>
> LoadPlugin cpu
> LoadPlugin load
>
> <LoadPlugin "perl">
>  Globals true
> </LoadPlugin>
>
> <Plugin "perl">
>  BaseName "Collectd::Plugins"
>  LoadPlugin "OpenVZ"
> </Plugin>
>
>
> ##### client config:
> Mode client
> Hostname "aspire4750"
> BaseDir "/var/lib/collectd"
> PluginDir "/usr/lib/collectd"
> TypesDB "/usr/share/collectd/types.db"
>
> LoadPlugin logfile
> <Plugin logfile>
>  LogLevel "debug"
>  File "/var/log/collectd.log"
>  Timestamp true
>  PrintSeverity true
> </Plugin>
>
> LoadPlugin rrdtool
> LoadPlugin cpu
> LoadPlugin df
> LoadPlugin disk
> LoadPlugin entropy
> LoadPlugin hddtemp
> LoadPlugin load
> LoadPlugin memory
> LoadPlugin network
>
> <Plugin "network">
>  Server "vps622YYYYY.lws-hosting.com" "22061"
> </Plugin>
>
> LoadPlugin processes
> LoadPlugin swap
> ..etc..
> ..etc..
>
>
> ##### IP packets send by the client to the server:
> tcpdump -i wlan0 port 22061 and host YYYYY.lws-hosting.com
> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> listening on wlan0, link-type EN10MB (Ethernet), capture size 65535 bytes
> 18:17:19.480429 IP aspire4750.local.54746 > XXXXX.22061: UDP, length 881
> 18:17:29.476113 IP aspire4750.local.54746 > XXXXX.22061: UDP, length 912
> 18:17:39.476338 IP aspire4750.local.54746 > XXXXX.22061: UDP, length 871
> 18:17:39.476787 IP aspire4750.local.54746 > XXXXX.22061: UDP, length 883
> 18:17:49.472704 IP aspire4750.local.54746 > XXXXX.22061: UDP, length 913
> 18:17:49.473126 IP aspire4750.local.54746 > XXXXX.22061: UDP, length 908
> ..etc..
> ..etc..
>
> ##### telnet to test connection between client and server:
>
> ## client side:
>  telnet XXXXX 22061
> Trying 93.184.47.217...
> telnet: Unable to connect to remote host: Connection refused (note : correct
> as no telnetd on server port 22061)
>

No. You should be able to connect to the port. Telnetd is not
required. This indicates that your client is not able to connect to
the server. May be there's a firewall issue. Or check if "collectd" is
running on server. Also check logs.

> ## server side:
> /usr/sbin/tcpdump  port 22061 and host XXXXX
> listening on venet0, link-type LINUX_SLL (Linux cooked), capture size 65535
> bytes
> 18:24:23.964418 IP YYYYY.lws-hosting.com.22061 >
> ip-78-141-130-18.dyn.luxdsl.pt.lu.44760: Flags [R.], seq 0, ack 1528218477,
> win 0, length 0
>
> -> so connection between client to server looks correct as server received
> the telnet try from client, correct ?
>
> However the collectd log neither the Apache website shows data from client.
> The data from the server are shown correctly.
>
> I suppose my server config is missing something to act as a listener ?
> Thanks for your attention and clue.
> Bye,
> Bruno
>
>
>
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>



-- 
With Regards
Abhishek Amberkar