[Xymon] rrd logs and graphs

[Jeremy Laidman]

On 11 March 2015 at 14:18, Vernon Everett <everett.vernon at gmail.com> wrote:

> About now, I am getting a little nervous adding send and expect, because
> unlike telnet and telnets, we are doing ldap and ldaps testing.
>

That's understandable.  A read through the code suggests that at least in
some places, an empty string is equivalent to an undefined string, as the
string length (shown in Sendlen in the debug output) is zero in both
cases.  So until a patch is in place, a work-around might be to define
empty "send" and "expect" strings for those that have none.

Any suggestions?
> I think we have some debug code update recommendations for JC though. :-)
>

 Here's my patch.  I'll push this into the dev list for proposed inclusion
in a future release.

--- lib/netservices.c.orig      2012-07-25 01:48:41.000000000 +1000
+++ lib/netservices.c   2015-03-12 11:18:18.000000000 +1100
@@ -328,9 +328,9 @@
        dbgprintf("Service list dump\n");
        for (i=0; (svcinfo[i].svcname); i++) {
                dbgprintf(" Name      : %s\n", svcinfo[i].svcname);
-               dbgprintf("   Sendtext: %s\n", binview(svcinfo[i].sendtxt,
svcinfo[i].sendlen));
+               dbgprintf("   Sendtext: %s\n",
svcinfo[i].sendtxt!=NULL?binview(svcinfo[i].sendtxt,
svcinfo[i].sendlen):"[null]");
                dbgprintf("   Sendlen : %d\n", svcinfo[i].sendlen);
-               dbgprintf("   Exp.text: %s\n", binview(svcinfo[i].exptext,
svcinfo[i].explen));
+               dbgprintf("   Exp.text: %s\n",
svcinfo[i].exptext!=NULL?binview(svcinfo[i].exptext,
svcinfo[i].explen):"[null]");
                dbgprintf("   Exp.len : %d\n", svcinfo[i].explen);
                dbgprintf("   Exp.ofs : %d\n", svcinfo[i].expofs);
                dbgprintf("   Flags   : %d\n", svcinfo[i].flags);

This produces "[null]" where we would have seen "(null)" on a GNU-based OS,
to differentiate between the two situations.

In the mean time, you could compile a special version of xymond_rrd, and
run it manually on the same data channel as the real one, but have it make
RRD files and log file to a different location.  This shouldn't interfere
with your production Xymon.  Here's one I prepared earlier that works for
me:

sudo -u xymon mkdir /tmp/my-rrd-data/
sudo -u xymon xymoncmd /bin/sh -c 'XYMONTMP=/tmp;
/usr/lib/xymon/server/bin/xymond_channel --channel=data
--log=/tmp/my-rrd-data.log /path/to/xymond_rrd_debug_patch
--rrddir=/tmp/my-rrd-data/ --debug'

This seems to show some really useful stuff that's relevant to solving your
problem.  Some sample debug lines:

15306 2015-03-12 11:36:28 xymond_rrd_debug_patch: Got message 165619
@@data#165619/servername|1426120588.401891|172.16.0.1||servername|vmstat|sunos|ABC
...
15306 2015-03-12 11:36:28 Creating rrd
/tmp/my-rrd-data//servername/vmstat.rrd
15306 2015-03-12 11:36:28 RRD create param 00: 'rrdcreate'
15306 2015-03-12 11:36:28 RRD create param 01:
'/tmp/my-rrd-data//servername/vmstat.rrd'
15306 2015-03-12 11:36:28 RRD create param 02: '-s'
15306 2015-03-12 11:36:28 RRD create param 03: '300'
15306 2015-03-12 11:36:28 RRD create param 04: 'DS:cpu_r:GAUGE:600:0:U'
15306 2015-03-12 11:36:28 RRD create param 05: 'DS:cpu_b:GAUGE:600:0:U'
15306 2015-03-12 11:36:28 RRD create param 06: 'DS:cpu_w:GAUGE:600:0:U'
...
15306 2015-03-12 11:39:42 Got 265 bytes
15306 2015-03-12 11:39:42 xymond_rrd_debug_patch: Got message 165737
@@data#165737/servername|1426120782.080244|172.16.0.2||servername|trends||DEF
15306 2015-03-12 11:39:42 startpos 216644, fillpos 216644, endpos -1
15306 2015-03-12 11:39:42 Flushing
'/servername/tcp.xopiy90404.parameter.rrd' with 1 updates pending, template
'sec'
15306 2015-03-12 11:39:42 Want msg 165738, startpos 216644, fillpos 216644,
endpos -1, usedbytes=0, bufleft=1884603

J
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