[smokeping-users] No data being displayed for slave machine

[G.W. Haywood]

Hi David,

On Sat, 21 Jun 2008, David Tomic wrote:

> > rrdtool dump /var/lib/smokeping/World/Europe/UK/WWW3-HTTP.rrd >WWW3-HTTP.xml
> >
>
> You're talking about the .rrd file thats created/stored on the master
> machine correct?

Yes.  I'm assuning all your .rrd files are stored on the master.

> >         <lastupdate> 1213965501 </lastupdate> <!-- 2008-06-20 13:38:21 BST -->
>
> No ... I don't think that it is actually.  The <lastupdate> time looks
> like the initial creation date of the .rrds by the master machine.

You mean that in _your_ file it looks like the file isn't being updated?
Can you verify that this is not the case for files which are being updated?

> Where does that put us then?

You have to find out why the master says to the slave that it has the
data but then the data doesn't manage to get written to the file.  Are
the permissions on your .rrd files all the same?

Here are the Apache processes on my master server:

tornado:~# >>> ps axfuww | grep apache
root      3310  0.0  0.0  32196  2568 ?        Ss   12:35   0:00 /usr/sbin/apache
www-data  3314  0.0  0.0  32332  1528 ?        S    12:35   0:00  \_ /usr/sbin/apache
www-data  3315  0.0  0.0  32332  1528 ?        S    12:35   0:00  \_ /usr/sbin/apache
www-data  3317  0.0  0.0  32332  1528 ?        S    12:35   0:00  \_ /usr/sbin/apache
www-data  3318  0.0  0.0  32332  1528 ?        S    12:35   0:00  \_ /usr/sbin/apache
www-data  3319  0.0  0.0  32332  1528 ?        S    12:35   0:00  \_ /usr/sbin/apache
www-data  3541  0.0  0.0  32332  1524 ?        S    12:36   0:00  \_ /usr/sbin/apache

Here are the processes owned by user 'smokeping'

tornado:~# >>> ps -o pid,fuser=User_Name,pid,pcpu,stat,comm --user smokeping
  PID User_Name   PID %CPU STAT COMMAND
 3433 smokeping  3433  0.0 Ss   smokeping
 3435 smokeping  3435  0.0 S    smokeping
 3442 smokeping  3442  0.0 S    smokeping
 3444 smokeping  3444  0.0 S    smokeping
 3445 smokeping  3445  0.0 S    smokeping
 3446 smokeping  3446  0.0 S    smokeping
 3447 smokeping  3447  0.0 S    smokeping
 3449 smokeping  3449  0.0 S    smokeping
 3451 smokeping  3451  0.0 S    smokeping
 3452 smokeping  3452  0.0 S    smokeping
 3453 smokeping  3453  0.0 S    smokeping
 3458 smokeping  3458  0.0 S    smokeping
 3460 smokeping  3460  0.0 S    smokeping
 3463 smokeping  3463  0.0 S    smokeping
 3466 smokeping  3466  0.0 S    smokeping
 3470 smokeping  3470  0.0 S    smokeping
 3484 smokeping  3484  0.0 S    smokeping
 3485 smokeping  3485  0.0 S    smokeping
 3490 smokeping  3490  0.0 S    smokeping
 3497 smokeping  3497  0.0 S    smokeping
 3498 smokeping  3498  0.0 S    smokeping
 3499 smokeping  3499  0.0 S    smokeping
 3500 smokeping  3500  0.0 S    smokeping
 3501 smokeping  3501  0.0 S    smokeping
 3502 smokeping  3502  0.0 S    smokeping
 3503 smokeping  3503  0.0 S    smokeping
21037 smokeping 21037  0.0 S    fping

Note that these processes haven't been running for very long, so they
haven't done very much yet.  (I'll leave you to figure out why I had
to use that format specifier in the ps command line:)

Here are the .rrd files for one part of the local network:

tornado:~# >>> ll /var/lib/smokeping/Local/BluebellClose
-rw-r--r-- 1 smokeping smokeping 2986808 2008-06-20 16:01 BACKUP.rrd
-rw-r--r-- 1 smokeping smokeping 2986808 2008-06-20 16:00 DRAUGHT.rrd
-rw-r--r-- 1 smokeping smokeping 2986808 2008-06-20 16:00 FIREWALL.rrd
-rw-r--r-- 1 smokeping smokeping 1039568 2008-06-20 16:03 HTTP_GET.rrd
-rw-r--r-- 1 smokeping smokeping 2986808 2008-06-20 16:00 LocalMachine.rrd
-rw-r--r-- 1 smokeping smokeping 2986808 2008-06-20 16:00 Portakabin2.rrd
-rw-r--r-- 1 smokeping smokeping 2986808 2008-06-20 16:00 RH90.rrd
-rw-r--r-- 1 smokeping smokeping  779936 2008-06-20 16:02 SSH_TCP_ping.rrd
-rw-r--r-- 1 smokeping smokeping 2986808 2008-06-20 16:00 TWISTER.rrd
-rw-r--r-- 1 smokeping smokeping 2986808 2008-06-20 16:00 VORTEX.rrd
-rw-r--r-- 1 smokeping smokeping 2986808 2008-06-20 16:00 WWW2.rrd

As you can see, the .rrd files are all writeable only by the smokeping
user (and root, of course).  The Apache user is 'www-data'.  The Apache
Webserver (apart from the parent process, which does not serve requests)
can only read them.

--

73,
Ged.