nagios.cmd

[glynn.seymour at bayerbbs.com]

I think your ownership is wrong, my nagios.cmd is owned by nagios.nagcmd 
and the http user is a member of nagcmd (nagios command group I created - 
think this is a default? been  a while since I installed it :-)) - it's 
the http user writing to the pipe, and the nagios user (service) reading 
it. Permissions look consistent with mine (660, prw-rw----). 

Why the file perms changed,

6. Set user ID, set group ID, sticky bit
In addition to the basic permissions discussed above, there are also three 
bits of information defined for files in UNIX:
SUID or setuid: change user ID on execution. If setuid bit is set, when 
the file will be executed by a user, the process will have the same rights 
as the owner of the file being executed. 
SGID or setgid: change group ID on execution. Same as above, but inherits 
rights of the group of the owner of the file. For directories it also may 
mean that when a new file is created in the directory it will inherit the 
group of the directory (and not of the user who created the file). 
Sticky bit. It was used to trigger process to "stick" in memory after it 
is finished, now this usage is obsolete. Currently its use is system 
dependant and it is mostly used to suppress deletion of the files that 
belong to other users in the folder where you have "write" access to. 


I'm guessing this happens first time you attempt to execute, regardless of 
whether your submission succeeds or not - bet somebody can explain it 
properly, I'm rubbish on perms.

<SNIP>####################################
--------------------------------------------------------------------------------------------------------------------- 

 
Now to show you where I run into the actual trouble. I restarted nagios 
and it changed the permissions on the file.
 
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- 

root at maverick:/usr/local/nagios/var/rw# ls -al
total 0
drwxrwsrwx 2 nagios nagios  80 2007-07-03 16:18 . 
drwxrwxrwx 4 nagios nagios 384 2007-07-06 08:40 ..
prwxrwxrwx 1 nagios nagios   0 2007-07-06 08:38 nagios.cmd
root at maverick:/usr/local/nagios/var/rw # /etc/init.d/nagios restart
Running configuration check...done
Stopping nagios: done.
Starting nagios: done.
root at maverick:/usr/local/nagios/var/rw # ls -al
total 0
drwxrwsrwx 2 nagios nagios  80 2007-07-06 08:40 .
drwxrwxrwx 4 nagios nagios 384 2007-07-06 08:40 ..
prw-rw---- 1 nagios nagios   0 2007-07-06 08:40 nagios.cmd
root at maverick:/usr/local/nagios/var/rw#
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- 

 
The file permissions are incorrect and seemingly nagios caused the 
problem. Notice that the new file does not even have the same permissions 
as the file it created before.

<SNIP>###########################################

HTH.
___________________________________________________________________________ 


Glynn Seymour 
Network Consultant 
BBS EMEA RSU 
Bayer plc, UK 


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