thorko . de
Linux / Unix systems administrator
For it has been granted to you that for the sake of Christ you should not only believe in him but also suffer for his sake....
Last FaqDB entries
Incron Howto
Install incron
~$ apt-get install incron
Configure incron and allow root to create an incrontab
# /etc/incron.conf
system_table_dir = /var/spool/incron/systables
user_table_dir = /var/spool/incron/usertables
allowed_users = /etc/incron.d/allow
denied_users = /etc/incron.d/deny
editor = vim
~$ mkdir -p /var/spool/incron/{systables,usertables}
~$ echo "root" > /etc/incron.d/allow
~$ touch /etc/incron.d/deny
~$ /etc/init.d/incron restartnext create an incrontab
~$ incrontab -e
/home/karl IN_CREATE /opt/scripts/send_mail.sh $# $@
incron can't handle pipes so "/home/tdorn IN_CREATE echo "$# $@" | mail -s "test" test@thorko.de" won't work. Instead use command line parameters to pass it to your script
$@ - name of the watched directory
$# - the filename
$$ - dollar sign
$% - event as text
$& - event as number
Howto configure avg for antivirus mail scanning
If you have avg already installed you can use "avgcfgctl" and "avgctl" to control avg
In your postfix configuration (master.cf) you have to set this
avgtcpd unix - - n - 2 smtp
-o smtp_data_done_timeout=1200
-o smtp_send_xforward_command=yes
-o disable_dns_lookups=yes
-o max_use=20
and in your main.cf file
content_filter = avgtcpd:localhost:54321
make sure avgtcpd is started and listening on port 54321
to configure avg you can export the entire configuration by using
~$ avgcfgctl -f avg.cfg
once you have edited that file you import it by
~$ avgcfgctl -f avg.cfg -w -n
-n will also notify avg about configuration changes
I suggest at least to set
Tcpd.scan.Options.ReportMacros=true
Tcpd.scan.Options.ReportPwdProtectedArchs=true
Tcpd.scan.Options.ReportPwdProtectedDocs=true
Tcpd.scan.Options.ScanMediaFiles=true
Some useful SELinux commands
disable selinux at all
~$ echo 0 > /selinux/enforce
enable it again
~$ echo 1 > /selinux/enforce
when getting permission denied or something
check if auditd is running
~$ ps xa |grep auditd
run audit2allow
~$ audit2allow -l -a -M local
add the rules
~$ semodule -i local.pp
Useful commands
Show when a process got started
~$ ps kstart_time -ef
Howto create custom PNP4Nagios Template
First of all you need to be sure your perfdata comes in format " | <name>=<data>; <name2>=<data>"
Now create a file in your check_commands directory
check_commands/check_nrpe.cfg
CUSTOM_TEMPLATE = 0,1
PNP4Nagios takes the check_command definition of nagios. So "check_command check_nrpe!load!-w 4,4,4 -c 5,5,5" will be split into:
0=check_nrpe
1=load
2=-w...
So if you use CUSTOM_TEMPLATE = 0,1 it searches for a template file called "check_nrpe_load.php". This template file needs to be created under the share/templates directory. You can use the following as an example
<?
$opt[1] = "--title \"Memory consumption $hostname / $servicedesc\" ";
$def[1] = "DEF:Data=$RRDFILE[1]:$DS[1]:AVERAGE " ;
$def[1] .= "DEF:Lib=$RRDFILE[1]:$DS[2]:AVERAGE " ;
$def[1] .= "DEF:RSS=$RRDFILE[1]:$DS[3]:AVERAGE " ;
$def[1] .= "DEF:Exe=$RRDFILE[1]:$DS[4]:AVERAGE " ;
$def[1] .= "DEF:Stk=$RRDFILE[1]:$DS[5]:AVERAGE " ;
$def[1] .= "LINE:Data#80ff40:\"Data used \" " ;
$def[1] .= "GPRINT:Data:LAST:\"%6.0lf MB last\" " ;
$def[1] .= "GPRINT:Data:AVERAGE:\"%6.0lf MB avg\" " ;
$def[1] .= "GPRINT:Data:MAX:\"%6.0lf MB max\\n\" ";
$def[1] .= "LINE:Lib#80aa40:\"Lib used \" " ;
$def[1] .= "GPRINT:Lib:LAST:\"%6.0lf MB last\" " ;
$def[1] .= "GPRINT:Lib:AVERAGE:\"%6.0lf MB avg\" " ;
$def[1] .= "GPRINT:Lib:MAX:\"%6.0lf MB max\\n\" ";
$def[1] .= "LINE:RSS#7b0040:\"RSS used \" " ;
$def[1] .= "GPRINT:RSS:LAST:\"%6.0lf MB last\" " ;
$def[1] .= "GPRINT:RSS:AVERAGE:\"%6.0lf MB avg\" " ;
$def[1] .= "GPRINT:RSS:MAX:\"%6.0lf MB max\\n\" ";
$def[1] .= "LINE:Exe#969640:\"Exe used \" " ;
$def[1] .= "GPRINT:Exe:LAST:\"%6.0lf MB last\" " ;
$def[1] .= "GPRINT:Exe:AVERAGE:\"%6.0lf MB avg\" " ;
$def[1] .= "GPRINT:Exe:MAX:\"%6.0lf MB max\\n\" ";
$def[1] .= "LINE:Stk#80ffcc:\"Stk used \" " ;
$def[1] .= "GPRINT:Stk:LAST:\"%6.0lf MB last\" " ;
$def[1] .= "GPRINT:Stk:AVERAGE:\"%6.0lf MB avg\" " ;
$def[1] .= "GPRINT:Stk:MAX:\"%6.0lf MB max\\n\" ";
?>
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