I've wrote a script which automatically downloads and installs Nagios NRPE on CentOS machines. The relevant portion of the script is:
read -r -p "How would you like to configure the NRPE daemon? [X]inetd / Standalone [D]aemon " DMN
if [ "DMN" = "x" -o "DMN" = "X" ];
then
DMNMODE="xinetd"
cat << EOF > $XINETDFILE
service nrpe
{
flags = REUSE
type = UNLISTED
port = $NRPEPORT
socket_type = stream
wait = no
user = $NGUSER
group = $NGGROUP
server = /usr/sbin/nrpe
server_args = -c $NRPECFG --inetd
log_on_failure += USERID
disable = no
only_from = 127.0.0.1 $NAGIOSSRV
}
EOF
/etc/init.d/xinetd restart
elif [ "DMN" = "d" -o "DMN" = "D" ];
then
chkconfig nrpe on ; $NRPESVC start
DMNMODE="daemon"
fi
function CheckInstMode {
if [ "DMNMODE" = "daemon" ];
then
$NRPESVC restart
else
$XINETDSVC restart
fi
}
read -r -p "Would you like to pull NRPE plugins from Nagios server? [y/n]" ANS1
if [ $ANS1 = "y" ];
then
if [ $ARCH = "64" -a $NGSARCH = "64" ] ;
then scp root@$NAGIOSSRV:$NGPLUGINS64/* $NGPLUGINS64/
chown -R $NGUSER.$NGGROUP $NGPLUGINS64
CheckInstMode
elif [ "$ARCH" = "64" -a "$NGSARCH" = "32" ] ;
then scp root@$NAGIOSSRV:$NGPLUGINS32/* $NGPLUGINS64/
chown -R $NGUSER.$NGGROUP $NGPLUGINS64
CheckInstMode
elif [ "$ARCH" = "32" -a "$NGSARCH" = "32" ] ;
then scp root@$NAGIOSSRV:$NGPLUGINS32/* $NGPLUGINS32/
chown -R $NGUSER.$NGGROUP $NGPLUGINS32
CheckInstMode
elif [ "$ARCH" = "32" -a "$NGSARCH" = "64" ] ;
then scp root@$NAGIOSSRV:$NGPLUGINS64/* $NGPLUGINS32/
chown -R $NGUSER.$NGGROUP $NGPLUGINS32
CheckInstMode
fi
fi
The idea behind the function is to check which installation mode was chosen and restart /etc/init.d/xinetd if Xinetd was chosen or restart /etc/init.d/nrpe if NRPE was chosen.
I've ran the script in debug mode (sh -x script) and this is the output:
+ case $ARCH in
+ echo 'Configuring /etc/nagios/nrpe.cfg'
Configuring /etc/nagios/nrpe.cfg
+ cat
+ echo 'Adding nagios user to /etc/sudoers'
Adding nagios user to /etc/sudoers
+ echo 'Defaults:nagios !requiretty'
+ echo 'nagios ALL = NOPASSWD:/usr/lib64/nagios/plugins/*'
+ echo 'Setting ownership of nagios and nagios plugins folders to nagios user'
Setting ownership of nagios and nagios plugins folders to nagios user
+ chown -R nagios.nagios /etc/nagios
+ chown -R nagios.nagios /usr/lib64/nagios/plugins
+ read -r -p 'How would you like to configure the NRPE daemon? [X]inetd / Standalone [D]aemon ' DMN
How would you like to configure the NRPE daemon? [X]inetd / Standalone [D]aemon x
+ '[' DMN = x -o DMN = X ']'
+ '[' DMN = d -o DMN = D ']'
+ read -r -p 'Would you like to pull NRPE plugins from Nagios server? [y/n]' ANS1
Would you like to pull NRPE plugins from Nagios server? [y/n]y
+ '[' y = y ']'
+ '[' 64 = 64 -a 64 = 64 ']'
+ scp 'root@IP:/usr/lib64/nagios/plugins/*' /usr/lib64/nagios/plugins/
1 100% 71 0.1KB/s 00:00
Back-check_services.pl 100% 2485 2.4KB/s 00:00
cacticpu.sh 100% 189 0.2KB/s 00:00
check_apt 100% 99KB 99.4KB/s 00:00
check_breeze 100% 2253 2.2KB/s 00:00
check_by_ssh 100% 41KB 40.6KB/s 00:00
check_clamd 100% 46KB 46.5KB/s 00:00
+ chown -R nagios.nagios /usr/lib64/nagios/plugins
+ CheckInstMode
+ '[' DMNMODE = daemon ']'
+ /etc/init.d/nrpe restart
Shutting down nrpe: [ OK ]
Starting nrpe: [ OK ]
+ stat --format=%Y /etc/passwd
+ chmod +x /usr/local/share/applications/file
+ read -r -p 'Would you like to test NRPE? [y/n]' ANS2
Would you like to test NRPE? [y/n]
As you can see the DMNMODE variable which is expected to be xinetd is daemon instead, even though my input for the question of xinetd or daemon was "x".
This causes the script to restart nrpe even if xinetd was selected, can you please tell me what I'm doing wrong?
Edit #1:
I still get an unexpected result from variable $DMNMODE, Here's the debug run:
How would you like to configure the NRPE daemon? [X]inetd / Standalone [D]aemon x
+ [[ x = [Xx] ]]
+ DMNMODE=xinetd
+ cat
+ /etc/init.d/xinetd restart
Stopping xinetd: [ OK ]
Starting xinetd: [ OK ]
+ read -r -p 'Would you like to pull NRPE plugins from Nagios server? [y/n]' ANS1
Would you like to pull NRPE plugins from Nagios server? [y/n]y
+ '[' y = y ']'
+ '[' 64 = 64 -a 64 = 64 ']'
+ scp 'root@IP:/usr/lib64/nagios/plugins/*' /usr/lib64/nagios/plugins/
1 100% 71 0.1KB/s 00:00
Back-check_services.pl 100% 2485 2.4KB/s 00:00
cacticpu.sh 100% 189 0.2KB/s 00:00
check_apt 100% 99KB 99.4KB/s 00:00
negate 100% 30KB 29.7KB/s 00:00
plugins.pm 100% 1939 1.9KB/s 00:00
+ chown -R nagios.nagios /usr/lib64/nagios/plugins
+ CheckInstMode
+ '[' xinetd = daemon ']'
+ /etc/init.d/nrpe restart
Shutting down nrpe: [ OK ]
Starting nrpe: [ OK ]
+ stat --format=%Y /etc/passwd
+ chmod +x /usr/local/share/applications/file
+ read -r -p 'Would you like to test NRPE? [y/n]' ANS2
My question is... Why does the function return the wrong value? if you scroll up you can see that I typed X in the question which means that DMNMODE variable is set to xinetd and not nrpe... can you try and find the problem please?
Your help is much appreciated! Itai
The $DMN variable references are missing $ signs.
if [ "$DMN" = "x" -o "$DMN" = "X" ];