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README.Slackware
================
This file contains some basic instructions to get nagios installed and
running on your computer.
0) Before running the SlackBuild Script
---------------------------------------
0.1) Create nagios group & user
Before even running the SlackBuild script, create the necessary 'nagios'
user and group. The SlackBuild script won't run if these do not exist.
The suggested UID and GID is 213, but you can change this as needed:
# groupadd -g 213 nagios
# useradd -u 213 -d /dev/null -s /bin/false -g nagios nagios
0.2) Add 'apache' to 'nagios' group
For several nagios scripts to run without problems, you need to add the
'apache' user to the 'nagios' group, so that it can write to the
/var/nagios/rw directory:
# usermod -G nagios apache
0.3) Select DOCROOT
The standard SlackBuild script puts the nagios files in /var/www/htdocs
This is fine for a stock Slackware installation, but if your 'DOCROOT'
lives in another directory, you can specify it when starting the SlackBuild
script like this:
# DOCROOT=/your/docroot/dir ./nagios.SlackBuild
1) Post-installation
--------------------
After building & installing the nagios package, there are some additional
steps to take.
1.1) Check /etc/nagios/nagios.cfg & /etc/nagios/cgi.cfg
These are the basic configuration files for the nagios server. Do read the
documentation to understand what all the different settings mean.
1.2) Edit /etc/httpd/extra/nagios.conf
To be able to view the documentation, edit this file.
After the "<Directory "/var/www/htdocs/nagios">" line, change:
Options None
to read:
Options FollowSymLinks
1.3) Edit /etc/httpd/httpd.conf
Now you need to add the extra/nagios.conf file as an included file. To
accomplish this, after the "DocumentRoot /srv/httpd/htdocs" line, add:
Include /etc/httpd/extra/nagios.conf
1.4) Create access file
The /etc/httpd/extra/nagios.conf file defines /etc/nagios/htpasswd.users
as the file with the authorized users.
To create this file with a standard user called 'nagiosadmin', type:
# htpasswd -c /etc/nagios/htpasswd.users nagiosadmin
then type the password you choose twice.
To add other users, delete users, etc., check the man page for htpasswd:
# man htpasswd
1.5) Restart httpd
# /etc/rc.d/rc.httpd restart
1.6) Put startup command in /etc/rc.d/rc.local:
# Start nagios:
if [ -x /etc/rc.d/rc.nagios ]; then
echo "Starting nagios..."
/etc/rc.d/rc.nagios start
fi
1.7) Put shutdown command in /etc/rc.d/rc.local_shutdown:
# Stop nagios:
if [ -x /etc/rc.d/rc.nagios ]; then
echo "Stopping nagios..."
/etc/rc.d/rc.nagios stop
fi
1.8) Make /etc/rc.d/rc.nagios executable:
# chmod +x /etc/rc.d/rc.nagios
1.9) Start nagios:
# /etc/rc.d/rc.nagios start
2) Adding hosts, routers, switches, etc.
----------------------------------------
Lot of documentation is included in this package and should be read to fully
understand how to add hosts, routers, switches, etc.
To add functionality, build & install the nagios-plugins on your server.
To monitor external Linux hosts, install the nrpe package on them, together
with the nagios-plugins.
To monitor Windows hosts, install NSClient++ on them.
Do check the http://wiki.nagios.org pages for some useful information.
3) Growing log files
--------------------
If you are monitoring several items, your log files can grow considerably.
Nagios keeps a history of all logs in /var/nagios/archives/.
After a few months this can be quite a bit of information, so consider
creating some kind of clean-up or compacting script (Left as an exercise to
the reader :) )
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