This HowTo discusses installation of Nagios on CENTOS 5.3
Author:Badi Ul Zaman (bnhashmi at wbitt dot com)
Step # 1 Checking for Prerequisites.
yum list installed | egrep ‘httpd|gcc|glibc|glibc-common|gd|gd-devel’
compat-gcc-34.i386 3.4.6-4 installed
compat-gcc-34-c++.i386 3.4.6-4 installed
compat-gcc-34-g77.i386 3.4.6-4 installed
compat-glibc.i386 1:2.3.4-2.26 installed
compat-glibc-headers.i386 1:2.3.4-2.26 installed
compat-libgcc-296.i386 2.96-138 installed
gcc.i386 4.1.2-44.el5 installed
gcc-c++.i386 4.1.2-44.el5 installed
gcc-gfortran.i386 4.1.2-44.el5 installed
gcc-gnat.i386 4.1.2-44.el5 installed
gcc-java.i386 4.1.2-44.el5 installed
gcc-objc.i386 4.1.2-44.el5 installed
gd.i386 2.0.33-9.4.el5_1.1 installed
gd-devel.i386 2.0.33-9.4.el5_1.1 installed
gdb.i386 6.8-27.el5 installed
gdbm.i386 1.8.0-26.2.1 installed
gdbm-devel.i386 1.8.0-26.2.1 installed
gdk-pixbuf.i386 1:0.22.0-25.el5 installed
gdm.i386 1:2.16.0-47.el5.centos installed
glibc.i686 2.5-34 installed
glibc-common.i386 2.5-34 installed
glibc-devel.i386 2.5-34 installed
glibc-headers.i386 2.5-34 installed
httpd.i386 2.2.3-22.el5.centos installed
libgcc.i386 4.1.2-44.el5 installed
sysklogd.i386 1.4.1-44.el5 installed
Above output shows that required packages are installed on system. In the case the are not installed you can install them using your CentOS 5.3 DVD. If you want to install from CentOS 5.3 DVD you need to enable CentOS-Media.repo
Enabling CentOS-Media.repo
vim /etc/yum.repos.d/CentOS-Media.repo
# CentOS-Media.repo
#
# This repo is used to mount the default locations for a CDROM / DVD on
# CentOS-5. You can use this repo and yum to install items directly off the
# DVD ISO that we release.
#
# To use this repo, put in your DVD and use it with the other repos too:
# yum –enablerepo=c5-media [command]
#
# or for ONLY the media repo, do this:
#
# yum –disablerepo=\* –enablerepo=c5-media [command]
[c5-media]
name=CentOS-$releasever – Media
baseurl=file:///media/dvd/
file:///media/CentOS/
file:///media/cdrom/
file:///media/cdrecorder/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5
Step # 2 Installing Prerequisites.
yum –disablerepo=\* –enablerepo=c5-media -y install httpd gcc glibc glibc-common gd gd-devel
Step # 3 Creating Users/Groups needed.
groupadd nagcmd
useradd -G nagcmd,apache nagios
id nagios
passwd nagios
Step # 4 Downloading Nagios & Plugins
mkdir /downloads
cd /downloads
wget -c http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-3.1.2.tar.gz
wget -c http://prdownloads.sourceforge.net/sourceforge/nagiosplug/nagios-plugins-1.4.13.tar.gz
Step # 5 Extracting Nagios tar ball.
tar zxvf nagios-3.1.2.tar.gz
cd nagios-3.1.2
Step # 6 running ./configure script.
./configure –with-command-group=nagcmd
Step # 7 compiling the source code.
make all
Step # 8 Installing Nagios binaries.
make install
Step # 9 Installing init script.
make install-init
Step # 10 Installing sample config files.
make install-config
Step # 11 setting permissions on the external command directory.
make install-commandmode
Step # 12 Updating contacts/groups information in contacts.cfg file.
vim /usr/local/nagios/etc/objects/contacts.cfg
change email address of nagiosadmin user line 35 according to your requirements.
Step # 13 Installing web configuration.
make install-webconf
Step # 14 creating nagiosadmin user and setting password for web-interface.
htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
Step # 15 Configuring, Restarting Apache Service and Adding to runlevel 35 .
vim /etc/httpd/conf/httpd.conf
go to line 391 and add index.php
chkconfig –level 35 httpd on
service httpd restart
Step # 16 Compiling and installing Nagios plugins.
cd /downloads/
tar zxvf nagios-plugins-1.4.13.tar.gz
cd nagios-plugins-1.4.13
./configure –with-nagios-user=nagios –with-nagios-group=nagios
make
make install
Step # 17 Verifying, restarting nagios service and Adding to runlevel 35 .
/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
chkconfig –level 35 nagios on
Changing nagios user home directory to /usr/local/nagios
usermod -d /usr/local/nagios/ nagios
service nagios restart
ps aux | grep nagios
Step # 18 Modifying SeLinux Setting for Nagios
chcon -R -t httpd_sys_content_t /usr/local/nagios/sbin/
chcon -R -t httpd_sys_content_t /usr/local/nagios/share/
Step # 19 Login to Web-Interface.
Http://localhost/nagios
Step # 20 Check for Nagios Logs
tail -f /usr/local/nagios/var/nagios.log
Now we are done with Nagios Installation Part-I Alhamdulillah.
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