Nagios Client Installation

1.	Update security group to allow 5666, ICMP request and SSH protocols from nagios server 34.193.101.102/32

2.	Run below commands to install Nagios client

mkdir /opt/Nagios
cd /opt/nagios/
wget https://assets.nagios.com/downloads/nagiosxi/agents/linux-nrpe-agent.tar.gz
tar xvf linux-nrpe-agent.tar.gz
cd linux-nrpe-agent 
./fullinstall
echo "nrpe: 34.193.101.102" >> /etc/hosts.allow


aws s3 cp s3://jbsm-installers/check_cpu_usage.sh /usr/local/nagios/libexec/check_cpu
chmod +x /usr/local/nagios/libexec/check_cpu
chown nagios:nagios /usr/local/nagios/libexec/check_cpu

3.	vi /usr/local/nagios/etc/nrpe.cfg

Append below lines to nrpe.cfg at the end of file

command[check_cpu]=/usr/local/nagios/libexec/check_cpu -w 75 -c 85
command[check_root_disk]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /
command[check_total_procs]=/usr/local/nagios/libexec/check_procs -w 150 -c 200
command[check_zombie_procs]=/usr/local/nagios/libexec/check_procs -w 5 -c 10 -s Z
command[check_nginx]=/usr/local/nagios/libexec/check_procs -c 1: -C nginx -u root -a 'master process'
command[check_tomcat]=/usr/local/nagios/libexec/check_procs -c 1: -u tomcat -a 'org.apache.catalina.startup.Bootstrap start'

4.	service xinetd restart