SNMP is the Simple Network Management Protocol

The SNMP protocol is used by network management systems to communicate with network elements.For this to work, the network element must be equipped with an SNMP agent.

Most professional-grade network hardware comes with an SNMP agent built in. These agents must be enabled and configured to communicate with the network management system.Operating systems, such as Unix and Windows, can also be configured with SNMP agents.

Simple Network Management Protocol (SNMP) is a UDP-based network protocol. It is used mostly in network management systems to monitor network-attached devices for conditions that warrant administrative attention.

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What is Network File System (NFS)

Network File System (NFS) is a network file system protocol originally developed by Sun Microsystems in 1984, allowing a user on a client computer  to access files over a network in a manner similar to how local storage is accessed. NFS, like many other protocols, builds on the Open Network Computing Remote Procedure Call (ONC RPC) system. The Network File System is an open standard defined in RFCs, allowing anyone to implement the protocol.

The NFS protocol is designed to be independent of the computer, operating system, network architecture, and transport protocol. This means that systems using the NFS service may be manufactured by different vendors, use different operating systems, and be connected to networks with different architectures. These differences are transparent to the NFS application, and thus, the user.

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How to Start and Stop Nagios Core | Nagios Tutorial

starting-and-stopping-nagios-core
Starting Nagios Core
Init Script: The easiest way to start the Nagios Core daemon is by using the init script like so:
/etc/rc.d/init.d/nagios start
Manually: You can start the Nagios daemon manually with the -d command line option like so:
/usr/local/nagios/bin/nagios -d /usr/local/nagios/etc/nagios.cfg
Restarting Nagios Core
Restarting/reloading is nececessary when you modify your configuration files and want those changes to take effect.
Init Script: The easiest way to restart the Nagios Core daemon is by using the init script like so:
/etc/rc.d/init.d/nagios reload
Web Interface: You can restart the Nagios Core through the web interface by clicking the “Process Info” navigation link and selecting “Restart the Nagios process”:
Manually: You can restart the Nagios Core process by sending it a SIGHUP signal like so:
kill -HUP <nagios_pid>
Stopping Nagios Core
Init Script: The easiest way to stop the Nagios Core daemon is by using the init script like so:
/etc/rc.d/init.d/nagios stop
Web Interface: You can stop the Nagios Core through the web interface by clicking the “Process Info” navigation link and selecting “Shutdown the Nagios process”:
Manually: You can stop the Nagios Core process by sending it a SIGTERM signal like so:
kill <nagios_pid>
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Steps to Start-Stop Nagios XI Server | Nagios XI Tutorial

Steps to Start-Stop Nagios XI Server

How to start and stop Naxios XI Server?

How to stop Naxios XI Server?

service nagiosxi stop

service npcd stop

service ndo2db stop

service nagios stop

service postgresql stop

service mysqld stop

service httpd stop

How to start Naxios XI Server?

service httpd start

service mysqld start

service postgresql start

service nagios start

service ndo2db start

service npcd start

service nagiosxi start

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Step by step procedures to Install Nagios agent in Linux

procedures-to-install-nagio

Step by step procedures to Install Nagios agent in Linux

> cd /tmp

> mkdir software

> cd software

> yum install wget

> wget https://assets.nagios.com/downloads/nagiosxi/agents/linux-nrpe-agent.tar.gz

> tar -zxvf linux-nrpe-agent.tar.gz

> cd linux-nrpe-agent

> ./fullinstall

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Step by step procedures to Install Nagios XI Server in Centos 7

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Step by step procedures to Install Nagios XI Server in Centos 7
#Update your centos os
> yum install update
> yum install wget
# to install network utility e.g. ping. (Optional)
> yum install net-tools
> cd /tmp
> mkdir software
> cd /tmp/software
# Download the Nagios latest package
> wget https://assets.nagios.com/downloads/nagiosxi/5/xi-5.4.3.tar.gz
> tar -zxvf xi-5.4.3.tar.gz
> cd /tmp/software/
> cd nagiosxi/
# Fire the script for intallation and wait for completion message.
> ./fullinstall
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How to Install and Configure Nagios Server and Clients | Nagios Tutorial

install-and-configure-nagios-server-and-clients
Install and Configure Nagios Server and Clients
Download the Nagios Server Source copy from https://www.nagios.com/products/nagios-xi/
You can also use the direct download links as below;
> wget https://assets.nagios.com/downloads/nagiosxi/5/xi-5.2.0.tar.gz
Extract the xi-5.2.0.tar.gz using
> tar -zxvf xi-5.2.0.tar.gz
Run the following commands to install it.
> ./fullinstall
At the end of installation, you will get the url address  using you can access the Nagios server.
e.g http://10.160.34.98/nagiosxi/
Open the url http://10.160.34.98/nagiosxi/
and enter and save following info.
Administrator Name:
Administrator Email Address:
Administrator Username:
Administrator Password:
and presss “Install”
Once you get “Installation Complete” message that means you have Nagios Server install completed.
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