** DevOps Training: https://www.edureka.co/devops ** In this PPT on Nagios Tutorial, we’ll discuss Continuous Monitoring and the most popular tool used in Continuous Monitoring i.e. Nagios. The following are the topics are covered in this session: Why we need Continuous Monitoring? What is Continuous Monitoring? Continuous Monitoring Tools What is Nagios? Nagios Features Nagios Architecture Nagios Case-Study Demo: Server Monitoring using Nagios Nagios Installation Video: https://goo.gl/3TSXTK Nagios Tutorial Blog: https://goo.gl/Pr3E16 Nagios Interview Questions: https://goo.gl/gq9YzR Check our complete DevOps playlist here (includes all the videos mentioned in the video): http://goo.gl/O2vo13

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Nagios Tutorial
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Agenda
What is DevOps?
DevOps Use Case
DevOps Phases
DevOps Hands-On
Nagios Tutorial

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Nagios Tutorial
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Topics for Today’s Session
2
3
4
5
1 What Is Continuous Monitoring?
Continuous Monitoring Tools
What Is Nagios?
Nagios Case-Study
Demo
www.edureka.co/devopsDevOps Certification Training

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Why We Need Continuous Monitoring?

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Nagios Tutorial
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Why We Need Continuous Monitoring?
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Failure of CI/
CD pipelines
Infrastructure
Issues
Static Code
Analysis
Application
Issues

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Nagios Tutorial
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Why We Need Continuous Monitoring?
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Issues with CI/ CD Pipelines:
• Rapid introduction of performance problems and errors
• Rapid introduction of new endpoints causing monitoring issues
• Lengthy root cause analysis as the number of services expands

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Why We Need Continuous Monitoring?
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Production Like
Environment
Feedback of how application will
perform in production
Taking corrective action
Running APM solutions
earlier in life cycle

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Why We Need Continuous Monitoring?
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Server health cannot be compromised at any cost
Increased response
time

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What Is Continuous Monitoring?

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Nagios Tutorial
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What Is Continuous Monitoring?
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In order for your DevOps strategy to be successful, an effective, comprehensive monitoring approach is essential for visibility into your infrastructure,
applications and business processes. Monitoring the IT system in an ongoing way and in an automated fashion is the crux of CM.

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Continuous Monitoring Phases - NIST
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02
05
Define
Establish
Implement
Analyze
Respond
Review and
Update

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Nagios Tutorial
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Continuous Monitoring Phases - Patriot
Continuous
Discovery
Continuous
Assessment
Continuous
Audit
Continuous
Patching
Continuous
Reporting
01
02
03
04
05

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Continuous Monitoring Tools?

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Nagios Tutorial
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Continuous Monitoring Tools
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Nagios Tutorial
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Continuous Monitoring Tools
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What Is Nagios?

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Nagios Tutorial
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What Is Nagios?
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Nagios monitors your entire IT infrastructure to ensure systems, applications, services, and business processes are functioning
properly.

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Nagios Features
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01
02
03
04 08
07
06
05
Scalable, Manageable
and Secure
Good Log and
Database System
Automatically Sends
Alerts
Detects Network
Errors and Server
Crashes
Easy Writing Plugins
Monitor BP and IT
Infrastructure with a
Single Pass
Issues can be Fixed
Automatically
Support for
implementing
redundant monitoring
hosts

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Nagios Architecture
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• Nagios is built on a server/agents architecture.
• Usually, on a network, a Nagios server is running on a host, and Plugins interact with local and all the remote hosts that need to be monitored.
• These plugins will send information to the Scheduler, which displays that in a GUI.

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Nagios Tutorial
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Monitoring Remote Linux Hosts
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Nagios Case Study

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Nagios Case Study - Bitnetix
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Bitnetix provides outsourced IT management and consulting to non-profits and
small-medium businesses
Beyond keeping the lights on for the store, Bitnetix needed to ensure:
• The cart and checkout functionality was up and running,
• Check for website defamation, and notify the necessary staff if
anything went away.
Bitnetix was tasked with monitoring an online store for an e-commerce
retailer with a billion dollar annual revenue

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Challenge
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Bitnetix hit a roadblock upon realizing that the client’s data center was located in Seacacus, New Jersey, more than 500 miles away
from their staff in Rochester, New York.
DEV
TEST
PROD
The two areas required unique – but
comprehensive – monitoring for the
production, quality assurance, staging, and
development of the same platform.
Monitoring would be hampered by the firewall restrictions
between different application sites, functions, etc

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Challenge
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Bitnetix hit a roadblock upon realizing that the client’s data center was located in Seacacus, New Jersey, more than 500 miles away
from their staff in Rochester, New York.
Most of the notifications sent to the
client were ignored because there
were so many false positives

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Solution
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01
Adding SSH firewall rules for Network
Operations Center (NOC) personnel and
equipment
02Analyzing web pages to check for defamation
occurrences
03 Converting notifications to Nagios alerts and
escalations with specific time periods for
different groups
04Configuring event handlers to restart services
before notification, a fix for 90% of all issues
05
Using Nagios Core (deployed via automatic
configuration management) on multiple servers
at the NOC facility. Each Nagios “worker” was
deployed at the application level with direct
access to hosts.
06Using this architecture for production, quality
assurance, staging, and development
environments

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Result
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A dramatic reduction in
notifications (thanks to the
event handlers’ new
configuration)
A dramatic reduction in false
positives (thanks to Nagios’
escalation logic)
An increase in uptime from around 85% annually
to more than 98% annually, leading to happy and
well-rested SysAdmin and Development teams
(thanks to Nagios fixing problems as they arose)
Estimating the need to log in to multiple boxes
and change configuration files (thanks to Nagios
configurations maintained in a central repository
and pushed automatically to the appropriate
servers)
1
2
3
4

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Demo

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Nagios Tutorial
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Demo
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