#Nagios mentors

[nareshtech]

Is DevOps A Good Career?

DevOps professionals are among the highest-paid people in IT, and it’s the most demanding technical job to do. DevOps is known as movement, tools, and method. Others argue that “DevOps” in one position is counterproductive for its goals. DevOps provides automation of software delivery, as well as infrastructure updates, to involve specific tools and services. But more importantly, DevOps aims to transform the way parts of a software organization work together, staying between development, QA and operations, and applying a combination of automation tools By combining traditional silos with automation and collaboration, the organization can collaborate to create, test, and release updates quickly and reliably.

Software products and infrastructure updates can be released with much less risk and uncertainty, making the organization more sensitive to customers. Many DevOps professionals started as system administrator system programmers or multilingual programmers, with some experience in infrastructure management. The common thread is the ability to alternate between development, testing, and system administration. You can quickly get started in DevOps as a developer, system administrator, DBA, QA or anywhere else, as long as you want to learn new tools and technologies and be fully involved in what other teams in your organization are doing. A DevOps career requires curiosity and willingness to train outside the comfort zone and assumptions of your current role. Being a successful bridge between teams requires a general understanding of the business. The broad (rather than in-depth) approach will help you gain practical experience in different roles and environments. You will continuously learn new technologies and skills that can be applied elsewhere, so DevOps will keep you from concentrating on a path.

Roles and responsibilities of DevOps

The DevOps philosophy is evolving rapidly, and new missions, roles, and responsibilities are emerging. An interesting fact is that although companies list these roles separately, there are many overlaps in the responsibilities, tasks, and skills required. Most companies currently have the list of locations shown below for DevOps engineers

DevOps Architect

A DevOps architect is responsible for analyzing and executing DevOps practices in the organization or a team. Design the overall DevOps environment, bringing all effective DevOps methodologies in line with industry standards. It provides the right tools for automating processes. DevOps Architect also sets up a continuous build environment to accelerate software development, testing, and the production deployment process. In some organizations, a DevOps architect acts as a team mentor, guiding developers and operational teams to solve problems. Monitor, analyze, and manage technical operations from a leadership perspective.

Responsible for publication

In a DevOps environment, a version manager is responsible for planning, planning, monitoring, and controlling the software development and distribution process. Develop the development team and operations team to synchronize, allowing for frequent but short feedback loops. A version manager is responsible for defining the criteria for passing and accepting the current version of the software. Use the CI / CD pipeline efficiently and neglect to build quality standards. In the DevOps culture, a version manager is more people-centred and tries to minimize the impact on the user. This means that in the DevOps culture, a launch manager covers specific project manager roles.

Read More: Top 10 best technologies to learn in 2020

 Security engineer

In DevOps, global security is commonly referred to as DevSecOps. Responsibilities include the use of various tools, such as log management and configuration management, to ensure security.

In the traditional lifecycle of cascading software development, security is primarily applied only when the code is put into production. But in the DevOps culture, security is a critical factor in all ongoing DevOps cycles.

Automation engineer

In the DevOps world, an automation engineer is responsible for developing and maintaining the CI / CD process for all applications and their builds using tools such as Maven, Jenkins, infrastructure and platforms that use configuration management tools such as Ansible, Chef, Puppet, Salt Stack, Fabric, etc. He is also responsible for creating and managing virtual machines and containers using tools such as Vagrant, Docker, and Kubernetes. The automation engineer also performs recording and monitoring activities using tools such as Nagios, Zabbix, ELK stack, and Splunk.

Enroll now for: DevOps Online Training

[workfromhomeyoutuber]

Percona: Database Engineer (MySQL)

Headquarters: Durham, North Carolina URL: http://www.percona.com

VOTED TOP 10 BEST REMOTE COMPANY TO WORK FOR What's the Job?

Percona Support is a global, elite team of super hero engineers who love getting to the bottom of weird and interesting database behavior. We understand our customers’ business needs and the nuances of their technical environments. This allows us to help our customers see the big picture and identify opportunities to improve their overall database infrastructures. 

This is not a boring, entry-level role where you’ll just be triaging the boring and monotonous.

You’ll be teaming with some of the most well known database ninjas in the industry who are even better teammates, friends and mentors. You’ll have the opportunity to develop your own skills and become more powerful than you can possibly imagine…. with databases. Location: Remote, work from home position anywhere within Americas or Asia Pacific region. 5 day work week (supporting US time zones) including weekend.  Participation with the on-call team schedule. 

What does it take to be a Percona Superhero?

Exceptional knowledge of both MySQL and InnoDB

Be a wizard with databases and associated technical configurations

Knowledgeable about performance tuning, query optimization, & index tuning

Experience with backup solutions such as XtraBackup, & MyDumper

Experience with HA solutions such as MHA

Detailed understanding of monitoring requirements

Demonstrable experience of administering Linux based systems

Ability to troubleshoot methodically, identifying and applying fixes for known errors, and when necessary, capacity to think outside of the box to resolve complex issues

Enthused to expand your skillset with new technologies as the industry continues to evolve

Availability to travel for the occasional team meeting, conference and customer visit

Excellent written and spoken English and ability to work effectively with English-speaking customers

It's a bonus if you have experience with these:

Galera / XtraDB Cluster, & HAProxy

Cloud Services such as AWS and RDS or hosting providers like Rackspace

Nagios, Percona Monitoring Plugins (PMM) and other monitoring tools

Configuration management solutions such as Ansible, Puppet or Chef

Percona Toolkit suite

MySQL DBA Professional Certifications

MongoDB

PostgreSQL

 MyRocks 

Kubernetes / OpenShift / Docker 

To apply: https://jobs.lever.co/percona/7fcc072e-6aef-4eca-bbe4-e78f625ad625?lever-origin=applied&lever-source%5B%5D=weworkremotely.com

from We Work Remotely: Remote jobs in design, programming, marketing and more https://ift.tt/2Uu4NvW from Work From Home YouTuber Job Board Blog https://ift.tt/3bpY7WE

[siva3155]

300+ TOP NAGIOS Interview Questions and Answers

NAGIOS Interview Questions for freshers experienced :-

1. What is Nagios? Nagios commonly known as the Nagios core is the open-source software that is designed to monitor networks, systems, applications, and infrastructures. The software directly sends the track down all the changes in the subject and send alerts if necessary. 2. How Nagios help DevOps professionals? Nagios was designed in the first place to monitor applications, networks, and infrastructures. The software automatically keeps an eagle eye and immediately report in case of failure. The quick response helps the DevOps professional to track down and resolve the problem in the early stages before it can cause any serious damage to the organization. 3. What makes Nagios an ideal tool for continuous monitoring? The below features of the Nagios is what makes it an ideal tool for continuous monitoring: Automatic problem fixing Infrastructure upgrades Business process and infrastructure monitoring Quick respond to the system issues 4. Write down some of the names of the Nagios monitoring tool for Linux mentoring? When you are using the Nagios to monitor the Linux environment then you need to understand that you are using one of the best tools on the planet. The complete package of Nagios includes service state, file system usage, system metrics, process state, and more. 5. How Icinga is related to the Nagios? Icinga is also open-source software that is used to monitor the networks and application. The core objective of designing Icinga in the first place to lift up the Nagios back in 2009. But it works as a separate monitor software. 6. Describe the active and passive check in Nagios In the Nagios, an active check is leveraged to “poll” a service or device for the status information every once in a while. Nagios basically supports the way to host down the devices and services passively. The key feature of the passive check is it can only be performed by the external applications. 7. Explain OID Nagios? Simple Network Management Protocol (SNMP)- a network protocol which is also designed for the monitoring purpose uses the Object Identifiers to define the Management Information Base. 8. Can you use Nagios to monitor the window machine? Yes, you can use Nagios to monitor the window machine. However, if you are doing it for the first time then you have to follow the given steps: Set the Nagios to monitor the window system Add a separate host and server for the window monitoring 9. Describe the Nagios XI? On the current basis, Nagios XI is one of the most powerful monitoring software in the market. when it comes to monitoring critical infrastructures such as network protocols, applications, services, systems metrics, and network protocols experts only relies upon the Nagios XI. 10. Highlights the benefits of using Nagios for monitoring? There are various benefits of using Nagios software for critical monitoring. The list of benefits includes: Infrastructure updates before the outdated system cause any sort of failure Automatic tracking and troubleshooting of problem Coordinate responses Continuously Monitor infrastructure without any break Response to issues on an immediate basis

NAGIOS Interview Questions 11. what active check means? Active check is the globally recognized way to monitor the hosts and services. Both Nagios XI and Nagios core use it on the pre-determined schedule. 12. Describe the Nagios Network Analyzer? A network analyzer is a crucial aspect of the Nagios software that allows it to deeply scan the entire system in a search of any potential threat. The quick and reliable scan allow system admin to gather necessary data regarding the health of the system and granular data through network analysis. 13. Highlight the primary benefits of monitoring the websites with Nagios? The key benefits of monitoring websites with Nagios are given below: It enhances the website availability Increase website performance Quick detection of online threats such as bugs and hijacking 14. Name down some databases that support Nagios monitoring? There are a number of databases that support Nagios and some of them are mentioned below: Oracle MySQL Microsoft SQL software Postgres 15. Write down the protocols that support Nagios Nagios supports the number of protocols monitoring including; SMTP Monitoring, IPMI Monitoring, FTP Monitoring, LDAP Monitoring, POP Monitoring, and DNS monitoring. 16. what do you understand by the fact that Nagios is object-oriented? As already mentioned above, Nagios is open-source object-oriented monitoring software. Here the term “object-oriented” means that users can create the object definitions in the Nagios that inheritance from other objects. This essential feature of the Nagios further simplifies the complex relationship between components. 17. Can I use Nagios for both cloud computing and cloud monitoring? Yes, the Nagios has a reputation as one of the best monitoring software in the market and you can use it for various monitoring purposes including both virtual and physical. 18. state the name of any four virtualization platforms that supports Nagios? VMware, Amazon EC2, Xen and Microsoft Virtual PC are some of the most common examples of the virtualization platforms that support the Nagios monitoring. 19. Do you know the port numbers Nagios use to monitor its clients? Yes, the Nagios uses port number; 5666, 5667 and 5668 to monitor its clients. 20. Describe the process to verify the Nagios configuration? If you want to configure the Nagios, then you have to run it with the -v command line with option like: nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg. 21. Define the objects in Nagios? In the Nagios, objects refer to all the elements that are involved in the entire monitoring and alerting logic. 22. What are the types of objects you can witness in Nagios? The types of objects you can witness in the Nagios includes; Services, Hosts, commands, host groups, contact, time periods, and notification escalations. 23. How can you use plugin X in Nagios? Just like any other plugin, you have to download plugin X from the official website of Nagios which is https://exchange.nagios.org/. Once downloaded, you can run it manually to see if it is working correctly. 24. When it comes to monetary terms what is the main difference between Nagios Core and Nagios XI? Well, when it comes to monetary terms, Nagios Core is the free open source version while Nagios XI is the paid version limited to the individual who held the license. 25. What is the current Nagios state type? On the current basis, the monitoring host and services are determined by the two major components First: Status of the host and service Second: Types of the state the host or service is in 26. What are the two main state types in Nagios? The Nagios have two key state types; soft states and hard states. 27. Define NRPRE in Nagios? The term NRPE stands for the Nagios Remote Plugin Executor addon which is specifically designed by the experts to execute Nagios plugins on the Linux machines. 28. What database format Nagios support to store status data? RRD is the database format Nagios support and uses to store the status data. 29. Write down the components of NDO Utilities? The NDO utilities are the right mixture of the: NDOMOD Event Broker Module FILE2SOCK Utility LOG2NDO Utility NDO2DB Daemon 30. Can we monitor the operating system through Nagios? Yes, you can monitor any operation system through Nagios as long as it supports the software. NAGIOS Questions and Answers Pdf Download Read the full article

[iteducationcentre-blog]

DevOps Training in Pune

DevOps is a lot of designing practices which helps in computerizing the procedures inside programming advancement groups. DevOps can likewise be characterized as the mix of different devices and practices which are joined to build an association's product conveyance rate. DevOps involves CAMS which represents Culture, Automation, Measurement, and Sharing. In less difficult terms, we can say DevOps go about as a scaffold among innovation and people fixing the hole. Our DevOps Training course in Pune. Notwithstanding the above mentioned, the DevOps preparing affirmation course likewise covers the specialized and business advantages of utilizing DevOps in programming groups.

Devops Training in Pune or anyplace else so far as that is concerned can help your IT learning in an unfathomable manner. Truly, there are various DevOps Training Institutes in Pune, With shorter improvement cycles, decreased arrangement disappointments, rollbacks, diminished expenses, and quicker advancement, the majority of the organizations are embracing to DevOps. The vocation openings in DevOps are extraordinary and will undoubtedly build taking a gander at the present market situation. The strong pay rates to DevOps Engineers are only the Icing on Cake.

Why DevOps

DevOps has changed the IT business by breaking the storehouses that tormented the conventional structures and philosophies. Bringing together programming improvement and programming tasks, it instills the ideas of computerization and observing at all the phases of programming advancement prompting deftness with littler advancement cycles, expanded recurrence of conveying, and exceedingly stable programming discharges that are in a state of harmony with the business objectives.

DevOps is the association of people, technique, and product to change the persistent conveyance imperative to complete clients. It plans to frame culture and environment wherever building, testing, and the cathartic bundle will happen quickly, regularly, and a great deal of trustworthy, in this manner you'll pioneer kind of a start-up and scale for the endeavor. By taking this early on DevOps course, you'll have the capacity to diagram DevOps, see why you wish DevOps, and get familiar with the manner in which you'll begin with DevOps. You'll get familiar with the key thoughts and procedures to convey advancement and tasks along to supply higher-quality bundle and convey it a ton of rapidly.

Both web-local associations and enormous endeavors are receiving DevOps energetically, nowadays. Be that as it may, many individuals don't have the foggiest idea what DevOps really is. Is it a logic, a methodology, an upset, culture or the zenith of these things? Or on the other hand, is it basically that it doesn't have a particular definition and diverse individuals comprehend it in an unexpected way?

All things considered, we will attempt to comprehend that here. Patrick Debois begat the term 'DevOps' in the year 2009. He additionally turned into a DevOps master. The term DevOps is really an amalgamation of two words, one being 'advancement' and different 'activities'. This is the place you can begin understanding the significance of this idea. In all actuality, DevOps is neither a standard nor an innovation. It is additionally not a procedure. It's essentially a 'culture'- a work culture, to be exact. Innovation is utilized for the execution of DevOps. The most widely recognized innovation utilized is computerization apparatuses that could help influence a framework that is both programmable and dynamic when seen from an actual existence cycle point of view.

Before the idea of DevOps emerged, the designer people were constantly centered around pushing programming into the framework quicker. All things considered, that is the thing that they should do. Then again, activities specialists realized that quick changes without important shields could make the framework less steady. This was certainly a difficulty which got dealt with after the idea of DevOps appeared.

Along these lines, DevOps goes for incorporating individuals from the zone of programming advancement and organization into a mechanized work process in such a way, that all offer a typical core interest. Devops, be that as it may, is certifiably not another idea. It emerged long back and got sustained by amazingly forward IT specialists from various fields.

DevOps can enable you to assemble a fortunate vocation. We have relentlessly been putting in endeavors to pinpoint the potential outcomes of DevOps in the IT world. Also, that is likely the motivation behind why we have had the capacity to gain a decent name for ourselves in the market. We are an accomplished establishment with a ton of want to see our understudies scale incredible statures in its field. What's more, we investigate every possibility to ensure our understudies get prepared such that they can convey name and popularity to themselves and their families as well as us.

We gloat of probably the most experienced and learned mentors in Pune, having an extraordinary capability in hypotheses and huge experimental information. Also, think about what, they train understudies by applying an understudy driven methodology of educating. Accordingly, they have dependably been effective in guaranteeing acceptable learning results in students.

Be The Next Devops – CourseOverview

DevOps is the fastest developing field of IT that is quickly crossing over any barrier between bundle Development and Operations. DevOps has become the dominant focal point inside the bundle improvement field and has turned into a critical part for programming fuelled associations

The DevOps Agile Skills Association (DASA) capability system distinguishes aptitudes that are significant in DevOps Programming, Test detail, Business examination, Business esteem improvement, Architecture Design, Infrastructure Engineering, Security, chance consistency.

Experience the Difference Course Overview

• Introduction to DevOps

• Introduction to Cloud processing

• Introduction to Virtualization

• GIT: Version Control

• VAGRANT

• Chef for configuration the board

• Puppet for configuration the executives

• Nagios: Monitoring

• Jenkins – Continuous Integration

• Docker-Containers

DevOps Course Objective

In the wake of finishing this course, understudies are relied upon to have the capacity to

Understand the idea of DevOps and the requirement for DevOps.

Understand distributed computing and virtualization.

Learn and Manager Version control with GIT.

Create and arrange lightweight, reproducible, and versatile improvement situations with Vagrant.

Perform Configuration the executives utilizing Puppet.

Implement ceaseless integration(CI) with Jenkins.

Implement foundation observing with Nagios.

Understand holders utilizing Docker.

Perform Configuration the executives utilizing Chef.

Get hands-on training on all the significant parts canvassed in this course

Why IT Education Center

• Designed to guarantee you breeze through your confirmation tests on the primary endeavor.

• Tie-Ups with Famous and Old Training Institutes in Pune for Certification and Placement process

• Tie-ups with Approx 62 MNCs (as yet associating) to give certified Placement After the Course Completion

• Follows Beginners to Advance Module to Teach and experience every single theme under Course Syllabus

• All-time Working Professional from Hinjewadi and other IT Parks to Teach you in Live Environments in the Respective Institutes

• IT Education focus is one of the Renowned accreditation preparing suppliers in Pune, Having on the web records of 20,000 experts prepared and set in Pune and other Major Cities of Maharashtra

To get enrolled or to know more about your batch schedule and timings, give us a call on +91 8668200049 or visit our site: https://iteducationcentre.com/devops-training-classes-in-pune

[componentplanet]

Make A Living Keeping Hackers Out Of Networks With This Cyber Security Training

Within days of social distancing becoming a household term virtually overnight, we may already have been introduced to another soon-to-be common phrase: Zoom bombing.

With virtual meeting needs at an obvious high, and with video conferencing leader Zoom attracting loads of new usage, enterprising hackers have taken to Zoom bombing, digitally breaking into and causing havoc in live Zoom meetings.

It spotlights vulnerabilities in Zoom’s data architecture, which, unfortunately, doesn’t make them unique. In fact, a cyberattack incident costs companies of all sizes an average of about $200,000 in losses, with about 60 percent shutting down for good within six months as a result.

It’s never been more vital to understand what it takes to build a strong network, maintain tight security and diffuse points of attack. The Network, Security & Ethical Hacking: The Ultimate Cybersecurity Certification Bundle ($39.99, over 90 percent off) breaks down all of those critical areas.

With nine courses covering more than 28 hours of instruction, students get an immersive look at the requirements of 2020 cybersecurity from all angles.

Training begins with The Ethical Hacking Master Class, as expert mentor Sunil Kumar Gupta unpacks everything it takes to spot, exploit and repair vulnerabilities in remote servers and networked machines. After working with Kali Linux advanced penetration tools, students learn how to identify security fail points and take full control of a vulnerable system.

It only gets more intense from there, with How Hackers Find SQL Injections in Minutes with Sqlmap outlining how black hat intruders can interfere with database operations and methods to stop them.

For those looking for a career in ethical hacking, How Web Hackers Make Big Money: Remote Code Execution helps students spot severe RCE vulnerabilities that can leave an entire network open to attack and complete enslavement. Meanwhile, Double Your Web Hacking Rewards with Fuzzing explains how you can use this vulnerability detection technique to get more lucrative rewards from bug bounty programs.

Of course, networking is at the heart of any data system, so the CCNP Routing and Switching ROUTE300-101 course not only explains the fundamentals of routers, switches and types of network architecture but also enough information to pass Cisco’s coveted CCNP Route Exam as proof of your mastery.

Now, getting two nodes of a network to actually communicate with each other is critical. An Introduction of C++ Sockets and Parsing TCP Socket Data with C/C++, the C++ programming language is featured as well as how to parse and handle TCP data and how to minimize problems in developing such networks.

You’ll also learn how to keep an eye on all of it with Setting up Nagios 4 Monitoring, as students understand how to connect a Nagios server to monitor and report problems for both Linux and Windows servers.

Finally, Practical Blockchain and Smart Contracts: Ethereum and Solidity breaks down the industry reshaping practice of blockchaining, a process of networking computers and creating shared databases while still maintaining optimal security.

This comprehensive networking and security training is available now for only $39.99, less than $5 per course.

Note: Terms and conditions apply. See the relevant retail sites for more information. For more great deals, go to our partners at TechBargains.com.

Now read:

ET Dell Gaming And Business PC Deals: G5 Gaming Desktop Only $800, Vostro 14 5490 Laptop Just $609, $479 Off Alienware Aurora R9

In Just 48 Hours, You Could Be A Certified Google Analytics Expert

ET Weekend Deals: $300 Off MacBook Pro, Apple Watch Series 5 Only $349, 30 Percent Off New Fitbit Charge 4

from ExtremeTechExtremeTech https://www.extremetech.com/deals/309230-make-a-living-keeping-hackers-out-of-networks-with-this-cyber-security-training from Blogger http://componentplanet.blogspot.com/2020/04/make-living-keeping-hackers-out-of.html

[kracekumar]

Notes from Root Conf Day 1 - 2017

Root Conf is a conference on DevOps and Cloud Infrastructure. 2017 edition’s theme is service reliability. Following is my notes from Day 1.

State of the open source monitoring landscape

The speaker of the session is the co-founder of Icinga monitoring system. I missed first ten minutes of the talk. -The talk is a comparison of all available OSS options for monitoring, visualization.

Auto-discovery is hard.

As per 2015 monitoring tool usage survey, Nagios is widely used.

Nagios is reliable and stable.

Icinga 2 is a fork of Nagios, rewrite in c++. It’s modern, web 2.0 with APIs, extensions and multiple backends.

Sensu has limited features on OSS side and a lot of features on enterprise version. OSS version isn't useful much.

Zabbix is full featured, out of box monitoring system written in C. It provides logging and graphing features. Scaling is hard since all writes are written to single Postgres DB.

Riemann is stream processor and written in Clojure. The DSL stream processing language needs knowledge of Clojure. The system is stateless.

OpenNMS is a network monitoring tool written in Java and good for auto discovery. Using plugins for a non-Java environment is slow.

Graphite is flexible, a popular monitoring tool for time series database.

Prometheus is flexible rule-based alerting and time series database metrics.

Elastic comes with Elastic search, log stash, and kibana. It’s picking up a lot of traction. Elastic Stack is extensible using X-PACK feature.

Grafana is best for visualizing time series database. Easy to get started and combine multiple backends. - - Grafana annotations easy to use and tag the events.

There is no one tool which fits everyone's case. You have to start somewhere. So pick up a monitoring tool, see if it works for you else try the next one til you settle down.

Deployment strategies with Kubernetes

This was talk with a live demo.

Canary deployment: Route a small amount of traffic to a new host to test functioning.

If new hosts don't act normal roll back the deployment.

Blue Green Deployment is a procedure to minimize the downtime of the deployment. The idea is to have two set of machines with identical configuration but one with the latest code, rev 2 and other with rev 1. Once the machines with latest code act correctly, spin down the machines with rev 1 code.

Then a demo of kubectl with adding a new host to the cluster and roll back.

A little bot for big cause

The talk is on a story on developing, push to GitHub, merge and release. And shit hits the fan. Now, what to do?

The problem is developer didn’t get the code reviewed.

How can automation help here?

Enforcing standard like I unreviewed merge is reverted using GitHub API, Slack Bot, Hubot.

As soon as developer opens a PR, alice, the bot adds a comment to the PR with the checklist. When the code is merged, bot verifies the checklist, if items are unchecked, the bot reverts the merge.

The bot can do more work. DM the bot in the slack to issue commands and bot can interact with Jenkins to roll back the deployed code.

The bot can receive commands via slack personal message.

Necessary tooling and monitoring for performance critical applications

The talk is about collecting metrics for German E-commerce company Otto.

The company receives two orders/sec, million visitors per day. On an average, it takes eight clicks/pages to complete an order.

Monitor database, response time, throughput, requests/second, and measure state of the system

Metrics everywhere! We talk about metrics to decide and diagnose the problem.

Metrics is a Clojure library to measure and record the data to the external system.

The library offers various features like Counter, gauges, meters, timers, histogram percentile.

Rather than extracting data from the log file, measure details from the code and write to the data store.

Third party libraries are available for visualization.

The demo used d3.js application for annotation and visualization. In-house solution.

While measuring the metrics, measure from all possible places and store separately. If the web application makes a call to the recommendation engine, collect the metrics from the web application and recommendation for a single task and push to the data store.

What should be PID 1 in a container?

In older version of Docker, Docker doesn’t reap child process correctly. As a result, for every request, docker spawns a new application and never terminated. This is called PID 1 zombie problem.

This will eat all available PIDs in the container.

Use Sysctl-a | grep pid_max to find maximum available PIDs in the container.

In the bare metal machine, PID 1 is systemd or any init program.

If the first process in the container is bash, then is PID 1 zombie process doesn’t occur.

Using bash is to handle all signal handlers is messy.

Yelp came up with Yelp/dumb-init. Now, dumb-init is PID 1 and no more zombie processes.

Docker-1.13, introduced the flag, --init.

Another solution uses system as PID 1

Docker allows running system without privilege mode.

Running system as PID 1 has other useful features like managing logs.

‘Razor’ sharp provision for bare metal servers

I attended only first half of the talk, fifteen minutes.

When you buy physical rack space in a data server how will you install the OS? You’re in Bangalore and server is in Amsterdam.

First OS installation on bare metal is hard.

There comes Network boot!

PXELinux is a syslinux derivative to boot OS from NIC card.

Once the machine comes up, DHCP request is broadcasted, and DHCP server responds.

Cobbler helps in managing all services running the network.

DHCP server, TFTP server, and config are required to complete the installation.

Microkernel in placed in TFTP server.

Razor is a tool to automate provisioning bare metal installation.

Razor philosophy, consume the hardware resource like the virtual resource.

Razor components - Nodes, Tags, Repository, policy, Brokers, Hooks

FreeBSD is not a Linux distribution

FreeBSD is a complete OS, not a distribution

Who uses? NetFlix, WhatsApp, Yahoo!, NetApp and more

Great tools, mature release model, excellent documentation, friendly license.

Now a lot of forks NetBSD, FreeBSD, OpenBSD and few more

Good file system. UFS, and ZFS. UFS high performance and reliable. - If you don’t want to lose data use ZFS!

Jails - GNU/Linux copied this and called containers!

No GCC only llvm/clang.

FreeBSD is forefront in developing next generation tools.

Pluggable TCP stacks - BBR, RACK, CUBIC, NewReno

Firewalls - Ipfw , PF

Dummynet - live network emulation tool

FreeBSD can run Linux binaries in userspace. It maps GNU/Linux system call with FreeBSD.

It can run on 256 cores machine.

Hard Ware - NUMA, ARM64, Secure boot/UEFI

Politics - Democratically elected core team

Join the Mailing list and send patches, you will get a commit bit.

Excellent mentor program - GSoC copied our idea.

FreeBSD uses SVN and Git revision control.

Took a dig at GPLV2 and not a business friendly license.

Read out BSD license on the stage.

[scmgalaxy]

[siva3155]

300+ TOP NAGIOS Interview Questions and Answers

NAGIOS Interview Questions for freshers experienced :-

1. What is Nagios? Nagios commonly known as the Nagios core is the open-source software that is designed to monitor networks, systems, applications, and infrastructures. The software directly sends the track down all the changes in the subject and send alerts if necessary. 2. How Nagios help DevOps professionals? Nagios was designed in the first place to monitor applications, networks, and infrastructures. The software automatically keeps an eagle eye and immediately report in case of failure. The quick response helps the DevOps professional to track down and resolve the problem in the early stages before it can cause any serious damage to the organization. 3. What makes Nagios an ideal tool for continuous monitoring? The below features of the Nagios is what makes it an ideal tool for continuous monitoring: Automatic problem fixing Infrastructure upgrades Business process and infrastructure monitoring Quick respond to the system issues 4. Write down some of the names of the Nagios monitoring tool for Linux mentoring? When you are using the Nagios to monitor the Linux environment then you need to understand that you are using one of the best tools on the planet. The complete package of Nagios includes service state, file system usage, system metrics, process state, and more. 5. How Icinga is related to the Nagios? Icinga is also open-source software that is used to monitor the networks and application. The core objective of designing Icinga in the first place to lift up the Nagios back in 2009. But it works as a separate monitor software. 6. Describe the active and passive check in Nagios In the Nagios, an active check is leveraged to “poll” a service or device for the status information every once in a while. Nagios basically supports the way to host down the devices and services passively. The key feature of the passive check is it can only be performed by the external applications. 7. Explain OID Nagios? Simple Network Management Protocol (SNMP)- a network protocol which is also designed for the monitoring purpose uses the Object Identifiers to define the Management Information Base. 8. Can you use Nagios to monitor the window machine? Yes, you can use Nagios to monitor the window machine. However, if you are doing it for the first time then you have to follow the given steps: Set the Nagios to monitor the window system Add a separate host and server for the window monitoring 9. Describe the Nagios XI? On the current basis, Nagios XI is one of the most powerful monitoring software in the market. when it comes to monitoring critical infrastructures such as network protocols, applications, services, systems metrics, and network protocols experts only relies upon the Nagios XI. 10. Highlights the benefits of using Nagios for monitoring? There are various benefits of using Nagios software for critical monitoring. The list of benefits includes: Infrastructure updates before the outdated system cause any sort of failure Automatic tracking and troubleshooting of problem Coordinate responses Continuously Monitor infrastructure without any break Response to issues on an immediate basis

NAGIOS Interview Questions 11. what active check means? Active check is the globally recognized way to monitor the hosts and services. Both Nagios XI and Nagios core use it on the pre-determined schedule. 12. Describe the Nagios Network Analyzer? A network analyzer is a crucial aspect of the Nagios software that allows it to deeply scan the entire system in a search of any potential threat. The quick and reliable scan allow system admin to gather necessary data regarding the health of the system and granular data through network analysis. 13. Highlight the primary benefits of monitoring the websites with Nagios? The key benefits of monitoring websites with Nagios are given below: It enhances the website availability Increase website performance Quick detection of online threats such as bugs and hijacking 14. Name down some databases that support Nagios monitoring? There are a number of databases that support Nagios and some of them are mentioned below: Oracle MySQL Microsoft SQL software Postgres 15. Write down the protocols that support Nagios Nagios supports the number of protocols monitoring including; SMTP Monitoring, IPMI Monitoring, FTP Monitoring, LDAP Monitoring, POP Monitoring, and DNS monitoring. 16. what do you understand by the fact that Nagios is object-oriented? As already mentioned above, Nagios is open-source object-oriented monitoring software. Here the term “object-oriented” means that users can create the object definitions in the Nagios that inheritance from other objects. This essential feature of the Nagios further simplifies the complex relationship between components. 17. Can I use Nagios for both cloud computing and cloud monitoring? Yes, the Nagios has a reputation as one of the best monitoring software in the market and you can use it for various monitoring purposes including both virtual and physical. 18. state the name of any four virtualization platforms that supports Nagios? VMware, Amazon EC2, Xen and Microsoft Virtual PC are some of the most common examples of the virtualization platforms that support the Nagios monitoring. 19. Do you know the port numbers Nagios use to monitor its clients? Yes, the Nagios uses port number; 5666, 5667 and 5668 to monitor its clients. 20. Describe the process to verify the Nagios configuration? If you want to configure the Nagios, then you have to run it with the -v command line with option like: nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg. 21. Define the objects in Nagios? In the Nagios, objects refer to all the elements that are involved in the entire monitoring and alerting logic. 22. What are the types of objects you can witness in Nagios? The types of objects you can witness in the Nagios includes; Services, Hosts, commands, host groups, contact, time periods, and notification escalations. 23. How can you use plugin X in Nagios? Just like any other plugin, you have to download plugin X from the official website of Nagios which is https://exchange.nagios.org/. Once downloaded, you can run it manually to see if it is working correctly. 24. When it comes to monetary terms what is the main difference between Nagios Core and Nagios XI? Well, when it comes to monetary terms, Nagios Core is the free open source version while Nagios XI is the paid version limited to the individual who held the license. 25. What is the current Nagios state type? On the current basis, the monitoring host and services are determined by the two major components First: Status of the host and service Second: Types of the state the host or service is in 26. What are the two main state types in Nagios? The Nagios have two key state types; soft states and hard states. 27. Define NRPRE in Nagios? The term NRPE stands for the Nagios Remote Plugin Executor addon which is specifically designed by the experts to execute Nagios plugins on the Linux machines. 28. What database format Nagios support to store status data? RRD is the database format Nagios support and uses to store the status data. 29. Write down the components of NDO Utilities? The NDO utilities are the right mixture of the: NDOMOD Event Broker Module FILE2SOCK Utility LOG2NDO Utility NDO2DB Daemon 30. Can we monitor the operating system through Nagios? Yes, you can monitor any operation system through Nagios as long as it supports the software. NAGIOS Questions and Answers Pdf Download Read the full article