Complete guide of OpenShift certification courses, tutorials & training

What is OpenShift? Containerization make possible for IT organizations to become more agile and scalable, which help them to become more efficient in application development. If we believe on Gartner’s…

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Detached (-d) mode in Docker – Explained

We use Docker detached mode (-d) when we want to connect to the container in an interactive mode or we can say when we just want application to be running…

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Complete Tutorials of PHP OOP Constants with Example code

In this Tutorial, we are going to learn about Complete Tutorials of PHP OOP Constants with Example code. Through this we will learn about the concept about Constants.  But first…

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Working with Prometheus Alert Manager tutorials

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DevOps Training Online – Class Recordings – January 2020

Dear Participants, Here are the consolidated URLs of DevOps training videos/class recordings/tutorials AWS Video Tutorial – January 2020 – (PDF – Notes) Docker Video Tutorial – January 2020 Part –…

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How to install and activate plugins in Moodle?

Moodle is an open source platform which is used for managing your course and it is also called CMS ( Course management system). Here I want to say you about…

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PHP Tutorial for Beginners

What is PHP? It is an open-source general-purpose scripting language that is especially suited for web development. Code executed on the server. It can be embedded in HTML. You should…

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SonarQube Interview Questions and Answer Part – 1

Is it right definition of Sonarqube? SonarQube (formerly Sonar) is a quality management platform focusing on continuous analysis of source code quality. YES (Ans) NO Which is not a severities…

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DevOps Training – Class Recordings/Tutorials – November 2019

AWS Session – Class recording – Tutorials Docker Session – Class recording – Tutorials Jira Session – Class recording – Tutorials Git Session – Class recording – Tutorials SonarQube Session…

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All about AWS Certified Cloud Practitioner- Foundation

This certification path is meant for individuals who are seeking to build and validate overall understanding of the AWS Cloud in spite of their specific technical roles. It provides a…

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kubernetes-yaml

Generate yaml file from existing Kubernetes resources of cluster?

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gradle-task

Gradle Tasks are exaplained in 10 mins!

Task in Gradle is a code that Gradle execute. Everything such a each type features is powered in Gradle using Plugin. Plugins add new tasks domain objects (e.g. SourceSet), conventions…

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aws-reserved-instance

How to buy Reserved Instance and verify if Reserved Instances are being used in AWS?

This article give 2 most important information about Reserved Instance. How to buy Reserved Instance in aws? Verify if Reserved Instances are being used? How do I buy Reserved Instances…

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ansible-install-centos-rhel

How to install Ansible in Centos 7/RHEL 7?

How to install Ansible in Centos 7/RHEL 7? Install Ansible via Pip in RHEL/CENTOS

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kibana-7-2-install-and-configuration-in-rhel-7-centos

Kibana 7.2 Install and configuration in RHEL 7/Centos

Install and Setup JDK 8+ Download and Install Kibana 7.X Configure Kibana 7.X How to start kibana service?

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elasticsearch-plugin

How to use elastic search EC2 discovery plugin?

Problem To increase the performance in Elasticsearch, many times we add new nodes to Elasticsearch cluster and manually change the configuration file with new IP address, etc. so that it…

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elasticsearch-error-node

Elastic Search Error – Node is started with node.data=false, but has shard data

[2019-07-11T09:59:18,013][ERROR][o.e.b.Bootstrap ] [es-master01] Exception java.lang.IllegalStateException: Node is started with node.data=false, but has shard data: [/home/ec2-user/elasticsearch-7.2.0/data/nodes/0/indices/6XsNftnbSbOnzPK3wOKc 0w/0]. Use ‘elasticsearch-node repurpose’ tool to clean up at org.elasticsearch.env.NodeEnvironment.ensureNoShardData(NodeEnvironment.java:1065) ~[elasticsearch-7.2.0.jar:7.2.0] at org.elasticsearch.env.NodeEnvironment.(NodeEnvironment.java:324) ~[elasticsearch-7.2.0.jar:7.2.0] Solution

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elastic-search-error-max-virtual-memory-areas

Elastic Search Error – max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

Errors [2]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144] Solution To make it persistent, you can add this line: $ sudo vi /etc/sysctl.conf…

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elastic-search-error-max-max-file-descriptors

Elastic Search Error – max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]

Elastic Search Error – max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535] Solution Temporary to the current login session To set ulimit value…

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application-x-ndjson-and-application-json

What is difference between application/x-ndjson and application/json?

Lets understand what is json? JSON stands for JavaScript Object Notation JSON is a lightweight format for storing and transporting data JSON is often used when data is sent from…

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