Today after installing Java 12 on my laptop, I started seeing some issue about compiler version mismatch. In this tutorial we will go over steps on how to fix these errors. Error: A JNI error has …
How to Create, Start and Configure Amazon EC2 instance using simple Ansible Script? (spawn VM remotely)
Amazon AWS is no doubt the best public cloud out there. As we discussed in previous tutorials, Ansible is a very handy tool for sysops to maintain their company infrastructure. In this tutorial we …
How to Setup Amazon AWS CLI (Command Line Interface) on MacOS or Linux?
There is no doubt Amazon AWS is the biggest public cloud provider out there. I personally started playing with Amazon AWS for few of Crunchify's clients and I must say AWS is so flexible. I use my …
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What is Ansible pre_tasks? How to Update OS, Install Python and Install JRE on Remote Host [Linux]?
What is pre_tasks in Ansible? pre_tasks is a task which Ansible executes before executing any tasks mentioned in .yml file. Consider this scenario. You provisioned a new instance on Amazon EC2 …
How to install Boto, Boto3 and set Amazon EC2 Keys? Boto: A Python interface SDK for Amazon Web Services
What is Boto? Boto is an Amazon AWS SDK for python. Ansible internally uses Boto to connect to Amazon EC2 instances and hence you need Boto library in order to run Ansible on your …
How to Start Stop Apache Tomcat via Command Line? Check if Tomcat is already running and Kill command
Apache Tomcat (or simply Tomcat) is an open source web server and servlet container developed by the Apache Software Foundation (ASF). Tomcat implements the Java Servlet and the JavaServer Pages (JSP) …
JVM Tuning: Heapsize, Stacksize and Garbage Collection Fundamental
Heap Size: When a Java program starts, Java Virtual Machine gets some memory from Operating System. Java Virtual Machine or JVM uses this memory for all its need and part of this memory is call java …
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How to Style and Customize WordPress Comment Form? Plus, Modify appearance of Comments with CSS
comment_form() outputs a complete commenting form for use within a WordPress template. Most strings and form fields may be controlled through the $args array passed into the function, while you may …
Beginner’s Guide to Java eNum – Why and for What should I use Enum? Java Enum Examples
Enums are lists of constants like unchangeable variables. Have you heard of Final keyword? It's like that. When you need a predefined list of values which do represent some kind of numeric or …