File operations using Java are my favorite part. There are number of tutorials you may have seen on Crunchify like append data to file, read data from file, read and parse JSON file, read config.properties file during server startup, etc. In this tutorial we will go over steps on how
As by now you probably know, I’ve been working on Ansible a lot lately. In this tutorial we will go over how to terminate all AWS EC2 instances programmatically using Ansible script. Before you go over this tutorial, make sure you have setup Ansible correctly on your laptop/desktop. On Crunchify,
It’s been few months I started playing with Ansible. In this tutorial, we will go over how to use vars_prompt ansible section if you may wish to prompt the user for certain input while running ansible playbook. Let’s get started: Step-1 Create hosts file and put it under folder called
Let’s take a look at a problem in which you may want to capture Tcpdump output in your Java Program. You may need TCPDump data with N number of possibilities. This is a tcpdump Tutorial and Tcpdump usage examples and How to dump packets with tcpdump. You will also learn on
Docker no doubt is the Best Container Management Platform for your Enterprise and/or Personal project need. Why we need Docker? Consider this simple scenario for your project. You have a complex Java Enterprise application with more than 50 maven dependencies. You have few more local services dependencies. You have your
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 cloud or Google Cloud. First thing you need to do is to install OS updates. Then install latest Python,
Are you getting below exception while running ElasticSearch? java.lang.RuntimeException: can not run elasticsearch as root Why is it ElasticSearch is not allowed to run as root? Elasticsearch is a process, which I believe has not need to access any system root features and can run easily without any of the
As a part of IT management department, folks deal with lots of scripts and command line tools. I’m sure you face day to day situation in which you have copy files or scripts to thousands of remote hosts. IT department folks don’t just login to each thousands of hosts and
TC is a linux command using which you could manipulate traffic control settings. In Linux, TC command is used to Show or Manipulate traffic control settings. Why do you need to add small delay to a specific site? Think about this scenario: In Production site, you are getting some
