In this tutorial, we will look into the concepts of Wrapper Class in Java along with the mechanism of Autoboxing and Unboxing with examples. The wrapper classes are a place holder for a lot of static members to handle the primitive types. A few common members for all the wrapper classes are described below: All ... Read more
In this article, i will take you through 15 ansible-vault command examples to encrypt and decrypt sensitive data/files on Linux. Vault is a special feature in Ansible implemented using ansible-vault tool to encrypt all the sensitive information like password, variable, data and any other information you want to protect. This tool is frequently used to ... Read more
In this article, I will take you through 25 Best Crontab Command examples in Linux to Schedule Cron Jobs. You might have faced a scenario where you need to schedule a specific Job at certain day and at certain time in your Linux Servers to perform some specific task. This can be easily achieved by ... Read more
In this article, I will take you through the Steps to Install and Configure OpenLDAP Server on RHEL / CentOS 7. LDAP is known as Lightweight Directory Access Protocol which is generally used for Client Authentication to establish a session for running operations like search, read, write etc. LDAP Server are widely used in the ... Read more
Last night I was working on my systems then suddenly saw a lot of Nagios Alerts on Dashboard showing "Socket Timeout" error. Then I went to my Server from where I was getting the nagios alerts and then tried to check the nrpe service status. It seems nrpe was not running then I started troubleshooting ... Read more
In this article we will look into all the possible scenarios which can cause "nrpe.service: main process exited, code=exited, status=2/INVALIDARGUMENT" error and the solution to fix this error. You might have seen this error in a Server where you have installed nrpe client package. Basically Nagios connects the Servers through nrpe client package to gather ... Read more
In this article, i will take you through the best steps to install perl on Ubuntu 20.04. Perl (Practical Extraction and Reporting Language) is a very popular and powerful language for String Handling and String Processing. You will see the usage of Perl as web scripting language along with other web technologies and frameworks. It ... Read more
In this article, I will take you through 17 traceroute command examples to Identify Network Problems in Linux/Unix. traceroute command is a network diagnostic tool used in Linux based Systems to check and identify the network connectivity problems from source to destination. By default it will send the 60 byte packets for max 30 hops ... Read more
In this article, I will take you through best steps to Install Perl on RHEL/CentOS 8. Perl (Practical Extraction and Reporting Language) is a very popular and powerful language for String Handling and String Processing. You will see the usage of Perl as web scripting language along with other web technologies and frameworks. It is ... Read more
In this article, I will take you through step by step guide to install Jenkins on Ubuntu 20.04. Jenkins is an open source automation server used by the Developers/Testers around the world to build, deploy, exec and test the applications. It is frequently used as Continuous Deployment and Continuous Integration tool along with other DevOps ... Read more