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How to Install Apache Solr on Oracle Linux 8

Apache Solr is an open-source, REST API-based search platform built on Apache Lucene Framework. It is also called “Searching On Lucene w/Replication.” Written in Java Language, Apache Solr is designed for scalability and fault tolerance. Solr is enterprise-ready, fast, and highly scalable, making it ideal for use in search-based and big data analytics applications. In simple terms, Solr is a ready-to-deploy search engine that is optimized to search large volumes of text-centric data.

In this post, we will show you how to install Apache Solr on Oracle Linux 8.

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How to Install Apache Cassandra on Oracle Linux 8

Apache Cassandra is an open-source, wide-column store NoSQL database management system designed to handle large amounts of data. Cassandra can be distributed across many servers to achieve high availability with no single point of failure. Generally, it is used to serve as a real-time operational data store for online transactional applications and as a read-intensive database for large-scale systems. Currently, it is used by many organizations including Netflix, Digg, Adobe, Twitter, HP, IBM, Rackspace, Cisco, and Reddit.

In this guide, we will explain how to install Apache Cassandra on Oracle Linux 8.

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How to Install Yarn NPM Package Manager on Oracle Linux 8

Yarn is a JavaScript package manager used to automate the installation, configuration, update, and removal of npm packages. Yarn stands for “Yet Another Resource Navigator.” It was developed by Facebook and is very similar to the npm package manager, with a focus on speed, security, and consistency. Yarn replaces the existing workflow of the npm client or other package managers while remaining compatible with the npm registry.

In this post, we will explain the following:

  • How to install Yarn using NPM
  • How to install Yarn from repository NPM
  • How to install Yarn using a script

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How to Connect to MySQL Using PHP

Free and open-source MySQL is one of the most popular relational database management systems. It is used to store the content of websites and web applications. If you want to integrate a PHP-based web application with MySQL, you will need to test whether PHP is able to connect to MySQL and execute database queries. To retrieve data from MySQL, you must establish a connection between the database and a PHP script. There are two ways to establish a connection between the database and a PHP script.

In this post, we will explain:

  • How to Connect to MySQL Using PHP MySQLi Extension
  • How to Connect to MySQL Using PHP Data Objects (PDO)

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How to Find Files with fd Command in Linux

Finding files and directories in Linux is an essential skill for any system administrator. The fd command is a command-line tool used to find files and directories in Linux. It is a simple and fast alternative to the find command. Compared to the find command, the fd command has more intuitive syntax, colorized output, and faster search speed. It also supports the use of regular expressions and can ignore hidden files and directories by default.

In this post, you will learn how to find files with fd command in Linux.

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How to Create a Sudo User in Rocky Linux 8

In Linux or Unix-based operating system, there are two types of users: a superuser (root) and a normal or regular user. The root user has full control of the operating system and it has privileges to run administrative commands like installing, removing, and updating software packages, changing permissions, and configuring different services. The non-root users have limited interactions with an operating system environment and they can perform only user-specific tasks.

The sudo command, short for “super-user do,” is a Linux utility that allows a normal user to run any commands with unlimited privileges. In this case, you will need to add a normal user to the sudo group in order to execute administrative commands.

In this post, we will show you how to create a sudo user in Rocky Linux 8.

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How To Set Up SSH Public and Private Key in Linux

SSH, also known as a “Secure Shell Protocol,” is a protocol used to access a remote Linux system securely over an unsecured network via the command-line interface. SSH allows users to run commands on remote Linux servers, install and remove software packages, and manage everything via command line from a single place.

If you are a Linux system administrator and managing multiple servers via SSH, then you may need to provide a root password each time when you connect to the remote server. Remembering passwords for thousands of servers is very difficult for an administrator. In this case, you can use an SSH public and private key pair to connect remote servers without entering a password.

In this post, we will show you how to create a public and private key and set up a Linux server for passwordless login.

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How to Kill Running Processes in Linux

In Linux, an instance of a running service, application, or script is called a process. When you run any command, program, or application, a process is created for it. Each process has its own process id that is associated with a specific user and group. If any processes consume too many resources or become unresponsive, then you may need to kill them. In this case, you can use the kill command to stop the process without restarting your server.

In this post, we will show you how to kill running processes in Linux.

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How to Change Open File Limit in Linux

If you are a Linux user and work with many files at a time, then you may often face the error “Too many open files” on Linux. This is because you have reached the maximum open file limit set by Linux operating system. In this case, you can use the ulimit command to change the default limit set by the operating system.

The max open file limit is very useful to prevent your system from sudden crashes. There are two types of open file limits in Linux.

  • Hard Limit: This limit can only be modified by the root user.
  • Soft Limit: This limit can be modified by any normal user. It indicates the current value of the session or user.

In this post, we will show you how to change the open file limit on Linux.

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How to Check Open Port on a Remote Linux System

A Port is a logical number assigned to a process running on Linux. Port can be defined as an integer number between 0 to 65535. Ports with numbers 0–1023 are called system or well-known ports, while ports with numbers 49152-65535 are called dynamic, private, or ephemeral ports. If you are a Linux system administrator then you should have the knowledge to find out which ports are open and running on a remote system. There are several ways to find an open port on Linux.

In this post, we will show the most reliable ways to find an open port on a remote Linux system.

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