Apache Bench is a useful little tool for testing the response time of a webservice, and thus the performance of the webserver. We can specify the number of requests to send, the target URL, set up concurrency, just to name a few of this tool's settings.

While such simulated workloads will not result exactly the same data that real world traffic will do, it is always a good idea to test before going to production. Maybe before deploying a new version of the application, we could run the tests on the new version, and compare the results with the previous test data to see if our application will serve slower, or faster than the last version. With well-planned testing, this tool can show the possible bottlenecks of the application, and may provide points of interest where we should look into our code for possible optimization.

In this tutorial we will install Apache Bench on Red Hat Enterprise Linux 8, as well as an Apache Webserver to run some tests against.

In this tutorial you will learn:
  • How to install Apache Bench
  • How to install httpd webserver, and add some basic content
  • How to run simple tests against the webserver

Apache Cassandra is an open-source NoSQL database. One of it's main features is it's decentralized nature that gives unique fault tolerance. Having our data replicated across datacenters means our production will not suffer from the loss of one of our sites, something all sysadmins dream of (or really happy to have such setup).

In this tutorial we will install Cassandra on Red Hat Enterprise Linux 8 by adding the Cassandra repository, install the software, and set up all else needed to have our service up and running and easy to manage.

In this tutorial you will learn:
  • How to add Cassandra repository
  • How to install needed packages
  • How to repair systemd unit file
  • How to test Cassandra with cqlsh

Apache Kafka is a distributed streaming platform. With it's rich API (Application Programming Interface) set, we can connect mostly anything to Kafka as source of data, and on the other end, we can set up a large number of consumers that will receive the steam of records for processing. Kafka is highly scaleable, and stores the streams of data in a reliable and fault-tolerant way. From the connectivity perspective, Kafka can serve as a bridge between many heterogeneous systems, which in turn can rely on it's capabilities to transfer and persist the data provided.

In this tutorial we will install Apache Kafka on a Red Hat Enterprise Linux 8, create the systemd unit files for ease of management, and test the functionality with the shipped command line tools.

In this tutorial you will learn:
  • How to install Apache Kafka
  • How to create systemd services for Kafka and Zookeeper
  • How to test Kafka with command line clients

Deleting user on RHEL 8 / CentOS 8 Linux system can be accomplished using the userdel command.

In this tutorial you will learn:
  • How to delete user on RHEL 8 / CentOS 8.
  • How to force user deletion.
  • How to delete user as well as its home directory.

Gdb or GNU Project Debugger is a great tool when you need to debug a program. You can set breakpoints, watch for value change of a variable, or even change a value for the program while it is halted at a point of it's state, then continue, just to pick some of the features of gdb.

In this tutorial we will install gdb on RHEL 8, and test how it is working with a simple C application.

In this tutorial you will learn:
  • How to install gdb
  • How to compile a simple C application with debug symbols
  • How to set breakpoints in the running application with gdb
  • How to print actual values of given variables within the application

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