Language Selection

English French German Italian Portuguese Spanish

Server: Docker Swarm, Kubernetes, DevOps, Running Apache Cassandra on Kubernetes

Filed under
Server
  • Difference between Docker swarm and Kubernetes

    When you are on learning curve of application containerization, there will be a stage when you come across orchestration tools for containers. If you have started your learning with Docker then Docker swarm is the first cluster management tool you must have learnt and then Kubernetes. So its time to compare docker swarm and Kubernetes. In this article, we will quickly see what is docker, what is kubernetes and then comparison between the two.

  • Stop Killing Your Cattle: Server Infrastructure Advice

    If you've spent enough time at DevOps conferences, you've heard the phrase "pets versus cattle" used to describe server infrastructure. The idea behind this concept is that traditional infrastructure was built by hand without much automation, and therefore, servers were treated more like special pets—you would do anything you could to keep your pet alive, and you knew it by name because you hand-crafted its configuration. As a result, it would take a lot of effort to create a duplicate server if it ever went down. By contrast, modern DevOps concepts encourage creating "cattle", which means that instead of unique, hand-crafted servers, you use automation tools to build your servers so that no individual server is special—they are all just farm animals—and therefore, if a particular server dies, it's no problem, because you can respawn an exact copy with your automation tools in no time.

    If you want your infrastructure and your team to scale, there's a lot of wisdom in treating servers more like cattle than pets. Unfortunately, there's also a downside to this approach. Some administrators, particularly those that are more junior-level, have extended the concept of disposable servers to the point that it has affected their troubleshooting process. Since servers are disposable, and sysadmins can spawn a replacement so easily, at the first hint of trouble with a particular server or service, these administrators destroy and replace it in hopes that the replacement won't show the problem. Essentially, this is the "reboot the Windows machine" approach IT teams used in the 1990s (and Linux admins sneered at) only applied to the cloud.

  • Running Apache Cassandra on Kubernetes

    The Cassandra controller can, of course, perform operations within the Cassandra cluster. For example, want to scale down your Cassandra cluster? Instead of manipulating the StatefulSet to handle this task, the controller will see the CRD change. The node count will change to a lower number (say from six to five). The controller will get that state change, and it will first run a decommission operation on the Cassandra node that will be removed. This ensures that the Cassandra node stops gracefully and redistributes and rebalances the data it holds across the remaining nodes. Once the Cassandra controller sees this has happened successfully, it will modify that StatefulSet definition to allow Kubernetes to decommission that pod. Thus, the Cassandra controller brings needed intelligence to the Kubernetes environment to run Cassandra properly and ensure smoother operations.

    As we continue this project and iterate on the Cassandra operator, our goal is to add new components that will continue to expand the tool's features and value. A good example is Cassandra SideCar (shown in the diagram above), which can take responsibility for tasks like backups and repairs. Current and future features of the project can be viewed on GitHub. Our goal for the Cassandra operator is to give devs a powerful, open source option for running Cassandra on Kubernetes with a simplicity and grace that has not yet been all that easy to achieve.

More in Tux Machines

digiKam 7.7.0 is released

After three months of active maintenance and another bug triage, the digiKam team is proud to present version 7.7.0 of its open source digital photo manager. See below the list of most important features coming with this release. Read more

Dilution and Misuse of the "Linux" Brand

Samsung, Red Hat to Work on Linux Drivers for Future Tech

The metaverse is expected to uproot system design as we know it, and Samsung is one of many hardware vendors re-imagining data center infrastructure in preparation for a parallel 3D world. Samsung is working on new memory technologies that provide faster bandwidth inside hardware for data to travel between CPUs, storage and other computing resources. The company also announced it was partnering with Red Hat to ensure these technologies have Linux compatibility. Read more

today's howtos

  • How to install go1.19beta on Ubuntu 22.04 – NextGenTips

    In this tutorial, we are going to explore how to install go on Ubuntu 22.04 Golang is an open-source programming language that is easy to learn and use. It is built-in concurrency and has a robust standard library. It is reliable, builds fast, and efficient software that scales fast. Its concurrency mechanisms make it easy to write programs that get the most out of multicore and networked machines, while its novel-type systems enable flexible and modular program constructions. Go compiles quickly to machine code and has the convenience of garbage collection and the power of run-time reflection. In this guide, we are going to learn how to install golang 1.19beta on Ubuntu 22.04. Go 1.19beta1 is not yet released. There is so much work in progress with all the documentation.

  • molecule test: failed to connect to bus in systemd container - openQA bites

    Ansible Molecule is a project to help you test your ansible roles. I’m using molecule for automatically testing the ansible roles of geekoops.

  • How To Install MongoDB on AlmaLinux 9 - idroot

    In this tutorial, we will show you how to install MongoDB on AlmaLinux 9. For those of you who didn’t know, MongoDB is a high-performance, highly scalable document-oriented NoSQL database. Unlike in SQL databases where data is stored in rows and columns inside tables, in MongoDB, data is structured in JSON-like format inside records which are referred to as documents. The open-source attribute of MongoDB as a database software makes it an ideal candidate for almost any database-related project. This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you the step-by-step installation of the MongoDB NoSQL database on AlmaLinux 9. You can follow the same instructions for CentOS and Rocky Linux.

  • An introduction (and how-to) to Plugin Loader for the Steam Deck. - Invidious
  • Self-host a Ghost Blog With Traefik

    Ghost is a very popular open-source content management system. Started as an alternative to WordPress and it went on to become an alternative to Substack by focusing on membership and newsletter. The creators of Ghost offer managed Pro hosting but it may not fit everyone's budget. Alternatively, you can self-host it on your own cloud servers. On Linux handbook, we already have a guide on deploying Ghost with Docker in a reverse proxy setup. Instead of Ngnix reverse proxy, you can also use another software called Traefik with Docker. It is a popular open-source cloud-native application proxy, API Gateway, Edge-router, and more. I use Traefik to secure my websites using an SSL certificate obtained from Let's Encrypt. Once deployed, Traefik can automatically manage your certificates and their renewals. In this tutorial, I'll share the necessary steps for deploying a Ghost blog with Docker and Traefik.