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today's howtos

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HowTos

  • Specify Name (Save As) When Saving File in vi / vim

    The vi (or vim) text editor is a very effective text editor for Linux / UNIX systems. It has been around since 1976 and you either love it or hate it. In order to be effective with the editor, it is important to know all the commands. One such command is specifying the name, or save as, of the file before you write it to disk. Let’s take a look at how to use the “save as” feature in vim.

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  • Josef Strzibny: Download RPM packages locally with DNF

    Sometimes, you only want to download RPM packages without installing them. This is now super easy with DNF.

    If you remember Yum, you had to resolve to installing a yum-plugin-downloadonly plugin or a separate tool to be able to download them for inspection.

  • Arturo Borrero González: Openstack Neutron L3 failover issues

    In the Cloud Services team at the Wikimedia Foundation we use Openstack Neutron to build our virtual network, and in particular, we rely on the neutron-l3-agent for implementing all the L3 connectivity, topology and policing. This includes basic packet firewalling and NAT.

    As of this writing, we are using Openstack version Train. We run the neutron-l3-agent on standard linux hardware servers with 10G NICs, and in general it works really well. Our setup is rather simple: we have a couple of servers for redundancy (note: upstream recommends having 3) and each server runs an instance of neutron-l3-agent. We don’t use DVR, so all ingress/egress network traffic (or north-south traffic) flows using these servers. Today we use a flat network topology in our cloud. This means that all of our virtual machines share the same router gateway. Therefore, we only have one software-defined router.

    Neutron does a very smart thing: each software-defined router is implemented on a linux network namespace (netns). Each router living on its own netns, the namespace contains all IP addresses, routes, interfaces, netfilter firewalling rules, NAT configuration, etc.

    Additionally, we configure the agents and software-defined routers to be deployed on an high availability fashion. Neutron implements this by running an instance of keepalived (VRRP) inside each router netns. The gateway IP is therefore a virtual address that can move between the two instances of the neutron-l3-agent.

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  • Prepare for successful container adoption with these tips

    IT teams use containers to build more dynamic applications and support modern microservice architectures. And containers are a critical tool for IT organizations to take advantage of innovations, such as cloud services, Agile methodology, DevOps collaboration and mobile apps.

    As businesses turn to containers to fuel development and support infrastructures, they must identify which workloads benefit from containerization, as well as strategize automation benefits and deploy the right tools for management.

    As a result, IT teams are better positioned to evaluate savings potential, adopt key DevOps processes and apply IT training where necessary. In this article, we explore containerization's history and its uses, assess ideal workloads, potential operational savings and key management approaches.

  • How to Install VirtualBox 6.1 On Linux?

    Virtual Machines are software used to run other operating systems within a pre-installed operating system. This self-contained OS runs as a separate computer that has no relation to the host OS. VirtualBox is an open-source cross-platform software that can help you run multiple guest operating systems on a single computer. In this article, let’s look at how to install VirtualBox 6.1 on Linux, easily.

    Why Install VirtualBox?

    One of the most important use cases of VirtualBox is its ability to try out/test various operating systems without fiddling with your internal storage. VirtualBox creates a virtual environment that utilizes system resources like RAM and CPU to power the OS inside a container.

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.