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Kubernetes: Helm and Gardener Projects

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  • Helm Package Manager for Kubernetes Moves Forward

    The official release of version 3.0 of the Helm package manager for Kubernetes is designed to make it easier for IT organizations to discover and securely deploy software on Kubernetes clusters more easily.

    Taylor Thomas, a core contributor to Helm who is also a software developer for Nike, says for the last year the committee that oversees the development of Helm under the auspices of the Cloud Native Computing Foundation (CNCF) has been structuring the package manager to rely more on the application programming interfaces (APIs) that Kubernetes exposes to store records of installation. Helm Charts, which are collections of YAML files describing a related set of Kubernetes resources, now can be rendered on the client, eliminating the need for the Tiller resource management tool resident in the previous release of Helm that ran on the Kubernetes cluster.

    In addition to providing a more secure way to render Helm Charts, Thomas says this approach provides a more streamlined mechanism for packaging software using Helm. Helm 3.0 also updates Helm Charts and associated libraries.
    Additionally, a revamped Helm Go software development kit (SDK) is designed to make Helm more accessible, with the aim of sharing and reusing code the Helm community has open-sourced with the broader Go community, says Thomas.

  • Gardener Project Update

    Last year, we introduced Gardener in the Kubernetes Community Meeting and in a post on the Kubernetes Blog. At SAP, we have been running Gardener for more than two years, and are successfully managing thousands of conformant clusters in various versions on all major hyperscalers as well as in numerous infrastructures and private clouds that typically join an enterprise via acquisitions.

    We are often asked why a handful of dynamically scalable clusters would not suffice. We also started our journey into Kubernetes with a similar mindset. But we realized that applying the architecture and principles of Kubernetes to productive scenarios, our internal and external customers very quickly required the rational separation of concerns and ownership, which in most circumstances led to the use of multiple clusters. Therefore, a scalable and managed Kubernetes as a service solution is often also the basis for adoption. Particularly, when a larger organization runs multiple products on different providers and in different regions, the number of clusters will quickly rise to the hundreds or even thousands.

    Today, we want to give an update on what we have implemented in the past year regarding extensibility and customizability, and what we plan to work on for our next milestone.

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XFS - 2019 Development Retrospective

We frequently hear two complaints lodged against XFS -- memory reclamation runs very slowly because XFS inode reclamation sometimes has to flush dirty inodes to disk; and deletions are slow because we charge all costs of freeing all the file's resources to the process deleting files. Dave Chinner and I have been collaborating this year and last on making those problems go away. Dave has been working on replacing the current inode memory reclaim code with a simpler LRU list and reorganizing the dirty inode flushing code so that inodes aren't handed to memory reclaim until the metadata log has finished flushing the inodes to disk. This should eliminate the complaints that slow IO gets in the way of reclaiming memory in other parts of the system. Meanwhile, I have been working on the deletion side of the equation by adding new states to the inode lifecycle. When a file is deleted, we can tag it as needing to have its resources freed, and move on. A background thread can free all those resources in bulk. Even better, on systems with a lot of IOPs available, these bulk frees can be done on a per-AG basis with multiple threads. Read more Also: Oracle Talks Up Recent Features For XFS + Some File-System Improvements On The Horizon

Review: OpenIndiana 2019.10 Hipster

For me, the conclusion after battling with OpenIndiana for a few weeks is quite simple: the operating system's aim is to "ensure the continued availability of an openly developed distribution based on OpenSolaris" and it clearly achieves that goal. However, it does very little beyond that modest aim, and the lack of documentation makes it difficult to use OpenIndiana for people unfamiliar with OpenSolaris and/or Solaris. My advice for Linux users like me is to take plenty of time to get familiar with the operating system. At times I found using OpenIndiana hugely frustrating but that was largely because things weren't working as I expected. I am fairly confident that I would have solved most of the issues I encountered if I had spent more time with OpenIndiana. Some issues may be show-stoppers, including OpenIndiana's struggle with connecting to wireless networks and the limited amount of applications that are available. Many of these issues can be solved though. One of the main struggles I faced was finding documentation. The best place to look for information appears to be Oracle's Solaris documentation. Unfortunately, OpenIndiana's Hipster Handbook is not much use. It is mostly populated with content placeholders and the section on web servers counts exactly two words: "Apache" and "nginx". Even new features, such as the "native and metadata encryption" for ZFS and an option to disable hyper-treading are not mentioned in the handbook. At times OpenIndiana felt like an operating system that belongs in a museum. The set-up is quite old-school, the theme looks very dated and everything felt sluggish; the system is slow to boot and launching applications always took just a little too long for my liking. OpenIndiana's stand-out features are also nothing new - they are what made OpenSolaris a powerful operating system a decade years ago. Yet, in the Linux world there aren't many distros - if any - that have something like the Time Slider. openSUSE comes close but, in my humble opinion, OpenIndiana's Time Slider is more advanced and easier to use than OpenSUSE's Snapper. I am hoping Linux will catch up when it comes to OpenIndiana's ZFS goodness. Ubuntu is working on integrating ZFS, and I for one hope that in time there will be a Time Slider in file managers such as GNOME Files and Dolphin. Read more

OpenWiFi Open-Source Linux-compatible WiFi Stack Runs on FPGA Hardware

WiFi is omnipresent on most connected hardware, and when it works it’s great, but when there are issues oftentimes they can not be solved because the firmware is a closed-source binary. Read more