Linux and Linux Foundation: Teleport, APIStrat, Shrinking the Linux Kernel, and SDNs
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New Linux SSH server shows off Golang's infrastructure power
Gravitational, maker of a software-as-a-service support system built with Kubernetes, has released the latest open source iteration of a key part of that system.
Teleport, an SSH server that provides support teams with a simpler way to remotely manage server clusters, is an example of Google's Go language being used to devise safer but still performant replacements for critical infrastructure.
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APIStrat Becomes a Linux Foundation and Open API Initiative Event
The Linux Foundation, the nonprofit advancing professional open source management for mass collaboration, today announces that the API Strategy & Practice Conference has become a Linux Foundation event and will be jointly produced with the Open API Initiative (OAI), a Linux Foundation project. Linux Foundation events are where the world’s leading technologists meet, collaborate and innovate. APIStrat 2017 will take place October 31 – November 2 in Portland, OR.
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Shrinking the Linux Kernel and File System for IoT
At last year’s Embedded Linux Conference Europe, Sony’s Tim Bird warned that the stalled progress in reducing Linux kernel size meant that Linux was ceding the huge market in IoT edge nodes to real-time operating systems (RTOSes). At this February’s ELC North America event, another figure who has long been at the center of the ELC scene -- Free Electron’s Michael Opdenacker -- summed up the latest kernel shrinkage schemes as well as future possibilities. Due perhaps to Tim Bird’s exhortations, ELC 2017 had several presentations on reducing footprint, including Rob Landley’s Tutorial: Building the Simplest Possible Linux System.
Like Bird, Opdenacker bemoaned the lack of progress, but said there are plenty of ways for embedded Linux developers to reduce footprint. These range from using newer technologies such as musl, toybox, and Clang to revisiting other approaches that developers sometimes overlook.
In his talk, Opdenacker explained that the traditional motivator for shrinking the kernel was to speed boot time or copy a Linux image from low-capacity storage. In today’s IoT world, this has been joined with meeting the requirement for very small endpoints with limited resources. These aren’t the only reasons, however. “Some want to run Linux as a bootloader so they don’t have to re-create bootloader drivers, and some want to run to the whole system in internal RAM or cache,” said Opdenacker. “A small kernel can also reduce the attack surface to improve security.”
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SDN dilemma: Linux kernel networking vs. kernel bypass
If we've learned anything in the technology business in the last 25 years, it would be to never underestimate the Linux kernel. Why, then, have so many networking companies been so eager to bypass the Linux kernel -- or more specifically, the Linux kernel networking stack? What could be so wrong with the networking packet arteries in the Linux kernel that motivates so many of us to bypass them?
There are two main reasons. First, the kernel networking stack is too slow -- and the problem is only getting worse with the adoption of higher speed networking in servers and switches (10GbE, 25GbE, and 40GbE today, and rising to 50GbE and 100GbE in the near future). Second, handling networking outside the kernel allows for plugging in new technology without the need to change core Linux kernel code.
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