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Secure Linux: Atomicorp includes DRBD for replication

By Ava Mutchler

This post was previously published on Linbit’s company blog by Greg Eckert, which can be found here

Every so often we get a chance to test new¹ software. Usually this opportunity is driven by the question: Does DRBD play nicely with it?

At HostingCon this year, we met a team from Atomicorp and decided that it would be interesting to see if we could get DRBD running on this hardened version of Linux. Overall, LINBIT’s broad client-base loosely includes “security” since “Availability” is one of the 3 Security pillars of the CIA triad.

Security certainly fits with Atomicorp since they focus on clients in the federal, financial, healthcare, and hosting space. Their HQ is based in the same business park as Raytheon, Boeing, and Booz Allen Hamilton, if that tells you anything about their market.

We frequently take on the challenge of seeing if we can get DRBD compiled and working correctly, like that time we installed it on 2 raspberry pi’s, and this case was no different. While we were confident that there wouldn’t be issues with installation, — after all, it’s Linux — we needed to verify compatibility with the ASL (Atomic Secured Linux™) hardened kernel before announcing that it works.

After speaking with the Atomicorp team, they let us know that some of their clients were already running DRBD and Pacemaker for High Availability within their data centers. That’s great news! We anticipated that the testing would go quickly since we already had verified users.

Upon installing DRBD on a pair of RHEL 7 systems, we found something unexpected. DRBD is already included in the ASL kernel. This means Atomicorp is hardening and packaging a newer mainline kernel instead of hardening that which the distribution supplies. Nice work Atomicorp! The DRBD 8.4.5 version in the ASL kernel is pretty recent too.

It’s funny. Clients often ask us if we have seen DRBD used for their specific use case. DRBD is so versatile that we’re not always familiar with every situation. If we had been asked if anyone was using DRBD with Atomicorp’s ASL product, we would have said “I don’t know.” The irony here is that when you install the ASL hardened kernel, you may automatically get DRBD on a distribution where you otherwise may have not. It is available for everyone who runs Atomicorp’s ASL kernel whether the end user leverages the replication functionality or not².

This isn’t just a fun, internal office story; this is the essence of how Open Source Software works. We now know that there is a connection between ASL and DRBD, and are delighted to work with Atomicorp moving forward. It just makes sense since end-clients of both Atomicorp and LINBIT achieve feature-sets that they wouldn’t have otherwise. Altogether, our partners help advocate for our open source software and when our solutions are combined, everyone keeps inching toward bigger and better solutions, while maintaining focus on their core competencies.

So does the DRBD software work with Atomicorp and the Atomic Secured Linux™ kernel? Of course it does; and now, for the next few weeks, I get to be mocked by my coworkers for having our engineers test something which already had our software baked into it. 😉

1: New to us.
2: You’ll still need the userland utilities to manage and initialize DRBD, but that’s less of security concern than compiling and inserting a kernel module.


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