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posted by NCommander on Tuesday February 07 2017, @11:45AM   Printer-friendly
from the insert-systemd-rant-here dept.

So, in previous posts, I've talked about the fact that SoylentNews currently is powered on Ubuntu 14.04 + a single CentOS 6 box. Right now, the sysops have been somewhat deadlocked on what we should do going forward for our underlying operating system, and I am hoping to get community advice. Right now, the "obvious" choice of what to do is simply do-release-upgrade to Ubuntu 16.04. We've done in-place upgrades before without major issue, and I'm relatively certain we could upgrade without breaking the world. However, from my personal experience, 16.04 introduces systemd support into the stack and is not easily removable. Furthermore, at least in my personal experience, working with journalctl and such has caused me considerable headaches which I detailed in a comment awhile ago.

Discounting systemd itself, I've also found that Ubuntu 16.04 seems less "polished", for want of a better word. I've found I've had to do considerably more fiddling and tweaking to get it to work as a server distro than I had to do with previous releases, as well as had weird issues with LDAP. The same was also true when I worked with recent versions with Debian. As such, there's been a general feeling with the sysops that it's time to go somewhere else.

Below the fold are basically the options as we see them, and I hope if the community can provide some interesting insight or guidance.

Right now, we have about three years before security updates for 14.04 stop, and we are absolutely forced to migrate or upgrade. However, we're already hitting pain due to outdated software; I managed to briefly hose the DNS setup over the weekend trying to deploy CAA records for SN due to our version of BIND being outdated. When TLS 1.3 gets standardized, we're going to have a similar problem with our frontend load balancers. As such, I want to get a plan in place for migration so we can start upgrading over the next year instead of panicking and having to do something at the last moment

The SN Software Stack

As with any discussion for server operating system, knowing what our workloads and such is an important consideration. In short, this is what we use for SN, and the software we have to support

  • nginx - Loadbalancing/SSL Termination
  • Apache 2.2 + mod_perl - rehash (we run it with a separate instance of Apache and Perl, and not the system copy)
  • MySQL Cluster for production
  • MySQL standard for secondary services
  • Kerberos + Hesiod - single-signon/authetication
  • Postfix+Squirrelmail - ... mail

In addition, we use mandatory application controls (AppArmor) to limit the amount of stuff a given process can access for critical services to try and help harden security. We'd like to maintain support for this feature to whatever we migrate, either continuing with AppArmor, switching to SELinux, or using jails/zones if we switch operating systems entirely.

The Options

Right now, we've floated a few options, but we're willing to hear more.

A non-systemd Linux distro

The first choice is simply migrate over to a distribution where systemd is not present or completely optional. As of writing, Arch Linux, Gentoo, and Slackware are three such options. Our requirements for a Linux distribution is a good record of updates and security support as I don't wish to be upgrading the system once a week to a new release.

Release-based distributions

I'm aware of the Devuan project, and at first glance, it would seem like an obvious choice; Debian without systemd is the de-facto tagline. However, I've got concerns about the long-term suitability of the distribution, as well as an intentional choice to replace much of the time-tested Debian infrastructure such as the testing archive with a git-powered Jenkins instance in it's place. Another option would be slackware, but Slackware has made no indication that they won't adapt systemd, and is historically very weak with in-place upgrading and package management in general. Most of the other distributions on without-systemd.org are either LiveCDs, or are very small minority distros that I would be hesitant to bet the farm on with.

Rolling-release distributions

On the other side of the coin, and an option favored by at least some of the staff is to migrate to Gentoo or Arch, which are rolling-release. For those unaware, a rolling release distribution basically always has the latest version of everything. Security updates are handled simply by updating to the latest upstream package for the most part. I'm not a huge fan of this option, as we're dependent on self-built software, and it's not unheard of for "emerge world" to break things during upgrades due to feature changes and such. It would essentially require us to manually be checking release notes, and crossing our fingers every time we did a major upgrade. We could reduce some of this pain by simply migrating all our infrastructure to the form of ebuilds so that at least they would get rebuild as part of upgrading, but I'm very very hesitant about this option as a whole, especially for multiple machines.

Switch to FreeBSD/illumos/Other

Another way we could handle the problem is simply jump off the Linux ship entirely. From a personal perspective, I'm not exactly thrilled on the way Linux as a collective whole has gone for several years, and I see the situation only getting worse with time. As an additional benefit, switching off Linux gives us the possiblity of using real containers and ZFS, which would allow us to further isolate components of the stack, and give us the option to do rollbacks if ever necessary on a blocked upgrade; something that is difficult to impossible with most Linux distributions. As such, I've been favoring this option personally, though I'm not sold enough to make the jump. Two major options attract me of these two:

FreeBSD

FreeBSD has been around a long time, and has both considerable developer support, and support for a lot of features we'd like such as ZFS, jails, and a sane upstream. FreeBSD is split into two components, the core stack which is what constitutes a release, and the ports collection which is add-on software. Both can be upgraded (somewhat) independently of each other, so we won't have as much pain with outdated server components. We'd also have the ability to easy create jails for things like rehash, MySQL, and such and easily isolate these components from each other in a way that's more iron-clad than AppArmor or SELinux.

illumos

illumos is descended from OpenSolaris, and forked after Oracle closed up the source code for Solaris 11. Development has continued on it (at a, granted, slower place). Being the originator of ZFS, it has class A support for it, as well as zones which are functionally equivalent to FreeBSD jails. illumos also has support for SMF, which is essentially advanced service management and tracking without all the baggage systemd creates and tendrils throughout the stack. Zones can also be branded to run Linux binaries to some extent so we can handle migrating the core system over by simply installing illumos, restoring a backup into a branded zone, and then piecemeal decommissioning of said zone. As such, as an upgrade choice, this is fairly attractive. If we migrate to illumos, we'll either use the SmartOS distribution, or OpenIndiana.

Final Notes

Right now, we're basically on the fence with all options, so hopefully the community can provide their own input, or suggest other options we're not aware of. I look forward to your comments below!

~ NCommander

 
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  • (Score: 2) by NCommander on Tuesday February 07 2017, @04:11PM

    by NCommander (2) Subscriber Badge <michael@casadevall.pro> on Tuesday February 07 2017, @04:11PM (#464116) Homepage Journal

    Oh, second follow-up. OpenBSD was ruled out because it lacks both a MAC framework like AppArmor/SELinux, or a jails like functionality that FreeBSD and illumos offer.

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  • (Score: 2) by Subsentient on Wednesday February 08 2017, @04:02AM

    by Subsentient (1111) on Wednesday February 08 2017, @04:02AM (#464433) Homepage Journal

    Are you sure of that? OpenBSD's name is built entirely upon the idea of security. I'd find it hard to believe they're that unsophisticated.

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    • (Score: 2) by RedBear on Wednesday February 08 2017, @07:41AM

      by RedBear (1734) on Wednesday February 08 2017, @07:41AM (#464478)

      Are you sure of that? OpenBSD's name is built entirely upon the idea of security. I'd find it hard to believe they're that unsophisticated.

      Yes, he's sure. Believe it. To oversimplify the *BSD world, the relatively few differing variants of BSD have very different focuses:

      NetBSD: Portability between different CPU architectures.

      FreeBSD: Server/network efficiency and stability under extreme network loads.

      OpenBSD: Security above all else. Period.

      The thing with security is that it's extremely difficult to have verifiable security with an overly complex codebase that changes too quickly. So OpenBSD likes to keep things simple, and change slowly. Very slowly. They leave out features that other operating systems have had for years, if they don't think it's important. Performance, new features, new hardware support, new software support, everything takes a back seat to security and stability. All code in the base system has been through a comprehensive security audit which took several years. So OpenBSD is a great choice for something like a firewall box; not so much for a high-traffic database/web server cluster. FreeBSD is the proper choice for this situation.

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  • (Score: 2) by Dr Spin on Wednesday February 08 2017, @07:42AM

    by Dr Spin (5239) on Wednesday February 08 2017, @07:42AM (#464479)

    I think you are wrong about OpenBSD - just because it does not use the word "jails" does not mean the concept is not there.

    Try OpenBSD on Oracle T series hardware if you want high throughput and isolation of components (databases in different domains, and server in another different domain, and hardware separated too).
    You get Reliability and stability, as well as security. If you have a UPS, then 2 year up times are easy.

    Just don't touch any Oracle software (its highly infectious).

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