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Episode 247: Interning for FreeBSD | BSD Now 247


Episode description

FreeBSD internship learnings, exciting developments coming to FreeBSD, running FreeNAS on DigitalOcean, Network Manager control for OpenBSD, OpenZFS User Conference Videos are here and batch editing files with ed.

Headlines What I learned during my FreeBSD intership

Hi, my name is Mitchell Horne. I am a computer engineering student at the University of Waterloo, currently in my third year of studies, and fortunate to have been one of the FreeBSD Foundation’s co-op students this past term (January to April). During this time I worked under Ed Maste, in the Foundation’s small Kitchener office, along with another co-op student Arshan Khanifar. My term has now come to an end, and so I’d like to share a little bit about my experience as a newcomer to FreeBSD and open-source development.

I’ll begin with some quick background — and a small admission of guilt. I have been an open-source user for a large part of my life. When I was a teenager I started playing around with Linux, which opened my eyes to the wider world of free software. Other than some small contributions to GNOME, my experience has been mostly as an end user; however, the value of these projects and the open-source philosophy was not lost on me, and is most of what motivated my interest in this position. Before beginning this term I had no personal experience with any of the BSDs, although I knew of their existence and was extremely excited to receive the position. I knew it would be a great opportunity for growth, but I must confess that my naivety about FreeBSD caused me to make the silent assumption that this would be a form of compromise — a stepping stone that would eventually allow me to work on open-source projects that are somehow “greater” or more “legitimate”. After four months spent immersed in this project I have learned how it operates, witnessed its community, and learned about its history. I am happy to admit that I was completely mistaken. Saying it now seems obvious, but FreeBSD is a project with its own distinct uses, goals, and identity. For many there may exist no greater opportunity than to work on FreeBSD full time, and with what I know now I would have a hard time coming up with a project that is more “legitimate”.

  • What I Liked

In all cases, the work I submitted this term was reviewed by no less than two people before being committed. The feedback and criticism I received was always both constructive and to the point, and it commented on everything from high-level ideas to small style issues. I appreciate having these thorough reviews in place, since I believe it ultimately encourages people to accept only their best work. It is indicative of the high quality that already exists within every aspect of this project, and this commitment to quality is something that should continue to be honored as a core value. As I’ve discovered in some of my previous work terms, it is all too easy cut corners in the name of a deadline or changing priorities, but the fact that FreeBSD doesn’t need to make these types of compromises is a testament to the power of free software.

It’s a small thing, but the quality and completeness of the FreeBSD documentation was hugely helpful throughout my term. Everything you might need to know about utilities, library functions, the kernel, and more can be found in a man page; and the handbook is a great resource as both an introduction to the operating system and a reference. I only wish I had taken some time earlier in the term to explore the different documents more thoroughly, as they cover a wide range of interesting and useful topics. The effort people put into writing and maintaining FreeBSD’s documentation is easy to overlook, but its value cannot be overstated.

  • What I Learned

Although there was a lot I enjoyed, there were certainly many struggles I faced throughout the term, and lessons to be learned from them. I expect that some of issues I faced may be specific to FreeBSD, while others may be common to open-source projects in general. I don’t have enough experience to speculate on which is which, so I will leave this to the reader.

The first lesson can be summed up simply: you have to advocate for your own work. FreeBSD is made up in large part by volunteer efforts, and in many cases there is more work to go around than people available to do it. A consequence of this is that there will not be anybody there to check up on you. Even in my position where I actually had a direct supervisor, Ed often had his plate full with so many other things that the responsibility to find someone to look at my work fell to me. Admittedly, a couple of smaller changes I worked on got left behind or stuck in review simply because there wasn’t a clear person/place to reach out to.

I think this is both a barrier of entry to FreeBSD and a mental hurdle that I needed to get over. If there’s a change you want to see included or reviewed, then you may have to be the one to push for it, and there’s nothing wrong with that. Perhaps this process should be easier for newcomers or infrequent contributors (the disconnect between Bugzilla and Phabricator definitely leaves a lot to be desired), but we also have to be aware that this simply isn’t the reality right now. Getting your work looked at may require a little bit more self-motivation, but I’d argue that there are much worse problems a project like FreeBSD could have than this.

I understand this a lot better now, but it is still something I struggle with. I’m not naturally the type of person who easily connects with others or asks for help, so I see this as an area for future growth rather than simply a struggle I encountered and overcame over the course of this work term. Certainly it is an important skill to understand the value of your own work, and equally important is the ability to communicate that value to others.

I also learned the importance of starting small. My first week or two on the job mainly involved getting set up and comfortable with the workflow. After this initial stage, I began exploring the project and found myself overwhelmed by its scale. With so many possible areas to investigate, and so much work happening at once, I felt quite lost on where to begin. Many of the potential projects I found were too far beyond my experience level, and most small bugs were picked up and fixed quickly by more experienced contributors before I could even get to them.

It’s easy to make the mistake that FreeBSD is made up solely of a few rock-star committers that do everything. This is how it appears at face-value, as reading through commits, bug reports, and mailing lists yields a few of the same names over and over. The reality is that just as important are the hundreds of users and infrequent contributors who take the time to submit bug reports, patches, or feedback. Even though there are some people who would fall under the umbrella of a rock-star committer, they didn’t get there overnight. Rather, they have built their skills and knowledge through many years of involvement in FreeBSD and similar projects.

As a student coming into this project and having high expectations of myself, it was easy to set the bar too high by comparing myself against those big committers, and feel that my work was insignificant, inadequate, and simply too infrequent. In reality, there is no reason I should have felt this way. In a way, this comparison is disrespectful to those who have reached this level, as it took them a long time to get there, and it’s a humbling reminder that any skill worth learning requires time, patience, and dedication. It is easy to focus on an end product and simply wish to be there, but in order to be truly successful one must start small, and find satisfaction in the struggle of learning something new. I take pride in the many small successes I’ve had throughout my term here, and appreciate the fact that my journey into FreeBSD and open-source software is only just beginning.

  • Closing Thoughts

I would like to close with some brief thank-you’s. First, to everyone at the Foundation for being so helpful, and allowing this position to exist in the first place. I am extremely grateful to have been given this unique opportunity to learn about and give back to the open-source world. I’d also like to thank my office mates; Ed: for being an excellent mentor, who offered an endless wealth of knowledge and willingness to share it. My classmate and fellow intern Arshan: for giving me a sense of camaraderie and the comforting reminder that at many moments he was as lost as I was. Finally, a quick thanks to everyone else I crossed paths with who offered reviews and advice. I appreciate your help and look forward to working with you all further.

I am walking away from this co-op with a much greater appreciation for this project, and have made it a goal to remain involved in some capacity. I feel that I’ve gained a little bit of a wider perspective on my place in the software world, something I never really got from my previous co-ops. Whether it ends up being just a stepping stone, or the beginning of much larger involvement, I thoroughly enjoyed my time here.

Recent Developments in FreeBSD

DigitalOcean Digital Ocean Promo Link for BSD Now Listeners

Running FreeNAS on a DigitalOcean Droplet
  • Need to backup your FreeNAS offsite? Run a locked down instance in the cloud, and replicate to it
  • The tutorial walks though the steps of converting a fresh FreeBSD based droplet into a FreeNAS
  • Create a droplet, and add a small secondary block-storage device
  • Boot the droplet, login, and download FreeNAS
  • Disable swap, enable ‘foot shooting’ mode in GEOM
  • use dd to write the FreeNAS installer to the boot disk
  • Reboot the droplet, and use the FreeNAS installer to install FreeNAS to the secondary block storage device
  • Now, reimage the droplet with FreeBSD again, to replace the FreeNAS installer
  • Boot, and dd FreeNAS from the secondary block storage device back to the boot disk
  • You can now destroy the secondary block device
  • Now you have a FreeNAS, and can take it from there.
  • Use the FreeNAS replication wizard to configure sending snapshots from your home NAS to your cloud NAS
  • Note: You might consider creating a new block storage device to create a larger pool, that you can more easily grow over time, rather than using the boot device in the droplet as your main pool.

News Roundup Network Manager Control for OpenBSD (Updated)
  • Generalities
  • I just remind the scope of this small tool:

    • allow you to pre-define several cable or wifi connections
    • let nmctl to connect automatically to the first available one
    • allow you to easily switch from one network connection to an other one
    • create openbox dynamic menus
  • Enhancements in this version

This is my second development version: 0.2. I've added performed several changes in the code:

  • code style cleanup, to better match the python recommendations
  • adapt the tool to allow to connect to an Open-wifi having blancs in the name. This happens in some hotels
  • implement a loop as work-around concerning the arp table issue.

The source code is still on the git of You can see the files here

And you can download the last version here

  • Feedbacks after few months

I'm using this script on my OpenBSD laptop since about 5 months. In my case, I'm mainly using the openbox menus and the --restart option.

  • The Openbox menus

The openbox menus are working fine. As explain in my previous blog, I just have to create 2 entries in my openbox's menu.xml file, and all the rest comes automatically from nmctl itself thanks to the --list and --scan options. I've not changed this part of nmctl since it works as expected (for me :-) ).

  • The --restart option

Because I'm very lazy, and because OpenBSD is very simple to use, I've added the command "nmctl --restart" in the /etc/apm/resume script. Thanks to apmd, this script will be used each time I'm opening the lid of my laptop. In other words, each time I'll opening my laptop, nmctl will search the optimum network connection for me. But I had several issues in this scenario. Most of the problems were linked to the arp table issues. Indeed, in some circumstances, my proxy IP address was associated to the cable interface instead of the wifi interface or vice-versa. As consequence I'm not able to connect to the proxy, thus not able to connect to internet. So the ping to google (final test nmctl perform) is failing. Knowing that anyhow, I'm doing a full arp cleanup, it's not clear for me from where this problem come from. To solve this situation I've implemented a "retry" concept. In other words, before testing an another possible network connection (as listed in my /etc/nmctl.conf file), the script try 3x the current connection's parameters. If you want to reduce or increase this figures, you can do it via the --retry parameter.

  • Results of my expertise with this small tool

Where ever I'm located, my laptop is now connecting automatically to the wifi / cable connection previously identified for this location. Currently I have 3 places where I have Wifi credentials and 2 offices places where I just have to plug the network cable. Since the /etc/apm/resume scripts is triggered when I open the lid of the laptop, I just have to make sure that I plug the RJ45 before opening the laptop. For the rest, I do not have to type any commands, OpenBSD do all what is needed ;-). I hotels or restaurants, I can just connect to the Open Wifi thanks to the openbox menu created by "nmctl --scan".

  • Next steps

  • Documentation

The tool is missing lot of documentation. I appreciate OpenBSD for his great documentation, so I have to do the same. I plan to write a README and a man page at first instances. But since my laziness, I will do it as soon as I see some interest for this tool from other persons.

  • Tests

I now have to travel and see how to see the script react on the different situations. Interested persons are welcome to share with me the outcome of their tests. I'm curious how it work.

OpenBSD 6.3 on EdgeRouter Lite simple upgrade method
  • TL;DR

OpenBSD 6.3 oceton upgrade instructions may not factor that your ERL is running from the USB key they want wiped with the miniroot63.fs image loaded on. Place the bsd.rd for OpenBSD 6.3 on the sd0i slice used by U-Boot for the kernel, and then edit the boot command to run it.

  • a tiny upgrade

The OpenBSD documentation is comprehensive, but there might be rough corners around what are probably edge cases in their user base. People running EdgeRouter Lite hardware for example, who are looking to upgrade from 6.2 to 6.3. The documentation, which gave us everything we needed last time, left me with some questions about how to upgrade. In INSTALL.octeon, the Upgrading section does mention: The best solution, whenever possible, is to backup your data and reinstall from scratch I had to check if that directive existed in the documentation for other architectures. I wondered if oceton users were getting singled out. We were not. Just simplicity and pragmatism.

  • Reading on:

To upgrade OpenBSD 6.3 from a previous version, start with the general instructions in the section "Installing OpenBSD". But that section requires us to boot off of TFTP or NFS. Which I don’t want to do right now. Could also use a USB stick with the miniroot63.fs installed on it. But as the ERL only has a single USB port, we would have to remove the USB stick with the current install on it. Once we get to the Install or Upgrade prompt, there would be nothing to upgrade. Well, I guess I could use a USB hub. But the ERL’s USB port is inside the case. With all the screws in. And the tools are neatly put away. And I’d have to pull the USB hub from behind a workstation. And it’s two am. And I cleaned up the cabling in the lab this past weekend. Looks nice for once. So I don’t want to futz around with all that. There must be an almost imperceptibly easier way of doing this than setting up a TFTP server or NFS share in five minutes… Right?

iXsystems Boise Technology Show 2018 Recap

OpenZFS User Conference Slides & Videos

Batch editing files with ed
  • what’s ‘ed’?

ed is this sort of terrifying text editor. A typical interaction with ed for me in the past has gone something like this:

$ ed help ? h ? asdfasdfasdfsadf ? <close terminal in frustration>

Basically if you do something wrong, ed will just print out a single, unhelpful, ?. So I’d basically dismissed ed as an old arcane Unix tool that had no practical use today. vi is a successor to ed, except with a visual interface instead of this ?

  • surprise: Ed is actually sort of cool and fun

So if Ed is a terrifying thing that only prints ? at you, why am I writing a blog post about it? WELL!!!! On April 1 this year, Michael W Lucas published a new short book called Ed Mastery. I like his writing, and even though it was sort of an april fool’s joke, it was ALSO a legitimate actual real book, and so I bought it and read it to see if his claims that Ed is actually interesting were true. And it was so cool!!!! I found out:

  • how to get Ed to give you better error messages than just ?
  • that the name of the grep command comes from ed syntax (g/re/p)
  • the basics of how to navigate and edit files using ed

All of that was a cool Unix history lesson, but did not make me want to actually use Ed in real life. But!!!

The other neat thing about Ed (that did make me want to use it!) is that any Ed session corresponds to a script that you can replay! So if I know Ed, then I can use Ed basically as a way to easily apply vim-macro-like programs to my files.

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July 25th, 2018


FreeBSD ULE vs. Linux CFS, OpenBSD on Tuxedo InfinityBook, how zfs diff reports filenames efficiently, why choose FreeBSD over Linux, PS4 double free exploit, OpenBSD’s wifi autojoin, and FreeBSD jails the hard way.

Episode 255: What Are You Pointing At | BSD Now 255

July 18th, 2018


What ZFS blockpointers are, zero-day rewards offered, KDE on FreeBSD status, new FreeBSD core team, NetBSD WiFi refresh, poor man’s CI, and the power …

Episode 254: Bare the OS | BSD Now 254

July 12th, 2018


Control flow integrity with HardenedBSD, fixing bufferbloat with OpenBSD’s pf, Bareos Backup Server on FreeBSD, MeetBSD CfP, crypto simplified …

Episode 253: Silence of the Fans | BSD Now 253

July 5th, 2018


Fanless server setup with FreeBSD, NetBSD on pinebooks, another BSDCan trip report, transparent network audio, MirBSD's Korn Shell on Plan9, static site generators on OpenBSD, and more.

###Silent Fanless …

Episode 252: Goes to 11.2 | BSD Now 252

June 28th, 2018


FreeBSD 11.2 has been released, setting up an MTA behind Tor, running pfsense on DigitalOcean, one year of C, using OpenBGPD to announce VM networks, the power to serve, and a BSDCan trip report.

###FreeBSD …

Episode 251: Crypto HAMMER | BSD Now 251

June 21st, 2018


DragonflyBSD’s hammer1 encrypted master/slave setup, second part of our BSDCan recap, NomadBSD 1.1-RC1 available, OpenBSD adds an LDAP client to …

Episode 250: BSDCan 2018 Recap | BSD Now 250

June 14th, 2018


TrueOS becoming a downstream fork with Trident, our BSDCan 2018 recap, HardenedBSD Foundation founding efforts, VPN with OpenIKED on OpenBSD, FreeBSD on a System76 Galago Pro, and hardware accelerated crypto on Octeons.

Episode 249: Router On A Stick | BSD Now 249

June 6th, 2018


OpenZFS and DTrace updates in NetBSD, NetBSD network security stack audit, Performance of MySQL on ZFS, OpenSMTP results from p2k18, legacy Windows …

Episode 248: Show Me The Mooney | BSD Now 248

May 29th, 2018


DragonflyBSD release 5.2.1 is here, BPF kernel exploit writeup, Remote Debugging the running OpenBSD kernel, interview with Patrick Mooney, FreeBSD buildbot setup in a jail, dumping your USB, and 5 years of gaming on …

Episode 246: Properly Coordinated Disclosure | BSD Now 246

May 17th, 2018


How Intel docs were misinterpreted by almost any OS, a look at the mininet SDN emulator, do’s and don’ts for FreeBSD, OpenBSD community going gold, …

Episode 245: ZFS User Conf 2018 | BSD Now 245

May 10th, 2018


Allan’s recap of the ZFS User conference, first impressions of OmniOS by a BSD user, Nextcloud 13 setup on FreeBSD, OpenBSD on a fanless desktop computer, an intro to HardenedBSD, and DragonFlyBSD getting some SMP …

Episode 244: C is a Lie | BSD Now 244

May 3rd, 2018


Arcan and OpenBSD, running OpenBSD 6.3 on RPI 3, why C is not a low-level language, HardenedBSD switching back to OpenSSL, how the Internet was …

Episode 243: Understanding The Scheduler | BSD Now 243

April 25th, 2018


OpenBSD 6.3 and DragonflyBSD 5.2 are released, bug fix for disappearing files in OpenZFS on Linux (and only Linux), understanding the FreeBSD CPU …

Episode 242: Linux Takes The Fastpath | BSD Now 242

April 18th, 2018


TrueOS Stable 18.03 released, a look at F-stack, the secret to an open source business model, intro to jails and jail networking, FreeBSD Foundation March update, and the ipsec Errata.

Headlines TrueOS STABLE 18.03 …

Episode 241: Bowling in the LimeLight | BSD Now 241

April 12th, 2018


Second round of ZFS improvements in FreeBSD, Postgres finds that non-FreeBSD/non-Illumos systems are corrupting data, interview with Kevin Bowling, BSDCan list of talks, and cryptographic right answers.

Episode 240: TCP Blackbox Recording | BSD Now 240

April 7th, 2018


New ZFS features landing in FreeBSD, MAP_STACK for OpenBSD, how to write safer C code with Clang’s address sanitizer, Michael W. Lucas on sponsor gifts, TCP blackbox recorder, and Dell disk system hacking.

Episode 239: The Return To ptrace | BSD Now 239

March 29th, 2018


OpenBSD firewalling Windows 10, NetBSD’s return to ptrace, TCP Alternative Backoff, the BSD Poetic license, and AsiaBSDcon 2018 videos available.

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