FreeBSD In Two MonthsFri 28 October 2016
My last post was about CCC and it's almost the time for a new one. I was so bussy hacking things that I forgot I have a blog. Huge amount of new things happened to me, but I'll focus on the FreeBSD. I installed BETA1 of 11.0 as soon as it came out as I really wanted to see how good is the Docker support. Now I don't even use Docker, and FreeBSD is my main OS on laptop and desktop, although I still have Debian on desktop for the sake of recording my band. So let me give you some context and my history with this operating system.
I remember I was using 5.0 for a while and 4.9 before it for quite a while. The first thing I noticed is the size of the system and the speed at which world is compiled. It was so much faster to compile FreeBSD libc than glibc that I suspected that there's something missing in the BSD libc. For me, that was all I needed to switch from using SuSE 7.2 at the time (I think). It was 2003-2005 that I used FreeBSD with some pauses. As my university was under heavy influence by M$, I had trouble adjusting Linux to do what was needed. Doing the same on FreeBSD wasn't even poissible. Soon, I switch to Gentoo, as it was the next best thing.
To be honest, I never looked back to FreeBSD until two months ago. What I read was that version 11 is comming with the Docker support, which I used heavily on my servers. From past experience I knew about the beauty of FreeBSD build system and PF as firewall and ZFS and DTrace and ... I was lucky enough that about a month after I installed FreeBSD on my laptop, there was a EuroBSD conference in my country. Of course I rushed there! But something happened since then.
Talking to some of the clients and friends gave me impression that GPLv3 is scaring people and companies. As a huge fan of GNU, I just thought they are not using open source, so they don't know what they are talking about, but then I read about GPLv3 more. As a tool for binding people to write more open source code, it became monopolistic licence in a way that if anything is GPL, everything is GPL. This resonated in my head for some time and that was what made me realize why are BSD people so licence pure - you can't ignore business just because you have this vision in your head that says "everyone should write open source code". BSD community seamed (and it is) more permissive and open to the real world.
But licences are not my strong point, so I'll stick to the tech part. Let me just briefly describe some of the technologies in the BSD world. First in my book is ZFS. It is so much more than a file system. It has RAID included, if needed, it has copy-on-write, it's got 128bit system, it has volume manager and on top of it all, RAID is not just RAID, it's RAIDZ, meaning ZFS keeps extra checksum for every block, which make it super consistent.
Second on my list of favorite technologies is PF. It's so readable that sometimes I wonder if they screwed up implementation just to make it more readable (of course they didn't). Even so, it's strongest point is not syntax, it's statefulness of the firewall. PF deserves a post on it's on but to put the statefull firewall into context: it gives you more logical connections between the packets.
Third one is DTrace which stands for "dynamic tracer". It's an interesting idea that every OS is full of probes in different places, and when turned on, they give you information about ... well, depends what probs you enable. When no probe is enabled, it has no overhead at all, which makes it great for debugging production servers. It can trace kernel and user space and has a AWKish syntax.
Fourth, and last for this post is Jail. Although it's technology introduced in FreeBSD world in 2000, somehow it didn't get much publicity. Together with ZFS it makes one hell of a system for hosting stuff. Also, that's the core of FreeBSD implementation of Docker.
Almost none of that is what I'm working on, right now. Although I made a switch because of the above mentioned technologies, the main reason for me to hack it more is it's fully preemptive kernel, which is the core of any real time system. Real time makes sound better and delay from plucking a guitar string to hearing it on the speakers is lower. Most of the work on supporting audio interfaces with more than 8 channes is done by Hans Petter Selasky, so I'd like to publicly thank him for all the trouble he when through. Although my FreeBSD DAW is not perfect due to smaller number of audio apps then the number found in Linux world, it shows huge potential.
So to put it all together, what FreeBSD gives me is the power to have one machine for everything: security, firewalling, FS consistency, real time audio and development environment for any language I choose to work with. I really enjoy my new OS, but I have one concern. As I'm talking to people how great FreeBSD is, I'm affraid I'll become one of those preachers who can't stop talking. It's not my vocal cords I'm concerned about, as after all I am a singer in a metal band. It's the damage I might do to the FreeBSD as a project if I'm preaching about it too much.
Thank you, FreeBSD project!