# Urbit Urbit is a clean-slate system software stack defined as a deterministic computer. An encrypted P2P network, `%ames`, runs on a functional operating system, Arvo, written in a strict, typed functional language, Hoon, which compiles itself to a combinator interpreter, Nock, whose spec gzips to 340 bytes. What is this for? Most directly, Urbit is designed as a personal cloud server for self-hosted web apps. It also uses HTTP APIs to manage data stuck in traditional web applications. More broadly, Urbit's network tackles identity and security problems which the Internet can't easily address. Programming for a deterministic single-level store is also a different experience from Unix programming, regardless of language. ## Getting involved If you're interested in following Urbit, you can: - Read our documentation at [urbit.org](http://urbit.org/docs) - Subscribe to our newsletter at [urbit.org](http://urbit.org). - Check out the [urbit-dev](https://groups.google.com/forum/#!forum/urbit-dev) mailing list. - Follow [@urbit \_](https://twitter.com/urbit\_) on Twitter. - Email us: [`urbit@urbit.org`](mailto:urbit@urbit.org). We're happy to answer questions and chat. ## Code of conduct Everyone involved in the Urbit project needs to understand and respect our code of conduct, which is: "don't be rude." # Install Urbit can be installed on most Unix systems. There is no Windows port. Windows is a wonderful OS, we just haven't gotten to it yet. Use a VM. ## Configure swap if needed Urbit wants to map 2GB of memory when it boots up. We won't necessarily use all this memory, we just want to see it. On a normal modern PC or Mac, this is not an issue. On some small cloud virtual machines (Amazon or Digital Ocean), the default memory configuration is smaller than this, and you need to manually configure a swapfile. To add swap to a DO droplet, [read this](https://www.digitalocean.com/community/tutorials/how-to-add-swap-on-ubuntu-14-04). To add swap on an Amazon instance, [read this](http://stackoverflow.com/questions/17173972/how-do-you-add-swap-to-an-ec2-instance) Don't spend a lot of time tweaking these settings; the simplest thing is fine. ## Install as a package ### Ubuntu or Debian Third-party packages are available, at: https://github.com/yebyen/urbit-deb Urbit is only supported on Jessie onward, but outbound SSL only works on Stretch onward, probably because of the OpenSSL version. ## Hand-build from source First, install all external dependencies. Then, make. ### Dependencies Urbit depends on: gcc (or clang) gmp libsigsegv openssl automake autoconf ragel cmake re2c libtool libcurl libssl-dev (Linux only) ncurses (Linux only) #### Ubuntu or Debian sudo apt-get install libgmp3-dev libsigsegv-dev openssl libssl-dev libncurses5-dev git make exuberant-ctags automake autoconf libtool g++ ragel cmake re2c libcurl4-gnutls-dev #### Fedora sudo dnf install gcc gcc-c++ git gmp-devel openssl-devel openssl ncurses-devel libsigsegv-devel ctags automake autoconf libtool ragel cmake re2c libcurl-devel #### AWS sudo yum --enablerepo epel install gcc gcc-c++ git gmp-devel openssl-devel ncurses-devel libsigsegv-devel ctags automake autoconf libtool cmake re2c libcurl-devel #### OS X - Homebrew brew install git gmp libsigsegv openssl libtool autoconf automake cmake #### OS X - Macports sudo port install git gmp libsigsegv openssl autoconf automake cmake Although `automake`/`autoconf`/`libtool` are generally installed by default, some have reported needing to uninstall and reinstall those three packages, at least with Homebrew. Your mileage may vary. #### FreeBSD pkg install git gmake gmp libsigsegv openssl automake autoconf ragel cmake re2c libtool curl #### Archlinux pacman -S gcc gmp libsigsegv openssl automake autoconf ragel cmake re2c libtool ncurses curl ### Download and make Clone the repo: git clone https://github.com/urbit/urbit.git `cd` to the directory you just created: cd urbit Run `make`: make (On FreeBSD, use `gmake` instead.) The executable is `bin/urbit`. # Start An urbit is a persistent server on the `%ames` P2P network. You'll create one of these servers now. If you have an invitation, it's a planet like `~fintud-macrep` and a ticket like `~fortyv-tombyt-tabsen-sonres`. Run urbit -w fintud-macrep -t fortyv-tombyt-tabsen-sonres (You can leave the `~` on, but it annoys some Unix shells.) If you don't have an invitation, pick a nickname for your comet, like `mycomet`. Urbit will randomly generate a 128-bit plot: urbit -c mycomet Either way, creating your urbit will take some time. Some of this time involves creating keys; some of it involves downloading code over Urbit itself. Go get a cup of coffee. Or a beer. Wait until you see a prompt, something like ~fintud-macrep:dojo> Your urbit is launched! Ladies and gentlemen, we are floating in space. In either case you'll notice that we created a directory in unix called either `mycomet` or `fintud-macrep`. All of your state (a log and checkpoint) lives in that directory. You can move it around, but don't delete it! ### Restarting If you want to shut your Urbit down you can `ctrl-d` from the `dojo>` prompt. To use Urbit normally after creating your planet or comet there's no need for the `-w -t` or `-c` options. Instead: urbit fintud-macrep or urbit mycomet ### Continuity breaches / network reboots Urbit is still young, and we reboot the network from time to time. Urbit can upgrade itself over the air, but at this stage it's easier to bring in breaking api changes this way. Since our crypto is stateful we call this a 'continuity breach'. If you have files in your Urbit you'd like to backup first make a copy of your pier. Then you'll need to shut down your urbit (with `^d`) and: git pull origin master make clean; make curl -o urbit.pill http://bootstrap.urbit.org/latest.pill Then start over at the top of this section. # Talk We use Urbit to talk to each other and coordinate about building the system. To join the main Urbit talk station use `^x` to switch to the `talk()` prompt, then run: ;join ~binzod/urbit-meta # Learn more Urbit's own official planet `~winsen-pagdel` hosts the public docs [here](http://urbit.org/docs). The docs also live in their own repo, [`urbit/docs`](http://github.com/urbit/docs). If this is your first time using Urbit, we'd recommend starting [here](http://urbit.org/docs/using/admin/). # Contributing The first step in contributing to urbit is to come and join us on `:talk`. For more detailed instructions check out [`CONTRIBUTING.md`](https://github.com/urbit/urbit/blob/master/CONTRIBUTING.md).