+++ title = "Admin and Operations" weight = 1 template = "doc.html" +++ Your urbit (also called your _ship_) is a persistent Unix process that you mainly control from the console. For some things, a browser will also work. ## Shutdown You can turn your urbit off with `Ctrl-d` from the Talk or Dojo prompts. You can force-quit your urbit with `Ctrl-z` from anywhere. ## Restart To restart your urbit simply pass the name of your pier: ``` $ urbit some-planet ``` or ``` $ urbit comet ``` ## Logging To log an urbit's command line output to a file, use `script`: ``` $ script urbit.log urbit your-urbit ``` ## Moving your pier Piers are designed to be portable, but it _must_ be done while the urbit is turned off. Urbit networking is stateful, so you can't run two copies of the same urbit in two places. To move a pier, simply move the contents of the directory it lives in. To keep these files as small as possible we usually use the `--sparse` option in `tar`. With a pier `your-urbit/`, something like this should work: ``` tar -Scvzf ~/your-urbit.tar.gz ~/your-urbit/ scp your-old-server:~/your-urbit.tar.gz your-new-server:~ ``` Then to unzip it, on your other Unix server, run: ``` tar xfvz your-urbit.tar.gz ``` Delete the tar file, and, after installing Urbit on your new server, start your urbit back up with: ``` urbit your-urbit ``` ## Console Your Urbit terminal is separated into two parts: the prompt (the bottom line) and the record (everything above that). The record is shared; all the output from all the apps in your command set appears in it. The prompt is multiplexed. In the CLI, Urbit apps can process your input before you hit return. To see this in action try entering `)` as the first character at the Dojo prompt. Since there is no Dojo command or Hoon expression that starts with ')', the Dojo rejects it. `Ctrl-x` - Switches the prompt between running console apps `Ctrl-c` - Crash current event. Processed at the Unix layer and prints a stack trace. `Ctrl-d` - From Talk or Dojo, stops your Urbit process. `Ctrl-z` - Stops the Urbit process from _anywhere_. `↑` / `↓` - History navigation The following emacs-style key bindings are available: ``` Ctrl-a Cursor to beginning of the line (Home) Ctrl-b Cursor one character backward (left-arrow) Ctrl-e Cursor to the end of the line (End) Ctrl-f Cursor one character forward (right-arrow) Ctrl-g Beep; cancel reverse-search Ctrl-k Kill to end of line Ctrl-l Clear the screen Ctrl-n Next line in history (down-arrow) Ctrl-p Previous line in history (up-arrow) Ctrl-r Reverse-search Ctrl-t Transpose characters Ctrl-u Kill to beginning of line Ctrl-y Yank from kill buffer ``` Full coverage of the Urbit shell, the Dojo is covered in the [Shell walkthrough](../shell/). ## Web On startup Urbit tries to bind to `localhost:8080`. If you're already running something on `8080` -- such as another urbit -- you'll find the urbit that you just started on `8081`, and so on. For planets only, we also proxy web domains through Urbit's own servers. Any planet `~your-urbit` is also at `your-urbit.urbit.org`. Your urbit serves a simple homepage from `http://localhost:8080` or `https://your-urbit.urbit.org` that should be self-explanatory. Since our HTTPS isn't audited / battle tested, we just call it "secure" HTTPS. You can find that on `8443`. Or `8444` (and so on) if you're already running something on `8443`. A complete walkthrough of the Urbit web interface is [here](../web/). ## Moons Urbit namespace is distributed by having parent nodes sign the keys for child nodes. If you have a planet, your parent star issued your ticket. As a planet you, in turn, can sign the keys for moons. The basic idea is: your planet runs permanently in a data center somewhere and moons run on all your devices. Each planet can issue ~4 billion (`2^32`) moons. To generate a random moon from your planet, run: ``` ~sampel-palnet:dojo> +moon moon: ~faswep-navred-sampel-palnet \/~.0wd.rZU67.3jSny.z1vda.7sr-s.EL1Jt.-76Nj.ugXxY.g6-Bx.HvKZl.G53oV.hPnXe.7U3E3.J4CEe.MEVuq.~08Nt\/ .zNT0K.k-Ab~.Nn90d.OZ2fT.-XlQQ.Cfrkf.y6~K0.2Do09.EaE3W.BSK--.5Q~9N.y3QIP.eokH-.T6lwz.gg8MX.7LU5 x.DJROE.IzQsy.OXOLr.IOE3a.-QI40.H5ukK.Cw-u4.uxE-y.V-o1F.Q84g0.effP0.de01g.600g1 \/ \/ ``` You must manually edit the output of `+moon` to get the correct format for the ``: - strip out the `\/` - combine into one line, omitting spaces - trim the leading `~.` `` would be `0wd.rZU67.3jSny.z1vda ... ... effP0.de01g.600g1` in this example. Put `` in a file and that file becomes ``. Another way of generating `` is: ``` ~sampel-palnet:dojo> @moon/key +moon moon: ~faswep-navred-sampel-palnet ``` `` will be at `path/to/sampel-palnet/.urb/put/moon.key` and does not need editing to be used with the `-k` option. You can use the resulting output in the same installation flow from [install](../install) and [setup](../setup), following the same scheme as for booting a planet. That scheme is: ``` $ urbit -w -G -c ``` or ``` $ urbit -w -k -c ``` The `-c ` argument is not required, but it is recommended; otherwise, the resulting directory is a rather unwieldy moon name. Here's how an example moon might be booted: ``` $ urbit -w faswep-navred-sampel-palnet -G -c mymoon ``` or ``` $ urbit -w faswep-navred-sampel-palnet -k -c mymoon ``` Moons are automatically synced to their parent `%kids` desk, and can control applications on their parent planet using `|link`. You can read more about those operations in the [filesystem](../filesystem) and [console](../shell) walkthroughs, respectively. ## Continuity breaches While the Urbit network is in this alpha state, we sometimes have to reboot the whole network. This happens either when major changes need to be shipped or we hit a bug that can't be fixed over the air. Because Urbit networking is stateful we call this a _continuity breach_. Everything has to be restarted from scratch. Your pier will continue to function after we have breached, but it wont connect to the rest of the Urbit network. When this happens, back up any files you'd like to save, shut down your urbit and recreate it (as if you were starting for the first time).