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Improve docs for runtimes (#1630)

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José Valim 2023-01-08 12:47:43 +01:00 committed by GitHub
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lib/livebook/notebook/learn/elixir_and_livebook.livemd
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@ -51,21 +51,6 @@ IO.puts(__ENV__.file)
IO.puts(__DIR__)
```
## Runtimes
Livebook has a concept of **runtime**, which in practice is an Elixir node responsible
for evaluating your code. You can choose the runtime by clicking the "Runtime" icon
(<i class="ri-livebook-runtime"></i>) on the sidebar (or by using the <kbd>s</kbd> <kbd>r</kbd>
keyboard shortcut).
By default, a new Elixir node is started (similarly to starting `iex`). You
can click reconnect whenever you want to discard the current node and start
a new one.
You can also manually *attach* to an existing distributed node by picking the
"Attached Node" runtime. To do so, you will need the Erlang Name of the external
node and its Erlang Cookie.
## Mix projects
Sometimes you may want to run a notebook within the context of an existing
@ -90,6 +75,37 @@ Mix.install(
)
```
## Runtimes
Livebook has a concept of **runtime**, which in practice is an Elixir node responsible
for evaluating your code. You can choose the runtime by clicking the "Runtime" icon
(<i class="ri-livebook-runtime"></i>) on the sidebar (or by using the <kbd>s</kbd> <kbd>r</kbd>
keyboard shortcut).
By default, a new Elixir node is started (similarly to starting `iex`). You can click
reconnect whenever you want to discard the current node and start a new one.
You can also manually *attach* to an existing distributed node by picking the
"Attached Node" runtime. To do so, you will need the Erlang Name of the external node
and its Erlang Cookie. For example, you can start a Phoenix application as follows:
```shell
$ iex --sname phoenix-app --cookie secret -S mix phx.server
```
Now open up a new notebook and click the "Runtime" icon on the sidebar.
Click to "Configure" the runtime and choose "Attached node". Input the
name and cookie as above and you should be ready to connect to it.
Note, however, that you can't install new dependencies on a connected runtime.
If you want to install dependencies, you have two options:
1. Use the Mix project approach outlined in the previous section;
2. Use a regular notebook and use `Node.connect/1`](https://hexdocs.pm/elixir/Node.html#connect/1)
to connect to your application. Use [the `:erpc` module](https://www.erlang.org/doc/man/erpc.html)
to fetch data from the remote node and execute code.
## More on branches #1
We already mentioned branching sections in