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Mention remote execution smart cell on intro

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José Valim 2023-10-02 21:11:58 +02:00
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lib/livebook/notebook/learn/intro_to_livebook.livemd
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@ -224,17 +224,23 @@ let's check it out.
### Communication and automation of Elixir systems
You may also deploy notebooks as applications that automate and monitor
live Elixir systems. You will use the same techniques
[as in the deploy guide](/learn/notebooks/deploy-apps) and from there
directly connect to your cluster.
live Elixir systems. By cliking on "+ Smart cell", you will find Livebook
provides a "Remote execution" widget, that allows you to configure the
node name, cookie, and the code you want to execute on the remote node.
To do so, you need to ensure Livebook is deployed in the same network
as your existing system. Then use [`Node.set_cookie/2`](https://hexdocs.pm/elixir/Node.html#set_cookie/2)
with the node you want to connect to and its cookie, and finally
explicitly call [`Node.connect/1`](https://hexdocs.pm/elixir/Node.html#connect/1)
to confirm the connection can be established successfully.
To execute code and retrieve data from the live node, use
[the `:erpc` module](https://www.erlang.org/doc/man/erpc.html).
The node and cookie information are configured directly in the production
system you want to connect to. For example, to connect to a
[Phoenix application](https://phoenixframework.org/) running on your machine,
you may start it as follows:
```shell
$ iex --sname phoenix-app --cookie secret -S mix phx.server
```
With this information in hand, you can query and automate tasks within
existing Elixir systems. You may also mix remote execution with Livebook's
rich features to [deploy applications](/learn/notebooks/deploy-apps)
that interact with those clusters.
<!-- livebook:{"break_markdown":true} -->
@ -245,33 +251,25 @@ 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 runtime is started (similarly to starting `iex`).
You can click reconnect whenever you want to discard the current runtime and
start a new one.
By default, a new Elixir runtime is started (similarly to starting `iex`)
for each notebook. You can click reconnect whenever you want to discard the
current runtime 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](https://phoenixframework.org/) as follows:
You can also manually *attach* to an existing node by picking the "Attached Node"
runtime. While in the previous section we used the "Remove execution" smart cell
to connect the default Livebook runtime to an existing node, the "Attached Node"
will make it so the Livebook runtime itself runs within the external node.
```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.
To do so, 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.
Any code that you execute in the notebook now runs within the Phoenix
application you connected to.
name and cookie from the remote node and you should be ready to connect
to it. Once connected, be careful: any code that you execute in the notebook
now runs within the connected application. You are also limited on actions
you may perform. For example, you can't install dependencies (nor that would
be a good idea on a running system).
You may also [connect your local Livebook instance to a node running in
production depending on your platform](https://fly.io/docs/elixir/advanced-guides/connect-livebook-to-your-app/).
Once connected, Livebook can run any code within your production nodes
(similar to a remote shell) which can be useful to debug and run checks
on live systems.
Attached nodes can't install new dependencies on a attached runtime
and, in general, we recommend it only for debugging of external system.
<!-- livebook:{"break_markdown":true} -->
@ -312,7 +310,7 @@ but in Erlang:
```
We are just beginning the Erlang integration and contributions to
enrich the support are welcome.
further enrich it are welcome.
## Evaluation vs compilation