Starting sessions and creating SSH endpoints

Once you choose a Runtime, you can start a session using the cdswctl sessions start command and create SSH endpoints using the cdswctl ssh-endpoint command.

The Runtime ID used in the following steps is obtained using the steps outlined in Listing ML Runtimes.

To enable Spark in the sessions, you will need the ID of the actual Spark Runtime Addon. List Runtime Addons with the following command:

cdswctl runtime-addons list

To start a session with a Runtime, use the cdswctl sessions start command, specifying the Runtime ID with the -r parameter and the project with the -p parameter.
For example:
```
cdswctl sessions start -r 2 -p demouser/runtimeproject
```
Add the necessary Spark Runtime Addon ID with the following parameter:
```
--addons=
```
To specify SSH endpoints for the Runtime sessions, use the cdswctl ssh-endpoint command and specify the Runtime ID using the -r parameter. and the project with the -p parameter.
For example:
```
cdswctl ssh-endpoint -r 1 -p demouser/runtimeproject
```