Installation of plugins is simple:
Put the plugin file, such as
some-plugin.zip, into the Rundeck server's libext dir:
cp some-plugin.zip $RDECK_BASE/libext
The plugin is now enabled, and any providers it defines can be used by nodes or projects.
The Rundeck server does not have to be restarted.
You can simply remove the plugin files from
$RDECK_BASE/libext to uninstall them.
You can overwrite an old plugin with a newer version to update it.
See Bundled Plugins.