Add instructions on troubleshooting the V2 plugin

site/install/plugin/plugin-v2.md

@@ -78,3 +78,4 @@ Or to start a container:
 
  * [Integrating Docker via the Network Plugin (Legacy)](/site/install/plugin/plugin.md)
  * [How the Weave Network Plugins Work](/site/install/plugin/plugin-how-it-works.md)
+ * [Troubleshooting the V2 plugin](/site/troubleshooting.md#v2plugin)

site/troubleshooting.md

@@ -14,6 +14,7 @@ search_type: Documentation
    - [List attached containers](#list-attached-containers)
  * [Stopping Weave](#stop)
  * [Reboots](#reboots)
+ * [Troubleshooting the V2 plugin](#v2plugin)
  * [Snapshot Releases](#snapshots)
 
 ## <a name="diagnostics"></a>Basic Diagnostics
@@ -290,6 +291,27 @@ Proxy](/site/tasks/weave-docker-api/weave-docker-api.md) will re-attach any appl
 containers that it originally attached to the Weave network when they
 restart.
 
+## <a name="v2plugin"></a>Troubleshooting the V2 plugin
+
+If you have installed Weave Net via `docker plugin install`, then you
+will need to download the `weave` script to run `weave status`, `weave ps`
+or `weave report` as above.  Do this as described in the
+[install instructions](/site/install/installing-weave.md).
+
+Docker "v2" plugins run as containers, but at a lower level within the
+Docker environment, so you cannot view them with `docker ps`, `docker
+inspect`, etc.
+
+Do not run `weave launch`, `weave stop` or similar commands when using
+this plugin; use the `docker plugin` commands instead.  You can run
+`weave reset`, but only after disabling the plugin via `docker plugin disable`.
+
+Diagnostic logs from the plugin will go to the same place as the
+Docker daemon, which will depend on your Linux install. For example,
+if it uses `systemd`, then do this to view the Docker and plugin logs:
+
+    sudo journalctl -u docker
+
 ## <a name="snapshots"></a>Snapshot Releases
 
 Snapshot releases are published at times to provide previews of new