Basic troubleshooting page for edge

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

Author: alexellis

docs/edge/overview.md

@@ -14,6 +14,7 @@ Most of the [OpenFaaS Pro documentation](/docs/openfaas-pro/) and [Helm charts](
 * [Air Gap](/edge/airgap)
 * [Custom DNS servers](/edge/custom-dns)
 * [Improve container security with gVisor](/edge/gvisor)
+* [Troubleshooting an installation](/edge/troubleshooting)
 
 ## OpenFaaS Edge guides 
 

docs/edge/troubleshooting.md

@@ -0,0 +1,36 @@
+# Troubleshooting OpenFaaS Edge
+
+There are more detailed notes in the eBook.
+
+## Find common issues
+
+Check the services:
+
+```bash
+journalctl -u faasd
+journalctl -u faasd-provider
+```
+
+Check the containers:
+
+```bash
+sudo faasd service logs gateway
+sudo faasd service logs queue-worker
+sudo faasd service logs faas-idler
+sudo faasd service logs prometheus
+```
+
+Check service output:
+
+```bash
+sudo faasd service list
+sudo faasd service top
+```
+
+Check the machine for free memory and disk space:
+
+```bash
+free -h
+df -h /
+```
+