Create troubleshooting.md

guide/troubleshooting.md

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+# Troubleshooting guide
+
+## Docker Swarm
+
+### List all functions
+
+```
+$ docker service ls
+```
+
+### Find a function's logs
+
+```
+$ docker swarm logs --tail 100 <function>
+```
+
+### Find out if a function failed to start
+
+```
+$ docker swarm ps --no-trunc=true <function>
+```
+
+## Kubernetes
+
+### List all functions
+
+```
+$ kubectl get deploy
+```
+
+### Find a function's logs
+
+```
+$ kubectl logs deploy/<function>
+```
+
+### Find out if a function failed to start
+
+```
+$ kubectl describe deploy/<function>
+```
+