Add advertise-addr info + small fixups for mentor week

docs/index.html

@@ -97,7 +97,7 @@ class: title
 
 Docker <br/> Orchestration <br/> Workshop
 
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+???
 
 ## Intros
 
@@ -117,7 +117,7 @@ on time, it's a good idea to have a breakfast with the attendees
 at e.g. 9am, and start at 9:30.
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+???
 
 ## Agenda
 
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 ## Chapter 4: deeper in Swarm
 
-(Additional/optional/bonus content!)
-
 - Dealing with stateful services
 - Scripting image building and pushing
 - Distributed Application Bundles
@@ -935,6 +933,55 @@ You can refer to the [NOMENCLATURE](https://github.com/docker/swarmkit/blob/mast
 
 ]
 
+If Docker tells you that it `could not choose an IP address to advertise`, see next slide!
+
+---
+
+## IP address to advertise
+
+- When running in Swarm mode, each node *advertises* its address to the others
+  <br/>
+  (i.e. it tells them *"you can contact me on 10.1.2.3:2377"*)
+
+- If the node has only one IP address (other than 127.0.0.1), it is used automatically
+
+- If the node has multiple IP addresses, you **must** specify which one to use
+  <br/>
+  (Docker refuses to pick one randomly)
+
+- You can specify an IP address or an interface name
+  <br/>(in the latter case, Docker will read the IP address of the interface and use it)
+
+- You can also specify a port number
+  <br/>(otherwise, the default port 2377 will be used)
+
+---
+
+## Which IP address should be advertised?
+
+- If your nodes have only one IP address, it's safe to let autodetection do the job
+
+  .small[(Except if your instances have different private and public addresses, e.g.
+  on EC2, and you are building a Swarm involving nodes inside and outside the
+  private network: then you should advertise the public address.)]
+
+- If your nodes have multiple IP addresses, pick an address which is reachable
+  *by every other node* of the Swarm
+
+- If you are using [play-with-docker](http://play-with-docker.com/), use the IP
+  address shown next to the node name
+
+  .small[(This is the address of your node on your private internal overlay network.
+  The other address that you might see is the address of your node on the
+  `docker_gwbridge` network, which is used for outbound traffic.)]
+
+Examples:
+
+```bash
+docker swarm init --advertise-addr 10.0.9.2
+docker swarm init --advertise-addr eth0:23777
+```
+
 ---
 
 ## Token generation
@@ -4645,7 +4692,9 @@ class: title
 ## [@jpetazzo](https://twitter.com/jpetazzo) <br/> [@docker](https://twitter.com/docker)
 -->
 
+<!--
 ## AJ ([@s0ulshake](https://twitter.com/s0ulshake)) <br/> Jérôme ([@jpetazzo](https://twitter.com/jpetazzo)) <br/> Tiffany ([@tiffanyfayj](https://twitter.com/tiffanyfayj))
+-->
 
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