zt-kubernetes tutorial outline

doc/ext/ztkube.md

@@ -0,0 +1,96 @@
+Kubernetes + ZeroTier
+====
+
+A self-authorizing Kubernetes deployment on a ZeroTier private network.
+
+This is a quick tutorial for setting up a Kubernetes deployment which can self-authorize each new replica onto your private ZeroTier network with no additional configuration needed when you scale. The Kubernetes-specific instructions and content is based on the [hellonode](http://kubernetes.io/docs/hellonode/) tutorial.
+
+
+
+## Preliminary tasks
+
+**Step 1: Go to [my.zerotier.com](https://www.my.zerotier.com) and generate an API key. This key will be used by ZeroTier to automatically authorize new instances of your VMs to join your deployment network during replication.
+
+**Step 2: Create a new `private` network. Take note of the network ID: `nwid`
+
+**Step 3: Follow the instructions from the [hellonode](ttp://kubernetes.io/docs/hellonode/) tutorial and set up your development system (install Google Cloud SDK).
+
+
+
+
+## Construct docker container
+
+Step 4: Create necessary files for inclusion in Dockerfile
+ - `mkdir ztkube`
+
+### Add the following files to the `ztkube` directory. These files will be compiled into the Docker image.
+
+
+Create an empty file to specify the private deployment network you created in *Step 2*:
+ - `<nwid>.conf`
+
+ - The `entrypoint.sh` script will start the ZeroTier service in the VM, attempt to join your deployment network and automatically authorize the new VM if your network is set to private.
+
+```
+./zerotier 
+zerotier-cli join $(NWID).conf
+zerotier-cli net-auth $(NWID) $(DEVID)
+```
+
+The cli tool config `.zerotierCliSettings`, this should contain your API keys to authorize new devices on your network. In this example the default controller is hosted by us at [my.zerotier.com](https://www.my.zerotier.com). YOu can host your own network controller and you'll need to modify the cli config accordingly:
+
+```
+{
+  "configVersion": 1,
+  "defaultCentral": "@my.zerotier.com",
+  "defaultController": "@my.zerotier.com",
+  "defaultOne": "@local",
+  "things": {
+    "local": {
+      "auth": "XXXXXXXXXXXXXXXXXXXXXXXX",
+      "type": "one",
+      "url": "http://127.0.0.1:9993/"
+    },
+    "my.zerotier.com": {
+      "auth": "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
+      "type": "central",
+      "url": "https://my.zerotier.com/"
+    },
+  }
+}
+```
+
+
+
+`Dockerfile`
+
+```
+FROM node:4.4
+EXPOSE 8080
+COPY server.js .
+COPY zerotier .
+COPY zerotier-cli .
+COPY entrypoint.sh .
+COPY .zerotierCliSettings <settings path>?>
+CMD node server.js
+```
+
+Step 5: Lastly, build the image:
+`docker build -t gcr.io/$PROJECT_ID/hello-node .`
+
+Step 6: Build and push the docker image to your *Container Registry*
+
+`gcloud docker push gcr.io/$PROJECT_ID/hello-node:v1`
+
+Step 7: Create Kubernetes Cluster
+`gcloud config set compute/zone us-central1-a`
+`gcloud container clusters create hello-world`
+`gcloud container clusters get-credentials hello-world`
+
+Step 8: Create your pod
+`kubectl run hello-node --image=gcr.io/$PROJECT_ID/hello-node:v1 --port=8080`
+
+Step 9: Scale
+`kubectl scale deployment hello-node --replicas=4`
+
+Now, after a minute or so you can use `zerotier-cli net-members <nwid>` to show all of your VM instances on your ZeroTier deployment network. If you haven't configured your local CLI, you can simply log into [my.zerotier.com](https://my.zerotier.com), go to *Networks -> <nwid>*.