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```console |
$ kubectl create -f guestbook-go/redis-replica-service.yaml |
``` |
2. To verify that the redis-replica service is up, list the services you created in the cluster with the `kubectl get services` command: |
```console |
$ kubectl get services |
NAME CLUSTER_IP EXTERNAL_IP PORT(S) SELECTOR AGE |
redis-master 10.0.136.3 <none> 6379/TCP app=redis,role=master 1h |
redis-replica 10.0.21.92 <none> 6379/TCP app-redis,role=replica 1h |
... |
``` |
Result: The service is created with labels `app=redis` and `role=replica` to identify that the pods are running the Redis replicas. |
Tip: It is helpful to set labels on your services themselves--as we've done here--to make it easy to locate them later. |
### Step Five: Create the guestbook pods <a id="step-five"></a> |
This is a simple Go `net/http` ([negroni](https://github.com/codegangsta/negroni) based) server that is configured to talk to either the replica or master services depending on whether the request is a read or a write. The pods we are creating expose a simple JSON interface and serves a jQuery-Ajax based UI. Like the R... |
1. Use the [guestbook-controller.yaml](guestbook-controller.yaml) file to create the guestbook replication controller by running the `kubectl create -f` *`filename`* command: |
```console |
$ kubectl create -f guestbook-go/guestbook-controller.yaml |
``` |
Tip: If you want to modify the guestbook code open the `_src` of this example and read the README.md and the Makefile. If you have pushed your custom image be sure to update the `image` accordingly in the guestbook-controller.yaml. |
2. To verify that the guestbook replication controller is running, run the `kubectl get rc` command: |
```console |
$ kubectl get rc |
CONTROLLER CONTAINER(S) IMAGE(S) SELECTOR REPLICAS |
guestbook guestbook registry.k8s.io/guestbook:v3 app=guestbook 3 |
redis-replica redis-replica registry.k8s.io/redis-replica:v2 app=redis,role=replica 2 |
... |
``` |
3. To verify that the guestbook pods are running (it might take up to thirty seconds to create the pods), list the pods you created in cluster with the `kubectl get pods` command: |
```console |
$ kubectl get pods |
NAME READY STATUS RESTARTS AGE |
guestbook-3crgn 1/1 Running 0 2m |
guestbook-gv7i6 1/1 Running 0 2m |
guestbook-x405a 1/1 Running 0 2m |
redis-master-5b97bdb85f-vvk28 1/1 Running 0 23m |
redis-replica-b6wj4 1/1 Running 0 6m |
redis-replica-iai40 1/1 Running 0 6m |
... |
``` |
Result: You see a single Redis master, two Redis replicas, and three guestbook pods. |
### Step Six: Create the guestbook service <a id="step-six"></a> |
Just like the others, we create a service to group the guestbook pods but this time, to make the guestbook front end externally visible, we specify `"type": "LoadBalancer"`. |
1. Use the [guestbook-service.yaml](guestbook-service.yaml) file to create the guestbook service by running the `kubectl create -f` *`filename`* command: |
```console |
$ kubectl create -f guestbook-go/guestbook-service.yaml |
``` |
2. To verify that the guestbook service is up, list the services you created in the cluster with the `kubectl get services` command: |
```console |
$ kubectl get services |
NAME CLUSTER_IP EXTERNAL_IP PORT(S) SELECTOR AGE |
guestbook 10.0.217.218 146.148.81.8 3000/TCP app=guestbook 1h |
redis-master 10.0.136.3 <none> 6379/TCP app=redis,role=master 1h |
redis-replica 10.0.21.92 <none> 6379/TCP app-redis,role=replica 1h |
... |
``` |
Result: The service is created with label `app=guestbook`. |
### Step Seven: View the guestbook <a id="step-seven"></a> |
You can now play with the guestbook that you just created by opening it in a browser (it might take a few moments for the guestbook to come up). |
* **Local Host:** |
If you are running Kubernetes locally, to view the guestbook, navigate to `http://localhost:3000` in your browser. |
* **Remote Host:** |
1. To view the guestbook on a remote host, locate the external IP of the load balancer in the **IP** column of the `kubectl get services` output. In our example, the internal IP address is `10.0.217.218` and the external IP address is `146.148.81.8` (*Note: you might need to scroll to see the IP column*). |
2. Append port `3000` to the IP address (for example `http://146.148.81.8:3000`), and then navigate to that address in your browser. |
Result: The guestbook displays in your browser: |
 |
**Further Reading:** |
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