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update example/rethinkdb to v1beta3

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add external load balancer to work on GCE

add a comment about nodeSelector in gen-pod.sh

update the image/run.sh to v1beta3
This commit is contained in:
Chao Xu
2015-05-07 15:44:58 -07:00
parent 0da12c1ba9
commit 25cca64c12
12 changed files with 155 additions and 320 deletions
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56
examples/rethinkdb/README.md
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@@ -10,6 +10,12 @@ Setting up a [rethinkdb](http://rethinkdb.com/) cluster on [kubernetes](http://k
Quick start
-----------
**Step 0**
change the namespace of the current context to "rethinkdb"
```
$kubectl config view -o template --template='{{index . "current-context"}}' | xargs -I {} kubectl config set-context {} --namespace=rethinkdb
```
**Step 1**
@@ -17,15 +23,15 @@ antmanler/rethinkdb will discover peer using endpoints provided by kubernetes_ro
so first create a service so the following pod can query its endpoint
```shell
kubectl create -f driver-service.yaml
$kubectl create -f driver-service.yaml
```
check out:
```shell
$kubectl get se
NAME LABELS SELECTOR IP PORT
rethinkdb-driver db=influxdb db=rethinkdb 10.241.105.47 28015
NAME LABELS SELECTOR IP(S) PORT(S)
rethinkdb-driver db=influxdb db=rethinkdb 10.0.27.114 28015/TCP
```
**Step 2**
@@ -33,7 +39,7 @@ rethinkdb-driver db=influxdb db=rethinkdb 10.241.105.47
start fist server in cluster
```shell
kubectl create -f rc.yaml
$kubectl create -f rc.yaml
```
Actually, you can start servers as many as you want at one time, just modify the `replicas` in `rc.ymal`
@@ -42,8 +48,9 @@ check out again:
```shell
$kubectl get po
POD IP CONTAINER(S) IMAGE(S) HOST LABELS STATUS
99f6d361-abd6-11e4-a1ea-001c426dbc28 10.240.2.68 rethinkdb rethinkdb:1.16.0 10.245.2.2/ db=rethinkdb,role=replicas Running
POD IP CONTAINER(S) IMAGE(S) HOST LABELS STATUS CREATED MESSAGE
rethinkdb-rc-1.16.0-6odi0 kubernetes-minion-s59e/ db=rethinkdb,role=replicas Pending 11 seconds
rethinkdb antmanler/rethinkdb:1.16.0
```
**Done!**
@@ -61,10 +68,13 @@ You can scale up you cluster using `kubectl resize`, and new pod will join to ex
$kubectl resize rc rethinkdb-rc-1.16.0 --replicas=3
resized
$kubectl get po
POD IP CONTAINER(S) IMAGE(S) HOST LABELS STATUS
99f6d361-abd6-11e4-a1ea-001c426dbc28 10.240.2.68 rethinkdb rethinkdb:1.16.0 10.245.2.2/ db=rethinkdb,role=replicas Running
d10182b5-abd6-11e4-a1ea-001c426dbc28 10.240.26.14 rethinkdb rethinkdb:1.16.0 10.245.2.4/ db=rethinkdb,role=replicas Running
d101c1a4-abd6-11e4-a1ea-001c426dbc28 10.240.11.14 rethinkdb rethinkdb:1.16.0 10.245.2.3/ db=rethinkdb,role=replicas Running
POD IP CONTAINER(S) IMAGE(S) HOST LABELS STATUS CREATED MESSAGE
rethinkdb-rc-1.16.0-6odi0 10.244.3.3 kubernetes-minion-s59e/104.197.79.42 db=rethinkdb,role=replicas Running About a minute
rethinkdb antmanler/rethinkdb:1.16.0 Running About a minute
rethinkdb-rc-1.16.0-e3mxv kubernetes-minion-d7ub/ db=rethinkdb,role=replicas Pending 6 seconds
rethinkdb antmanler/rethinkdb:1.16.0
rethinkdb-rc-1.16.0-manu6 kubernetes-minion-cybz/ db=rethinkdb,role=replicas Pending 6 seconds
rethinkdb antmanler/rethinkdb:1.16.0
```
Admin
@@ -81,12 +91,28 @@ find the service
```shell
$kubectl get se
NAME LABELS SELECTOR IP PORT
rethinkdb-admin db=influxdb db=rethinkdb,role=admin 10.241.220.209 8080
rethinkdb-driver db=influxdb db=rethinkdb 10.241.105.47 28015
NAME LABELS SELECTOR IP(S) PORT(S)
rethinkdb-admin db=influxdb db=rethinkdb,role=admin 10.0.131.19 8080/TCP
104.197.19.120
rethinkdb-driver db=influxdb db=rethinkdb 10.0.27.114 28015/TCP
```
open a web browser and access to *http://10.241.220.209:8080* to manage you cluster
We request for an external load balancer in the admin-service.yaml file:
```
createExternalLoadBalancer: true
```
The external load balancer allows us to access the service from outside via an external IP, which is 104.197.19.120 in this case.
Note that you may need to create a firewall rule to allow the traffic, assuming you are using GCE:
```
$ gcloud compute firewall-rules create rethinkdb --allow=tcp:8080
```
Now you can open a web browser and access to *http://104.197.19.120:8080* to manage your cluster.
**Why not just using pods in replicas?**
@@ -101,6 +127,6 @@ since the ui is not stateless when playing with Web Admin UI will cause `Connect
* All services and pods are placed under namespace `rethinkdb`.
* `gen_pod.sh` is using to generate pod templates for my local cluster,
the generated pods which is using `nodeSelector` to force k8s to schedule containers to my designate nodes, for I need to access persistent data on my host dirs.
the generated pods which is using `nodeSelector` to force k8s to schedule containers to my designate nodes, for I need to access persistent data on my host dirs. Note that one needs to label the node before 'nodeSelector' can work, see this [tutorial](https://github.com/GoogleCloudPlatform/kubernetes/tree/master/examples/node-selection)
* see [antmanler/rethinkdb-k8s](https://github.com/antmanler/rethinkdb-k8s) for detail