Merge pull request #10832 from mwielgus/rethinkdb

Examples/rethinkdb fixes - namespaces, api update, curl params

examples/rethinkdb/README.md

@@ -10,16 +10,10 @@ 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**
 
-antmanler/rethinkdb will discover peer using endpoints provided by kubernetes_ro service,
+Rethinkdb will discover peer using endpoints provided by kubernetes service,
 so first create a service so the following pod can query its endpoint
 
 ```shell
@@ -29,8 +23,9 @@ $kubectl create -f driver-service.yaml
 check out:
 
 ```shell
-$kubectl get se
+$kubectl get services
 NAME               LABELS        SELECTOR       IP(S)         PORT(S)
+[...]
 rethinkdb-driver   db=influxdb   db=rethinkdb   10.0.27.114   28015/TCP
 ```
 
@@ -47,10 +42,10 @@ Actually, you can start servers as many as you want at one time, just modify the
 check out again:
 
 ```shell
-$kubectl get po
+$kubectl get pods
-POD                         IP        CONTAINER(S)   IMAGE(S)                     HOST                      LABELS                       STATUS    CREATED      MESSAGE
+NAME                                                  READY     REASON    RESTARTS   AGE
-rethinkdb-rc-1.16.0-6odi0                                                         kubernetes-minion-s59e/   db=rethinkdb,role=replicas   Pending   11 seconds
+[...]
-                                      rethinkdb      antmanler/rethinkdb:1.16.0
+rethinkdb-rc-r4tb0                                    1/1       Running   0          1m
 ```
 
 **Done!**
@@ -65,16 +60,15 @@ You can scale up you cluster using `kubectl scale`, and new pod will join to exs
 
 
 ```shell
-$kubectl scale rc rethinkdb-rc-1.16.0 --replicas=3
+$kubectl scale rc rethinkdb-rc --replicas=3
 scaled
-$kubectl get po
+
-POD                         IP           CONTAINER(S)   IMAGE(S)                     HOST                                   LABELS                       STATUS    CREATED          MESSAGE
+$kubectl get pods
-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
+NAME                                                  READY     REASON    RESTARTS   AGE
-                                         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-rc-f32c5                                    1/1       Running   0          1m
-                                         rethinkdb      antmanler/rethinkdb:1.16.0
+rethinkdb-rc-m4d50                                    1/1       Running   0          1m
-rethinkdb-rc-1.16.0-manu6                                                            kubernetes-minion-cybz/                db=rethinkdb,role=replicas   Pending   6 seconds
+rethinkdb-rc-r4tb0                                    1/1       Running   0          3m
-                                         rethinkdb      antmanler/rethinkdb:1.16.0
 ```
 
 Admin
@@ -92,6 +86,7 @@ find the service
 ```shell
 $kubectl get se
 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
@@ -124,8 +119,6 @@ since the ui is not stateless when playing with Web Admin UI will cause `Connect
 
 **BTW**
 
-  * 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. Note that one needs to label the node before 'nodeSelector' can work, see this [tutorial](../node-selection/)
 

examples/rethinkdb/admin-pod.yaml

@@ -4,12 +4,16 @@ metadata:
   labels:
     db: rethinkdb
     role: admin
-  name: rethinkdb-admin-1.16.0
+  name: rethinkdb-admin
-  namespace: rethinkdb
 spec:
   containers:
-  - image: antmanler/rethinkdb:1.16.0
+  - image: gcr.io/google_containers/rethinkdb:1.16.0_1
     name: rethinkdb
+    env:
+    - name: POD_NAMESPACE
+      valueFrom:
+        fieldRef:
+          fieldPath: metadata.namespace
     ports:
     - containerPort: 8080
       name: admin-port

examples/rethinkdb/admin-service.yaml

@@ -4,7 +4,6 @@ metadata:
   labels:
     db: influxdb
   name: rethinkdb-admin
-  namespace: rethinkdb
 spec:
   ports:
    - port: 8080

examples/rethinkdb/driver-service.yaml

@@ -4,7 +4,6 @@ metadata:
   labels:
     db: influxdb
   name: rethinkdb-driver
-  namespace: rethinkdb
 spec:
   ports:
     - port: 28015

examples/rethinkdb/image/Dockerfile

@@ -11,4 +11,4 @@ RUN apt-get update && \
 COPY ./run.sh /usr/bin/run.sh
 RUN chmod u+x /usr/bin/run.sh
 
-CMD ["/usr/bin/run.sh"]
+CMD "/usr/bin/run.sh"

examples/rethinkdb/image/run.sh

@@ -16,14 +16,21 @@
 
 set -o pipefail
 
+echo Checking for other nodes
 IP=""
-if [[ -n "${KUBERNETES_RO_SERVICE_HOST}" ]]; then
+if [[ -n "${KUBERNETES_SERVICE_HOST}" ]]; then
 
-  : ${NAMESPACE:=rethinkdb}
+  POD_NAMESPACE=${POD_NAMESPACE:-default}
-  # try to pick up first different ip from endpoints
   MYHOST=$(ip addr | grep 'state UP' -A2 | tail -n1 | awk '{print $2}' | cut -f1  -d'/')
-  URL="${KUBERNETES_RO_SERVICE_HOST}/api/v1/namespaces/${NAMESPACE}/endpoints/rethinkdb-driver"
+  echo My host: ${MYHOST}
-  IP=$(curl -s ${URL} | jq -s -r --arg h "${MYHOST}" '.[0].subsets | .[].addresses | [ .[].IP ] | map(select(. != $h)) | .[0]') || exit 1
+
+  URL="https://${KUBERNETES_SERVICE_HOST}:${KUBERNETES_SERVICE_PORT}/api/v1/namespaces/${POD_NAMESPACE}/endpoints/rethinkdb-driver"
+  echo "Endpont url: ${URL}"
+  echo "Looking for IPs..."
+  token=$(cat /var/run/secrets/kubernetes.io/serviceaccount/token)  
+  # try to pick up first different ip from endpoints
+  IP=$(curl -s ${URL} --cacert /var/run/secrets/kubernetes.io/serviceaccount/ca.crt --header "Authorization: Bearer ${token}" \
+    | jq -s -r --arg h "${MYHOST}" '.[0].subsets | .[].addresses | [ .[].ip ] | map(select(. != $h)) | .[0]') || exit 1
   [[ "${IP}" == null ]] && IP=""
 fi
 

examples/rethinkdb/rc.yaml

@@ -3,8 +3,7 @@ kind: ReplicationController
 metadata:
   labels:
     db: rethinkdb
-  name: rethinkdb-rc-1.16.0
+  name: rethinkdb-rc
-  namespace: rethinkdb
 spec:
   replicas: 1
   selector:
@@ -17,8 +16,13 @@ spec:
         role: replicas
     spec:
       containers:
-      - image: antmanler/rethinkdb:1.16.0
+      - image: gcr.io/google_containes/rethinkdb:1.16.0_1
         name: rethinkdb
+        env:
+        - name: POD_NAMESPACE
+          valueFrom:
+            fieldRef:
+              fieldPath: metadata.namespace
         ports:
         - containerPort: 8080
           name: admin-port