Examples/rethinkdb fixes - namespaces, api update, curl params
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Marcin Wielgus
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@ -10,16 +10,10 @@ Setting up a [rethinkdb](http://rethinkdb.com/) cluster on [kubernetes](http://k
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Quick start
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-----------
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**Step 0**
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change the namespace of the current context to "rethinkdb"
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```
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$kubectl config view -o template --template='{{index . "current-context"}}' | xargs -I {} kubectl config set-context {} --namespace=rethinkdb
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```
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**Step 1**
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antmanler/rethinkdb will discover peer using endpoints provided by kubernetes_ro service,
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Rethinkdb will discover peer using endpoints provided by kubernetes service,
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so first create a service so the following pod can query its endpoint
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```shell
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@ -29,8 +23,9 @@ $kubectl create -f driver-service.yaml
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check out:
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```shell
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$kubectl get se
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$kubectl get services
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NAME LABELS SELECTOR IP(S) PORT(S)
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[...]
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rethinkdb-driver db=influxdb db=rethinkdb 10.0.27.114 28015/TCP
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```
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@ -47,10 +42,10 @@ Actually, you can start servers as many as you want at one time, just modify the
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check out again:
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```shell
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$kubectl get po
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POD IP CONTAINER(S) IMAGE(S) HOST LABELS STATUS CREATED MESSAGE
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rethinkdb-rc-1.16.0-6odi0 kubernetes-minion-s59e/ db=rethinkdb,role=replicas Pending 11 seconds
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rethinkdb antmanler/rethinkdb:1.16.0
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$kubectl get pods
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NAME READY REASON RESTARTS AGE
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[...]
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rethinkdb-rc-r4tb0 1/1 Running 0 1m
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```
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**Done!**
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@ -65,16 +60,15 @@ You can scale up you cluster using `kubectl scale`, and new pod will join to exs
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```shell
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$kubectl scale rc rethinkdb-rc-1.16.0 --replicas=3
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$kubectl scale rc rethinkdb-rc --replicas=3
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scaled
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$kubectl get po
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POD IP CONTAINER(S) IMAGE(S) HOST LABELS STATUS CREATED MESSAGE
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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
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rethinkdb antmanler/rethinkdb:1.16.0 Running About a minute
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rethinkdb-rc-1.16.0-e3mxv kubernetes-minion-d7ub/ db=rethinkdb,role=replicas Pending 6 seconds
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rethinkdb antmanler/rethinkdb:1.16.0
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rethinkdb-rc-1.16.0-manu6 kubernetes-minion-cybz/ db=rethinkdb,role=replicas Pending 6 seconds
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rethinkdb antmanler/rethinkdb:1.16.0
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$kubectl get pods
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NAME READY REASON RESTARTS AGE
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[...]
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rethinkdb-rc-f32c5 1/1 Running 0 1m
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rethinkdb-rc-m4d50 1/1 Running 0 1m
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rethinkdb-rc-r4tb0 1/1 Running 0 3m
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```
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Admin
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@ -92,6 +86,7 @@ find the service
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```shell
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$kubectl get se
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NAME LABELS SELECTOR IP(S) PORT(S)
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[...]
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rethinkdb-admin db=influxdb db=rethinkdb,role=admin 10.0.131.19 8080/TCP
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104.197.19.120
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rethinkdb-driver db=influxdb db=rethinkdb 10.0.27.114 28015/TCP
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@ -124,8 +119,6 @@ since the ui is not stateless when playing with Web Admin UI will cause `Connect
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**BTW**
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* All services and pods are placed under namespace `rethinkdb`.
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* `gen_pod.sh` is using to generate pod templates for my local cluster,
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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)
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@ -4,12 +4,16 @@ metadata:
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labels:
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db: rethinkdb
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role: admin
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name: rethinkdb-admin-1.16.0
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namespace: rethinkdb
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name: rethinkdb-admin
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spec:
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containers:
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- image: antmanler/rethinkdb:1.16.0
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- image: gcr.io/google_containers/rethinkdb:1.16.0_1
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name: rethinkdb
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env:
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- name: POD_NAMESPACE
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valueFrom:
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fieldRef:
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fieldPath: metadata.namespace
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ports:
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- containerPort: 8080
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name: admin-port
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@ -4,7 +4,6 @@ metadata:
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labels:
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db: influxdb
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name: rethinkdb-admin
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namespace: rethinkdb
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spec:
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ports:
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- port: 8080
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@ -4,7 +4,6 @@ metadata:
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labels:
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db: influxdb
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name: rethinkdb-driver
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namespace: rethinkdb
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spec:
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ports:
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- port: 28015
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@ -11,4 +11,4 @@ RUN apt-get update && \
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COPY ./run.sh /usr/bin/run.sh
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RUN chmod u+x /usr/bin/run.sh
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CMD ["/usr/bin/run.sh"]
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CMD "/usr/bin/run.sh"
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@ -16,14 +16,21 @@
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set -o pipefail
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echo Checking for other nodes
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IP=""
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if [[ -n "${KUBERNETES_RO_SERVICE_HOST}" ]]; then
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if [[ -n "${KUBERNETES_SERVICE_HOST}" ]]; then
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: ${NAMESPACE:=rethinkdb}
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# try to pick up first different ip from endpoints
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POD_NAMESPACE=${POD_NAMESPACE:-default}
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MYHOST=$(ip addr | grep 'state UP' -A2 | tail -n1 | awk '{print $2}' | cut -f1 -d'/')
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URL="${KUBERNETES_RO_SERVICE_HOST}/api/v1/namespaces/${NAMESPACE}/endpoints/rethinkdb-driver"
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IP=$(curl -s ${URL} | jq -s -r --arg h "${MYHOST}" '.[0].subsets | .[].addresses | [ .[].IP ] | map(select(. != $h)) | .[0]') || exit 1
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echo My host: ${MYHOST}
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URL="https://${KUBERNETES_SERVICE_HOST}:${KUBERNETES_SERVICE_PORT}/api/v1/namespaces/${POD_NAMESPACE}/endpoints/rethinkdb-driver"
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echo "Endpont url: ${URL}"
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echo "Looking for IPs..."
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token=$(cat /var/run/secrets/kubernetes.io/serviceaccount/token)
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# try to pick up first different ip from endpoints
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IP=$(curl -s ${URL} --cacert /var/run/secrets/kubernetes.io/serviceaccount/ca.crt --header "Authorization: Bearer ${token}" \
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| jq -s -r --arg h "${MYHOST}" '.[0].subsets | .[].addresses | [ .[].ip ] | map(select(. != $h)) | .[0]') || exit 1
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[[ "${IP}" == null ]] && IP=""
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fi
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@ -3,8 +3,7 @@ kind: ReplicationController
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metadata:
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labels:
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db: rethinkdb
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name: rethinkdb-rc-1.16.0
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namespace: rethinkdb
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name: rethinkdb-rc
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spec:
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replicas: 1
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selector:
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@ -17,8 +16,13 @@ spec:
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role: replicas
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spec:
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containers:
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- image: antmanler/rethinkdb:1.16.0
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- image: gcr.io/google_containes/rethinkdb:1.16.0_1
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name: rethinkdb
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env:
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- name: POD_NAMESPACE
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valueFrom:
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fieldRef:
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fieldPath: metadata.namespace
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ports:
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- containerPort: 8080
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name: admin-port
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