Installing Greenplum for Kubernetes

This topic describes how to install Pivotal Greenplum for Kubernetes. The installation process involves loading the Greenplum for Kubernetes container images into your container registry, and then using the helm package manager to install the Greenplum Operator resource in Kubernetes. After the Greenplum Operator resource is available, you can interact with it to deploy and manage Greenplum clusters in Kubernetes.

Prerequisites

Before you install Greenplum for Kubernetes, ensure that you have installed all required software and prepared your Kubernetes environment as described in Prerequisites.

Procedure

Follow these steps to download and install the Greenplum for Kubernetes container images, and install the Greenplum Operator resource.

Download the Greenplum for Kubernetes software from Pivotal Network. The download file has the name: greenplum-for-kubernetes-<version>.tar.gz.
Go to the directory where you downloaded Greenplum for Kubernetes, and unpack the downloaded software. For example:
```
$ cd ~/Downloads
$ tar xzf greenplum-for-kubernetes-*.tar.gz
```
The above command unpacks the distribution into a new directory named greenplum-for-kubernetes-<version>.
Go into the new greenplum-for-kubernetes-<version> directory:
```
$ cd ./greenplum-for-kubernetes-*
```
(This step is for Minikube deployments only.) Ensure that the local docker daemon interacts with the Minikube docker container registry:
```
$ eval $(minikube docker-env)
```
Note: To undo this docker setting in the current shell, run eval "$(docker-machine env -u)".

Load the Greenplum for Kubernetes Docker image to the local Docker registry:

$ docker load -i ./images/greenplum-for-kubernetes

91d23cf5425a: Loading layer [==================================================>]  127.3MB/127.3MB
f36b28e4310d: Loading layer [==================================================>]  11.78kB/11.78kB
6cb741cb00b7: Loading layer [==================================================>]  15.87kB/15.87kB
...
Loaded image: greenplum-for-kubernetes:v1.12.0

Load the Greenplum Operator Docker image to the Docker registry:

$ docker load -i ./images/greenplum-operator

33c58014b5a4: Loading layer [==================================================>]   65.5MB/65.5MB
a1eabe7eb601: Loading layer [==================================================>]  40.65MB/40.65MB
511680a9987d: Loading layer [==================================================>]  41.01MB/41.01MB
Loaded image: greenplum-operator:v1.12.0

Verify that both Docker images are now available:

$ docker images "greenplum-*"

REPOSITORY                 TAG                 IMAGE ID            CREATED             SIZE
greenplum-operator         v1.12.0             852cafa7ac90        7 weeks ago         269MB
greenplum-for-kubernetes   v1.12.0             3819d17a577a        7 weeks ago         3.05GB

(Skip this step if you are using local docker images such as on Minikube.) If you want to push the Greenplum for Kubernetes docker images to a different container registry:

Set the project name and image repo name and then use Docker to push the images. For example, to push the images to Google Cloud Registry using the current Google Cloud project name:

$ gcloud auth configure-docker

$ PROJECT=$(gcloud config list core/project --format='value(core.project)')
$ IMAGE_REPO="gcr.io/${PROJECT}"

$ GREENPLUM_IMAGE_NAME="${IMAGE_REPO}/greenplum-for-kubernetes:$(cat ./images/greenplum-for-kubernetes-tag)"
$ docker tag $(cat ./images/greenplum-for-kubernetes-id) ${GREENPLUM_IMAGE_NAME}
$ docker push ${GREENPLUM_IMAGE_NAME}

$ OPERATOR_IMAGE_NAME="${IMAGE_REPO}/greenplum-operator:$(cat ./images/greenplum-operator-tag)"
$ docker tag $(cat ./images/greenplum-operator-id) ${OPERATOR_IMAGE_NAME}
$ docker push ${OPERATOR_IMAGE_NAME}

Create a docker-registry secret regsecret for pods to be able to fetch images from remote container registries. For example:

# For GCR
kubectl create secret  docker-registry  regsecret \
--docker-server=https://gcr.io \
--docker-username=_json_key \
--docker-password="$(cat key.json)"

#For ECR
TOKEN=`aws ecr --region=$REGION get-authorization-token --output text --query authorizationData[].authorizationToken | base64 -d | cut -d: -f2`
kubectl create secret docker-registry regsecret \
--docker-server=https://${ACCOUNT}.dkr.ecr.${REGION}.amazonaws.com \
--docker-username=AWS \
--docker-password="${TOKEN}"

#For Harbor
kubectl create secret docker-registry regsecret \
--docker-server=${HARBOR_URL} \
--docker-username=${HARBOR_USER} \
--docker-password="${HARBOR_PASSWORD}"

Verify the regsecret.
```
./workspace/samples/scripts/regsecret-test.bash ${OPERATOR_IMAGE_NAME}
```
The output of above command should print GREENPLUM-OPERATOR TEST OK If this verification fails for Google Cloud Registry, then make sure the key.json file has the roles/storage.objectViewer role.
If you pushed the Greenplum Operator and Greenplum Database Docker images to a container registry, create a new YAML file in the workspace subdirectory with two lines to indicate the registry where you pushed the images. For example, if you are using Google Cloud Registry you would add properties similar to:
```
cat <<EOF >workspace/operator-values-overrides.yaml
operatorImageRepository: ${IMAGE_REPO}/greenplum-operator
greenplumImageRepository: ${IMAGE_REPO}/greenplum-for-kubernetes
EOF
```
Be sure to replace the project and repository names with the actual names used in your deployment.

Note: If you did not tag the images with a container registry prefix or project name (for example, if you are using your own local Minikube deployment), then you can skip this step.

(Optional.) If you want to use a non-default logging level (for example, to enable debug logging), then follow the instructions in Enabling Debug Logging.
(Optional.) If you want to specify a node for the operator to run on, first apply a label to the node.
```
kubectl label node <node name> <key>=<value>
```
Then, edit the operator-values-overrides.yaml file to include a matching set of key/value label selectors:
```
operatorWorkerSelector: {
  <key>: "<value>"
  [ ... ]
}
```
See the documentation on the manifest’s workerSelector attribute for more information on how Greenplum for Kubernetes handles label selectors.
Use helm to create a new Greenplum Operator release, specifying the YAML configuration file if you created one. For example, to create a new release with the name “greenplum-operator”:
```
$ helm install greenplum-operator -f workspace/operator-values-overrides.yaml operator/
```
If you did not create a YAML configuration file (as in the case with Minikube) omit the -f option:
```
$ helm install greenplum-operator operator/
```
Helm begins installing the new release into the Kubernetes namespace specified in the current Kubernetes context. If you want to install into a different namespace, include the --namespace option in the helm command.

The command displays the following message and concludes with a link to this documentation:
```
NAME: greenplum-operator
LAST DEPLOYED: Wed Feb 12 10:39:03 2020
NAMESPACE: default
STATUS: deployed
REVISION: 1
TEST SUITE: None
NOTES:
greenplum-operator has been installed.

Please see documentation at:
http://greenplum-kubernetes.docs.pivotal.io/
deployment.apps/greenplum-operator condition met
```

Use watch kubectl get all to monitor the progress of the deployment. The deployment is complete when the Greenplum Operator pod is in the Running state and the replica set are available. For example:

$ watch kubectl get all

NAME                                      READY   STATUS    RESTARTS   AGE
pod/greenplum-operator-667ccc59fd-x7dw7   1/1     Running   0          33s

NAME                                                            TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)   AGE
service/greenplum-validating-webhook-service-667ccc59fd-x7dw7   ClusterIP   10.105.146.151   <none>        443/TCP   32s
service/kubernetes                                              ClusterIP   10.96.0.1        <none>        443/TCP   6m44s

NAME                                 READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/greenplum-operator   1/1     1            1           33s

NAME                                            DESIRED   CURRENT   READY   AGE
replicaset.apps/greenplum-operator-667ccc59fd   1         1         1       33s

Check the logs of the operator to ensure that it is running properly.

$ kubectl logs -l app=greenplum-operator

time="2020-02-12T18:39:04Z" level=info msg="starting greenplum validating admission webhook server"
2020-02-12T18:39:04.497Z    INFO    controller-runtime.metrics  metrics server is starting to listen    {"addr": ":8080"}
2020-02-12T18:39:04.497Z    INFO    controller-runtime.controller   Starting EventSource    {"controller": "greenplumtextservice", "source":    "kind source: /, Kind="}
2020-02-12T18:39:04.498Z    INFO    controller-runtime.controller   Starting EventSource    {"controller": "greenplumpxfservice", "source":     "kind source: /, Kind="}
2020-02-12T18:39:04.498Z    INFO    setup   starting manager
2020-02-12T18:39:04.498Z    INFO    controller-runtime.manager  starting metrics server {"path": "/metrics"}
2020-02-12T18:39:04.599Z    INFO    controller-runtime.controller   Starting Controller {"controller": "greenplumtextservice"}
2020-02-12T18:39:04.599Z    INFO    controller-runtime.controller   Starting Controller {"controller": "greenplumpxfservice"}
2020-02-12T18:39:04.699Z    INFO    controller-runtime.controller   Starting workers    {"controller": "greenplumpxfservice", "worker   count": 1}
2020-02-12T18:39:04.699Z    INFO    controller-runtime.controller   Starting workers    {"controller": "greenplumtextservice", "worker  count": 1}

At this point, you can interact with the Greenplum Operator to deploy new Greenplum clusters or manage existing Greenplum clusters. See About the Greenplum Operator.