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6.4. Getting started with service binding

The Service Binding Operator manages the data plane for workloads and backing services. This guide provides instructions with examples to help you create a database instance, deploy an application, and use the Service Binding Operator to create a binding connection between the application and the database service.

Prerequisites

  • You have access to an OpenShift Container Platform cluster using an account with cluster-admin permissions.
  • You have installed the oc CLI.
  • You have installed Service Binding Operator from OperatorHub.

  • You have installed the 5.1.2 version of the Crunchy Postgres for Kubernetes Operator from OperatorHub using the v5 Update channel. The installed Operator is available in an appropriate namespace, such as the my-petclinic namespace.

    참고

    You can create the namespace using the oc create namespace my-petclinic command.

  • You have installed the 5.1.2 version of the Crunchy Postgres for Kubernetes Operator from OperatorHub using the v5 Update channel. The installed Operator is available in an appropriate project, such as the my-petclinic project.

    참고

    You can create the project using the oc new-project my-petclinic command.

6.4.1. Creating a PostgreSQL database instance
링크 복사

To create a PostgreSQL database instance, you must create a PostgresCluster custom resource (CR) and configure the database.

Procedure

  1. Create the PostgresCluster CR in the my-petclinic namespace by running the following command in shell: 

    $ oc apply -n my-petclinic -f - << EOD
---
apiVersion: postgres-operator.crunchydata.com/v1beta1
kind: PostgresCluster
metadata:
  name: hippo
spec:
  image: registry.developers.crunchydata.com/crunchydata/crunchy-postgres:ubi8-14.4-0
  postgresVersion: 14
  instances:
    - name: instance1
      dataVolumeClaimSpec:
        accessModes:
        - "ReadWriteOnce"
        resources:
          requests:
            storage: 1Gi
  backups:
    pgbackrest:
      image: registry.developers.crunchydata.com/crunchydata/crunchy-pgbackrest:ubi8-2.38-0
      repos:
      - name: repo1
        volume:
          volumeClaimSpec:
            accessModes:
            - "ReadWriteOnce"
            resources:
              requests:
                storage: 1Gi
EOD

    The annotations added in this PostgresCluster CR enable the service binding connection and trigger the Operator reconciliation.

    The output verifies that the database instance is created:

    Example output

    postgrescluster.postgres-operator.crunchydata.com/hippo created

  2. After you have created the database instance, ensure that all the pods in the my-petclinic namespace are running: 

    $ oc get pods -n my-petclinic

    The output, which takes a few minutes to display, verifies that the database is created and configured:

    Example output

    NAME                                     READY    STATUS      RESTARTS   AGE
hippo-backup-9rxm-88rzq                   0/1     Completed   0          2m2s
hippo-instance1-6psd-0                    4/4     Running     0          3m28s
hippo-repo-host-0                         2/2     Running     0          3m28s

    After the database is configured, you can deploy the sample application and connect it to the database service.

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