<a id="co-manage-flink-environments"></a>

# Manage Flink Environments Using Confluent for Kubernetes

A Apache Flink® environment is a set of configurations that Flink applications and SQL
statements share. After you create an environment, you can deploy Flink
applications or run Flink SQL statements against it.

* [Manage Flink Applications](co-manage-flink.md)
* [Manage Flink SQL](co-manage-flink-sql.md)

<a id="co-flink-environment"></a>

## Create a Flink environment

A Flink environment is a set of configurations that Flink applications and SQL
statements use.

The FlinkEnvironment specification supports the `computePoolDefaults`,
`kubernetesClusterName`, `secrets`, and `statementDefaults` fields, and
reports status information.

1. Create a FlinkEnvironment CR using the following specification, and deploy
   it with the `kubectl apply -f` command.
   ```yaml
   apiVersion: platform.confluent.io/v1beta1
   kind: FlinkEnvironment
   metadata:
     name:
     namespace:
   spec:
     kubernetesNamespace:      --- [1]
     flinkApplicationDefaults: --- [2]
       metadata:               --- [3]
       spec:                   --- [4]
         flinkConfiguration:
     cmfRestClassRef:          --- [5]
       name:
       namespace:
   ```

   * [1] The namespace of the Flink cluster.

     Typically, you would install the FlinkEnvironment CR in the CFK namespace
     (`metadata.namespace`), but the Flink cluster would be in another namespace
     (`spec.kubernetesNamespace`), for example, `default`.
   * [2] Configurations for the Flink cluster to specify the deployment-wide
     default application settings.
   * [3] Kubernetes API metadata.
   * [4] Spec of the FlinkApplicationSpec type.
   * [5] The reference to the REST Class you created in [Create a CMF REST Class](co-flink-overview.md#co-flink-rest-class).

     You can install FlinkEnvironment CR and the CMF REST class in different
     namespaces.

     If omitted, the CMFRestClass of the name `default` in the same namespace
     is used.

   An example FlinkEnvironment CR:
   ```yaml
   apiVersion: platform.confluent.io/v1beta1
   kind: FlinkEnvironment
   metadata:
     name: flink-env1
     namespace: operator
   spec:
     kubernetesNamespace: default
     flinkApplicationDefaults:
       metadata:
         labels:
           "acmecorp.com/owned-by": "analytics-team"
       spec:
         flinkConfiguration:
           taskmanager.numberOfTaskSlots: "2"
           rest.profiling.enabled: "true"
     cmfRestClassRef:
       name: default
       namespace: operator
   ```
2. Check the status.
   ```none
   kubectl get flinkEnvironment -n <namespace> -oyaml
   ```