$ odo login -u developer -p developer
Creating instances of services managed by Operators in `odo` is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process.
For more information about the support scope of Red Hat Technology Preview features, see https://access.redhat.com/support/offerings/techpreview/.
Operators are a method of packaging, deploying, and managing Kubernetes services. With
odo, you can create instances of services from the custom resource definitions (CRDs) provided by the Operators. You can then use these instances in your projects and link them to your components.
To create services from an Operator, you must ensure that the Operator has valid values defined in its
metadata to start the requested service.
odo uses the
metadata.annotations.alm-examples YAML file of an Operator to start
the service. If this YAML has placeholder values or sample values, a service cannot start. You can modify the YAML file and start the service with the modified values. To learn how to modify YAML files and start services from it, see Creating services from YAML files.
oc CLI and log into the cluster.
Note that the configuration of the cluster determines the services available to you. To access the Operator services, a cluster administrator must install the respective Operator on the cluster first. To learn more, see Adding Operators to the cluster.
Enable experimental mode. To enable experimental mode in
odo preference set Experimental true or use the environment variable
odo config set --env ODO_EXPERIMENTAL=true
Create a project to keep your source code, tests, and libraries organized in a separate single unit.
Log in to an OpenShift Container Platform cluster:
$ odo login -u developer -p developer
Create a project:
$ odo project create myproject ✓ Project 'myproject' is ready for use ✓ New project created and now using project : myproject
odo, you can display the list of the Operators installed on your cluster, and the services they provide.
To list the Operators installed in current project, run:
$ odo catalog list services
The command lists Operators and the CRDs. The output of the command shows the Operators installed on your cluster. For example:
Operators available in the cluster NAME CRDs etcdoperator.v0.9.4 EtcdCluster, EtcdBackup, EtcdRestore mongodb-enterprise.v1.4.5 MongoDB, MongoDBUser, MongoDBOpsManager
etcdoperator.v0.9.4 is the Operator,
EtcdRestore are the CRDs provided by the Operator.
If an Operator has valid values defined in its
metadata to start the requested service, you can use the service with
odo service create.
Print the YAML of the service as a file on your local drive:
$ oc get csv/etcdoperator.v0.9.4 -o yaml
Verify that the values of the service are valid:
apiVersion: etcd.database.coreos.com/v1beta2 kind: EtcdCluster metadata: name: example spec: size: 3 version: 3.2.13
EtcdCluster service from the
$ odo service create etcdoperator.v0.9.4 --crd EtcdCluster
Verify that a service has started:
$ oc get EtcdCluster
If the YAML definition of the service or custom resource (CR) has invalid or placeholder data, you can use the
--dry-run flag to get the YAML definition, specify the correct values, and start the service using the corrected YAML definition.
Printing and modifying the YAML used to start a service
odo provides the feature to print the YAML definition of the service or CR provided by the Operator before starting a service.
To display the YAML of the service, run:
$ odo service create <operator-name> --crd <cr-name> --dry-run
For example, to print YAML definition of
EtcdCluster provided by the
etcdoperator.v0.9.4 Operator, run:
$ odo service create etcdoperator.v0.9.4 --crd EtcdCluster --dry-run
The YAML is saved as the
apiVersion: etcd.database.coreos.com/v1beta2 kind: EtcdCluster metadata: name: my-etcd-cluster (1) spec: size: 1 (2) version: 3.2.13
|1||Change the name from
|2||Reduce the size from
Start a service from the YAML file:
$ odo service create --from-file etcd.yaml
Verify that the
EtcdCluster service has started with one pod instead of the pre-configured three pods:
$ oc get pods | grep my-etcd-cluster