Operator configuration v1

The operator for EDB Postgres for Kubernetes is installed from a standard deployment manifest and follows the convention over configuration paradigm. While this is fine in most cases, there are some scenarios where you want to change the default behavior, such as:

  • setting a company license key that is shared by all deployments managed by the operator
  • defining annotations and labels to be inherited by all resources created by the operator and that are set in the cluster resource
  • defining a different default image for PostgreSQL or an additional pull secret

By default, the operator is installed in the postgresql-operator-system namespace as a Kubernetes Deployment called postgresql-operator-controller-manager.

Note

In the examples below we assume the default name and namespace for the operator deployment.

The behavior of the operator can be customized through a ConfigMap/Secret that is located in the same namespace of the operator deployment and with postgresql-operator-controller-manager-config as the name.

Important

Any change to the config's ConfigMap/Secret will not be automatically detected by the operator, - and as such, it needs to be reloaded (see below). Moreover, changes only apply to the resources created after the configuration is reloaded.

Important

The operator first processes the ConfigMap values and then the Secret’s, in this order. As a result, if a parameter is defined in both places, the one in the Secret will be used.

Available options

The operator looks for the following environment variables to be defined in the ConfigMap/Secret:

NameDescription
EDB_LICENSE_KEYdefault license key (to be used only if the cluster does not define one, and preferably in the Secret)
ENABLE_REDWOOD_BY_DEFAULTEnable the Redwood compatibility by default when using EPAS.
INHERITED_ANNOTATIONSlist of annotation names that, when defined in a Cluster metadata, will be inherited by all the generated resources, including pods
INHERITED_LABELSlist of label names that, when defined in a Cluster metadata, will be inherited by all the generated resources, including pods
PULL_SECRET_NAMEname of an additional pull secret to be defined in the operator's namespace and to be used to download images
ENABLE_AZURE_PVC_UPDATESEnables to delete Postgres pod if its PVC is stuck in Resizing condition. This feature is mainly for the Azure environment (default false)
ENABLE_INSTANCE_MANAGER_INPLACE_UPDATESwhen set to true, enables in-place updates of the instance manager after an update of the operator, avoiding rolling updates of the cluster (default false)
MONITORING_QUERIES_CONFIGMAPThe name of a ConfigMap in the operator's namespace with a set of default queries (to be specified under the key queries) to be applied to all created Clusters
MONITORING_QUERIES_SECRETThe name of a Secret in the operator's namespace with a set of default queries (to be specified under the key queries) to be applied to all created Clusters

Values in INHERITED_ANNOTATIONS and INHERITED_LABELS support path-like wildcards. For example, the value example.com/* will match both the value example.com/one and example.com/two.

When you specify an additional pull secret name using the PULL_SECRET_NAME parameter, the operator will use that secret to create a pull secret for every created PostgreSQL cluster. That secret will be named <cluster-name>-pull.

The namespace where the operator looks for the PULL_SECRET_NAME secret is where you installed the operator. If the operator is not able to find that secret, it will ignore the configuration parameter.

Warning

Previous versions of the operator copied the PULL_SECRET_NAME secret inside the namespaces where you deploy the PostgreSQL clusters. From version "1.11.0" the behavior changed to match the previous description. The pull secrets created by the previous versions of the operator are unused.

Defining an operator config map

The example below customizes the behavior of the operator, by defining a default license key (namely a company key), the label/annotation names to be inherited by the resources created by any Cluster object that is deployed at a later time, and by enabling in-place updates for the instance manager.

apiVersion: v1
kind: ConfigMap
metadata:
  name: postgresql-operator-controller-manager-config
  namespace: postgresql-operator-system
data:
  INHERITED_ANNOTATIONS: categories
  INHERITED_LABELS: environment, workload, app
  ENABLE_INSTANCE_MANAGER_INPLACE_UPDATES: 'true'

Defining an operator secret

The example below customizes the behavior of the operator, by defining a default license key.

apiVersion: v1
kind: Secret
metadata:
  name: postgresql-operator-controller-manager-config
  namespace: postgresql-operator-system
type: Opaque
data:
  EDB_LICENSE_KEY: <YOUR_BASE64_ENCODED_EDB_LICENSE_KEY_HERE>

Restarting the operator to reload configs

For the change to be effective, you need to recreate the operator pods to reload the config map. If you have installed the operator on Kubernetes using the manifest you can do that by issuing:

kubectl rollout restart deployment \
    -n postgresql-operator-system \
    postgresql-operator-controller-manager

Otherwise, If you have installed the operator using OLM, or you are running on Openshift, run the following command specifying the namespace the operator is installed in:

kubectl delete pods -n [NAMESPACE_NAME_HERE] \
  -l app.kubernetes.io/name=cloud-native-postgresql
Warning

Customizations will be applied only to Cluster resources created after the reload of the operator deployment.

Following the above example, if the Cluster definition contains a categories annotation and any of the environment, workload, or app labels, these will be inherited by all the resources generated by the deployment.

PPROF HTTP SERVER

The operator can expose a PPROF HTTP server with the following endpoints on localhost:6060:

- `/debug/pprof/`. Responds to a request for "/debug/pprof/" with an HTML page listing the available profiles
- `/debug/pprof/cmdline`. Responds with the running program's command line, with arguments separated by NUL bytes.
- `/debug/pprof/profile`. Responds with the pprof-formatted cpu profile. Profiling lasts for duration specified in seconds GET parameter, or for 30 seconds if not specified.
- `/debug/pprof/symbol`. Looks up the program counters listed in the request, responding with a table mapping program counters to function names.
- `/debug/pprof/trace`. Responds with the execution trace in binary form.  Tracing lasts for duration specified in seconds GET parameter, or for 1 second if not specified.

To enable the operator you need to edit the operator deployment add the flag --pprof-server=true.

You can do this by executing these commands:

kubectl edit deployment -n postgresql-operator-system postgresql-operator-controller-manager 

Then on the edit page scroll down the container args and add --pprof-server=true, example:

      containers:
      - args:
        - controller
        - --enable-leader-election
        - --config-map-name=postgresql-operator-controller-manager-config
        - --secret-name=postgresql-operator-controller-manager-config
        - --log-level=info
        - --pprof-server=true # relevant line
        command:
        - /manager

Save the changes, the deployment now will execute a rollout and the new pod will have the PPROF server enabled.

Once the pod is running you can exec inside the container by doing:

kubectl exec -ti -n postgresql-operator-system <pod name> -- bash

Once inside execute:

curl localhost:6060/debug/pprof/