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operator_conf.md

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Operator configuration

The operator for CloudNativePG 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:

  • 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 cnpg-system namespace as a Kubernetes Deployment called cnpg-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 cnpg-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:

Name Description
INHERITED_ANNOTATIONS list of annotation names that, when defined in a Cluster metadata, will be inherited by all the generated resources, including pods
INHERITED_LABELS list of label names that, when defined in a Cluster metadata, will be inherited by all the generated resources, including pods
PULL_SECRET_NAME name of an additional pull secret to be defined in the operator's namespace and to be used to download images
ENABLE_AZURE_PVC_UPDATES Enables 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_UPDATES when 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_CONFIGMAP The 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_SECRET The 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
CERTIFICATE_DURATION Determines the lifetime of the generated certificates in days. Default is 90.
EXPIRING_CHECK_THRESHOLD Determines the threshold, in days, for identifying a certificate as expiring. Default is 7.
CREATE_ANY_SERVICE when set to true, will create -any service for the cluster. Default is false
INCLUDE_PLUGINS A comma-separated list of plugins to be always included in the Cluster's reconciliation.

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.

Defining an operator config map

The example below customizes the behavior of the operator, by defining 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: cnpg-controller-manager-config
  namespace: cnpg-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 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: Secret
metadata:
  name: cnpg-controller-manager-config
  namespace: cnpg-system
type: Opaque
stringData:
  INHERITED_ANNOTATIONS: categories
  INHERITED_LABELS: environment, workload, app
  ENABLE_INSTANCE_MANAGER_INPLACE_UPDATES: 'true'

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 cnpg-system \
    cnpg-controller-manager

In general, given a specific namespace, you can delete the operator pods with the following command:

kubectl delete pods -n [NAMESPACE_NAME_HERE] \
  -l app.kubernetes.io/name=cloudnative-pg

!!! 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 NULL 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 cnpg-system cnpg-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=cnpg-controller-manager-config
        - --secret-name=cnpg-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 cnpg-system <pod name> -- bash

Once inside execute:

curl localhost:6060/debug/pprof/