document resource consumption of the operator

docs/reference/operator_parameters.md

@@ -229,7 +229,7 @@ CRD-based configuration.
   settings. The default is `1Gi`.
 
 * **set_memory_request_to_limit**
-  Set `memory_request` to `memory_limit` for all Postgres clusters (the default value is also increased). This prevents certain cases of memory overcommitment at the cost of overprovisioning memory and potential scheduling problems for containers with high memory limits due to the lack of memory on Kubernetes cluster nodes. This affects all containers (Postgres, Scalyr sidecar, and other sidecars). The default is `false`.
+  Set `memory_request` to `memory_limit` for all Postgres clusters (the default value is also increased). This prevents certain cases of memory overcommitment at the cost of overprovisioning memory and potential scheduling problems for containers with high memory limits due to the lack of memory on Kubernetes cluster nodes. This affects all containers created by the operator (Postgres, Scalyr sidecar, and other sidecars); to set resources for the operator's own container, change the [operator deployment manually](https://github.com/zalando-incubator/postgres-operator/blob/master/manifests/postgres-operator.yaml#L13). The default is `false`.
 
 ## Operator timeouts
 

manifests/postgres-operator.yaml

@@ -14,6 +14,13 @@ spec:
       - name: postgres-operator
         image: registry.opensource.zalan.do/acid/smoke-tested-postgres-operator:v1.0.0-21-ge39915c
         imagePullPolicy: IfNotPresent
+        resources:
+          requests:
+            cpu: 100m
+            memory: 100Mi
+          limits:
+            cpu: 200m
+            memory: 200Mi
         env:
         # provided additional ENV vars can overwrite individual config map entries  
         - name: CONFIG_MAP_NAME

pkg/cluster/k8sres.go

@@ -645,6 +645,7 @@ func (c *Cluster) generateStatefulSet(spec *acidv1.PostgresSpec) (*v1beta1.State
 		volumeClaimTemplate *v1.PersistentVolumeClaim
 	)
 
+	// Improve me. Please.
 	if c.OpConfig.SetMemoryRequestToLimit {
 
 		// controller adjusts the default memory request at operator startup