make minimum limits boundaries configurable (#808)

* make minimum limits boundaries configurable
* add e2e test

charts/postgres-operator/crds/operatorconfigurations.yaml

@@ -179,6 +179,12 @@ spec:
                 default_memory_request:
                   type: string
                   pattern: '^(\d+(e\d+)?|\d+(\.\d+)?(e\d+)?[EPTGMK]i?)$'
+                min_cpu_limit:
+                  type: string
+                  pattern: '^(\d+m|\d+(\.\d{1,3})?)$'
+                min_memory_limit:
+                  type: string
+                  pattern: '^(\d+(e\d+)?|\d+(\.\d+)?(e\d+)?[EPTGMK]i?)$'
             timeouts:
               type: object
               properties:

charts/postgres-operator/values-crd.yaml

@@ -115,13 +115,17 @@ configKubernetes:
 # configure resource requests for the Postgres pods
 configPostgresPodResources:
   # CPU limits for the postgres containers
-  default_cpu_limit: "3"
-  # cpu request value for the postgres containers
+  default_cpu_limit: "1"
+  # CPU request value for the postgres containers
   default_cpu_request: 100m
   # memory limits for the postgres containers
-  default_memory_limit: 1Gi
+  default_memory_limit: 500Mi
   # memory request value for the postgres containers
   default_memory_request: 100Mi
+  # hard CPU minimum required to properly run a Postgres cluster
+  min_cpu_limit: 250m
+  # hard memory minimum required to properly run a Postgres cluster
+  min_memory_limit: 250Mi
 
 # timeouts related to some operator actions
 configTimeouts:
@@ -251,7 +255,7 @@ configScalyr:
   # CPU rquest value for the Scalyr sidecar
   scalyr_cpu_request: 100m
   # Memory limit value for the Scalyr sidecar
-  scalyr_memory_limit: 1Gi
+  scalyr_memory_limit: 500Mi
   # Memory request value for the Scalyr sidecar
   scalyr_memory_request: 50Mi
 
@@ -272,13 +276,13 @@ serviceAccount:
 
 priorityClassName: ""
 
-resources: {}
-  # limits:
-  #   cpu: 100m
-  #   memory: 300Mi
-  # requests:
-  #   cpu: 100m
-  #   memory: 300Mi
+resources:
+  limits:
+    cpu: 500m
+    memory: 500Mi
+  requests:
+    cpu: 100m
+    memory: 250Mi
 
 # Affinity for pod assignment
 # Ref: https://kubernetes.io/docs/concepts/configuration/assign-pod-node/#affinity-and-anti-affinity

charts/postgres-operator/values.yaml

@@ -108,13 +108,17 @@ configKubernetes:
 # configure resource requests for the Postgres pods
 configPostgresPodResources:
   # CPU limits for the postgres containers
-  default_cpu_limit: "3"
-  # cpu request value for the postgres containers
+  default_cpu_limit: "1"
+  # CPU request value for the postgres containers
   default_cpu_request: 100m
   # memory limits for the postgres containers
-  default_memory_limit: 1Gi
+  default_memory_limit: 500Mi
   # memory request value for the postgres containers
   default_memory_request: 100Mi
+  # hard CPU minimum required to properly run a Postgres cluster
+  min_cpu_limit: 250m
+  # hard memory minimum required to properly run a Postgres cluster
+  min_memory_limit: 250Mi
 
 # timeouts related to some operator actions
 configTimeouts:
@@ -248,13 +252,13 @@ serviceAccount:
 
 priorityClassName: ""
 
-resources: {}
-  # limits:
-  #   cpu: 100m
-  #   memory: 300Mi
-  # requests:
-  #   cpu: 100m
-  #   memory: 300Mi
+resources:
+  limits:
+    cpu: 500m
+    memory: 500Mi
+  requests:
+    cpu: 100m
+    memory: 250Mi
 
 # Affinity for pod assignment
 # Ref: https://kubernetes.io/docs/concepts/configuration/assign-pod-node/#affinity-and-anti-affinity