[MCO] Add a flag to allow irreconcilable configs

The flag will tell the operator to skip the irreconcilable fields
validation and let the user update/patch conflictive MCs in the cluster
at his own risk. This feature is specially thought to allow users to add
new nodes in a long standing cluster with newer configuration.

Author: pablintino

openapi/generated_openapi/zz_generated.openapi.go

@@ -30146,6 +30146,11 @@
         "forceRedeploymentReason"
       ],
       "properties": {
+        "configurationValidationPolicy": {
+          "description": "machineConfigValidationPolicy tells the operator to ignore irreconciliable configuration changes in already existing nodes. New nodes joining the cluster will see the newest configuration. Valid values are Strict and Relaxed.",
+          "type": "string",
+          "default": "Strict"
+        },
         "failedRevisionLimit": {
           "description": "failedRevisionLimit is the number of failed static pod installer revisions to keep on disk and in the api -1 = unlimited, 0 or unset = 5 (default)",
           "type": "integer",

openapi/openapi.json

@@ -4,6 +4,8 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
 
+type MachineConfigurationValidationPolicy string
+
 // +genclient
 // +genclient:nonNamespaced
 // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
@@ -56,6 +58,16 @@ type MachineConfigurationSpec struct {
 	// +openshift:enable:FeatureGate=NodeDisruptionPolicy
 	// +optional
 	NodeDisruptionPolicy NodeDisruptionPolicyConfig `json:"nodeDisruptionPolicy"`
+
+
+	// machineConfigValidationPolicy tells the operator to ignore irreconciliable configuration changes
+	// in already existing nodes. New nodes joining the cluster will see the newest configuration.
+	// Valid values are Strict and Relaxed.
+	// +kubebuilder:validation:Enum=Strict;Relaxed
+	// +kubebuilder:validation:Default=Strict
+	// +default="Strict"
+	// +optional
+	ConfigurationValidationPolicy MachineConfigurationValidationPolicy `json:"configurationValidationPolicy,omitempty"`
 }
 
 type MachineConfigurationStatus struct {

operator/v1/types_machineconfiguration.go

@@ -45,6 +45,16 @@ spec:
             description: spec is the specification of the desired behavior of the
               Machine Config Operator
             properties:
+              configurationValidationPolicy:
+                default: Strict
+                description: |-
+                  machineConfigValidationPolicy tells the operator to ignore irreconciliable configuration changes
+                  in already existing nodes. New nodes joining the cluster will see the newest configuration.
+                  Valid values are Strict and Relaxed.
+                enum:
+                - Strict
+                - Relaxed
+                type: string
               failedRevisionLimit:
                 description: |-
                   failedRevisionLimit is the number of failed static pod installer revisions to keep on disk and in the api

operator/v1/zz_generated.crd-manifests/0000_80_machine-config_01_machineconfigurations.crd.yaml

@@ -46,6 +46,16 @@ spec:
             description: spec is the specification of the desired behavior of the
               Machine Config Operator
             properties:
+              configurationValidationPolicy:
+                default: Strict
+                description: |-
+                  machineConfigValidationPolicy tells the operator to ignore irreconciliable configuration changes
+                  in already existing nodes. New nodes joining the cluster will see the newest configuration.
+                  Valid values are Strict and Relaxed.
+                enum:
+                - Strict
+                - Relaxed
+                type: string
               failedRevisionLimit:
                 description: |-
                   failedRevisionLimit is the number of failed static pod installer revisions to keep on disk and in the api

operator/v1/zz_generated.featuregated-crd-manifests/machineconfigurations.operator.openshift.io/AAA_ungated.yaml

@@ -46,6 +46,16 @@ spec:
             description: spec is the specification of the desired behavior of the
               Machine Config Operator
             properties:
+              configurationValidationPolicy:
+                default: Strict
+                description: |-
+                  machineConfigValidationPolicy tells the operator to ignore irreconciliable configuration changes
+                  in already existing nodes. New nodes joining the cluster will see the newest configuration.
+                  Valid values are Strict and Relaxed.
+                enum:
+                - Strict
+                - Relaxed
+                type: string
               failedRevisionLimit:
                 description: |-
                   failedRevisionLimit is the number of failed static pod installer revisions to keep on disk and in the api

operator/v1/zz_generated.featuregated-crd-manifests/machineconfigurations.operator.openshift.io/ManagedBootImages.yaml

@@ -46,6 +46,16 @@ spec:
             description: spec is the specification of the desired behavior of the
               Machine Config Operator
             properties:
+              configurationValidationPolicy:
+                default: Strict
+                description: |-
+                  machineConfigValidationPolicy tells the operator to ignore irreconciliable configuration changes
+                  in already existing nodes. New nodes joining the cluster will see the newest configuration.
+                  Valid values are Strict and Relaxed.
+                enum:
+                - Strict
+                - Relaxed
+                type: string
               failedRevisionLimit:
                 description: |-
                   failedRevisionLimit is the number of failed static pod installer revisions to keep on disk and in the api

operator/v1/zz_generated.featuregated-crd-manifests/machineconfigurations.operator.openshift.io/NodeDisruptionPolicy.yaml

@@ -45,6 +45,16 @@ spec:
             description: spec is the specification of the desired behavior of the
               Machine Config Operator
             properties:
+              configurationValidationPolicy:
+                default: Strict
+                description: |-
+                  machineConfigValidationPolicy tells the operator to ignore irreconciliable configuration changes
+                  in already existing nodes. New nodes joining the cluster will see the newest configuration.
+                  Valid values are Strict and Relaxed.
+                enum:
+                - Strict
+                - Relaxed
+                type: string
               failedRevisionLimit:
                 description: |-
                   failedRevisionLimit is the number of failed static pod installer revisions to keep on disk and in the api