rgw: gateway deployment strategy rolling on Pacific

When the strategy type of deployment is Recreate, from the moment the end is
started until the new pod is normally running, there is no pod in the
kubernetes service endpoints, so it goes to the service unavailable state.

Therefore, it is necessary to change it to `type: RollingUpdate` instead of
`type: Recreate` so that rolling updates can be made without downtime.

Before Pacific, creating a deployment as much as the instance was okay,
but after Pacific, the replicas was increased in one deployment, so rolling
updates were set up one by one as in the previous version.

Signed-off-by: micalgenus <micalgenus@gmail.com>

pkg/operator/ceph/object/spec.go

@@ -61,9 +61,19 @@ func (c *clusterConfig) createDeployment(rgwConfig *rgwConfig) (*apps.Deployment
 		return nil, err
 	}
 	replicas := int32(1)
-	// On Pacific, we can use the same keyring and have dedicated rgw instances reflected in the service map
+	strategy := apps.DeploymentStrategy{
+		Type: apps.RecreateDeploymentStrategyType,
+	}
 	if c.clusterInfo.CephVersion.IsAtLeastPacific() {
+		// On Pacific, we can use the same keyring and have dedicated rgw instances reflected in the service map
 		replicas = c.store.Spec.Gateway.Instances
+
+		// On Pacific, rgw gateway deployments rolling update
+		strategy.Type = apps.RollingUpdateDeploymentStrategyType
+		strategy.RollingUpdate = &apps.RollingUpdateDeployment{
+			MaxUnavailable: &intstr.IntOrString{IntVal: int32(1)},
+			MaxSurge:       &intstr.IntOrString{IntVal: int32(0)},
+		}
 	}
 	d := &apps.Deployment{
 		ObjectMeta: metav1.ObjectMeta{
@@ -77,9 +87,7 @@ func (c *clusterConfig) createDeployment(rgwConfig *rgwConfig) (*apps.Deployment
 			},
 			Template: pod,
 			Replicas: &replicas,
-			Strategy: apps.DeploymentStrategy{
-				Type: apps.RecreateDeploymentStrategyType,
-			},
+			Strategy: strategy,
 		},
 	}
 	k8sutil.AddRookVersionLabelToDeployment(d)