Enable scaling multiple controllers

contrib/completions/bash/kubectl

@@ -499,6 +499,7 @@ _kubectl_scale()
     two_word_flags+=("-o")
     flags+=("--replicas=")
     flags+=("--resource-version=")
+    flags+=("--timeout=")
 
     must_have_one_flag=()
     must_have_one_flag+=("--replicas=")

docs/man/man1/kubectl-scale.1

@@ -43,6 +43,10 @@ scale is sent to the server.
 \fB\-\-resource\-version\fP=""
     Precondition for resource version. Requires that the current resource version match this value in order to scale.
 
+.PP
+\fB\-\-timeout\fP=0
+    The length of time to wait before giving up on a scale operation, zero means don't wait.
+
 
 .SH OPTIONS INHERITED FROM PARENT COMMANDS
 .PP
@@ -153,6 +157,9 @@ $ kubectl scale \-\-replicas=3 replicationcontrollers foo
 // If the replication controller named foo's current size is 2, scale foo to 3.
 $ kubectl scale \-\-current\-replicas=2 \-\-replicas=3 replicationcontrollers foo
 
+// Scale multiple replication controllers.
+$ kubectl scale \-\-replicas=5 rc/foo rc/bar
+
 .fi
 .RE
 

docs/user-guide/kubectl/kubectl_scale.md

@@ -57,6 +57,9 @@ $ kubectl scale --replicas=3 replicationcontrollers foo
 
 // If the replication controller named foo's current size is 2, scale foo to 3.
 $ kubectl scale --current-replicas=2 --replicas=3 replicationcontrollers foo
+
+// Scale multiple replication controllers.
+$ kubectl scale --replicas=5 rc/foo rc/bar
 ```
 
 ### Options
@@ -67,6 +70,7 @@ $ kubectl scale --current-replicas=2 --replicas=3 replicationcontrollers foo
   -o, --output="": Output mode. Use "-o name" for shorter output (resource/name).
       --replicas=-1: The new desired number of replicas. Required.
       --resource-version="": Precondition for resource version. Requires that the current resource version match this value in order to scale.
+      --timeout=0: The length of time to wait before giving up on a scale operation, zero means don't wait.
 ```
 
 ### Options inherited from parent commands
@@ -102,7 +106,7 @@ $ kubectl scale --current-replicas=2 --replicas=3 replicationcontrollers foo
 
 * [kubectl](kubectl.md)	 - kubectl controls the Kubernetes cluster manager
 
-###### Auto generated by spf13/cobra at 2015-07-14 00:11:42.956739933 +0000 UTC
+###### Auto generated by spf13/cobra at 2015-07-30 08:50:55.94117889 +0000 UTC
 
 
 <!-- BEGIN MUNGE: GENERATED_ANALYTICS -->

hack/test-cmd.sh

@@ -614,6 +614,17 @@ __EOF__
   # Post-condition: 3 replicas
   kube::test::get_object_assert 'rc frontend' "{{$rc_replicas_field}}" '3'
 
+  ### Scale multiple replication controllers
+  kubectl create -f examples/guestbook/redis-master-controller.yaml "${kube_flags[@]}"
+  kubectl create -f examples/guestbook/redis-slave-controller.yaml "${kube_flags[@]}"
+  # Command
+  kubectl scale rc/redis-master rc/redis-slave --replicas=4
+  # Post-condition: 4 replicas each
+  kube::test::get_object_assert 'rc redis-master' "{{$rc_replicas_field}}" '4'
+  kube::test::get_object_assert 'rc redis-slave' "{{$rc_replicas_field}}" '4'
+  # Clean-up
+  kubectl delete rc redis-{master,slave} "${kube_flags[@]}"
+
   ### Expose replication controller as service
   # Pre-condition: 3 replicas
   kube::test::get_object_assert 'rc frontend' "{{$rc_replicas_field}}" '3'

pkg/kubectl/cmd/scale.go

@@ -26,6 +26,7 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/kubectl"
 	cmdutil "github.com/GoogleCloudPlatform/kubernetes/pkg/kubectl/cmd/util"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/kubectl/resource"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/util/errors"
 )
 
 const (
@@ -39,7 +40,10 @@ scale is sent to the server.`
 $ kubectl scale --replicas=3 replicationcontrollers foo
 
 // If the replication controller named foo's current size is 2, scale foo to 3.
-$ kubectl scale --current-replicas=2 --replicas=3 replicationcontrollers foo`
+$ kubectl scale --current-replicas=2 --replicas=3 replicationcontrollers foo
+
+// Scale multiple replication controllers.
+$ kubectl scale --replicas=5 rc/foo rc/bar`
 )
 
 // NewCmdScale returns a cobra command with the appropriate configuration and flags to run scale
@@ -61,6 +65,7 @@ func NewCmdScale(f *cmdutil.Factory, out io.Writer) *cobra.Command {
 	cmd.Flags().String("resource-version", "", "Precondition for resource version. Requires that the current resource version match this value in order to scale.")
 	cmd.Flags().Int("current-replicas", -1, "Precondition for current size. Requires that the current size of the replication controller match this value in order to scale.")
 	cmd.Flags().Int("replicas", -1, "The new desired number of replicas. Required.")
+	cmd.Flags().Duration("timeout", 0, "The length of time to wait before giving up on a scale operation, zero means don't wait.")
 	cmd.MarkFlagRequired("replicas")
 	cmdutil.AddOutputFlagsForMutation(cmd)
 	return cmd
@@ -102,10 +107,6 @@ func RunScale(f *cmdutil.Factory, out io.Writer, cmd *cobra.Command, args []stri
 	if err != nil {
 		return err
 	}
-	if len(infos) > 1 {
-		return fmt.Errorf("multiple resources provided: %v", args)
-	}
-	info := infos[0]
 
 	scaler, err := f.Scaler(mapping)
 	if err != nil {
@@ -113,13 +114,28 @@ func RunScale(f *cmdutil.Factory, out io.Writer, cmd *cobra.Command, args []stri
 	}
 
 	resourceVersion := cmdutil.GetFlagString(cmd, "resource-version")
+	if len(resourceVersion) != 0 && len(infos) > 1 {
+		return fmt.Errorf("cannot use --resource-version with multiple controllers")
+	}
 	currentSize := cmdutil.GetFlagInt(cmd, "current-replicas")
+	if currentSize != -1 && len(infos) > 1 {
+		return fmt.Errorf("cannot use --current-replicas with multiple controllers")
+	}
 	precondition := &kubectl.ScalePrecondition{currentSize, resourceVersion}
 	retry := kubectl.NewRetryParams(kubectl.Interval, kubectl.Timeout)
-	waitForReplicas := kubectl.NewRetryParams(kubectl.Interval, kubectl.Timeout)
-	if err := scaler.Scale(info.Namespace, info.Name, uint(count), precondition, retry, waitForReplicas); err != nil {
-		return err
+	var waitForReplicas *kubectl.RetryParams
+	if timeout := cmdutil.GetFlagDuration(cmd, "timeout"); timeout != 0 {
+		waitForReplicas = kubectl.NewRetryParams(kubectl.Interval, timeout)
 	}
-	cmdutil.PrintSuccess(mapper, shortOutput, out, info.Mapping.Resource, info.Name, "scaled")
-	return nil
+
+	errs := []error{}
+	for _, info := range infos {
+		if err := scaler.Scale(info.Namespace, info.Name, uint(count), precondition, retry, waitForReplicas); err != nil {
+			errs = append(errs, err)
+			continue
+		}
+		cmdutil.PrintSuccess(mapper, shortOutput, out, info.Mapping.Resource, info.Name, "scaled")
+	}
+
+	return errors.NewAggregate(errs)
 }

test/e2e/kubectl.go

@@ -104,10 +104,10 @@ var _ = Describe("Kubectl client", func() {
 			runKubectl("create", "-f", nautilusPath, fmt.Sprintf("--namespace=%v", ns))
 			validateController(c, nautilusImage, 2, "update-demo", updateDemoSelector, getUDData("nautilus.jpg", ns), ns)
 			By("scaling down the replication controller")
-			runKubectl("scale", "rc", "update-demo-nautilus", "--replicas=1", fmt.Sprintf("--namespace=%v", ns))
+			runKubectl("scale", "rc", "update-demo-nautilus", "--replicas=1", "--timeout=5m", fmt.Sprintf("--namespace=%v", ns))
 			validateController(c, nautilusImage, 1, "update-demo", updateDemoSelector, getUDData("nautilus.jpg", ns), ns)
 			By("scaling up the replication controller")
-			runKubectl("scale", "rc", "update-demo-nautilus", "--replicas=2", fmt.Sprintf("--namespace=%v", ns))
+			runKubectl("scale", "rc", "update-demo-nautilus", "--replicas=2", "--timeout=5m", fmt.Sprintf("--namespace=%v", ns))
 			validateController(c, nautilusImage, 2, "update-demo", updateDemoSelector, getUDData("nautilus.jpg", ns), ns)
 		})