Add support for resource cpu limit to generate kube

fixes #7855

Signed-off-by: Andy Librian <andylibrian@gmail.com>

2 files changed, 63 insertions, 9 deletions

diff --git a/libpod/kube.go b/libpod/kube.go
index 6df79e394..cd5064c84 100644
--- a/libpod/kube.go
+++ b/libpod/kube.go
@@ -307,18 +307,40 @@ func containerToV1Container(c *Container) (v1.Container, []v1.Volume, error) {
 	kubeContainer.StdinOnce = false
 	kubeContainer.TTY = c.config.Spec.Process.Terminal
 
-	// TODO add CPU limit support.
 	if c.config.Spec.Linux != nil &&
-		c.config.Spec.Linux.Resources != nil &&
-		c.config.Spec.Linux.Resources.Memory != nil &&
-		c.config.Spec.Linux.Resources.Memory.Limit != nil {
-		if kubeContainer.Resources.Limits == nil {
-			kubeContainer.Resources.Limits = v1.ResourceList{}
+		c.config.Spec.Linux.Resources != nil {
+		if c.config.Spec.Linux.Resources.Memory != nil &&
+			c.config.Spec.Linux.Resources.Memory.Limit != nil {
+			if kubeContainer.Resources.Limits == nil {
+				kubeContainer.Resources.Limits = v1.ResourceList{}
+			}
+
+			qty := kubeContainer.Resources.Limits.Memory()
+			qty.Set(*c.config.Spec.Linux.Resources.Memory.Limit)
+			kubeContainer.Resources.Limits[v1.ResourceMemory] = *qty
 		}
 
-		qty := kubeContainer.Resources.Limits.Memory()
-		qty.Set(*c.config.Spec.Linux.Resources.Memory.Limit)
-		kubeContainer.Resources.Limits[v1.ResourceMemory] = *qty
+		if c.config.Spec.Linux.Resources.CPU != nil &&
+			c.config.Spec.Linux.Resources.CPU.Quota != nil &&
+			c.config.Spec.Linux.Resources.CPU.Period != nil {
+			quota := *c.config.Spec.Linux.Resources.CPU.Quota
+			period := *c.config.Spec.Linux.Resources.CPU.Period
+
+			if quota > 0 && period > 0 {
+				cpuLimitMilli := int64(1000 * float64(quota) / float64(period))
+
+				// Kubernetes: precision finer than 1m is not allowed
+				if cpuLimitMilli >= 1 {
+					if kubeContainer.Resources.Limits == nil {
+						kubeContainer.Resources.Limits = v1.ResourceList{}
+					}
+
+					qty := kubeContainer.Resources.Limits.Cpu()
+					qty.SetMilli(cpuLimitMilli)
+					kubeContainer.Resources.Limits[v1.ResourceCPU] = *qty
+				}
+			}
+		}
 	}
 
 	return kubeContainer, kubeVolumes, nil
diff --git a/test/e2e/generate_kube_test.go b/test/e2e/generate_kube_test.go
index 05a7f4ddf..3c4a1008b 100644
--- a/test/e2e/generate_kube_test.go
+++ b/test/e2e/generate_kube_test.go
@@ -260,6 +260,38 @@ var _ = Describe("Podman generate kube", func() {
 		}
 	})
 
+	It("podman generate kube on pod with cpu limit", func() {
+		podName := "testCpuLimit"
+		podSession := podmanTest.Podman([]string{"pod", "create", "--name", podName})
+		podSession.WaitWithDefaultTimeout()
+		Expect(podSession.ExitCode()).To(Equal(0))
+
+		ctr1Name := "ctr1"
+		ctr1Session := podmanTest.Podman([]string{"create", "--name", ctr1Name, "--pod", podName,
+			"--cpus", "0.5", ALPINE, "top"})
+		ctr1Session.WaitWithDefaultTimeout()
+		Expect(ctr1Session.ExitCode()).To(Equal(0))
+
+		ctr2Name := "ctr2"
+		ctr2Session := podmanTest.Podman([]string{"create", "--name", ctr2Name, "--pod", podName,
+			"--cpu-period", "100000", "--cpu-quota", "50000", ALPINE, "top"})
+		ctr2Session.WaitWithDefaultTimeout()
+		Expect(ctr2Session.ExitCode()).To(Equal(0))
+
+		kube := podmanTest.Podman([]string{"generate", "kube", podName})
+		kube.WaitWithDefaultTimeout()
+		Expect(kube.ExitCode()).To(Equal(0))
+
+		pod := new(v1.Pod)
+		err := yaml.Unmarshal(kube.Out.Contents(), pod)
+		Expect(err).To(BeNil())
+
+		for _, ctr := range pod.Spec.Containers {
+			cpuLimit := ctr.Resources.Limits.Cpu().MilliValue()
+			Expect(cpuLimit).To(Equal(int64(500)))
+		}
+	})
+
 	It("podman generate kube on pod with ports", func() {
 		podName := "test"
 		podSession := podmanTest.Podman([]string{"pod", "create", "--name", podName, "-p", "4000:4000", "-p", "5000:5000"})