diff --git a/pkg/api/pod/warnings.go b/pkg/api/pod/warnings.go
index c30c99b02d3..84fb25a64d0 100644
--- a/pkg/api/pod/warnings.go
+++ b/pkg/api/pod/warnings.go
@@ -320,6 +320,21 @@ func warningsForPodSpecAndMeta(fieldPath *field.Path, podSpec *api.PodSpec, meta
 		return true
 	})
 
+	// Accumulate port names of containers and sidecar containers
+	allPortsNames := map[string]*field.Path{}
+	pods.VisitContainersWithPath(podSpec, fieldPath.Child("spec"), func(c *api.Container, fldPath *field.Path) bool {
+		for i, port := range c.Ports {
+			if port.Name != "" {
+				if other, found := allPortsNames[port.Name]; found {
+					warnings = append(warnings, fmt.Sprintf("%s: duplicate port name %q with %s, services and probes that select ports by name will use %s", fldPath.Child("ports").Index(i), port.Name, other, other))
+				} else {
+					allPortsNames[port.Name] = fldPath.Child("ports").Index(i)
+				}
+			}
+		}
+		return true
+	})
+
 	// warn if the terminationGracePeriodSeconds is negative.
 	if podSpec.TerminationGracePeriodSeconds != nil && *podSpec.TerminationGracePeriodSeconds < 0 {
 		warnings = append(warnings, fmt.Sprintf("%s: must be >= 0; negative values are invalid and will be treated as 1", fieldPath.Child("spec", "terminationGracePeriodSeconds")))
diff --git a/pkg/api/pod/warnings_test.go b/pkg/api/pod/warnings_test.go
index f3f0687131d..b285a4b9f09 100644
--- a/pkg/api/pod/warnings_test.go
+++ b/pkg/api/pod/warnings_test.go
@@ -140,6 +140,7 @@ func BenchmarkWarnings(b *testing.B) {
 }
 
 func TestWarnings(t *testing.T) {
+	containerRestartPolicyAlways := api.ContainerRestartPolicyAlways
 	resources := api.ResourceList{
 		api.ResourceCPU:              resource.MustParse("100m"),
 		api.ResourceMemory:           resource.MustParse("4m"),
@@ -1520,6 +1521,196 @@ func TestWarnings(t *testing.T) {
 				`spec.containers[1].ports[1]: duplicate port definition with spec.containers[1].ports[0]`,
 			},
 		},
+		{
+			name: "create duplicate container ports name in two containers",
+			template: &api.PodTemplateSpec{Spec: api.PodSpec{
+				Containers: []api.Container{
+					{
+						Name: "foo1",
+						Ports: []api.ContainerPort{
+							{ContainerPort: 80, Protocol: api.ProtocolUDP, Name: "test"},
+						},
+					},
+					{
+						Name: "foo",
+						Ports: []api.ContainerPort{
+							{ContainerPort: 8090, Protocol: api.ProtocolTCP, Name: "test"},
+						},
+					}},
+			}},
+			expected: []string{
+				`spec.containers[1].ports[0]: duplicate port name "test" with spec.containers[0].ports[0], services and probes that select ports by name will use spec.containers[0].ports[0]`,
+			},
+		},
+		{
+			name: "update duplicate container ports name in two containers",
+			template: &api.PodTemplateSpec{Spec: api.PodSpec{
+				Containers: []api.Container{
+					{
+						Name: "foo1",
+						Ports: []api.ContainerPort{
+							{ContainerPort: 80, Protocol: api.ProtocolUDP, Name: "test"},
+						},
+					},
+					{
+						Name: "foo",
+						Ports: []api.ContainerPort{
+							{ContainerPort: 8090, Protocol: api.ProtocolUDP, Name: "test1"},
+							{ContainerPort: 8092, Protocol: api.ProtocolUDP, Name: "test"},
+						},
+					}},
+			}},
+			oldTemplate: &api.PodTemplateSpec{Spec: api.PodSpec{
+				Containers: []api.Container{
+					{
+						Name: "foo1",
+						Ports: []api.ContainerPort{
+							{ContainerPort: 80, Protocol: api.ProtocolUDP, Name: "test"},
+						},
+					},
+					{
+						Name: "foo",
+						Ports: []api.ContainerPort{
+							{ContainerPort: 8090, Protocol: api.ProtocolUDP, Name: "test1"},
+						},
+					}},
+			}},
+			expected: []string{
+				`spec.containers[1].ports[1]: duplicate port name "test" with spec.containers[0].ports[0], services and probes that select ports by name will use spec.containers[0].ports[0]`,
+			},
+		},
+		{
+			name: "create duplicate container ports name in two sidecar containers",
+			template: &api.PodTemplateSpec{Spec: api.PodSpec{
+				InitContainers: []api.Container{
+					{
+						RestartPolicy: &containerRestartPolicyAlways,
+						Name:          "foo1",
+						Ports: []api.ContainerPort{
+							{ContainerPort: 80, Protocol: api.ProtocolUDP, Name: "test"},
+						},
+					},
+					{
+						Name:          "foo",
+						RestartPolicy: &containerRestartPolicyAlways,
+						Ports: []api.ContainerPort{
+							{ContainerPort: 8090, Protocol: api.ProtocolTCP, Name: "test"},
+						},
+					}},
+			}},
+			expected: []string{
+				`spec.initContainers[1].ports[0]: duplicate port name "test" with spec.initContainers[0].ports[0], services and probes that select ports by name will use spec.initContainers[0].ports[0]`,
+			},
+		},
+		{
+			name: "update duplicate container ports name in two sidecar containers",
+			template: &api.PodTemplateSpec{Spec: api.PodSpec{
+				InitContainers: []api.Container{
+					{
+						Name:          "foo1",
+						RestartPolicy: &containerRestartPolicyAlways,
+						Ports: []api.ContainerPort{
+							{ContainerPort: 80, Protocol: api.ProtocolUDP, Name: "test"},
+						},
+					},
+					{
+						Name:          "foo",
+						RestartPolicy: &containerRestartPolicyAlways,
+						Ports: []api.ContainerPort{
+							{ContainerPort: 8090, Protocol: api.ProtocolUDP, Name: "test1"},
+							{ContainerPort: 8091, Protocol: api.ProtocolUDP, Name: "test"},
+						},
+					}},
+			}},
+			oldTemplate: &api.PodTemplateSpec{Spec: api.PodSpec{
+				Containers: []api.Container{
+					{
+						Name:          "foo1",
+						RestartPolicy: &containerRestartPolicyAlways,
+						Ports: []api.ContainerPort{
+							{ContainerPort: 80, Protocol: api.ProtocolUDP, Name: "test"},
+						},
+					},
+					{
+						Name:          "foo",
+						RestartPolicy: &containerRestartPolicyAlways,
+						Ports: []api.ContainerPort{
+							{ContainerPort: 8090, Protocol: api.ProtocolUDP, Name: "test1"},
+						},
+					}},
+			}},
+			expected: []string{
+				`spec.initContainers[1].ports[1]: duplicate port name "test" with spec.initContainers[0].ports[0], services and probes that select ports by name will use spec.initContainers[0].ports[0]`,
+			},
+		},
+		{
+			name: "create duplicate container ports name in containers and sidecar containers",
+			template: &api.PodTemplateSpec{Spec: api.PodSpec{
+				InitContainers: []api.Container{
+					{
+						RestartPolicy: &containerRestartPolicyAlways,
+						Name:          "foo1",
+						Ports: []api.ContainerPort{
+							{ContainerPort: 80, Protocol: api.ProtocolUDP, Name: "test"},
+						},
+					},
+				},
+				Containers: []api.Container{
+					{
+						Name: "foo",
+						Ports: []api.ContainerPort{
+							{ContainerPort: 8090, Protocol: api.ProtocolTCP, Name: "test"},
+						},
+					}},
+			}},
+			expected: []string{
+				`spec.containers[0].ports[0]: duplicate port name "test" with spec.initContainers[0].ports[0], services and probes that select ports by name will use spec.initContainers[0].ports[0]`,
+			},
+		},
+		{
+			name: "update duplicate container ports name in containers and sidecar containers",
+			template: &api.PodTemplateSpec{Spec: api.PodSpec{
+				InitContainers: []api.Container{
+					{
+						Name:          "foo1",
+						RestartPolicy: &containerRestartPolicyAlways,
+						Ports: []api.ContainerPort{
+							{ContainerPort: 80, Protocol: api.ProtocolUDP, Name: "test"},
+						},
+					},
+				},
+				Containers: []api.Container{
+					{
+						Name: "foo",
+						Ports: []api.ContainerPort{
+							{ContainerPort: 8090, Protocol: api.ProtocolUDP, Name: "test1"},
+							{ContainerPort: 8092, Protocol: api.ProtocolUDP, Name: "test"},
+						},
+					},
+				},
+			}},
+			oldTemplate: &api.PodTemplateSpec{Spec: api.PodSpec{
+				InitContainers: []api.Container{
+					{
+						Name:          "foo1",
+						RestartPolicy: &containerRestartPolicyAlways,
+						Ports: []api.ContainerPort{
+							{ContainerPort: 80, Protocol: api.ProtocolUDP, Name: "test"},
+						},
+					},
+				},
+				Containers: []api.Container{
+					{
+						Name: "foo",
+						Ports: []api.ContainerPort{
+							{ContainerPort: 8090, Protocol: api.ProtocolUDP, Name: "test1"},
+						},
+					}},
+			}},
+			expected: []string{
+				`spec.containers[0].ports[1]: duplicate port name "test" with spec.initContainers[0].ports[0], services and probes that select ports by name will use spec.initContainers[0].ports[0]`,
+			},
+		},
 	}
 
 	for _, tc := range testcases {