Scheduler predicates test that may violate DNS label rules

[pires]

/kind bug
cc @kubernetes/sig-scheduling-bugs

What happened: Running one scheduling predicates conformance test on a 1.7.10 cluster where node names are FQDN, e.g. kube-node-0.kubernetes.mesos, fails.

[21:36:48][Step 4/8] • Failure [83.160 seconds]
[21:36:48][Step 4/8] [k8s.io] SchedulerPredicates [Serial]
[21:36:48][Step 4/8] /pkg/src/k8s.io/kubernetes/_output/local/go/src/k8s.io/kubernetes/test/e2e/framework/framework.go:619
[21:36:48][Step 4/8]   validates resource limits of pods that are allowed to run [Conformance] [It]
[21:36:48][Step 4/8]   /pkg/src/k8s.io/kubernetes/_output/local/go/src/k8s.io/kubernetes/test/e2e/scheduling/predicates.go:160
[21:36:48][Step 4/8] 
[21:36:48][Step 4/8]   Expected error:
[21:36:48][Step 4/8]       <*errors.StatusError | 0xc42022bb80>: {
[21:36:48][Step 4/8]           ErrStatus: {
[21:36:48][Step 4/8]               TypeMeta: {Kind: "", APIVersion: ""},
[21:36:48][Step 4/8]               ListMeta: {SelfLink: "", ResourceVersion: ""},
[21:36:48][Step 4/8]               Status: "Failure",
[21:36:48][Step 4/8]               Message: "Pod \"filler-pod-kube-node-5-kubelet.kubernetes.mesos\" is invalid: spec.containers[0].name: Invalid value: \"filler-pod-kube-node-5-kubelet.kubernetes.mesos\": a DNS-1123 label must consist of lower case alphanumeric characters or '-', and must start and end with an alphanumeric character (e.g. 'my-name',  or '123-abc', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?')",
[21:36:48][Step 4/8]               Reason: "Invalid",
[21:36:48][Step 4/8]               Details: {
[21:36:48][Step 4/8]                   Name: "filler-pod-kube-node-5-kubelet.kubernetes.mesos",
[21:36:48][Step 4/8]                   Group: "",
[21:36:48][Step 4/8]                   Kind: "Pod",
[21:36:48][Step 4/8]                   UID: "",
[21:36:48][Step 4/8]                   Causes: [
[21:36:48][Step 4/8]                       {
[21:36:48][Step 4/8]                           Type: "FieldValueInvalid",
[21:36:48][Step 4/8]                           Message: "Invalid value: \"filler-pod-kube-node-5-kubelet.kubernetes.mesos\": a DNS-1123 label must consist of lower case alphanumeric characters or '-', and must start and end with an alphanumeric character (e.g. 'my-name',  or '123-abc', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?')",
[21:36:48][Step 4/8]                           Field: "spec.containers[0].name",
[21:36:48][Step 4/8]                       },
[21:36:48][Step 4/8]                   ],
[21:36:48][Step 4/8]                   RetryAfterSeconds: 0,
[21:36:48][Step 4/8]               },
[21:36:48][Step 4/8]               Code: 422,
[21:36:48][Step 4/8]           },
[21:36:48][Step 4/8]       }
[21:36:48][Step 4/8]       Pod "filler-pod-kube-node-5-kubelet.kubernetes.mesos" is invalid: spec.containers[0].name: Invalid value: "filler-pod-kube-node-5-kubelet.kubernetes.mesos": a DNS-1123 label must consist of lower case alphanumeric characters or '-', and must start and end with an alphanumeric character (e.g. 'my-name',  or '123-abc', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?')
[21:36:48][Step 4/8]   not to have occurred
[21:36:48][Step 4/8] 
[21:36:48][Step 4/8]   /pkg/src/k8s.io/kubernetes/_output/local/go/src/k8s.io/kubernetes/test/e2e/scheduling/predicates.go:807

What you expected to happen: The tests should pass.

How to reproduce it (as minimally and precisely as possible):

Follow these instructions to deploy Kubernetes 1.7.10 on DC/OS or bootstrap a Kubernetes cluster where nodes names are FQDN, e.g. my-node-1.example.com.

Anything else we need to know?:

Also affects master but not 1.8.x.

Environment:

• Kubernetes version (use kubectl version):

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"7", GitVersion:"v1.7.5", GitCommit:"17d7182a7ccbb167074be7a87f0a68bd00d58d97", GitTreeState:"clean", BuildDate:"2017-08-31T09:14:02Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"7", GitVersion:"v1.7.10", GitCommit:"bebdeb749f1fa3da9e1312c4b08e439c404b3136", GitTreeState:"clean", BuildDate:"2017-11-03T16:31:49Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"linux/amd64"}

• Cloud provider or hardware configuration: GCP
• OS (e.g. from /etc/os-release):

$ cat /etc/lsb-release
DISTRIB_ID="Container Linux by CoreOS"
DISTRIB_RELEASE=1465.6.0
DISTRIB_CODENAME="Ladybug"
DISTRIB_DESCRIPTION="Container Linux by CoreOS 1465.6.0 (Ladybug)"

• Kernel (e.g. uname -a):

$ uname -a
Linux pires-aa53f593-private-agents-ff9n.c.massive-bliss-781.internal 4.12.7-coreos #1 SMP Tue Aug 15 23:54:56 UTC 2017 x86_64 Intel(R) Xeon(R) CPU @ 2.30GHz GenuineIntel GNU/Linux

• Install tools: Kubernetes 1.7.10 on DC/OS
• Others: none

[pires]

Cherry-pick for 1.7.x #55156.

Again, it doesn't seem to affect 1.8.x.