coredns pending

[heidini]

Is this a request for help?

If yes, you should use our troubleshooting guide and community support channels, see http://kubernetes.io/docs/troubleshooting/.

If no, delete this section and continue on.

What keywords did you search in kubeadm issues before filing this one?

If you have found any duplicates, you should instead reply there and close this page.

If you have not found any duplicates, delete this section and continue on.

Is this a BUG REPORT or FEATURE REQUEST?

Choose one: BUG REPORT or FEATURE REQUEST

Versions

kubeadm version (use kubeadm version):

Environment:

• Kubernetes version (use kubectl version):
• Cloud provider or hardware configuration:
• OS (e.g. from /etc/os-release):
• Kernel (e.g. uname -a):
• Others:

What happened?

What you expected to happen?

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

Anything else we need to know?

[heidini]

Environment:
osboxes@kubemaster:$ kubectl version
Client Version: version.Info{Major:"1", Minor:"13", GitVersion:"v1.13.1", GitCommit:"eec55b9ba98609a46fee712359c7b5b365bdd920", GitTreeState:"clean", BuildDate:"2018-12-13T10:39:04Z", GoVersion:"go1.11.2", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"13", GitVersion:"v1.13.1", GitCommit:"eec55b9ba98609a46fee712359c7b5b365bdd920", GitTreeState:"clean", BuildDate:"2018-12-13T10:31:33Z", GoVersion:"go1.11.2", Compiler:"gc", Platform:"linux/amd64"}
osboxes@kubemaster:$ uname -a
Linux kubemaster 4.15.0-29-generic #31~16.04.1-Ubuntu SMP Wed Jul 18 08:54:04 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

NAME="Ubuntu"
VERSION="16.04.5 LTS (Xenial Xerus)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 16.04.5 LTS"
VERSION_ID="16.04"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"
VERSION_CODENAME=xenial
UBUNTU_CODENAME=xenial

[neolit123]

did you try the suggestions here:
https://kubernetes.io/docs/setup/independent/troubleshooting-kubeadm/

[heidini]

The page assumed the pending state is before install the pod network, but for me, it is after I applied the https://raw.githubusercontent.com/coreos/flannel/v0.10.0/Documentation/kube-flannel.yml, core-dns always stuck in pending.
I also tried apply the https://raw.githubusercontent.com/coreos/flannel/bc79dd1505b0c8681ece4de4c0d86c5cd2643275/Documentation/kube-flannel.yml and https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml but after apply the yml file , the core-dns is in CrashLoopBackOff state.

[chrisohaver]

Are there any errors in coredns logs?

[heidini]

FIXED by:

kubectl edit cm coredns -n kube-system

and then comment loop:

#loop

[chrisohaver]

Take care that you don't actually have an upstream dns forwarding loop in place (e.g. if coredns is configured to forward upstream requests back to itself).

[fabriziopandini]

closing as per comment @heidini comment
/close

[k8s-ci-robot]

@fabriziopandini: Closing this issue.

In response to this:

closing as per comment @heidini comment
/close

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[oxful]

good

[naveen-e-git]

kubectl version
Client Version: version.Info{Major:"1", Minor:"14", GitVersion:"v1.14.2", GitCommit:"66049e3b21efe110454d67df4fa62b08ea79a19b", GitTreeState:"clean", BuildDate:"2019-05-16T16:23:09Z", GoVersion:"go1.12.5", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"14", GitVersion:"v1.14.2", GitCommit:"66049e3b21efe110454d67df4fa62b08ea79a19b", GitTreeState:"clean", BuildDate:"2019-05-16T16:14:56Z", GoVersion:"go1.12.5", Compiler:"gc", Platform:"linux/amd64"}
root@kmaster:#
root@kmaster:# cat /etc/os-release
NAME="Ubuntu"
VERSION="16.04.6 LTS (Xenial Xerus)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 16.04.6 LTS"
VERSION_ID="16.04"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"
VERSION_CODENAME=xenial
UBUNTU_CODENAME=xenial

Linux kmaster 4.4.0-143-generic #169-Ubuntu SMP Thu Feb 7 07:56:38 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux