How to start K8s after restart Ubuntu?

[wwwa...@gmail.com]

Hello,

I successfully installed K8s on my VB Ubuntu (Master and Node01). After installation I typed "kubectl get nodes" and got bot servers in status //Ready//. But after restart systems I got this:

# kc get nodes
The connection to the server localhost:8080 was refused - did you specify the right host or port?


I checked kubelet service and it is running:
kubelet.service - kubelet: The Kubernetes Node Agent
Loaded: loaded (/lib/systemd/system/kubelet.service; enabled; vendor preset: enabled)
Drop-In: /etc/systemd/system/kubelet.service.d
└─10-kubeadm.conf
Active: active (running) since Mon 2017-04-24 10:01:51 CEST; 15min ago
Docs: http://kubernetes.io/docs/
Main PID: 13128 (kubelet)
Tasks: 21
Memory: 48.2M
CPU: 58.014s
CGroup: /system.slice/kubelet.service
├─13128 /usr/bin/kubelet --kubeconfig=/etc/kubernetes/kubelet.conf --require-kubeconfig=true --pod-manifest-path=/etc/kubernetes/manifests --allow-privileged=true --cluster-dns=10.96.0.10 --cluster-domain=cluster.local
└─13164 journalctl -k -f

Apr 24 10:16:40 master kubelet[13128]: I0424 10:16:40.204156 13128 kuberuntime_manager.go:752] Back-off 5m0s restarting failed container=weave pod=weave-net-5qgvz_kube-system(4b7bb2f0-2691-11e7-bfb6-080027229776)
Apr 24 10:16:40 master kubelet[13128]: E0424 10:16:40.204694 13128 pod_workers.go:182] Error syncing pod 4b7bb2f0-2691-11e7-bfb6-080027229776 ("weave-net-5qgvz_kube-system(4b7bb2f0-2691-11e7-bfb6-080027229776)"), skipping: fail
Apr 24 10:16:42 master kubelet[13128]: I0424 10:16:42.972302 13128 operation_generator.go:597] MountVolume.SetUp succeeded for volume "kubernetes.io/secret/2b59d0d9-2692-11e7-bfb6-080027229776-default-token-h3v7c" (spec.Name: "
Apr 24 10:16:48 master kubelet[13128]: I0424 10:16:48.949731 13128 operation_generator.go:597] MountVolume.SetUp succeeded for volume "kubernetes.io/secret/2bb42bc1-2692-11e7-bfb6-080027229776-default-token-h3v7c" (spec.Name: "
Apr 24 10:16:51 master kubelet[13128]: I0424 10:16:51.978663 13128 operation_generator.go:597] MountVolume.SetUp succeeded for volume "kubernetes.io/secret/2b023c31-2692-11e7-bfb6-080027229776-default-token-h3v7c" (spec.Name: "
Apr 24 10:16:52 master kubelet[13128]: I0424 10:16:52.909589 13128 operation_generator.go:597] MountVolume.SetUp succeeded for volume "kubernetes.io/secret/4b7bb2f0-2691-11e7-bfb6-080027229776-default-token-gslqd" (spec.Name: "
Apr 24 10:16:53 master kubelet[13128]: I0424 10:16:53.186057 13128 kuberuntime_manager.go:458] Container {Name:weave Image:weaveworks/weave-kube:1.9.4 Command:[/home/weave/launch.sh] Args:[] WorkingDir: Ports:[] EnvFrom:[] Env:
Apr 24 10:16:53 master kubelet[13128]: I0424 10:16:53.188091 13128 kuberuntime_manager.go:742] checking backoff for container "weave" in pod "weave-net-5qgvz_kube-system(4b7bb2f0-2691-11e7-bfb6-080027229776)"
Apr 24 10:16:53 master kubelet[13128]: I0424 10:16:53.188717 13128 kuberuntime_manager.go:752] Back-off 5m0s restarting failed container=weave pod=weave-net-5qgvz_kube-system(4b7bb2f0-2691-11e7-bfb6-080027229776)
Apr 24 10:16:53 master kubelet[13128]: E0424 10:16:53.189136 13128 pod_workers.go:182] Error syncing pod 4b7bb2f0-2691-11e7-bfb6-080027229776 ("weave-net-5qgvz_kube-system(4b7bb2f0-2691-11e7-bfb6-080027229776)"), skipping: fail



Not sure what I missed. Can I ask you for help? :]



• Ubuntu version
cat /etc/os-release
NAME="Ubuntu"
VERSION="16.04.2 LTS (Xenial Xerus)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 16.04.2 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

• Kernel
# uname -a
Linux ubuntu 4.4.0-72-generic #93-Ubuntu SMP Fri Mar 31 14:07:41 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

• Kubectl version
# kubectl version
Client Version: version.Info{Major:"1", Minor:"6", GitVersion:"v1.6.1", GitCommit:"b0b7a323cc5a4a2019b2e9520c21c7830b7f708e", GitTreeState:"clean", BuildDate:"2017-04-03T20:44:38Z", GoVersion:"go1.7.5", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"6", GitVersion:"v1.6.0", GitCommit:"fff5156092b56e6bd60fff75aad4dc9de6b6ef37", GitTreeState:"clean", BuildDate:"2017-03-28T16:24:30Z", GoVersion:"go1.7.5", Compiler:"gc", Platform:"linux/amd64"}

• Kubeadm version
# kubeadm version
kubeadm version: version.Info{Major:"1", Minor:"6", GitVersion:"v1.6.1", GitCommit:"b0b7a323cc5a4a2019b2e9520c21c7830b7f708e", GitTreeState:"clean", BuildDate:"2017-04-03T20:33:27Z", GoVersion:"go1.7.5", Compiler:"gc", Platform:"linux/amd64"}

• Kubelet version
# kubelet --version
Kubernetes v1.6.1

• Docker version
# docker version
Client:
Version: 1.11.2
API version: 1.23
Go version: go1.5.4
Git commit: b9f10c9
Built: Wed Jun 1 22:00:43 2016
OS/Arch: linux/amd64

Server:
Version: 1.11.2
API version: 1.23
Go version: go1.5.4
Git commit: b9f10c9
Built: Wed Jun 1 22:00:43 2016
OS/Arch: linux/amd64

[wwwa...@gmail.com]

History of solution is possible to find in stackoverflow - http://stackoverflow.com/questions/43603545/kubernetes-does-not-start-after-restart-system-ubuntu.

In short: I had bad exported CUBECONFIG which is needed by kubelet.