kubeadm blocks waiting for 'waiting for the control plane to become ready'

[jiaqizho]

i saw the issue #33544 and all the issue about this question. but it not work ! i have no method to hand it .

Environment:

kubernetes-dashboard-amd64:v1.4.0

[root@hostname kubernetes-dashboard]# kubectl version
Client Version: version.Info{Major:"1", Minor:"4", GitVersion:"v1.4.1", GitCommit:"33cf7b9acbb2cb7c9c72a10d6636321fb180b159", GitTreeState:"clean", BuildDate:"2016-10-10T18:19:49Z", GoVersion:"go1.6.3", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"4", GitVersion:"v1.4.1", GitCommit:"33cf7b9acbb2cb7c9c72a10d6636321fb180b159", GitTreeState:"clean", BuildDate:"2016-10-10T18:13:36Z", GoVersion:"go1.6.3", Compiler:"gc", Platform:"linux/amd64"}

Operating system: CentOS 7

when i cmd :
kubeadm init

then it output:

[root@hostname calico]# kubeadm init
Running pre-flight checks
<master/tokens> generated token: "c0fe76.eca2db20ad994059"
<master/pki> generated Certificate Authority key and certificate:
Issuer: CN=kubernetes | Subject: CN=kubernetes | CA: true
Not before: 2016-10-27 07:25:30 +0000 UTC Not After: 2026-10-25 07:25:30 +0000 UTC
Public: /etc/kubernetes/pki/ca-pub.pem
Private: /etc/kubernetes/pki/ca-key.pem
Cert: /etc/kubernetes/pki/ca.pem
<master/pki> generated API Server key and certificate:
Issuer: CN=kubernetes | Subject: CN=kube-apiserver | CA: false
Not before: 2016-10-27 07:25:30 +0000 UTC Not After: 2017-10-27 07:25:31 +0000 UTC
Alternate Names: [10.0.2.15 10.0.0.1 kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local]
Public: /etc/kubernetes/pki/apiserver-pub.pem
Private: /etc/kubernetes/pki/apiserver-key.pem
Cert: /etc/kubernetes/pki/apiserver.pem
<master/pki> generated Service Account Signing keys:
Public: /etc/kubernetes/pki/sa-pub.pem
Private: /etc/kubernetes/pki/sa-key.pem
<master/pki> created keys and certificates in "/etc/kubernetes/pki"
<util/kubeconfig> created "/etc/kubernetes/kubelet.conf"
<util/kubeconfig> created "/etc/kubernetes/admin.conf"
<master/apiclient> created API client configuration
<master/apiclient> created API client, waiting for the control plane to become ready

it blocked at waiting for the control plane to become ready.

then i get the pods

[root@hostname kubernetes-dashboard]# kubectl get pods --namespace=kube-system
NAME                                    READY     STATUS              RESTARTS   AGE
etcd-hostname                           1/1       Running             6          1h
kube-apiserver-hostname                 1/1       Running             2          1h
kube-controller-manager-hostname        1/1       Running             1          1h
kube-scheduler-hostname                 1/1       Running             1          1h
kubernetes-dashboard-1655269645-pyxlv   0/1       ContainerCreating   0          44m
weave-net-8kxdo                         2/2       Running             14         45m

the wave is i created after cmd kubeadm

i have already closed the selinux . and set the proxy in shell(/etc/profile) and docker(systemd).

what fuck going on ???

[jiaqizho]

or is k8s not support at virtualbox machine ?
i got lots of question at virtualbox , i have build k8s at coreos on virtualbox , it comes lots of problem too.

[brightzheng100]

Same issue in my Ubuntu 16 64bit.

bright@ubuntu16:~$ sudo docker version
Client:
 Version:      1.12.3
 API version:  1.24
 Go version:   go1.6.3
 Git commit:   6b644ec
 Built:        Wed Oct 26 22:01:48 2016
 OS/Arch:      linux/amd64

Server:
 Version:      1.12.3
 API version:  1.24
 Go version:   go1.6.3
 Git commit:   6b644ec
 Built:        Wed Oct 26 22:01:48 2016
 OS/Arch:      linux/amd64

bright@ubuntu16:~$ kubeadm version
kubeadm version: version.Info{Major:"1", Minor:"5+", GitVersion:"v1.5.0-alpha.0.1534+cf7301f16c0363-dirty", GitCommit:"cf7301f16c036363c4fdcb5d4d0c867720214598", GitTreeState:"dirty", BuildDate:"2016-09-27T18:10:39Z", GoVersion:"go1.6.3", Compiler:"gc", Platform:"linux/amd64"}

While issuing kubeadm init, it would be hung at "waiting for the control plane to become ready":

bright@ubuntu16:~$ sudo kubeadm init
<master/tokens> generated token: "efd816.3d733107e08dccd0"
<master/pki> created keys and certificates in "/etc/kubernetes/pki"
<util/kubeconfig> created "/etc/kubernetes/admin.conf"
<util/kubeconfig> created "/etc/kubernetes/kubelet.conf"
<master/apiclient> created API client configuration
<master/apiclient> created API client, waiting for the control plane to become ready

[yamnicz3k]

I had similar problem.

# kubeadm version
kubeadm version: version.Info{Major:"1", Minor:"5+", GitVersion:"v1.5.0-alpha.0.1534+cf7301f16c0363-dirty", GitCommit:"cf7301f16c036363c4fdcb5d4d0c867720214598", GitTreeState:"dirty", BuildDate:"2016-09-27T18:10:39Z", GoVersion:"go1.6.3", Compiler:"gc", Platform:"linux/amd64"}

# docker version
Client:
 Version:      1.12.3
 API version:  1.24
 Go version:   go1.6.3
 Git commit:   6b644ec
 Built:        
 OS/Arch:      linux/amd64

Server:
 Version:      1.12.3
 API version:  1.24
 Go version:   go1.6.3
 Git commit:   6b644ec
 Built:        
 OS/Arch:      linux/amd64

My infrastructure is behind proxy, so i had to add proxy conf to my docker systemd service and restart it.

Kubernetes cluster on docker 1.12.3 works fine now.

[jiaqizho]

i find that maybe the k8s version 1.4 is not work.
then i change it to 1.4.1 and it worked .

[luxas]

If this issue exists with kubeadm v1.6 as well, please reopen an issue in the https://github.com/kubernetes/kubeadm/issues repo