安装报错了

[cncarefree]

Start to initialize Kubernetes master node...

(1/6) Start to load images for Kubernetes master...
(2/6) Start to install components for Kubernetes master...
(3/6) Start to configure firewall...
(4/6) Start to initialize Kubernetes master...
Exit Status: 2

✖ Failed to initialize Kubernetes master node...

[cncarefree]

install.log

Running transaction test
Transaction test succeeded
Running transaction
正在安装 : socat-1.7.3.2-2.el7.x86_64 1/5
正在安装 : kubernetes-cni-0.5.1-1.x86_64 2/5
正在安装 : kubelet-1.8.1-0.x86_64 3/5
正在安装 : kubectl-1.8.1-0.x86_64 4/5
正在安装 : kubeadm-1.8.1-0.x86_64 5/5
验证中 : kubectl-1.8.1-0.x86_64 1/5
验证中 : kubelet-1.8.1-0.x86_64 2/5
验证中 : socat-1.7.3.2-2.el7.x86_64 3/5
验证中 : kubernetes-cni-0.5.1-1.x86_64 4/5
验证中 : kubeadm-1.8.1-0.x86_64 5/5

已安装:
kubeadm.x86_64 0:1.8.1-0 kubectl.x86_64 0:1.8.1-0
kubelet.x86_64 0:1.8.1-0 kubernetes-cni.x86_64 0:0.5.1-1
socat.x86_64 0:1.7.3.2-2.el7

完毕！
KUBEKIT_OUTPUT (3/6) Start to configure firewall...
KUBEKIT_OUTPUT (4/6) Start to initialize Kubernetes master...
[kubeadm] WARNING: kubeadm is in beta, please do not use it for production clusters.
[init] Using Kubernetes version: v1.8.3
[init] Using Authorization modes: [Node RBAC]
[preflight] Running pre-flight checks

[TimothyYe]

暂时未能重现

[levonchen]

我也遇到了这个问题。没法启动master

Start to initialize Kubernetes master node...

(1/6) Start to load images for Kubernetes master...
(2/6) Start to install components for Kubernetes master...
(3/6) Start to configure firewall...
(4/6) Start to initialize Kubernetes master...
Exit Status: 2

✖ Failed to initialize Kubernetes master node...

运行 journalctl -xe 发现有下面的错误输出

Dec 12 13:50:17 centos-master kubelet[6093]: I1212 13:50:17.676233 6093 controller.go:118] kubelet config controller: validating combination of defaults and flags
Dec 12 13:50:17 centos-master kubelet[6093]: error: unable to load client CA file /etc/kubernetes/pki/ca.crt: open /etc/kubernetes/pki/ca.crt: no such file or directory
Dec 12 13:50:17 centos-master systemd[1]: kubelet.service: main process exited, code=exited, status=1/FAILURE
Dec 12 13:50:17 centos-master systemd[1]: Unit kubelet.service entered failed state.
Dec 12 13:50:17 centos-master systemd[1]: kubelet.service failed.

清空一下再试试看

[root@centos-master kubekit]# kubeadm reset
[preflight] Running pre-flight checks
[reset] Stopping the kubelet service
[reset] Unmounting mounted directories in "/var/lib/kubelet"
[reset] Removing kubernetes-managed containers
[reset] No etcd manifest found in "/etc/kubernetes/manifests/etcd.yaml", assuming external etcd.
[reset] Deleting contents of stateful directories: [/var/lib/kubelet /etc/cni/net.d /var/lib/dockershim /var/run/kubernetes]
[reset] Deleting contents of config directories: [/etc/kubernetes/manifests /etc/kubernetes/pki]
[reset] Deleting files: [/etc/kubernetes/admin.conf /etc/kubernetes/kubelet.conf /etc/kubernetes/controller-manager.conf /etc/kubernetes/scheduler.conf]

奇怪的是为什么没有创建 /etc/kubernetes 这个文件件

[levonchen]

重新清空了一下，再安装，dashboard起来了。非常感谢

[TimothyYe]

@levonchen kubeadm reset 可以清空K8S的组件

[levonchen]

kubekit 是不是默认就把dns安装，配置好了？ 但是我用busybox 试了一下，好像不起作用。
[root@centos-master kub]# kubectl get pods
NAME READY STATUS RESTARTS AGE
busybox 1/1 Running 0 2m
[root@centos-master kub]# kubectl exec -it busybox -- nslookup kubernetes.default
Server: 10.96.0.10
Address 1: 10.96.0.10

nslookup: can't resolve 'kubernetes.default'
command terminated with exit code 1

希望给点参考意见，还是我需要做额外的单独配置dns吗？

[root@centos-master kub]# kubectl get pods --namespace=kube-system
NAME READY STATUS RESTARTS AGE
etcd-centos-master 1/1 Running 0 1h
kube-apiserver-centos-master 1/1 Running 0 1h
kube-controller-manager-centos-master 1/1 Running 0 1h
kube-dns-545bc4bfd4-grftq 3/3 Running 0 1h
kube-flannel-ds-fqcnc 2/2 Running 1 47m
kube-flannel-ds-k8kd4 2/2 Running 1 47m
kube-flannel-ds-pbwsl 2/2 Running 1 1h
kube-proxy-jpxk8 1/1 Running 0 47m
kube-proxy-kxsx4 1/1 Running 0 1h
kube-proxy-vllgq 1/1 Running 0 47m
kube-scheduler-centos-master 1/1 Running 0 1h
kubernetes-dashboard-759ccc86d9-9w7hz 1/1 Running 0 1h

从输出看， dns应该是好的。

[TimothyYe]

k8s用kube-dns来解决服务发现的问题，service创建的时候，会把service名字注册到kube-dns中。
http://blog.tenxcloud.com/?p=1726

或者你先创建一个pod和service，然后再试试？

[rhettpang]

我也遇到这个问题，原因是我的hostname有下滑下（k8s_master）,改成k8s-master之后果断好了