一、先決條件

1、首先你必有現成的Kubernetes集群，如果現在你一無所有，請參考：

http://zlyang.blog.51cto.com/1196234/1951010

2、建議采用etcd集群，搭建過程請參考：

http://zlyang.blog.51cto.com/1196234/1951164

二、部署Kubernetes-dashboard

[所有機器：Master、Node1、Node2]

1、安裝flannel(flannel為管理Containers網絡)

[[email protected] ~]# yum -y install epel-release flannel

2、配置flanel

[Master]

[[email protected] ~]# vim /etc/sysconfig/flanneld

# Flanneld configuration options

# etcd url location. Point this to the server where etcd runs

FLANNEL_ETCD_ENDPOINTS="http://k8s-master:2379"

# etcd config key. This is the configuration key that flannel queries

# For address range assignment

FLANNEL_ETCD_PREFIX="/atomic.io/network"

# Any additional options that you want to pass

#FLANNEL_OPTIONS=""

[Node]

[[email protected] ~]# vim /etc/sysconfig/flanneld

# Flanneld configuration options

# etcd url location. Point this to the server where etcd runs

FLANNEL_ETCD_ENDPOINTS="http://k8s-master:2379"

# etcd config key. This is the configuration key that flannel queries

# For address range assignment

FLANNEL_ETCD_PREFIX="/atomic.io/network"

# Any additional options that you want to pass

#FLANNEL_OPTIONS=""

3、添加Etcd網絡配置

[Master]

[[email protected] ~]# mkdir -p /atomic.io/network/

[[email protected] ~]# chmod -R 777 /atomic.io

[[email protected] ~]# etcdctl mk /atomic.io/network/config ‘{"Network":"10.254.0.0/16"}‘

****** 註：此IP為/etc/kubernetes/apiserver中｛KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16" ｝填寫的地址

4、啟動flannel服務

[所有機器]

[[email protected] ~]# systemctl start flanneld.service

[[email protected] ~]# systemctl enable flanneld.service

5、修改Kubernetes所有Node節點kubelet設置中添加dns信息，否則會報錯

[Node1/Node2]

[[email protected] ~]# vim /etc/kubernetes/kubelet

###

# kubernetes kubelet (minion) config

# The address for the info server to serve on (set to 0.0.0.0 or "" for all interfaces)

KUBELET_ADDRESS="--address=0.0.0.0"

# The port for the info server to serve on

KUBELET_PORT="--port=10250"

# You may leave this blank to use the actual hostname

KUBELET_HOSTNAME="--hostname-override=k8s-node1"

# location of the api-server

KUBELET_API_SERVER="--api-servers=http://k8s-master:8080"

# pod infrastructure container

KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"

# Add your own!

#KUBELET_ARGS=""

KUBELET_ARGS="--cluster-dns=223.5.5.5 --cluster-domain=k8s-master"

6、重啟Node上的服務

[Master]

for SERVICES in flanneld etcd kube-apiserver kube-controller-manager kube-scheduler; do systemctl restart $SERVICES; systemctl enable $SERVICES; systemctl status $SERVICES ; done

[Node]

for SERVICES in flanneld kube-proxy kubelet docker; do systemctl restart $SERVICES; systemctl enable $SERVICES; systemctl status $SERVICES ; done

7、安裝dashboard

[Node1/Node2]

a、導入images

***由於墻的原因，需要先導入images，如果你可以翻墻，忽略此步驟

下載地址：

b、導入：

[[email protected] ~]# docker load < kubernetes-dashboard.tar.gz

c、查看

[[email protected] ~]# docker images

REPOSITORY TAG IMAGE ID CREATED SIZE

gcr.io/google_containers/kubernetes-dashboard-amd64 v1.6.2 bd4d50b8499e 8 days ago 139 MB

8、創建dashboard容器

[Master]

a、下載kubernetes-dashboar.yaml文件

[[email protected] ~]# git clone https://github.com/jdedu/kubernetes.git

b、修改其中標紅項

[[email protected] ~]# vim kubernetes/kubernetes-dashboard.yaml

kind: Deployment

apiVersion: extensions/v1beta1

metadata:

labels:

app: kubernetes-dashboard

version: v1.1.1

name: kubernetes-dashboard

namespace: kube-system

spec:

replicas: 1

selector:

matchLabels:

app: kubernetes-dashboard

template:

metadata:

labels:

app: kubernetes-dashboard

spec:

containers:

- name: kubernetes-dashboard

image: gcr.io/google_containers/kubernetes-dashboard-amd64:v1.6.2

imagePullPolicy: Always

ports:

- containerPort: 9090

protocol: TCP

args:

- --apiserver-host=http://192.168.80.130:8080

livenessProbe:

httpGet:

path: /

port: 9090

initialDelaySeconds: 30

timeoutSeconds: 30

---

kind: Service

apiVersion: v1

metadata:

labels:

app: kubernetes-dashboard

name: kubernetes-dashboard

namespace: kube-system

spec:

type: NodePort

ports:

- port: 80

targetPort: 9090

selector:

app: kubernetes-dashboard

9、創建dashboard容器

[Master]

[[email protected] ~]# kubectl create -f kubernetes-dashboard.yaml

deployment "kubernetes-dashboard" created

service "kubernetes-dashboard" created

10、查看狀態

a、查看pods

[[email protected] ~]# kubectl get pods --namespace=kube-system

NAME READY STATUS RESTARTS AGE

kubernetes-dashboard-1607234690-3bnk2 0/1 ContainerCreating 0 34s

b、查看構建詳細信息

[[email protected] ~]# kubectl describe pods kubernetes-dashboard-1607234690-3bnk2 --namespace=kube-system

Name: kubernetes-dashboard-1607234690-3bnk2

Namespace: kube-system

Node: k8s-node2/192.168.80.132

Start Time: Thu, 03 Aug 2017 17:15:50 +0800

Labels: app=kubernetes-dashboard

pod-template-hash=1607234690

Status: Pending

IP:

Controllers: ReplicaSet/kubernetes-dashboard-1607234690

Containers:

kubernetes-dashboard:

Container ID:

Image: gcr.io/google_containers/kubernetes-dashboard-amd64:v1.6.2

Image ID:

Port: 9090/TCP

Args:

--apiserver-host=http://192.168.80.130:8080

State: Waiting

Reason: ContainerCreating

Ready: False

Restart Count: 0

Liveness: http-get http://:9090/ delay=30s timeout=30s period=10s #success=1 #failure=3

Volume Mounts: <none>

Environment Variables: <none>

Conditions:

Type Status

Initialized True

Ready False

PodScheduled True

No volumes.

QoS Class: BestEffort

Tolerations: <none>

Events:

FirstSeen LastSeen Count From SubObjectPath Type Reason Message

--------- -------- ----- ---- ------------- -------- ------ -------

2m 2m 1 {default-scheduler } Normal Scheduled Successfully assigned kubernetes-dashboard-1607234690-3bnk2 to k8s-node2

三、測試

a、在測試機上添加host信息

192.168.80.130 k8s-master

b、使用瀏覽器輸入:http://k8s-master:8080/ui

四、錯誤

[錯誤1]

[[email protected] ~]# kubectl describe pods kubernetes-dashboard-1607234690-3bnk2 --namespace=kube-system

1s 1s 1 {kubelet k8s-node2} Warning FailedSync Error syncing pod, skipping: failed to "StartContainer" for "kubernetes-dashboard" with CrashLoopBackOff: "Back-off 10s restarting failed container=kubernetes-dashboard pod=kubernetes-dashboard-980055440-l9zl5_kube-system(870d02e1-7810-11e7-9517-000c296a54e8)"

再次使用kubectl logs查看具體錯誤信息

[[email protected] ~]# kubectl logs kubernetes-dashboard-1607234690-l6gfk --namespace=kube-system

No request provided. Skipping authorization header

Error while initializing connection to Kubernetes apiserver. This most likely means that the cluster is misconfigured (e.g., it has invalid apiserver certificates or service accounts configuration) or the --apiserver-host param points to a server that does not exist. Reason: Get http://k8s-master:8080/version: dial tcp: lookup k8s-master on 223.5.5.5:53: no such host

Refer to the troubleshooting guide for more information: https://github.com/kubernetes/dashboard/blob/master/docs/user-guide/troubleshooting.md

[解決方案]

[[email protected] ~]# vim kubenetes-dashboard.yaml

- --apiserver改成ip，不要使用域名

此過程中可能會遇到很多問題，如果需要幫助，請發郵件至：[email protected]

本文出自 “Elephant” 博客，請務必保留此出處http://zlyang.blog.51cto.com/1196234/1953399

CentOS7搭建Kubernetes-dashboard管理服務