配置kubernetes UI图形化界面

配置Kubernetes网络

• 在master和nodes上都需要安装flannel

yum install flannel

• 在master和nodes上都需要配置flannel

vi /etc/sysconfig/flanneld

# Flanneld configuration options

# etcd url location. Point this to the server where etcd runs
FLANNEL_ETCD_ENDPOINTS="http://etcd: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=""

• 配置etcd中flannel的key,需要在etcd中进行配置

etcdctl mk /atomic.io/network/config '{ "Network": "192.168.0.0/16" }'

• 启动

在master节点上启动

systemctl enable flanneld.service 
systemctl start flanneld.service 
service docker restart
systemctl restart kube-apiserver.service
systemctl restart kube-controller-manager.service
systemctl restart kube-scheduler.service

在各个Nodes上启动

systemctl enable flanneld.service 
systemctl start flanneld.service 
service docker restart
systemctl restart kubelet.service
systemctl restart kube-proxy.service

运行 kubectl get pods --all-namespaces -o wide 看获取的ip地址是否正确

 编辑一个kubernetes-dashboard.yaml文件

最新版本可以去官网下载

https://github.com/kubernetes/dashboard/blob/master/src/deploy/kubernetes-dashboard.yaml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
# Keep the name in sync with image version and
# gce/coreos/kube-manifests/addons/dashboard counterparts
  name: kubernetes-dashboard-latest
  namespace: kube-system
spec:
  replicas: 1
  template:
    metadata:
      labels:
        k8s-app: kubernetes-dashboard
        version: latest
        kubernetes.io/cluster-service: "true"
    spec:
      containers:
      - name: kubernetes-dashboard
        image: gcr.io/google_containers/kubernetes-dashboard-amd64:v1.5.1
        resources:
          # keep request = limit to keep this container in guaranteed class
          limits:
            cpu: 100m
            memory: 50Mi
          requests:
            cpu: 100m
            memory: 50Mi
        ports:
        - containerPort: 9090
        args:
         -  --apiserver-host=http://10.182.169.33:8080
        livenessProbe:
          httpGet:
            path: /
            port: 9090
          initialDelaySeconds: 30
          timeoutSeconds: 30
---
kind: Service
metadata:
  name: kubernetes-dashboard
  namespace: kube-system
  labels:
    k8s-app: kubernetes-dashboard
    kubernetes.io/cluster-service: "true"
spec:
  selector:
    k8s-app: kubernetes-dashboard
  ports:
  - port: 80
    targetPort: 9090

注意修改--apiserver-host=http://10.182.169.33:8080 指向自己的api server.

创建dashboard 

kubectl create -f kubernetes-dashboard.yaml

kubectl get  -f kubernetes-dashboard.yaml 

发现deploy/kubernetes-dashboard-latest一直不在avaiable状态,通过下面命令查询

kubectl get pods --all-namespaces

发现kube-system的命名空间下,总是有个kubernetes-dashboard-latest-1590787137-pp8qd处于CrashLoopBackOff状态.

可以通过下面命令查看namespace的日志情况

kubectl describe po kubernetes-dashboard --namespace=kube-system

删除kubernetes-dashboard

因为没搞清楚什么原因,很想再试一次,删除命令如下:

kubectl delete -f kubernetes-dashboard.yaml

在运行kubectl get pods --all-namespaces发现总是有kube-system命名空间下的pod在运行.最后通过指定命名空间删除

kubectl delete --all pods --namespace=kube-system

kubectl delete deployment kubernetes-dashboard --namespace=kube-system

注意,如果只删除pod会发现删完后又会有个同样的pod启动起来,删除deployment即可.

查看日志确定原因

最重要还是要看日志，最重要还是要看日志，最重要还是要看日志， 重要事情说三遍，此问题浪费3个钟头时间 :(

kubectl logs -f kubernetes-dashboard-latest-3243398-thc7k -n kube-system

[root@k8s-master ~]# kubectl logs -f kubernetes-dashboard-latest-3243398-thc7k -n kube-system
Using HTTP port: 9090
Using apiserver-host location: http://k8s-master:8080
Creating API server client for http://k8s-master:8080
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 202.96.134.33:53: no such host
Refer to the troubleshooting guide for more information: https://github.com/kubernetes/dashboard/blob/master/docs/user-guide/troubleshooting.md

发现是dns把k8s-master解析成202.96.134.33的地址了,修改kubernetes-dashboard.yaml中的apiserver-host=http://k8s-master:8080为

http://192.168.0.104:8080后,再进行create就成功.

访问http://192.168.0.104:8080/ui,界面如下:

 

点击weblogic Pod的日志,显示如下: