k8s的快速使用手冊

1、快速搭建文檔

1、初始化kubernete
kubeadm init --kubernetes-version=v1.14.0  --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=192.168.10.12 --image-repository=registry.cn-hangzhou.aliyuncs.com/google_containers
....
To start using your cluster, you need to run the following as a regular user:

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
  https://kubernetes.io/docs/concepts/cluster-administration/addons/

Then you can join any number of worker nodes by running the following on each as root:

kubeadm join 192.168.10.12:6443 --token 3s24j5.nh1fqex8kmekpmtf \
    --discovery-token-ca-cert-hash sha256:62bcc3a657fd97cd6d5da14b293912234f0f14512bb4bf8d8be1023a69fc6f17
==========================
2、安裝flannel網絡
wget https://raw.githubusercontent.com/loverying/mykubernetes/master/kubect_install/kube-flannel.yaml
[root@master kubectyaml]# kubectl apply -f kube-flannel.yaml 
podsecuritypolicy.extensions/psp.flannel.unprivileged created
clusterrole.rbac.authorization.k8s.io/flannel created
clusterrolebinding.rbac.authorization.k8s.io/flannel created
serviceaccount/flannel created
configmap/kube-flannel-cfg created
daemonset.extensions/kube-flannel-ds-amd64 created
daemonset.extensions/kube-flannel-ds-arm64 created
daemonset.extensions/kube-flannel-ds-arm created
daemonset.extensions/kube-flannel-ds-ppc64le created
daemonset.extensions/kube-flannel-ds-s390x created
[root@master kubectyaml]# kubectl get nodes
NAME     STATUS   ROLES    AGE     VERSION
master   Ready    master   2m43s   v1.14.2
3、其餘機器加入集羣
kubeadm join 192.168.10.12:6443 --token 3s24j5.nh1fqex8kmekpmtf \
    --discovery-token-ca-cert-hash sha256:62bcc3a657fd97cd6d5da14b293912234f0f14512bb4bf8d8be1023a69fc6f17
[root@master kubectyaml]# kubectl get nodes
NAME     STATUS   ROLES    AGE    VERSION
master   Ready    master   4m3s   v1.14.2
node01   Ready    <none>   27s    v1.14.2
node02   Ready    <none>   22s    v1.14.2
4、部署 dashboard
wget https://raw.githubusercontent.com/loverying/mykubernetes/master/kubect_install/dashboard-admin_new.yaml
wget https://raw.githubusercontent.com/loverying/mykubernetes/master/kubect_install/kubernetes-dashboard.yaml
kubectl apply -f dashboard-admin_new.yaml
kubectl apply -f kubernetes-dashboard.yaml
5、部署ingress-nginx
wget https://raw.githubusercontent.com/loverying/mykubernetes/master/kubect_install/mandatory.yaml
kubectl apply -f mandatory.yaml

6、部署應用
    1）部署pod        提供後端服務
    2）部署service   是作負載均衡
    3）部署ingress-nginx   將負載均衡綁定在域名上

7、部署普羅米修斯監控（研究）

8、日誌收集平臺（研究）
    EFK平臺

View Code

 2、部署應用

1.1）部署pod

apiVersion: apps/v1
kind: ReplicaSet
metadata:
  name: myapp
  namespace: default
  labels:
    app: myapp
spec:
  replicas: 2
  selector:
    matchLabels:
      app: myapp
  template:
    metadata:
      name: myapp-pod
      labels:
        app: myapp
    spec:  
      containers:
      - name: myapp
        image: ikubernetes/myapp:v1
        ports:
        - name: http
          containerPort: 80

mypod.yaml

1.2）訪問效果

[root@master ~]# kubectl get pods -o wide
NAME          READY   STATUS    RESTARTS   AGE   IP           NODE     NOMINATED NODE   READINESS GATES
myapp-8w7bm   1/1     Running   0          10m   10.244.2.7   node02   <none>           <none>
myapp-n4xhs   1/1     Running   0          10m   10.244.1.8   node01   <none>           <none>
[root@master ~]# curl 10.244.2.7/hostname.html
myapp-8w7bm
[root@master ~]# curl 10.244.1.8/hostname.html
myapp-n4xhs

 2.1）建立service

apiVersion: v1
kind: Service
metadata:
  name: myapp
  namespace: default
spec:
  selector:
    app: myapp
  clusterIP: 10.99.99.99
  type: NodePort
  ports:
  - port: 80
    targetPort: 80
    nodePort: 30080

svc_mypod.yaml

2.2) 訪問效果

[root@master ~]# kubectl get svc -o wide
NAME         TYPE        CLUSTER-IP    EXTERNAL-IP   PORT(S)        AGE     SELECTOR
kubernetes   ClusterIP   10.96.0.1     <none>        443/TCP        3h10m   <none>
myapp        NodePort    10.99.99.99   <none>        80:30080/TCP   8m15s   app=myapp
[root@master ~]# while true;do curl 192.168.10.12:30080/hostname.html;sleep 1;done
myapp-8w7bm
myapp-n4xhs
myapp-n4xhs
myapp-8w7bm
myapp-8w7bm

 3.1）建立 ingress

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: ingress-myapp
  namespace: default
  annotations:
    kubernetes.io/ingress.class: "nginx"
spec:
  rules:
  - host: master.com
    http:
      paths:
      - backend:
          serviceName: myapp
          servicePort: 30080

ingress_pod.yaml

3.2 ) 訪問效果測試

[root@master ~]# kubectl get ingress
NAME            HOSTS        ADDRESS   PORTS   AGE
ingress-myapp   master.com             80      10m
[root@master ~]# kubectl describe ingress ingress-myapp
.......
[root@master ~]# while true;do curl master.com:30080/hostname.html;sleep 1;done
myapp-8w7bm
myapp-n4xhs
myapp-n4xhs
myapp-8w7bm

3、資源獲取（metrics-server）

 1）安裝metrics-server

https://github.com/baishuchao/kubernetes/tree/master/metrics-server
[root@ks-master k8s]# git clone https://github.com/baishuchao/kubernetes.git
[root@ks-master k8s]# cd kubernetes/metrics-server
[root@ks-master metrics-server]#kubectl apply -f .

2）資源獲取示例

[root@master dashboard]# kubectl top pods -n kube-system
NAME                                   CPU(cores)   MEMORY(bytes)   
coredns-d5947d4b-45r9x                 5m           15Mi            
coredns-d5947d4b-snsjt                 6m           15Mi            
etcd-master                            53m          145Mi           
kube-apiserver-master                  83m          276Mi           
kube-controller-manager-master         23m          54Mi            
kube-flannel-ds-amd64-x6pcr            2m           16Mi            
kube-flannel-ds-amd64-xntt5            4m           18Mi            
kube-flannel-ds-amd64-zsq6r            4m           20Mi            
kube-proxy-v67qd                       12m          20Mi            
kube-proxy-zg6ws                       9m           20Mi            
kube-proxy-zkmgh                       9m           24Mi            
kube-scheduler-master                  2m           18Mi            
kubernetes-dashboard-b6dcb8878-ckcz5   0m           0Mi             
metrics-server-7579f696d8-kv8hs        1m           14Mi