查看“K8s实践指南”的源代码

==深入service==

=== 集群外部访问pod or service===

====将容器应用的端口映射到物理机 ====
<pre>
1. hostPort

cat  pod-hostport.yaml
apiVersion: v1
kind: Pod
metadata:
  name:  webapp 
  labels:
    app: webapp
spec:
  containers:
  - name: webapp
    image: tomcat
    ports: 
    - containerPort: 8080 
      hostPort: 8081 

 kubectl create -f  pod-hostport.yaml

#是没有反应的 哈哈
sudo netstat   -nlpt  | grep 8081

#此处masterip 为192.168.88.58

http://192.168.88.58:8081/


2.hostNetwork: true

cat  pod-hostport.yaml 
apiVersion: v1
kind: Pod
metadata:
  name:  webapp 
  labels:
    app: webapp
spec:
  hostNetwork: true
  containers:
  - name: webapp
    image: tomcat
    ports: 
    - containerPort: 8080 


sudo netstat   -nlpt  | grep 808
tcp6       0      0 :::8080                 :::*                    LISTEN      28100/java


http://192.168.88.58:8080/


</pre>
==== service的端口映射到物理机====
<pre>
1. Nodeport

cat  pod-hostport.yaml
apiVersion: v1
kind: Pod
metadata:
  name:  webapp 
  labels:
    app: webapp
spec:
  type: NodePort
  - name: webapp
    image: tomcat
    ports: 
    - port: 8080 
      targetPort: 8080
      NodePort: 8081 
  selector:
    app: webapp


http://192.168.88.58:8081



2. 映射到云服务器提供商的loadbalancer 地址

</pre>




=DigitalOcean k8s=
[https://blog.csdn.net/cpongo4/article/details/89146967 DigitalOcean推出托管Kubernetes服务]


https://cloud.digitalocean.com/kubernetes/clusters?i=d097a0

可以测试在这上面买二到三台机器 比vultr便宜 不一定呢 

[https://juejin.im/post/5caa00346fb9a05e677e8c52 在DigitalOcean玩Kubernetes(K8S)]

=see also=
[https://www.jianshu.com/p/c01ba5bd1359?utm_campaign=maleskine&utm_content=note&utm_medium=seo_notes&utm_source=recommendation 安装k8s Master高可用集群]

 [[category:k8s]]