simple Kubernetes pod中的java.net.SocketException

Question

SocketException：在简单的Kubernetes pod中无法访问网络（连接失败），它可以卷曲到Internet。

java.net.SocketException: Network is unreachable (connect failed)
    at java.base/java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:399)
    at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:242)
    at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:224)
    at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.base/java.net.Socket.connect(Socket.java:609)
    at okhttp3.internal.platform.Platform.connectSocket(Platform.kt:120)

apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: my-app-job
spec:
  schedule: "*/1 * * * *"
  jobTemplate:
    spec:
      template:
        spec:
          containers:
            - name: name
              image: myimage
              imagePullPolicy: Always
              ports:
                - containerPort: 443
                  protocol: TCP
                - containerPort: 80
                  protocol: TCP
              env:
                - name: http_proxy
                  value: myproxy
                - name: https_proxy
                  value: myproxy
                - name: no_proxy
                  value: myproxy
          restartPolicy: OnFailure

bash-4.2$ ping www.google.com
ping: socket: Operation not permitted
bash-4.2$ curl -I www.google.com
HTTP/1.1 200 OK
content-type: text/html; charset=ISO-8859-1
p3p: CP="This is not a P3P policy! See g.co/p3phelp for more info."
date: Wed, 29 Sep 2021 09:18:36 GMT
server: gws
x-xss-protection: 0
x-frame-options: SAMEORIGIN
expires: Wed, 29 Sep 2021 09:18:36 GMT
cache-control: private
set-cookie: XXXXXXXXXXX
expires=Thu, 31-Mar-2022 09:18:36 GMT; path=/; domain=.google.com; HttpOnly
x-cache: MISS from XXXXXXXXXXX
x-cache-lookup: MISS fXXXXXXXXX

bash-4.2$ command terminated with exit code 137

Answer 1

Java不会从环境中继承代理设置。

您需要使用Java系统属性指定代理

-Dhttp.proxyHost=locahost -Dhttp.proxyPort=9900