/network-demo

Primary LanguageJava

About this App

Upon startup, this app immediately attempts to open outgoing HTTP connections to CAPI and to example.com.

See src/main/java/com/example/demo/DemoApplication.java for implementation.

This app exists to demonstrate that these outgoing connections do not work reliably on cf-for-k8s v0.1.0.

Steps to Reproduce

  1. Clone this repo. We'll assume that you cloned it to /Users/pivotal/workspace/network-demo for the rest of this doc.

  2. Compile the app. Don't forget to repeat this step each time you change the code while debugging.

    cd /Users/pivotal/workspace/network-demo
./mvnw install

  3. When pushing this app to cf-for-k8s, both outgoing connections fail 16 out of 20 times during app startup using the following loop:

    for i in {1..20}; do echo "Running attempt #$i"; cf delete -f network-demo; cf push network-demo -p /Users/pivotal/workspace/network-demo/target/demo-0.0.1-SNAPSHOT.jar; kubectl logs $(kubectl get pods -n cf-workloads | grep network-demo | cut -d' ' -f1) -n cf-workloads -c opi; done

    Outgoing connections to CAPI and to example.com will either both fail or both succeed.

    When they fail, the exception for each outgoing connection is:

    java.net.ConnectException: Connection refused (Connection refused)
    at java.base/java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.base/java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
    at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
    at java.base/java.net.AbstractPlainSocketImpl.connect(Unknown Source)
    at java.base/java.net.SocksSocketImpl.connect(Unknown Source)
    at java.base/java.net.Socket.connect(Unknown Source)
    at java.base/sun.security.ssl.SSLSocketImpl.connect(Unknown Source)
    at java.base/sun.security.ssl.SSLSocketImpl.<init>(Unknown Source)
    at java.base/sun.security.ssl.SSLSocketFactoryImpl.createSocket(Unknown Source)
    at com.example.demo.DemoApplication.connectTo(DemoApplication.java:32)
    at com.example.demo.DemoApplication.main(DemoApplication.java:18)

  4. Note that sleeping for 2 seconds upon app startup before trying to open the sockets causes the outgoing connections to be successful more reliably, e.g. did not fail in 20 attempts using the same for loop command as above.

Desired Behavior

These outgoing HTTP requests should not always fail for the first few seconds of the app's run.