Changing Port no. on AppEngine Flex environment

[Abhishek Verma]

I want to run my spring boot application on port 8400. i configured server.port=8400 in application.properties. I gave following configuration:

<plugin>

<groupId>com.google.cloud.tools</groupId>

<artifactId>appengine-maven-plugin</artifactId>

<version>1.3.2</version>

<configuration>

<version>1</version>

<enableJarClasses>false</enableJarClasses>

<port>8400</port>

<host>0.0.0.0</host>

<admin_host>0.0.0.0</admin_host>

</configuration>

</plugin>

but its not working. it always hits 8080 from appspot.com. Please help. Also how can I run on random port ?

[George (Cloud Platform Support)]

Hello Abhishek, 

Where do you configure your port with the <plugin> markup? In Flexible Environment, the usual way to specify network settings is in your app.yaml configuration file, for example:

network:

  instance_tag: TAG_NAME

  name: NETWORK_NAME

  subnetwork_name: SUBNETWORK_NAME

  session_affinity: true

  forwarded_ports:

    - PORT

    - HOST_PORT:CONTAINER_PORT

    - PORT/tcp

    - HOST_PORT:CONTAINER_PORT/udp

You may check related information on the "Configuring your App with app.yaml" page.