How could a spring-boot application determine if it is running on cloud foundry? - mongodb

Question

I'm writting a micro service with spring-boot. The db is mongodb. The service works perfectly in my local environment. But after I deployed it to the cloud foundry it doesn't work. The reason is connecting mongodb time out.
I think the root cause is the application doesn't know it is running on cloud. Because it still connecting 127.0.0.1:27017, but not the redirected port.
How could it know it is running on cloud? Thank you!
EDIT:
There is a mongodb instance bound to the service. And when I checked the environment information, I got following info:
{
"VCAP_SERVICES": {
"mongodb": [
{
"credentials": {
"hostname": "10.11.241.1",
"ports": {
"27017/tcp": "43417",
"28017/tcp": "43135"
},
"port": "43417",
"username": "xxxxxxxxxx",
"password": "xxxxxxxxxx",
"dbname": "gwkp7glhw9tq9cwp",
"uri": "xxxxxxxxxx"
},
"syslog_drain_url": null,
"volume_mounts": [],
"label": "mongodb",
"provider": null,
"plan": "v3.0-container",
"name": "mongodb-business-configuration",
"tags": [
"mongodb",
"document"
]
}
]
}
}
{
"VCAP_APPLICATION": {
"cf_api": "xxxxxxxxxx",
"limits": {
"fds": 16384,
"mem": 1024,
"disk": 1024
},
"application_name": "mock-service",
"application_uris": [
"xxxxxxxxxx"
],
"name": "mock-service",
"space_name": "xxxxxxxxxx",
"space_id": "xxxxxxxxxx",
"uris": [
"xxxxxxxxxx"
],
"users": null,
"application_id": "xxxxxxxxxx",
"version": "c7569d23-f3ee-49d0-9875-8e595ee76522",
"application_version": "c7569d23-f3ee-49d0-9875-8e595ee76522"
}
}
From my understanding, I think my spring-boot service should try to connect the port 43417 but not 27017, right? Thank you!

Answer 1

Finally I found the reason is I didn't specify the profile. After adding following code in my manifest.yml it works:
env:
SPRING_PROFILES_ACTIVE: cloud