Service discovery with eureka is not working in docker container - asp.net-core

Question

When I run my API gateway in docker container then it is not able to find my services which are registered in eureka.
API Gateway
-- ocelot.json
{
"ReRoutes": [
{
"DownstreamPathTemplate": "/api/values",
"DownstreamScheme": "http",
"UseServiceDiscovery": true,
"ServiceName": "sampleservice",
"UpstreamPathTemplate": "/sample-api/{catchAll}"
}
],
"GlobalConfiguration": {
"UseServiceDiscovery": true,
"ServiceDiscoveryProvider": {
"Type": "Eureka",
"Host": "myeurekaserver",
"Port": "8761"
}
}
}
-- appsettings.json for API Gateway
{
"eureka": {
"client": {
"shouldRegisterWithEureka": false,
"serviceUrl": "http://myeurekaserver:8761/eureka/",
"ValidateCertificates": false
},
"instance": {
"appName": "gateway",
"hostName": "myeurekaserver",
"port": "7000"
}
}
}
Service Configuration --appsettings.json
{
"eureka": {
"client": {
"shouldRegisterWithEureka": true,
"serviceUrl": "http://myeurekaserver:8761/eureka/",
"ValidateCertificates": false
},
"instance": {
"appName": "sampleservice",
"hostName": "myeurekaserver",
"port": "7001"
}
}
}
docker-compose.yml
version: '3.4'
services:
sampleapi:
image: ${DOCKER_REGISTRY-}sampleapi
ports:
- "7001:80"
networks:
- ecnetwork
build:
context: .
dockerfile: SampleAPI/Dockerfile
gateway:
image: ${DOCKER_REGISTRY-}gateway
ports:
- "7000:80"
networks:
- ecnetwork
build:
context: .
dockerfile: Gateway/Dockerfile
myeurekaserver:
image: ${DOCKER_REGISTRY-}myeurekaserver
ports:
- "8761:8761"
networks:
- ecnetwork
build:
context: .
dockerfile: MyEurekaServer/Dockerfile
networks:
ecnetwork:
external: true
When I run command docker-compose up and check on http://localhost:8761/ I find my services have been registred in the eureka server, but I run http://localhost:7000/sample-api/order
It returns
localhost is currently unable to handle this request. HTTP ERROR 500
I checked my console window, then It is API gateway is able to discover the services, here is the log.
gateway_1 | dbug: Steeltoe.Discovery.Eureka.DiscoveryClient[0]
gateway_1 | FetchRegistryDelta returned: OK
gateway_1 | dbug: Steeltoe.Discovery.Eureka.DiscoveryClient[0]
gateway_1 | FetchRegistry succeeded

Answer 1

It's an application error, check your app API gateway.
500 Internal Server Error
A generic error message, given when an unexpected condition was encountered and no more specific message is suitable
Try to debug your application without Docker.

Answer 2

Check in the docker on which port the service is registered 7000 or 80?
Then see if the 7000 port is accessible for you in local by telnet