I am trying to implement a SideCar pattern in OpenShift. My example has two Project API's. I am running the two Projects in different containers and in a single pod. Below is my deployment config specifying 2 images.
containers:
- env:
- name: ASPNETCORE_URLS
value: 'http://*:8080'
image: 'docker-registry.default.svc:5000/it-mfg/hello-api-n:4.0'
imagePullPolicy: Always
name: hello-api-n
ports:
- containerPort: 8080
name: http
protocol: TCP
resources: {}
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
- env:
- name: ASPNETCORE_URLS
value: 'http://*:8090'
image: 'docker-registry.default.svc:5000/it-mfg/hello-sidecar-api-n:4.0'
imagePullPolicy: Always
name: hello-sidecar-api-n
ports:
- containerPort: 8090
name: http
protocol: TCP
resources: {}
I want to hit the api from one container to api in another container through localhost. When I go to the Pod Terminal and select hello-api-n container and do http://localhost:8080/FromSidecar, the communication is not happenning.
Actually when I hit /FromSidecar the internal code implementaion makes a API call to localhost:8090/hello which is a different container.
Below is the error I am facing
I have no name!@hello-api-n-deployment-config-3-xvlsd:/app$ curl -v http://localhost:8080/FromSidecar
* Uses proxy env variable no_proxy == 'localhost'
* Trying ::1:8080...
* TCP_NODELAY set
* Connected to localhost (::1) port 8080 (#0)
> GET /FromSidecar HTTP/1.1
> Host: localhost:8080
> User-Agent: curl/7.68.0
> Accept: */*
>
* Mark bundle as not supporting multiuse
< HTTP/1.1 404 Not Found
< Date: Wed, 05 May 2021 09:00:22 GMT
< Server: Kestrel
< Content-Length: 0
<
* Connection #0 to host localhost left intact
I have no name!@hello-api-n-deployment-config-3-xvlsd:/app$
The example I am trying to do is from below https://github.com/cesaroll/dotnet-sidecar
UPDATED CODE:
Project A Container code:
[HttpGet]
[Route("FromSidecar")]
public async Task<IActionResult> GetFromSidecar()
{
return Ok(await _helloService.RetrieveHelloMessage());
}
HelloService:
public async Task<HelloMessage> RetrieveHelloMessage()
{
//string sidecarUrl = configuration.GetSection("SideCar").GetSection("SideCarUrl").Value;
**string URL = "http://localhost:8090/Hello" /// hitting Container B**
var client = new HttpClient();
var response = client.GetAsync(URL).Result;
if (!response.IsSuccessStatusCode)
{
return new HelloMessage()
{
Message = $"Error Status Code: {response.StatusCode}, Reason: {response.ReasonPhrase}"
};
}
_logger.LogInformation(response.Content.ReadAsStringAsync().Result);
var helloMessage = await response.Content.ReadFromJsonAsync<HelloMessage>();
_logger.LogInformation(helloMessage?.Message);
return helloMessage;
}
PROJECT B Container code:
public IActionResult Get()
{
return Ok(new {Message = "Hello from Sidecar Api"});
}
The communication is working fine, as you can see the response HTTP/1.1 404 Not Found
from the container.
The error 404
means the resource you are looking is not there. The connection is established Connected to localhost