Matlab microservice in Docker Compose

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bluhub
bluhub 2024-4-17
回答： Harsh 2024-8-30
I created a microservice in MATLAB according to following how-to and it works as expected: https://de.mathworks.com/help/compiler_sdk/mps_dev_test/create-a-microservice-docker-image.html
I built a web-app, which shall use that ML-container and retrieves data from it. When I run both containers independently, communication works as expected.
I now had the plan to put them into a docker-compose and start-up my application via compose. This is the compose-file, that I currently use:
services:
web:
image: web_app:latest
ports:
- "5000:5000"
environment:
- MLSL_URI=http://mlsl:9910
mlsl:
image: mlsl_server:latest
ports:
- "9900:9910"
container_name: mlsl
I now face following issue:
  • web-container cannot access the ML-container's necessary service via the internal port - I receive HTTP404
  • I use following endpoint for that http://mlsl:9910/functionarchive/convertData
I tried following things:
  • I checked the external endpoint of the container via http://mlsl:9900/api/health and received HTTP200
  • the service of the ML-container is still accessible and I receive data via the external port
  • via http://mlsl:9900/functionarchive/convertData
  • I checked the internal endpoint of the internal network of the container via http://mlsl:9910/api/health and receive a HTTP403, indicating permission issues
So I am quite stuck. Is there any way to access the services inside the docker network or is it just possible to access the public docker port of the ML-container? Do I need to change the container build settings in ML/SL? I used the settings as mentioned in the how-to of ML/SL.

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回答（1 个）

Harsh
Harsh 2024-8-30
Hi,
From what I can gather, you are trying to run 2 MATLAB docker images simultaneously using docker-compose and call 1 image from another.
Here's a guide on how MATLAB Docker images can interact when deployed with Docker Compose:
  • In this example, two functions have been created: thisAdds and makeCalls:
function c = thisadds(a, b)
c = a + b;
end
When specifying the connection, instead of using "localhost," the local IP address is used. This IP can be found using various methods, such as executing ifconfig (requires net-tools) on the WSL.
  • These functions can be compiled using the “compiler.build.productionServerArchive” command.
(For thisadds.m)
thisAddsObj = compiler.build.productionServerArchive('thisadds.m',...
'FunctionSignatures','thisaddsFunctionSignatures.json',...
'ArchiveName','thisaddsarchive','Verbose','on')
(For makecall.m)
makecallObj = compiler.build.productionServerArchive('makecall.m',...
'FunctionSignatures','makecallFunctionSignatures.json',...
'ArchiveName','makecallarchive','Verbose','on')
Additionally, a function signature has been created for makeCalls. More information about function signatures can be found at the following link:
https://www.mathworks.com/help/compiler_sdk/mps_restfuljson/matlab-function-signatures-in-json.html
  • The Docker images are created using the “compiler.package.microserviceDockerImage” function.
(To create thisadds docker image)
compiler.package.microserviceDockerImage(thisAddsObj,'ImageName','thisadds')
(To create makecall docker image)
compiler.package.microserviceDockerImage(makecallObj,'ImageName','makecall')
  • Next, access the WSL to verify the creation of Docker images. The names of the images should be listed:
docker images
  • Create a docker-compose.yml file to configure the setup.
Note: To change the endpoint from 9910, modifications in the MATLAB image are necessary; simply changing the port mapping from 5000:5000 will not suffice without adjustments.
  • Run Docker Compose to start the services:
docker-compose up
  • Finally, call the makeCalls Docker image to test the setup:
Voila, it works!!

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