MinioClient: java.net.ConnectException: Failed to connect to localhost/127.0.0.1:9000

[dwhitejazz]

I have been looking for an Microservice example that uses docker and kubernetes with minikube.

Working through this example I am stuck trying to run the microservice. The docker containers start up and run for mongodb and knote but the microservice always fails to connect with following exception:

Minio Reconnect: true
java.net.ConnectException: Failed to connect to localhost/127.0.0.1:9000
at okhttp3.internal.connection.RealConnection.connectSocket(RealConnection.java:265)
at okhttp3.internal.connection.RealConnection.connect(RealConnection.java:183)
at okhttp3.internal.connection.ExchangeFinder.findConnection(ExchangeFinder.java:224)
at okhttp3.internal.connection.ExchangeFinder.findHealthyConnection(ExchangeFinder.java:108)
at okhttp3.internal.connection.ExchangeFinder.find(ExchangeFinder.java:88)
at okhttp3.internal.connection.Transmitter.newExchange(Transmitter.java:169)
at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:41)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:142)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:117)
at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:94)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:142)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:117)
at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:142)
at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:88)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:142)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:117)
at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:229)
at okhttp3.RealCall.execute(RealCall.java:81)
at io.minio.MinioClient.executeReq(MinioClient.java:1111)
at io.minio.MinioClient.execute(MinioClient.java:1070)
at io.minio.MinioClient.updateRegionCache(MinioClient.java:1219)
at io.minio.MinioClient.getRegion(MinioClient.java:1264)
at io.minio.MinioClient.executeHead(MinioClient.java:1312)
at io.minio.MinioClient.bucketExists(MinioClient.java:3286)
at io.learnk8s.demo.KNoteController.initMinio(KnoteJavaApplication.java:169)
at io.learnk8s.demo.KNoteController.init(KnoteJavaApplication.java:118)

This is probably a configuration issue on my end but I am unable to determine why this is happening and how to the resolve it. Perhaps related to localhost and a difference between 127.0.0.1 and 0.0.0.0?

My docker image is deployed:
knote-java latest ce9109e6c6df About an hour ago 393MB

Mongodb is running in a docker container:
2020-06-02T01:04:34.139+0000 I NETWORK [listener] Listening on 0.0.0.0
2020-06-02T01:04:34.139+0000 I NETWORK [listener] waiting for connections on port 27017

docker ps looks right too:
docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
c7b4df5e8318 knote-java "/bin/sh -c 'exec ja…" 32 seconds ago Up 30 seconds 0.0.0.0:8080->8080/tcp knote-java
23d5ed2a1fc5 mongo "docker-entrypoint.s…" 2 minutes ago Up 2 minutes 27017/tcp mongo
482ae31f5632 gcr.io/k8s-minikube/kicbase:v0.0.10 "/usr/local/bin/entr…" 6 days ago Up 4 minutes 127.0.0.1:32787->22/tcp, 127.0.0.1:32786->2376/tcp, 127.0.0.1:32785->5000/tcp, 127.0.0.1:32784->8443/tcp minikube

Any assistance is greatly appreciated. Thank you.

[dwhitejazz]

Attempting to use the browser localhost:8080 does not work, but I'm guessing that is because the microservice is not getting past the MinioClient connect operation.

[dwhitejazz]

Please help. Any ideas on why this error is happening?

[salaboy]

@dwhitejazz sorry for the lack of response.. I was not getting notifications for this repo.. now I am..
can you share your kubectl describe pod <POD ID> output? I guess that it might be a missing env variable as it shouldn't point to localhost/127.0.0.1:9000

[lukasz-cpu]

@salaboy
I have the same issue.

[hendisantika]

Where is minio configuration properties?
I didn't see in on the tutorial.

[salaboy]

@hendisantika you mean the application.properties file -> https://github.com/learnk8s/knote-java/blob/master/src/main/resources/application.properties#L1

Or the minio deployment here: https://github.com/learnk8s/knote-java/blob/04-05/kube/minio.yaml#L39 ?

[dcnis]

I have the same issue. Cannot connect to my local docker container running on http://localhost:9000. I always get the same error message "java.net.ConnectException: Failed to connect to localhost/127.0.0.1:9000"

[GetRhymes]

Faced the same problem and found its solution. In my case, I started 2 docker containers: one for the backend and the second for minio. When I specified the parameters for connecting minio, I also specified localhost:9000, but this is wrong! When minio starts, it outputs a log with parameters for connection, it looks something like this:

minio_1 | MinIO Object Storage Server
minio_1 | Copyright: 2015-2022 MinIO, Inc.
minio_1 | License: GNU AGPLv3 https://www.gnu.org/licenses/agpl-3.0.html
minio_1 | Version: RELEASE.2022-10-20T00-55-09Z (go1.19.2 linux/amd64)
minio_1 |
minio_1 | Status: 1 Online, 0 Offline.
minio_1 | API: http://172.18.0.2:9000 http://127.0.0.1:9000
minio_1 | Console: http://172.18.0.2:9001 http://127.0.0.1:9001
minio_1 |
minio_1 | Documentation: https://min.io/docs/minio/linux/index.html

We are interested in 2 lines that I highlighted in bold, of which you should take the first host (http://172.18.0.2:9000 ) and then everything will work for you!

[S-Shreesha]

@GetRhymes, Thanks!!
It works!!