Access kubernetes docker for desktop from jenkins - docker

Question

I've already installed a kubernetes docker for desktop and it's working fine. Then, I installed and configured a jenkins container.
Now, I want to deploy from jenkins container to kubernetes.
I installed Kubernetes Continuous Deploy Plugin and I configured the credential using the result of "kubectl config view" command
apiVersion: v1
clusters:
- cluster:
insecure-skip-tls-verify: true
server: https://localhost:6445
name: docker-for-desktop-cluster
contexts:
- context:
cluster: docker-for-desktop-cluster
user: docker-for-desktop
name: docker-for-desktop
current-context: docker-for-desktop
kind: Config
preferences: {}
When I try to deploy to kubernetes from jenkins, I get this error
ERROR: ERROR: io.fabric8.kubernetes.client.KubernetesClientException: Operation: [get] for kind: [Deployment] with name: [sudoku] in namespace: [default] failed.
hudson.remoting.ProxyException: io.fabric8.kubernetes.client.KubernetesClientException: Operation: [get] for kind: [Deployment] with name: [sudoku] in namespace: [default] failed.
at io.fabric8.kubernetes.client.KubernetesClientException.launderThrowable(KubernetesClientException.java:62)
at io.fabric8.kubernetes.client.KubernetesClientException.launderThrowable(KubernetesClientException.java:71)
at io.fabric8.kubernetes.client.dsl.base.BaseOperation.getMandatory(BaseOperation.java:206)
at io.fabric8.kubernetes.client.dsl.base.BaseOperation.get(BaseOperation.java:162)
at com.microsoft.jenkins.kubernetes.KubernetesClientWrapper$DeploymentUpdater.getCurrentResource(KubernetesClientWrapper.java:404)
at com.microsoft.jenkins.kubernetes.KubernetesClientWrapper$DeploymentUpdater.getCurrentResource(KubernetesClientWrapper.java:392)
at com.microsoft.jenkins.kubernetes.KubernetesClientWrapper$ResourceUpdater.createOrApply(KubernetesClientWrapper.java:358)
at com.microsoft.jenkins.kubernetes.KubernetesClientWrapper.apply(KubernetesClientWrapper.java:157)
at com.microsoft.jenkins.kubernetes.command.DeploymentCommand$DeploymentTask.doCall(DeploymentCommand.java:168)
at com.microsoft.jenkins.kubernetes.command.DeploymentCommand$DeploymentTask.call(DeploymentCommand.java:122)
at com.microsoft.jenkins.kubernetes.command.DeploymentCommand$DeploymentTask.call(DeploymentCommand.java:105)
at hudson.FilePath.act(FilePath.java:1165)
at com.microsoft.jenkins.kubernetes.command.DeploymentCommand.execute(DeploymentCommand.java:67)
at com.microsoft.jenkins.kubernetes.command.DeploymentCommand.execute(DeploymentCommand.java:46)
at com.microsoft.jenkins.azurecommons.command.CommandService.runCommand(CommandService.java:88)
at com.microsoft.jenkins.azurecommons.command.CommandService.execute(CommandService.java:96)
at com.microsoft.jenkins.azurecommons.command.CommandService.executeCommands(CommandService.java:75)
at com.microsoft.jenkins.azurecommons.command.BaseCommandContext.executeCommands(BaseCommandContext.java:77)
at com.microsoft.jenkins.kubernetes.KubernetesDeploy.perform(KubernetesDeploy.java:42)
at hudson.tasks.BuildStepCompatibilityLayer.perform(BuildStepCompatibilityLayer.java:81)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:744)
at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.build(MavenModuleSetBuild.java:945)
at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.doRun(MavenModuleSetBuild.java:896)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:504)
at hudson.model.Run.execute(Run.java:1810)
at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:543)
at hudson.model.ResourceController.execute(ResourceController.java:97)
at hudson.model.Executor.run(Executor.java:429)
Caused by: hudson.remoting.ProxyException: java.net.ConnectException: Failed to connect to /localhost:6445
at okhttp3.internal.connection.RealConnection.connectSocket(RealConnection.java:240)
at okhttp3.internal.connection.RealConnection.connect(RealConnection.java:158)
at okhttp3.internal.connection.StreamAllocation.findConnection(StreamAllocation.java:256)
at okhttp3.internal.connection.StreamAllocation.findHealthyConnection(StreamAllocation.java:134)
at okhttp3.internal.connection.StreamAllocation.newStream(StreamAllocation.java:113)
at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:42)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:93)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:125)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at io.fabric8.kubernetes.client.utils.ImpersonatorInterceptor.intercept(ImpersonatorInterceptor.java:54)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at io.fabric8.kubernetes.client.utils.HttpClientUtils$2.intercept(HttpClientUtils.java:95)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:200)
at okhttp3.RealCall.execute(RealCall.java:77)
at io.fabric8.kubernetes.client.dsl.base.OperationSupport.handleResponse(OperationSupport.java:379)
at io.fabric8.kubernetes.client.dsl.base.OperationSupport.handleResponse(OperationSupport.java:344)
at io.fabric8.kubernetes.client.dsl.base.OperationSupport.handleGet(OperationSupport.java:313)
at io.fabric8.kubernetes.client.dsl.base.OperationSupport.handleGet(OperationSupport.java:296)
at io.fabric8.kubernetes.client.dsl.base.BaseOperation.handleGet(BaseOperation.java:770)
at io.fabric8.kubernetes.client.dsl.base.BaseOperation.getMandatory(BaseOperation.java:195)
... 26 more
Caused by: hudson.remoting.ProxyException: java.net.ConnectException: Connection refused (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at okhttp3.internal.platform.Platform.connectSocket(Platform.java:125)
at okhttp3.internal.connection.RealConnection.connectSocket(RealConnection.java:238)
... 55 more
Obviusly the error is the address of kubernetes but I don't know how to retrieve the correct one.
I tried the one I can see in kubernetes under the Service > Kubernetes > Deploy but it doen't work. Where can I find the correct one?

Answer 1

Your problem lays in kubeconfig file, to be precise in following section:
server: https://localhost:6445
It`s of course valid in context of your local machine, but not when you are trying to use it to reach Kubernetes cluster from inside of node/agent jenkins container. Containers are having unique hostname, so talking from container to https://localhost address is like talking to itself.
Solution:
please replace 'localhost' with either 'host.docker.internal', 'docker.for.win.localhost' (if you are on Windows) or simply local IP address of your local machine, like this:
apiVersion: v1
clusters:
- cluster:
insecure-skip-tls-verify: true
server: https://docker.for.win.localhost:6445
name: docker-for-desktop-cluster
contexts:
- context:
cluster: docker-for-desktop-cluster
user: docker-for-desktop
name: docker-for-desktop
current-context: docker-for-desktop
...
You can read more on Docker Desktop networking here