Jenkins SSH Steps invalid privatekey

I'm trying to run a ssh deployment using jenkins and the SSH Pipeline Steps plugin. I've created a ssh key using openssh on MacOS.

ssh-keygen -m PEM

Then I copied the key to remote server using ssh-copy-id. The login with my command line works well. In Jenkins I created a new secret.

My pipeline step looks like this

stage("Deploy to docker host") { steps { script { withCredentials([sshUserPrivateKey( credentialsId: "docker-jenkins", keyFileVariable: 'sshKey', usernameVariable: 'sshUser' )]) { def remote = [:]; remote.name = 'docker-host'; remote.host = '127.0.0.1'; remote.user = sshUser; remote.identity = sshKey; remote.allowAnyHosts = true; sshCommand remote: remote, command: "ls -lrt" } } }
}

When I run the pipeline I get the following output.

Executing command on 01-de.docker[127.0.0.1]: ls -lrt sudo: false
com.jcraft.jsch.JSchException: invalid privatekey: [B@4ba138bd at com.jcraft.jsch.KeyPair.load(KeyPair.java:747) at com.jcraft.jsch.IdentityFile.newInstance(IdentityFile.java:46) at com.jcraft.jsch.JSch.addIdentity(JSch.java:441) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite$PojoCachedMethodSite.invoke(PojoMetaMethodSite.java:192) at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite.call(PojoMetaMethodSite.java:56) at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:149) at org.hidetake.groovy.ssh.connection.UserAuthentication$Trait$Helper.configureUserAuthentication(UserAuthentication.groovy:39) at org.hidetake.groovy.ssh.connection.UserAuthentication$Trait$Helper$configureUserAuthentication$0.call(Unknown Source) at org.hidetake.groovy.ssh.connection.ConnectionManager.configureUserAuthentication(ConnectionManager.groovy) at org.hidetake.groovy.ssh.connection.UserAuthentication$configureUserAuthentication$0.callCurrent(Unknown Source) at org.hidetake.groovy.ssh.connection.ConnectionManager.connectInternal(ConnectionManager.groovy:104) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93) at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325) at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:384) at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1022) at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.callCurrent(PogoMetaClassSite.java:69) at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:190) at org.hidetake.groovy.ssh.connection.ConnectionManager$_connectInternal_closure1.doCall(ConnectionManager.groovy:85) at org.hidetake.groovy.ssh.connection.ConnectionManager$_connectInternal_closure1.doCall(ConnectionManager.groovy) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93) at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325) at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294) at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1022) at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:42) at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:117) at org.hidetake.groovy.ssh.util.Utility.retry(Utility.groovy:52) at org.hidetake.groovy.ssh.util.Utility$retry.callStatic(Unknown Source) at org.hidetake.groovy.ssh.connection.ConnectionManager.connectInternal(ConnectionManager.groovy:83) at org.hidetake.groovy.ssh.connection.ConnectionManager.connectInternal(ConnectionManager.groovy) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite$PogoCachedMethodSiteNoUnwrapNoCoerce.invoke(PogoMetaMethodSite.java:210) at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite.callCurrent(PogoMetaMethodSite.java:59) at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:166) at org.hidetake.groovy.ssh.connection.ConnectionManager.connect(ConnectionManager.groovy:59) at org.hidetake.groovy.ssh.connection.ConnectionManager$connect.call(Unknown Source) at org.hidetake.groovy.ssh.session.SessionTask.wetRun(SessionTask.groovy:61) at org.hidetake.groovy.ssh.session.SessionTask.call(SessionTask.groovy:48) at java_util_concurrent_Callable$call$0.call(Unknown Source) at org.hidetake.groovy.ssh.core.Service.run(Service.groovy:81) at org.hidetake.groovy.ssh.core.Service$run$0.call(Unknown Source) at org.jenkinsci.plugins.sshsteps.SSHService.executeCommand(SSHService.groovy:177) at org.jenkinsci.plugins.sshsteps.steps.CommandStep$Execution$CommandCallable.execute(CommandStep.java:84) at org.jenkinsci.plugins.sshsteps.util.SSHMasterToSlaveCallable.call(SSHMasterToSlaveCallable.java:32) at hudson.remoting.LocalChannel.call(LocalChannel.java:45) at org.jenkinsci.plugins.sshsteps.steps.CommandStep$Execution.run(CommandStep.java:72) at org.jenkinsci.plugins.sshsteps.util.SSHStepExecution.lambda$start$0(SSHStepExecution.java:84) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748)

I've already read this post where the issue was caused by an unsupported key format. But I'm already using the older format with the -PEM flag on key creation.

What is wrong with this pipeline?

1 Answer

Try to replace

identity

with:

identifyFile