Jenkins withDockerRegistry的映像出现阶段性故障

Question

我在一个阶段构建映像时遇到问题，并且尝试在另一阶段推送到注册表：

此代码可以正常工作：

    stage('Push Image to registry') {
      steps{
        script{
          withDockerRegistry(credentialsId: 'gcr:xxxx', url: 'http://eu.gcr.io/xxxxx/') {
            def dockerImageNginx = docker.build registrynginx + ":$BUILD_NUMBER", "-f dockerfilenginx ." 
            dockerImageNginx.push()
          }
        }
      }

但是，当我尝试在一个阶段中构建映像，然后在另一个阶段中进行推送时，如下所示：（这是因为我使用Image来运行多个测试，并且当测试通过时，我会推送图像，而不是之前）

    stage('Building image NGINX') {
      steps{
        script {
          def dockerImageNginx = docker.build registrynginx + ":$BUILD_NUMBER", "-f dockerfilenginx ."  
        }
      }
    }
    stage('Push Image to registry') {
      steps{
        script{
          withDockerRegistry(credentialsId: 'gcr:xxxxx', url: 'http://eu.gcr.io/xxxx/') {
            dockerImageNginx.push()
          }
        }
      }
    }

这给我这个错误。

groovy.lang.MissingPropertyException: No such property: dockerImageNginx for class: groovy.lang.Binding
    at groovy.lang.Binding.getVariable(Binding.java:63)
    at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SandboxInterceptor.onGetProperty(SandboxInterceptor.java:270)
    at org.kohsuke.groovy.sandbox.impl.Checker$6.call(Checker.java:291)
    at org.kohsuke.groovy.sandbox.impl.Checker.checkedGetProperty(Checker.java:295)
    at org.kohsuke.groovy.sandbox.impl.Checker.checkedGetProperty(Checker.java:271)
    at org.kohsuke.groovy.sandbox.impl.Checker.checkedGetProperty(Checker.java:271)
    at org.kohsuke.groovy.sandbox.impl.Checker.checkedGetProperty(Checker.java:271)
    at org.kohsuke.groovy.sandbox.impl.Checker.checkedGetProperty(Checker.java:271)
    at com.cloudbees.groovy.cps.sandbox.SandboxInvoker.getProperty(SandboxInvoker.java:29)
    at com.cloudbees.groovy.cps.impl.PropertyAccessBlock.rawGet(PropertyAccessBlock.java:20)
    at WorkflowScript.run(WorkflowScript:61)
    at ___cps.transform___(Native Method)
    at com.cloudbees.groovy.cps.impl.PropertyishBlock$ContinuationImpl.get(PropertyishBlock.java:74)
    at com.cloudbees.groovy.cps.LValueBlock$GetAdapter.receive(LValueBlock.java:30)
    at com.cloudbees.groovy.cps.impl.PropertyishBlock$ContinuationImpl.fixName(PropertyishBlock.java:66)
    at sun.reflect.GeneratedMethodAccessor832.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java:72)
    at com.cloudbees.groovy.cps.impl.ConstantBlock.eval(ConstantBlock.java:21)
    at com.cloudbees.groovy.cps.Next.step(Next.java:83)
    at com.cloudbees.groovy.cps.Continuable$1.call(Continuable.java:174)
    at com.cloudbees.groovy.cps.Continuable$1.call(Continuable.java:163)
    at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.use(GroovyCategorySupport.java:129)
    at org.codehaus.groovy.runtime.GroovyCategorySupport.use(GroovyCategorySupport.java:268)
    at com.cloudbees.groovy.cps.Continuable.run0(Continuable.java:163)
    at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.access$001(SandboxContinuable.java:18)
    at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.run0(SandboxContinuable.java:51)
    at org.jenkinsci.plugins.workflow.cps.CpsThread.runNextChunk(CpsThread.java:186)
    at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.run(CpsThreadGroup.java:370)
    at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.access$200(CpsThreadGroup.java:93)
    at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:282)
    at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:270)
    at org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$2.call(CpsVmExecutorService.java:67)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at hudson.remoting.SingleLaneExecutorService$1.run(SingleLaneExecutorService.java:131)
    at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
    at jenkins.security.ImpersonatingExecutorService$1.run(ImpersonatingExecutorService.java:59)
    at java.util.concurrent.Executors$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)

如何解决此错误？也许这是var dockerimagenginx不全局的问题？另外，我可以使用docker push命令来推送图像，但是我认为这更干净。

Answer 1

为了使变量成为全局变量，可以在pipeline之外的Jenkinsfile顶部定义它：

def dockerImageNginx
pipeline {
...
stage('Building image NGINX') {
  steps{
    script {
      dockerImageNginx = docker.build registrynginx + ":$BUILD_NUMBER", "-f dockerfilenginx ."  
    }
  }
}
stage('Push Image to registry') {
  steps{
    script{
      withDockerRegistry(credentialsId: 'gcr:xxxxx', url: 'http://eu.gcr.io/xxxx/') {
        dockerImageNginx.push()
      }
    }
  }
}