fetch port number of the running container and port on the host

declarative-examples/simple-examples/dockercontainerPort.groovy

@@ -0,0 +1,49 @@
+pipeline {
+    environment {
+        IMAGE = "docker-repository/custom-tutum"
+    }
+
+    // build agent where docker commands can be run
+    agent 'docker-node'
+
+    stages {
+        stage('build') {
+            steps {
+                script {
+                    // Dockerfile should be stored at the dir level same as that of Jenkinsfile
+                    // Contents of Dockerfile,
+                    /*
+                        FROM tutum/hello-world
+                        EXPOSE 80
+                    */
+                    image = docker.build("${IMAGE}")
+                    println "Newly generated image, " + image.id
+                }
+            }
+        }
+        stage('test') {
+            steps {
+                script {
+                    // https://hub.docker.com/r/tutum/hello-world/
+                    // build agent should have 'curl' installed.
+                    def container = image.run('-p 80')
+                    def contport = container.port(80)
+                    def resp = sh(returnStdout: true,
+                                        script: """
+                                                set -x
+                                                curl -w "%{http_code}" -o /dev/null -s \
+                                                http://\"${contport}\"
+                                                """
+                                        ).trim()
+                    if ( resp == "200" ) {
+                        println "tutum hello world app is alive and kicking!"
+                        currentBuild.result = "SUCCESS"
+                    } else {
+                        println "tutum hello world app isn't reachable!!!"
+                        currentBuild.result = "FAILURE"
+                    }
+                }
+            }
+        }
+    }
+}