def amazonIDs = ["i-123456","i-345678"]
for ( int i = 0; i < amazonIDs.size; i++ ) {
    println amazonIDs.get(i)
    println "========="
    node(amazonIDs.get(i)) {
        sh "echo 122121"
    }
}

an exception which occurred:
	in field launcher
	in field locals
	in field parent
	in field parent
	in field parent
	in field capture
	in field def
	in field closures
	in object org.jenkinsci.plugins.workflow.cps.CpsThreadGroup@4585ae8d
Caused: java.io.NotSerializableException: hudson.slaves.JNLPLauncher
	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:860)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:967)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:569)
	at org.jboss.marshalling.river.BlockMarshaller.doWriteObject(BlockMarshaller.java:65)
	at org.jboss.marshalling.river.BlockMarshaller.writeObject(BlockMarshaller.java:56)
	at org.jboss.marshalling.MarshallerObjectOutputStream.writeObjectOverride(MarshallerObjectOutputStream.java:50)
	at org.jboss.marshalling.river.RiverObjectOutputStream.writeObjectOverride(RiverObjectOutputStream.java:179)
	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:344)
	at java.util.HashMap.internalWriteEntries(HashMap.java:1785)
	at java.util.HashMap.writeObject(HashMap.java:1362)
	at sun.reflect.GeneratedMethodAccessor21.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.jboss.marshalling.reflect.SerializableClass.callWriteObject(SerializableClass.java:271)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:976)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:967)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:967)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:967)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:967)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:967)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)
	at org.jboss.marshalling.river.BlockMarshaller.doWriteObject(BlockMarshaller.java:65)
	at org.jboss.marshalling.river.BlockMarshaller.writeObject(BlockMarshaller.java:56)
	at org.jboss.marshalling.MarshallerObjectOutputStream.writeObjectOverride(MarshallerObjectOutputStream.java:50)
	at org.jboss.marshalling.river.RiverObjectOutputStream.writeObjectOverride(RiverObjectOutputStream.java:179)
	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:344)
	at java.util.HashMap.internalWriteEntries(HashMap.java:1785)
	at java.util.HashMap.writeObject(HashMap.java:1362)
	at sun.reflect.GeneratedMethodAccessor21.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.jboss.marshalling.reflect.SerializableClass.callWriteObject(SerializableClass.java:271)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:976)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)
	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)
	at org.jboss.marshalling.AbstractObjectOutput.writeObject(AbstractObjectOutput.java:58)
	at org.jboss.marshalling.AbstractMarshaller.writeObject(AbstractMarshaller.java:111)
	at org.jenkinsci.plugins.workflow.support.pickles.serialization.RiverWriter.writeObject(RiverWriter.java:140)
	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.saveProgram(CpsThreadGroup.java:458)
	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.saveProgram(CpsThreadGroup.java:434)
	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.saveProgramIfPossible(CpsThreadGroup.java:422)
	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.run(CpsThreadGroup.java:362)
	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.access$100(CpsThreadGroup.java:82)
	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:242)
	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:230)
	at org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$2.call(CpsVmExecutorService.java:64)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at hudson.remoting.SingleLaneExecutorService$1.run(SingleLaneExecutorService.java:112)
	at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:748)

 lsb_release -a
Description: Ubuntu 16.04.2 LTS
Release: 16.04
Codename: xenial
dpkg -l | grep jenkins
ii jenkins 2.60.2
java -version
java version "1.8.0_131"
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)
/usr/bin/java -jar /var/cache/jenkins/war/WEB-INF/jenkins-cli.jar -s http://127.0.0.1:8080 list-plugins --username=jenkins_admin --password=<PASSWORD>

pipeline-aggregator-view Pipeline Aggregator 1.7
pipeline-graph-analysis Pipeline Graph Analysis Plugin 1.5
pipeline-model-declarative-agent Pipeline: Declarative Agent API 1.1.1
external-monitor-job External Monitor Job Type Plugin 1.7
workflow-api Pipeline: API 2.20
script-security Script Security Plugin 1.33
structs Structs Plugin 1.9 (1.10)
pipeline-maven Pipeline Maven Integration Plugin 3.0.0
docker-workflow Docker Pipeline 1.12
workflow-support Pipeline: Supporting APIs 2.14
groovy-label-assignment Groovy Label Assignment plugin 1.2.0
pipeline-model-api Pipeline: Model API 1.1.9
mercurial Mercurial plugin 2.0 (2.1)
workflow-durable-task-step Pipeline: Nodes and Processes 2.13 (2.14)
pipeline-stage-tags-metadata Pipeline: Stage Tags Metadata 1.1.9
branch-api Branch API Plugin 2.0.11
pipeline-utility-steps Pipeline Utility Steps 1.4.0
ldap LDAP Plugin 1.16
resource-disposer Resource Disposer Plugin 0.6 (0.7)
ldapemail LDAP Email Plugin 0.8
momentjs JavaScript GUI Lib: Moment.js bundle plugin 1.1.1
durable-task Durable Task Plugin 1.14
bitbucket Bitbucket Plugin 1.1.5
pipeline-build-step Pipeline: Build Step 2.5.1
windows-slaves Windows Slaves Plugin 1.3.1
plain-credentials Plain Credentials Plugin 1.4
config-file-provider Config File Provider Plugin 2.16.1 (2.16.3)
build-blocker-plugin Build Blocker Plugin 1.7.3
junit JUnit Plugin 1.20 (1.21)
pipeline-milestone-step Pipeline: Milestone Step 1.3.1
workflow-scm-step Pipeline: SCM Step 2.6
docker-commons Docker Commons Plugin 1.8
pipeline-stage-step Pipeline: Stage Step 2.2
role-strategy Role-based Authorization Strategy 2.5.1
credentials-binding Credentials Binding Plugin 1.12 (1.13)
ansicolor AnsiColor 0.5.0 (0.5.2)
pipeline-stage-view Pipeline: Stage View Plugin 2.8
pipeline-model-definition Pipeline: Model Definition 1.1.9
timestamper Timestamper 1.8.8
pipeline-input-step Pipeline: Input Step 2.7 (2.8)
groovy-events-listener-plugin Groovy Events Listener Plugin 1.014
matrix-auth Matrix Authorization Strategy Plugin 1.7
ssh-credentials SSH Credentials Plugin 1.13
git Git plugin 3.5.0 (3.5.1)
build-name-setter build-name-setter 1.6.7
jquery-detached JavaScript GUI Lib: jQuery bundles (jQuery and jQuery UI) plugin 1.2.1
workflow-job Pipeline: Job 2.12.1 (2.12.2)
jobConfigHistory Job Configuration History Plugin 2.16 (2.17)
pipeline-rest-api Pipeline: REST API Plugin 2.8
ace-editor JavaScript GUI Lib: ACE Editor bundle plugin 1.1
javadoc Javadoc Plugin 1.4
display-url-api Display URL API 2.0
authentication-tokens Authentication Tokens API Plugin 1.3
ws-cleanup Workspace Cleanup Plugin 0.34
icon-shim Icon Shim Plugin 2.0.3
mailer Mailer Plugin 1.20
dashboard-view Dashboard View 2.9.11
pam-auth PAM Authentication plugin 1.3
bouncycastle-api bouncycastle API Plugin 2.16.2
git-server GIT server Plugin 1.7
nexus-artifact-uploader Nexus Artifact Uploader 2.9 (2.10)
extended-read-permission Extended Read Permission Plugin 2.0
gitlab-plugin GitLab Plugin 1.4.7
groovy-postbuild Groovy Postbuild 2.3.1
workflow-cps-global-lib Pipeline: Shared Groovy Libraries 2.8
ant Ant Plugin 1.5 (1.7)
workflow-aggregator Pipeline 2.5
workflow-step-api Pipeline: Step API 2.12
maven-plugin Maven Integration plugin 2.17
scm-api SCM API Plugin 2.2.0 (2.2.1)
global-post-script Global Post Script Plugin 1.1.3
matrix-project Matrix Project Plugin 1.11
credentials Credentials Plugin 2.1.14
handlebars JavaScript GUI Lib: Handlebars bundle plugin 1.1.1
statistics-gatherer Statistics Gatherer Plugin 1.1.2
cloudbees-folder Folders Plugin 6.1.0 (6.1.2)
pipeline-model-extensions Pipeline: Declarative Extension Points API 1.1.9
workflow-basic-steps Pipeline: Basic Steps 2.6
workflow-multibranch Pipeline: Multibranch 2.16
token-macro Token Macro Plugin 2.1 (2.2)
groovy Groovy 2.0
workflow-cps Pipeline: Groovy 2.39
git-client Git client plugin 2.5.0
antisamy-markup-formatter OWASP Markup Formatter Plugin 1.5