How to check jenkins node connection status using jenkins-cli - jenkins

Question

I'm trying to check specific Jenkins node is connected using Jenkins CLI
. To get the node details I can use get-node command and it returns details as this xml
<?xml version="1.0" encoding="UTF-8"?>
<slave>
<name>20170602_jenkins_slave_002</name>
<description>10.49.82.46</description>
<remoteFS>c:\\jenkins_root</remoteFS>
<numExecutors>1</numExecutors>
<mode>EXCLUSIVE</mode>
<retentionStrategy class="hudson.slaves.RetentionStrategy$Always"/>
<launcher class="hudson.slaves.JNLPLauncher"/>
<label>20170602_jenkins_slave_002</label>
<nodeProperties/>
<userId>admin</userId>
</slave>
But it does not includes the node status. Anyone has idea how to check the node status by Jenkins cli

Answer 1

As I'm not aware of a method using jenkins-cli, my suggestion is to use the REST API:
http://jenkins.example.com/computer/:name/api/json
returns JSON data including an offline field.
You can get an overview over all agents (called computer here) on the following URL:
http://jenkins.example.com/computer/api/json?pretty=true

Answer 2

We can implement this using pipeline. I did using the groovy script for the windows VDI machines, Below is the script.
pipeline {
agent none
stages {
stage('Agent Health check step') {
options {
timeout(time:5, unit: 'MINUTES')
}
agent {
label "master"
}
steps {
script {
def agStatusList = []
def agentsMap = [VDI1:"XYZ#gmail.com", VDI2:"XYZ2#gmail.com", VDI3:"XYZ#gmail.com", VDI4:"himesh.patel#gmail.com"]
String agEmlTo=''
for (agSlave in hudson.model.Hudson.instance.slaves) {
def agName=agSlave.name
def agOwner=agentsMap.get(agName)
def agStatus=agSlave.getComputer().isOnline()
if (agStatus != true ){
echo "Node is offline"
echo " "
agStatusList += agName + " node is offline" + " and owner is " + agOwner
if(agStatus != true && agOwner != null){
if (agEmlTo == null || agEmlTo.trim().isEmpty()){
agEmlTo = agOwner
} else{
agEmlTo += (','+agOwner)
}
}
}else{
echo "Node is online"
echo " "
agStatusList += agName + " node is online" + " and owner is " + agOwner
}
}
println agStatusList
println agEmlTo
if (agEmlTo != null && !agEmlTo.trim().isEmpty()) {
echo "Sending email to the owners of offline Nodes"
string agEmlCc='123#gmail.com'
string agEmlFrom='JenkinsServer#gmail.com'
String agEmlHdr='[Notification] Your Windows VDI agent is offline'
String agEmlBody='Hello, \n \nThe Windlows VDI agent assigned to you seems offline now. Please check the Windows VDI machine and get it connected ASAP.\n \n *This E-mail is from Automated process. Please do not respond directly to this e-mail as the originating e-mail account is not monitored*'
emailext body: "${agEmlBody}",
to: "${agEmlTo}",
subject: "${agEmlHdr}"
from: "JenkinsServer#gmail.com"
}
}
}
}
}
}