Sunshine (Saranya),
We use a simple Groovy (Scriptler) script setup to run as a Job on the Jenkins
Master every 15 minutes, that checks to see if Jenkins Nodes/Slaves respond or
it can get an environment setting from them, and if not, sends an email to us
alerting that the Node/Slave is disconnected or down.
Id: monitor.slave.nodes.groovy
Name: Monitor Slave Nodes
Comment: Monitors Jenkins Nodes and sends out email if it finds a
node down.
Permission: X
Restriction: X (only run on Master)
No Parameters
----------------------Script Start--------------------
/*** BEGIN META {
"name" : "Monitor Slave Nodes",
"comment" : "Monitors Jenkins Nodes and sends out email if it finds a node
down.",
} END META**/
import hudson.model.*
import hudson.node_monitors.*
import hudson.slaves.*
import java.util.concurrent.*
jenkins = Hudson.instance
import javax.mail.internet.*;
import javax.mail.*
import javax.activation.*
import jenkins.model.JenkinsLocationConfiguration
//SendMail process to send emails for notification purposes.
def sendMail (slave, cause) {
jlc = new jenkins.model.JenkinsLocationConfiguration()
message = slave + " slave is down. Check " + jlc.getUrl() + "/computer/" +
slave + "\nBecause " + cause
subject = slave + " slave is offline"
//The Email Address(es) you want Notifications Sent to, separated by
semi-colons(;). We usually put an Email Distribution List here, example –
[email protected]
toAddress = "[email protected]"
fromAddress = jlc.getAdminAddress()
//Your SMTP Server Fully Qualified Domain Name, example – smtp.yahoo.com
host = "SMTPServerFQDN"
//Port number to use for SMTP Server
port = "25"
//Set properties to support the email process
Properties mprops = new Properties();
mprops.setProperty("mail.transport.protocol","smtp");
mprops.setProperty("mail.host",host);
mprops.setProperty("mail.smtp.port",port);
Session lSession = Session.getDefaultInstance(mprops,null);
MimeMessage msg = new MimeMessage(lSession);
//tokenize out the recipients in case they came in as a list
StringTokenizer tok = new StringTokenizer(toAddress,";");
ArrayList emailTos = new ArrayList();
while(tok.hasMoreElements()){
emailTos.add(new InternetAddress(tok.nextElement().toString()));
}
InternetAddress[] to = new InternetAddress[emailTos.size()];
to = (InternetAddress[]) emailTos.toArray(to);
msg.setRecipients(MimeMessage.RecipientType.TO,to);
InternetAddress fromAddr = new InternetAddress(fromAddress);
msg.setFrom(fromAddr);
msg.setFrom(new InternetAddress(fromAddress));
msg.setSubject(subject);
msg.setText(message)
Transport transporter = lSession.getTransport("smtp");
transporter.connect();
transporter.send(msg);
}
//Get Environment process for getting each Jenkins Node
def getEnviron(computer) {
def env
def thread = Thread.start("Getting env from ${computer.name}", { env =
computer.environment })
thread.join(2000)
if (thread.isAlive()) thread.interrupt()
env
}
//Check to see if the Jenkins Node is accessible (try to get the PATH setting
from the Node)
def slaveAccessible(computer) {
getEnviron(computer)?.get('PATH') != null
}
def numberOfflineNodes = 0
def numberNodes = 0
for (slave in jenkins.slaves) {
def computer = slave.computer
numberNodes ++
println ""
println "Checking computer ${computer.name}:"
//Can you get the PATH and the Node is not OffLine
def isOK = (slaveAccessible(computer) && !computer.offline)
//If it responds, it is OK, so just print some info about it
if (isOK) {
println "\t\tOK, got PATH back from slave ${computer.name}."
println('\tcomputer.isOffline: ' + slave.getComputer().isOffline());
println('\tcomputer.isTemporarilyOffline: ' +
slave.getComputer().isTemporarilyOffline());
println('\tcomputer.getOfflineCause: ' +
slave.getComputer().getOfflineCause());
println('\tcomputer.offline: ' + computer.offline);
} else {
//The Node doesn’t respond or is set OffLine
numberOfflineNodes ++
println " ERROR: can't get PATH from slave ${computer.name}."
println('\tcomputer.isOffline: ' + slave.getComputer().isOffline());
println('\tcomputer.isTemporarilyOffline: ' +
slave.getComputer().isTemporarilyOffline());
println('\tcomputer.getOfflineCause: ' +
slave.getComputer().getOfflineCause());
println('\tcomputer.offline: ' + computer.offline);
if
((slave.getComputer().getOfflineCause().toString().contains("Disconnected by"))
| (computer.name.contains("SetANodeNameHereifYouWantToIgnoreItSpecifically"))) {
//The Node was purposely taken OffLine (disconnected) or is explicitly
set to be ignored, don’t send anything out
} else {
//Send out an email notification for each Node that is OffLine/Down
sendMail(computer.name, slave.getComputer().getOfflineCause().toString())
}
if (slave.getComputer().isTemporarilyOffline()) {
if
(!slave.getComputer().getOfflineCause().toString().contains("Disconnected by"))
{
computer.setTemporarilyOffline(false,
slave.getComputer().getOfflineCause())
}
} else {
computer.connect(true)
}
}
}
println ("Number of Offline Nodes: " + numberOfflineNodes)
println ("Number of Nodes: " + numberNodes)
----------------------Script End--------------------
I hope this helps.
Thanks,
John
---------------
John Burrows
From: [email protected] [mailto:[email protected]] On Behalf Of Baptiste Mathus
Sent: Tuesday, April 17, 2018 5:26 AM
To: [email protected]
Subject: Re: Alert if master gets disconnected or if any shared slave goes
offline.
Hello,
This question is specific to CloudBees products. Please open a ticket on the
usual commercial support https://support.cloudbees.com/hc/en-us/requests/new
Thanks
2018-04-17 11:02 GMT+02:00 Sunshine
<[email protected]<mailto:[email protected]>>:
Hi all ,
Is there a way via groovy scipt to check if a master gets disconnected from the
JOC ?
Also ,
To check for any offline shared slave that's connected at JOC level ,
I used com.cloudbees.opscenter.server.model.Sharedslaves to display offline
slaves ,
But it doesn't seem to work.
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