"Soft" stopping of slaves

[Steffen Breitbach]

Hi everyone!

I'd like to prevent our slaves from processing tasks in a given
timeframe to have system ressources free for other tasks (e.g. backup
tasks).

I don't want to shutdown the slaves, I'd rather make them stop
processing jobs and then enable them some time later, much like the
"safe shutdown" for Jenkins itself does.

I thought I might have seen a plug-in that could do the job but I don't
seem to be able to find it any more.

A groovy script might do the job as well, but I couldn't find an example
anywhere.

Do you have any ideas how I might do this?!

Thanks in advance

Steffen

[Mandeville, Rob]

I have a similar problem, where I need to run maintenance jobs on machines with multiple nodes. I installed the Scriptler plugin and wrote these two scripts; one to disable all nodes on a given label (which lets them finish their current tasks but prevents them from taking on more jobs) and wait for them to finish (you may not need the last part), and the other to enable all nodes on that label. These scripts must be run as Scriptler jobs that are bound to the master node (so that they are in the same address space as the server).

--Rob Mandeville

---BEGIN LABEL SHUTDOWN SCRIPT---
import hudson.model.Hudson
import jenkins.model.Jenkins
import hudson.model.Computer

println "Passed in label $labelName."

label = Jenkins.instance.getLabel(labelName)
if(!label){
println("Could not find label $labelName")
}else{
nodes = label.getNodes()
for(node in nodes){
nodeName = node.getNodeName()
println("Node $nodeName is part of label $labelName")
}
}

nodeToComputer = new HashMap<Node, Computer>()
for(node in nodes){
computer = node.toComputer()
if(null == computer){
println("NO COMPUTER for node $nodeName")
}else{
nodeToComputer.put(node, computer)
}
}

for(node in nodes){
nodeName = node.getNodeName()
computer = nodeToComputer.get(node)

println("We have a computer for node $nodeName")
if(computer.isTemporarilyOffline()){
reason = computer.getOfflineCause()
println("Node $nodeName is already offline: $reason");
}else{
computer.setTemporarilyOffline(true)
println("Node $nodeName is set for offline.")
}
}

for(node in nodes){
nodeName = node.getNodeName()
computer = nodeToComputer.get(node)
print("Waiting for node $nodeName to finish...")
computer.waitUntilOffline()
while(computer.countBusy() != 0){
sleep(1000)
}
println("done");
}

---END LABEL SHUTDOWN SCRIPT---

---BEGIN LABEL STARTUP SCRIPT--
import hudson.model.Hudson
import jenkins.model.Jenkins
import hudson.model.Computer

println "Passed in label $labelName."

label = Jenkins.instance.getLabel(labelName)
if(!label){
println("Could not find label $labelName")
}else{
nodes = label.getNodes()
for(node in nodes){
nodeName = node.getNodeName()
println("Node $nodeName is part of label $labelName")
}
}

nodeToComputer = new HashMap<Node, Computer>()
for(node in nodes){
computer = node.toComputer()
if(null == computer){
println("NO COMPUTER for node $nodeName")
}else{
nodeToComputer.put(node, computer)
}
}

for(node in nodes){
nodeName = node.getNodeName()
computer = nodeToComputer.get(node)

println("We have a computer for node $nodeName")
if(computer.isTemporarilyOffline()){
computer.setTemporarilyOffline(false)
println("Setting Node $nodeName to online");
}else{
println("Node $nodeName is already online.")
}
}

for(node in nodes){
nodeName = node.getNodeName()
computer = nodeToComputer.get(node)
print("Waiting for node $nodeName to finish...")
computer.waitUntilOnline()
println("done");
}

---END LABEL STARTUP SCRIPT---

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[ogondza]

You can take the save offline for your timeframe. Jobs that are running
will complete but no new jobs will be scheduled before explicitly taken
back online.

Is this what you want?

--
oliver