workflow - allocate node(s) for user?

[Les Mikesell]

Is there - or could there be - a workflow step that pre-allocates and
locks a set of nodes that a given user is allowed to use? Under the
covers, this might involve spinning up some VMs and/or waiting for
other jobs to complete on nodes with the requested label(s). For
some test jobs it may be necessary to have a guarantee of exclusive
access on multiple nodes before starting.

--
Les Mikesell
lesmi...@gmail.com

[Jesse Glick]

On Wednesday, December 24, 2014 1:16:10 PM UTC-5, LesMikesell wrote:

Is there - or could there be - a workflow step that pre-allocates and
locks a set of nodes that a given user is allowed to use?

The access control aspect can be handled by independent plugins, such as

https://jenkins-enterprise.cloudbees.com/docs/user-guide-docs/foldersplus-sect-controlledslaves.html

in Jenkins Enterprise by CloudBees (but there may be other ways of doing this I am less familiar with).

“Waiting for other jobs to complete” is automatic; the ‘node’ step will simply defer its body until it can grab an open executor slot on a matching node.

For some test jobs it may be necessary to have a guarantee of  exclusive
access on multiple nodes before starting.

Well Workflow 1.2 will have a ‘waitUntil’ step so I guess you could make a DIY semaphore:

def acquired = 0

def branch(label) {

  node(label) {

    acquired++

    waitUntil {acquired == 2}

    // run stuff on this node

  }

}

parallel server: {branch('server')}, client: {branch('client')}

This is prone to deadlocks, though. Making a deadlock-free semaphore is trickier (you need to sometimes back out of a workspace lock and wait before trying again); probably best left to a custom step.

[Åsmund Østvold]

Les, did you find a solution that worked for you? 

Do anybody have a working solution they could share?

Regards,

Asmund

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