Pipeline help please!

[Sam K]

I have 4 sets of IP addresses separated by commas.  It'm converting the string to a list and using the parallel block to execute them in parallel.  

Problem: I am unable to get the IP addresses within the parallel blocks. As you can see the branch name is interpreted properly.  However, within the stage block, its not getting the value. 

What is the variable I'm missing?  Thanks!

Pipeline code: 

def PAIRS = '1.1.1.1 2.2.2.2, 3.3.3.3 4.4.4.4, 5.5.5.5 6.6.6.6, 7.7.7.7 8.8.8.8'

   

   node ('jenkins-slave-1') {

     def s = PAIRS.tokenize(',')

     echo "Got the IP Addresses" + s

     def branches = [:]

     for (ip in s) {

        echo "For Loop: " + ip 

        branches["${ip}"] = {

           stage ('pair') {

              echo "Inside stage got this IP: " + ip

              //echo "Inside stage:" + "${ip}"

              sleep 5

        }

      }

   }

   parallel branches    

   }    

Output:

[1.1.1.1 2.2.2.2] Inside stage got this IP:  7.7.7.7 8.8.8.8
[Pipeline] [1.1.1.1 2.2.2.2] sleep
[1.1.1.1 2.2.2.2] Sleeping for 5 sec
[Pipeline] [ 3.3.3.3 4.4.4.4] echo
[ 3.3.3.3 4.4.4.4] Inside stage got this IP:  7.7.7.7 8.8.8.8
[Pipeline] [ 3.3.3.3 4.4.4.4] sleep
[ 3.3.3.3 4.4.4.4] Sleeping for 5 sec
[Pipeline] [ 5.5.5.5 6.6.6.6] echo
[ 5.5.5.5 6.6.6.6] Inside stage got this IP:  7.7.7.7 8.8.8.8
[Pipeline] [ 5.5.5.5 6.6.6.6] sleep
[ 5.5.5.5 6.6.6.6] Sleeping for 5 sec
[Pipeline] [ 7.7.7.7 8.8.8.8] echo
[ 7.7.7.7 8.8.8.8] Inside stage got this IP:  7.7.7.7 8.8.8.8
[Pipeline] [ 7.7.7.7 8.8.8.8] sleep
[ 7.7.7.7 8.8.8.8] Sleeping for 5 sec

[Sam K]

Anyone?  

[Jason Swager]

This should help: https://github.com/jenkinsci/pipeline-examples/blob/master/docs/BEST_PRACTICES.md#groovy-gotchas

[Sam K]

Thanks Jason.  I guess I'll have to figure something else out to get those values inside the loops.  :) 

[Sam K]

So looks like parallel is for running multiple hard-coded jobs in parallel.  No way to supply arguments to the jobs?  I even tried writing the values to a temp file and trying to read from it.  But looks like the for loop gets executed 4 times first with the last value in the temp file and the parallel block kicks in and reads the temp file all at once?  

On Friday, September 30, 2016 at 11:54:32 AM UTC-7, Sam K wrote:

[corneil....@gmail.com]

Look at https://jenkins.io/doc/pipeline/examples/

Assign ip at start of block.

branches ["$ip"] = {
    def ipAddress = ip
    // use ipAddress instead of ip

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[Sam K]

Thanks Corneil, but I had already tried that and it did not work.  But your link sure helped and its now working as expected.  Let me post the working solution as a separate reply.  :) :) 

[Sam K]

Thanks everyone!  I got it working exactly as I wanted.  For any others struggling with the same, here is the solution.  Hope it helps someone!  :)

Pipeline job will take parameters like this:

The pipeline code:

def ippair = IPADDRESSES.tokenize(",")

// The map we'll store the parallel steps in before executing them.

def stepsForParallel = [:]

for (int i = 0; i < ippair.size(); i++) {

    // Get the actual string here.

    def s = ippair.get(i)

    def stepName = "echoing ${s}"

    

    stepsForParallel[stepName] = parallelstep(s)

}

parallel stepsForParallel

def parallelstep(inputString) {

    return {

        node {

            stage('Pair:' + inputString) {

                echo "Working on the pair:"  + inputString

                ip = inputString.tokenize()

                echo "The first IP is: " + ip[0]

                echo "The second IP is: " + ip[1]

            } //stage block

        } // node block

    } //return block

    

}

End output is a list of stages which is variable based on how many pairs of IP's were supplied as parameters.  Which is one I wanted exactly.