Hi team,
       
      We found an issue in the kubernetes plugin. The field nodeSelector in the kubernetes cloud doesn't work as expected. We will try to keep builds isolated in different nodes with a Cluster Autoscaler.
      Piece of yaml:
      ```
            image: jenkins/inbound-agent:4.3-4
            imagePullPolicy: IfNotPresent
            name: jnlp
            resources:
              limits:
                cpu: 200m
                memory: 300Mi
              requests:
                cpu: 100m
                memory: 256Mi
            terminationMessagePath: /dev/termination-log
            terminationMessagePolicy: File
            volumeMounts:
            - mountPath: /home/jenkins/agent
              name: workspace-volume
            - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
              name: xxxxxx
              readOnly: true
            - mountPath: /var/run/xxxx
              name: xxxx
              readOnly: true
          dnsPolicy: ClusterFirst
          enableServiceLinks: true
          nodeName: xxxxx
          nodeSelector:
            kubernetes.io/os: linux
          priority: 0
          restartPolicy: Never
          schedulerName: default-scheduler
          securityContext:
            fsGroup: 1000
          serviceAccount: xxxx
          serviceAccountName: xxxx
          terminationGracePeriodSeconds: 30
          tolerations:
          - effect: NoExecute
            key: node.kubernetes.io/not-ready
            operator: Exists
            tolerationSeconds: 300
          - effect: NoExecute
            key: node.kubernetes.io/unreachable
            operator: Exists
            tolerationSeconds: 300
      ```
       
      As you can see in the attached image we have configured this in our kubernetes cloud (this is our default cloud) inside jenkins configuration, but when we launch a new job, it's not built as expected. We need to configure each yaml from each pipeline with the selector because this option is not worked properly.
       
       
      Versions:
      Jenkins version: 2.263.4
      Kubernetes version: 1.18.9
      Kubernetes plugin version: 1.29.2
       
      Thank you in advance.

          [JENKINS-65031] Kubernetes plugin nodeSelector

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            blopezp Borja
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