BuildOn pod NodeAffinity
- Jeyanthi (Unlicensed)
Create label to run the buildon pod in a particular slave node using node affinity.
To get the slavenodename: kubectl get nodes
To create label for the k8s cluster node: kubectl label nodes <slavenodename> labelnode1=nodelabel
To Show label: kubectl get nodes --show-labels | grep slavelabel
To delete label: kubectl label nodes <slavenodename> labelnode1-
Example command using Node Affinity for ubuntu image:
kubectl run -i --tty ubuntu --rm --image=ubuntu --restart=Never --overrides='
{
"apiVersion": "v1",
"kind": "Pod",
"metadata": {
"name": "ubuntupoc"
},
"spec": {
"affinity": {
"nodeAffinity": {
"requiredDuringSchedulingIgnoredDuringExecution": {
"nodeSelectorTerms": [
{
"matchExpressions": [
{
"key": "labelnode1",
"operator": "In",
"values": [
"nodelabel"
]
}
]
}
]
}
}
}
}
}
'
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Enable Node Affinity for buildon pod. Change buildon.py "kubectl run" step as shown below.
===========================================================================
As-Is:
| subprocess.Popen(['kubectl run '+ self.uid +' -i --tty --rm --restart=Never --image='+imagename+ ' --env="commitID='+self.uid+'" --env="branchName='+self.tuid+'" --env="gitURL='+self.httpurl+'" --env="KUBEMASTER='+self.host_ip+'" --env="UPLOADPORT='+self.upload_port+'" --env="scmServiceAccount='+self.scmServiceAccount+'"'], shell=True) |
To Be:
subprocess.Popen(['kubectl run '+ self.uid +' -i --tty --rm --restart=Never --image='+imagename+ ' --overrides='{ "apiVersion": "v1","kind":"Pod", "metadata": {"name": "buildonslave"},"spec": {"affinity": {"nodeAffinity": {"requiredDuringSchedulingIgnoredDuringExecution":{"nodeSelectorTerms": [ { "matchExpressions": [ { "key": "labelnode1", "operator": "In", "values": [ "nodelabel"]}]}]}}}}}' --env="commitID='+self.uid+'" --env="branchName='+self.tuid+'" --env="gitURL='+self.httpurl+'" --env="KUBEMASTER='+self.host_ip+'" --env="UPLOADPORT='+self.upload_port+'" --env="scmServiceAccount='+self.scmServiceAccount+'"'], shell=True)
Reference: https://kubernetes.io/docs/concepts/configuration/assign-pod-node/