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Add pod counter to provide index attribute for pods in a ReplicaSet #131

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Add pod counter to provide index attribute for pods in a ReplicaSet #131

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f82a1cc
Add pod counter to provide index attribute for pods in a deployment R…
May 5, 2022
4ec6366
Provide an example in the comment explaining how a ReplicaSet is inde…
Jun 6, 2022
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26 changes: 24 additions & 2 deletions contents/pods-resource-model.py
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Original file line number Diff line number Diff line change
Expand Up @@ -37,7 +37,7 @@ def get(self, path, default=None):
log = logging.getLogger('kubernetes-model-source')


def nodeCollectData(pod, container, defaults, taglist, mappingList, boEmoticon):
def nodeCollectData(pod, container, defaults, taglist, mappingList, boEmoticon, index):
tags = []
tags.extend(taglist.split(','))

Expand Down Expand Up @@ -105,6 +105,9 @@ def nodeCollectData(pod, container, defaults, taglist, mappingList, boEmoticon):
mappings = []
custom_attributes = {}

# Count pods within their owner
custom_attributes['index'] = index

# custom mapping attributes
if mappingList:
log.debug('Mapping: %s', mappingList)
Expand Down Expand Up @@ -256,6 +259,9 @@ def main():

node_set = []

# Used to count child pods, particularly of a (possibly autoscaling) ReplicaSet.
parents = {}

ret = collect_pods_from_api(namespace_filter, label_selector, field_selector)

for i in ret.items:
Expand All @@ -266,12 +272,28 @@ def main():
i.metadata.name,
container.name)

# For scalable pods in a deployment, the ReplicaSet of a pod is the pod name with the last dash-separated
# token stripped off. If we have seen the ReplicaSet already, increment the counter. Otherwise, initialize
# this as the first pod in the ReplicaSet.
#
# For example, the deployment "my-deployment" might create a ReplicaSet named "my-deployment-5ffd8f676d"
# and one of the pods within the ReplicaSet might be identified as "my-deployment-5ffd8f676d-ccwbf". By
# removing the suffix that identifies the pod, we index resources within the parent group. In this way, we
# can ensure that only one pod per ReplicaSet runs a command by filtering the nodes in Rundeck to include
# only those where index is equal to 1.
parent_name = '-'.join(i.metadata.name.split('-')[0:-1])
if parent_name in parents:
parents[parent_name] += 1
else:
parents[parent_name] = 1

node_data = nodeCollectData(i,
container,
defaults,
tags,
mappingList,
boEmoticon
boEmoticon,
parents[parent_name]
)

if running is False:
Expand Down