CODEWITHSUNDEEP
pythonkubernetes
torxx666
torxx666

Reputation: 31

How to retrieve the current cluster name in k8s from python?

I need to set my environment in my code based on kubernetes(in AKS) cluster name in python. I have 2 clusters stg-my-cluster, prod-my-cluster, How can I access to this info from inside my pod? there is a better way ? thx

Upvotes: 0

Views: 2155

Answers (2)

torxx666
torxx666

Reputation: 31

here is a hack I found in order to get it ( not directly the cluster name, but the resourceGroup )

clusters = set()
config.load_incluster_config()
core = client.CoreV1Api()
configmaps = core.list_namespaced_config_map('kube-system', timeout_seconds=10)


for item in configmaps.items:
    try:
        cluster = (item.__dict__)['_data']['CLUSTER_RESOURCE_ID']
        if  cluster:
            cluster_resource_id = re.search(r"resourceGroups/([\s\S]+)/providers",cluster).group(1)
            clusters.add(cluster_resource_id)
    except:
        pass

In my case, I use a resourceGroup per env. So I just have to :

if 'my-resource-group-production' in clusters:
    .....

Upvotes: 0

David Maze
David Maze

Reputation: 160013

Once you're inside the cluster, it doesn't know that it has a "name". This only exists for management tools, such as the context name in your .kube/config file.

The setup I use day-to-day uses Helm as the primary installation mechanism, and there is a separate Helm values file per environment. Our CD system knows how to helm upgrade -f $CLUSTER_NAME.yaml. In that file we set:

# values.prod.yaml
cluster: prod-my-cluster

And then you can include that as an environment variable in your Deployment:

env:
  - name: CLUSTER
    value: {{ .Values.cluster }}

Once you have it in an environment variable, in Python you can access it using os.environ.

Upvotes: 3

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