Use context: kubectl config use-context k8s-c1-H
Write the names of all namespaced Kubernetes resources (like Pod, Secret, ConfigMap…) into /opt/course/16/resources.txt.
Find the project-* Namespace with the highest number of Roles defined in it and write its name and amount of Roles into /opt/course/16/crowded-namespace.txt.
Managing Kubernetes Namespace Resources: Identifying and Analyzing Roles
Kubernetes namespaces are used to organize and manage resources within a cluster, making it easier to manage complex environments. In this guide, we’ll explore how to list all namespace-scoped resources in a Kubernetes cluster and identify which namespace has the most roles defined.
Step 1: Listing All Namespaced Resources
Kubernetes provides a wealth of resources that can be scoped to namespaces. To get a complete list of these resources, you can use the kubectl api-resources command. This command shows all available API resources and allows you to filter them based on whether they are namespace-scoped.
Start by listing all namespaced resources:
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kubectl api-resources --namespaced -o name > /opt/course/16/resources.txt |
This command generates a file resources.txt containing all the namespaced resources in your cluster.
The content of the resources.txt file will look something like this:
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# /opt/course/16/resources.txt bindings configmaps endpoints events limitranges persistentvolumeclaims pods podtemplates replicationcontrollers resourcequotas secrets serviceaccounts services controllerrevisions.apps daemonsets.apps deployments.apps replicasets.apps statefulsets.apps localsubjectaccessreviews.authorization.k8s.io horizontalpodautoscalers.autoscaling cronjobs.batch jobs.batch leases.coordination.k8s.io events.events.k8s.io ingresses.extensions ingresses.networking.k8s.io networkpolicies.networking.k8s.io poddisruptionbudgets.policy rolebindings.rbac.authorization.k8s.io roles.rbac.authorization.k8s.io |
This list includes various Kubernetes resources like Pods, ConfigMaps, Services, and Roles, all of which can be scoped within namespaces.
Step 2: Finding the Namespace with the Most Roles
Roles in Kubernetes are used to grant permissions to resources within a namespace. To determine which namespace has the most roles, we’ll check each namespace individually and count the number of roles.
Here’s how you can count the number of roles in each namespace:
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kubectl -n project-c13 get role --no-headers | wc -l kubectl -n project-c14 get role --no-headers | wc -l kubectl -n project-hamster get role --no-headers | wc -l kubectl -n project-snake get role --no-headers | wc -l kubectl -n project-tiger get role --no-headers | wc -l |
The output will show the number of roles in each namespace. For example:
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project-c13: 0 roles project-c14: 300 roles project-hamster: 0 roles project-snake: 0 roles project-tiger: 0 roles |
In this case, project-c14 has the most roles with a total of 300.
Step 3: Writing the Results to a File
Finally, let’s record the namespace with the most roles into a text file for reference:
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# /opt/course/16/crowded-namespace.txt project-c14 with 300 resources |
This file indicates that project-c14 is the namespace with the most roles, highlighting its significance in the cluster.
Conclusion
In this guide, we’ve demonstrated how to list all namespaced resources in Kubernetes and identify the namespace with the most roles. This information is valuable for understanding the distribution of resources in your cluster and managing permissions effectively. By keeping track of these details, you can ensure your Kubernetes environment remains organized and secure.