Kube-capacity is a command-line interface (CLI) tool designed to provide a comprehensive overview of resource requests, limits, and utilization within a Kubernetes cluster. It aims to combine the best features of kubectl top and kubectl describe into a single CLI tool focused specifically on cluster resource management.
Here’s a detailed explanation of kube-capacity’s features and functionalities:
- Resource Overview: Kube-capacity offers an overview of resource allocation and utilization within a Kubernetes cluster. It gathers information about resource requests and limits set on pods and nodes, as well as the actual resource utilization, providing insights into resource usage across the cluster.
- CLI Convenience: As a CLI tool, kube-capacity offers a convenient and efficient way to retrieve resource-related information from a Kubernetes cluster. Users can execute commands directly from the terminal or incorporate kube-capacity into automated scripts and workflows for monitoring and managing cluster resources.
- Combination of Features: Kube-capacity combines the functionalities of kubectl top and kubectl describe to provide a more comprehensive view of cluster resources. It allows users to inspect individual pods, nodes, or namespaces while also aggregating data to provide an overall summary of resource utilization across the cluster.
- Resource Requests and Limits: Kube-capacity displays information about resource requests and limits defined in pod specifications. This includes CPU and memory requests and limits, which are used by Kubernetes to schedule and allocate resources effectively across nodes in the cluster.
- Utilization Metrics: In addition to resource requests and limits, kube-capacity also provides insights into actual resource utilization within the cluster. It gathers metrics on CPU and memory usage for pods and nodes, allowing users to identify potential resource bottlenecks or inefficiencies.
- Documentation and Resources: More information about kube-capacity, including installation instructions, usage examples, and configuration options, can be found on the official GitHub repository (https://github.com/robscott/kube-capacity). The repository contains comprehensive documentation, FAQs, and community resources to help users get started with kube-capacity and effectively monitor and manage resources in their Kubernetes clusters.
kube-capacity Command Examples
1. Output a list of nodes with the total CPU and Memory resource requests and limits:
# kube-capacity
2. Include pods:
# kube-capacity -p
3. Include utilization:
# kube-capacity -u
Summary
Overall, kube-capacity offers a valuable tool for Kubernetes cluster administrators and operators to gain insights into resource usage and optimize resource allocation across the cluster. By combining the functionalities of existing kubectl commands into a focused and intuitive CLI tool, kube-capacity simplifies the process of monitoring and managing cluster resources, helping to ensure efficient utilization and optimal performance of Kubernetes workloads.