Kubernetes Hostname Management
Question
Your web application uses Google Kubernetes Engine to manage several workloads.
One workload requires a consistent set of hostnames even after pod scaling and relaunches.
Which feature of Kubernetes should you use to accomplish this?
Answers
Explanations
Click on the arrows to vote for the correct answer
A. B. C. D.A.
The correct answer is A. StatefulSets.
Explanation:
When using Kubernetes to manage workloads, scaling and relaunching of pods can cause changes in the hostnames of the workloads. However, in some cases, it is necessary for a workload to maintain a consistent set of hostnames even after scaling and relaunches.
One solution to this problem is to use StatefulSets. StatefulSets are a Kubernetes feature that provides guarantees about the identity and ordering of pods. They are designed to handle stateful workloads, where each pod requires a stable, unique identity.
StatefulSets ensure that each pod in the set has a unique and stable hostname based on a predictable naming convention. When scaling the workload, new pods are created with a new hostname based on the same naming convention, and existing pods maintain their existing hostname.
In contrast, using container environment variables or persistent volumes may not be sufficient for maintaining consistent hostnames in a scalable and reliable way. Container environment variables can be modified at runtime and are not necessarily unique, while persistent volumes are typically used for data storage rather than hostname management.
Role-based access control (RBAC) is also a Kubernetes feature, but it is not directly relevant to the problem of maintaining consistent hostnames for a workload. RBAC is used to control access to Kubernetes resources based on roles and permissions, rather than to manage workload properties such as hostnames.
