kubelet podConfig - Providing Pods Running on kubelet
The podConfig
within the kubelet is used to aggregate information from multiple sources related to pods. It processes and aggregates information from various sources of pods (deduplication, analysis of changes in pods). If there are changes in pods from these sources, podConfig
updates and aggregates the changes, generating various types of PodUpdate
messages and sending them to the PodUpdate
channel.
Event Generation Mechanism in Kubernetes
Smooth Rolling Update of Ingress Controller Using AWS NLB - No Service Interruption
Kubelet Startup - Command Execution
kubenet IP Leak
Kubelet Startup - FeatureGate Initialization
Kubernetes has many feature functionalities, and these features are generally associated with Kubernetes Enhancement Proposals (KEPs). Feature functionalities go through stages of development such as alpha, beta, GA (Generally Available), and deprecated. Alpha signifies an unstable phase, beta is relatively stable but may contain bugs, GA indicates full stability and usability, and deprecated means the feature is being phased out. The lifecycle of a feature typically involves the proposal of a KEP, alpha phase, beta phase, GA phase, and eventual deprecation. Features in the alpha phase are not enabled by default, while features in beta are enabled by default. For more information on feature gates, visit the Feature Gates documentation and KEP documentation.
Feature gates are used to control whether a specific feature is enabled or disabled. It’s important to note that GA features cannot be disabled. In this article, we’ll use the kubelet source code as an example to analyze how feature gates work.