1. What is a resource
All the contents in K8S are abstracted as resources. After the resources are instantiated, they are called objects.
Two, cluster resource classification
- Namespace level
- Cluster level
- Metadata type
2.1 Namespace level
- Workload resources (workload): Pod, ReplicaSet, Deployment, StatefulSet, DaemonSet, Job, CronJob
- Service discovery and load balancing resources (ServiceDiscovery LoadBalance): Service, Ingress,...
- Configuration and storage resources: Volume (storage volume), CSI (container storage interface, which can expand various third-party storage and storage volumes)
- Special types of storage volumes: ConfigMap (the type of resource used when the configuration center is used), Secret (save sensitive data), DownwardAPI (output information in the external environment to the container)
2.2 Cluster-level resources
Namespace、Node、Role、ClusterRole、RoleBinding、ClusterRoleBinding
2.3 Metadata resources
HPA 、 PodTemplate 、 LimitRange