Stateful Storage

Persistent volumes and claims. What survives a restart, and what does not.

Format.puml
Length30 lines
LibraryKubernetes icons

The source

30 lines of PlantUML, and pulls in Kubernetes icons. Copy it, or open the template inside Gnomon and render it as it is.

@startuml
!define KubernetesPuml https://raw.githubusercontent.com/dcasati/kubernetes-PlantUML/master/dist
!include KubernetesPuml/kubernetes_Common.puml
!include KubernetesPuml/kubernetes_Simplified.puml
!include KubernetesPuml/OSS/KubernetesSts.puml
!include KubernetesPuml/OSS/KubernetesPod.puml
!include KubernetesPuml/OSS/KubernetesPvc.puml
!include KubernetesPuml/OSS/KubernetesPv.puml
!include KubernetesPuml/OSS/KubernetesSc.puml

title Kubernetes — Stateful storage

KubernetesSts(sts, "postgres", "2 replicas")
KubernetesPod(pod1, "postgres-0", "")
KubernetesPod(pod2, "postgres-1", "")
KubernetesPvc(pvc1, "data-postgres-0", "20Gi")
KubernetesPvc(pvc2, "data-postgres-1", "20Gi")
KubernetesPv(pv1, "pv-a", "")
KubernetesPv(pv2, "pv-b", "")
KubernetesSc(sc, "fast-ssd", "dynamic")

sts --> pod1
sts --> pod2
pod1 --> pvc1
pod2 --> pvc2
pvc1 --> pv1
pvc2 --> pv2
sc ..> pv1
sc ..> pv2
@enduml

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Others in Kubernetes diagrams

Cluster OverviewThe whole cluster at a glance. The one to draw first.
Ingress to PodsIngress to service to pods. How traffic actually gets in.
Workload and ConfigurationDeployments with their config and secrets attached.
RBACRoles and bindings. The diagram that finds the over-permissive service account.