Stuff to Remember About Kubernetes Storage
- Everything in Kubernetes (mostly) communicates by IP network
- PV are cluster scoped (never in namespace)
- Adding PV is like plugging in a disk
- PVC always has a name space
- PVC always requires a PV to go with
- PV may get created automatically by SC controller
- With a
manual PV type you are the SC “controller”
- Using
manual means you have to delete yourself, etc.
- NFS has built-in support in Kubernetes
- PVC in same namespace is automatically mounted in app
- PV claims will be stay after pod delete if ReclaimPolicy Retain
- Retail seems to be default ReclaimPolicy
- Deleting claims manually is a great way to lose all your data
- Even when PVC is deleted, PV shows last claim in
k get pv
- Look at the Status for Released to be sure PV is available
k explain supports dotted notation- PV cannot be divided with smaller Request PVC, gets all of it
- Best “filled storage” monitoring is Pod using same PV with
du/df
- Only one “monitor” is required per StorageClass (generally)
Recommendations from the community (so far):
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