DECOMISSION.md

Decommission a Pool in Operator

Decommission using mc

First you need to pick a pool that you need to decommission.

mc admin decommission start myminio/ https://minio-ss-0-{0...3}.minio-hl..svc.cluster.local/export{0...3}

Then monitor the status of the decommissioned pool

mc admin decom status myminio/

More details documentation available here

Update tenant.yaml

After the pool says completed you can remove the pool from your tenant.yaml and apply the change using kubectl apply -f <tenant.yaml>.

Caveats

Tenant CRD does not mandate spec.pools[].Name to be non-empty, however to safely perform decommission of a pool it is mandatory to have a spec.pools[].Name. if a spec.pools[].Name is empty for any pool removal of that pool is rejected. Following changes are necessary in such scenarios to proceed with removal of the pool.

First figure out what is the current autogenerated ssName (statefulset name) of the individual pools:

kubectl get tenants -n <namespace> <tenant_name> | jq '.status.pools[].ssName'

A practical example:

~ kubectl get tenants -n ns-1 all-nodes -o json | jq '.status.pools[].ssName'
"worker-ss-0"
"worker-ss-1"

In this case your tenant name is worker and pools are ss-0 and ss-1, proceed to make following changes to your tenant.yaml

spec:
  pools:
	...
	- name: "ss-0"
	...
	...
	- name: "ss-1"
	...
	...

NOTE: This applies to helm chart users as well