support use default storageClassClassName and define global.storageClassName

[weironz]

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Feature Request

Describe the feature you'd like: when use helm install tidb cluster, support the follow feature for storage configure:

1、support use default storageClassClassName in kubernetes if user not define storageClassClassName itself 2、suport define global.storageClassName in helm charts

Describe alternatives you've considered: it will make install easyer.

Teachability, Documentation, Adoption, Migration Strategy:

[mikechengwei]

We recommend using yaml instead of helm to install the cluster, ref: https://github.com/pingcap/tidb-operator/tree/master/examples.

[weironz]

helm will be easy for configuration and install , rook operator and rook cluster is a good example.

[weironz]

The tidb cluster helm chart seems to be no longer maintained.

it still updateing

but here say it DEPRECATED

root@ubuntu:~# helm search repo tidb
NAME                    CHART VERSION   APP VERSION     DESCRIPTION                                       
pingcap/tidb-backup     v1.5.1                          DEPRECATED(refer new instructions at https://do...
pingcap/tidb-cluster    v1.5.1                          DEPRECATED(refer new instructions at https://do...
pingcap/tidb-drainer    v1.5.1                          A Helm chart for TiDB Binlog drainer.             
pingcap/tidb-lightning  v1.5.1                          A Helm chart for TiDB Lightning                   
pingcap/tidb-operator   v1.5.1          v1.5.1          tidb-operator Helm chart for Kubernetes