vault replication across regions

[raoofm]

It would be great to have a way to specify a secondary vault cluster running in a different region(DC) via vault-operator. Similar to what vault has as a secondary performace/DR replication.

Right now as there is no way to specify an existing etcd cluster #303 to be used by vault-operator, it is not possible to solve the DR problem by using etcd make-mirror tool.

So if #303 is solved then replication for DR will be possible but still some work is needed to be done in vault-operator to enable performance or keys only mirroring for below depoyment config 1 active writable n active readable across regions n standby across regions

[lcgkm]

Using replication requires a storage backend that supports transactional updates, such as Consul.

https://www.vaultproject.io/docs/internals/replication.html