Dns cluster config

Good day

Please tell me, I am building a DNS cluster from two DNS servers. Please tell me, should the parameter DNS_CLUSTER_SYSTEM=‘hestia-zone’ be added on the master and on the slave or only on the master and leave the parameter DNS_CLUSTER_SYSTEM=‘hestia’ on the slave

Unfortunately, it is not entirely clear from the documentation. Please help. Thank you!

Master needs to be DNS_CLUSTER_SYSTEM=‘hestia-zone’

Slave doesn’t matter unless it also acts as a master server