Comment 21 for bug 1879798

Verified Bionic/Train:

Before:

$ juju ssh designate-bind/0 -- sudo rndc showzone example.com.
zone "example.com" { type slave; file "slave.example.com.887b48bd-b5ec-4b07-9678-4fc4fe843686"; masters { 10.5.3.211 port 5354; 10.5.1.86 port 5354; 10.5.3.35 port 5354; }; };

juju add-unit designate # 10.5.2.227

zone is not updated on designate-bind unit to include the new zone master.

After:

juju remove-unit designate/0 # 10.5.3.35

$ juju ssh designate-bind/0 -- sudo rndc showzone example.com.
zone "example.com" { type slave; file "slave.example.com.887b48bd-b5ec-4b07-9678-4fc4fe843686"; masters { 10.5.2.227 port 5354; 10.5.1.86 port 5354; 10.5.3.211 port 5354; }; };