[Pdns-users] Systemctl Daemon Problem After each pdns upgrade

[IHI IHI]

Hello
When upgrading to a new version(PowerDNS Recursor v4.7-->4.8-->4.9-->5),
despite choosing to keep the current configuration file,but its tuning
parameters at
pdns-recursor.service(/lib/systemd/system/pdns-recursor.service) will
return to its default values!
for example:
# my Tuning
LimitNOFILE=65536
returns to the default value--->16384
This problem causes the pdns-recursive daemon to be reconfigured and
restarted again after each new version upgrading.
Is this normal behavior or can it be fixed?
Many Thanks for your efforts.
Habibi
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