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Unit: named.service (Debian/Ubuntu) or bind9.service (newer Debian)
Config (Debian/Ubuntu): /etc/bind/named.conf, /etc/bind/named.conf.options, /etc/bind/named.conf.local, /etc/bind/named.conf.default-zones
Config (RHEL/Fedora): /etc/named.conf, /etc/named/ (included zone configs)
Zone dir (Debian): /var/lib/bind/ (dynamic/slave zones), /etc/bind/ (static master zones)
Zone dir (RHEL): /var/named/
Logs: journalctl -u named / journalctl -u bind9, /var/log/named/ (if configured), journalctl -u named -f for live
Runtime control socket: rndc communicates with named via port 953 (loopback only by default)
Distro install: apt install bind9 bind9utils / dnf install bind bind-utils

bind9