UDM-SE: Boot script to add custom DNS records in dnsmasq

00-create_local_dns_conf.sh

#!/bin/sh

# We'll plug the overriding configurations into /run/dnsmasq.conf.d/
cat > /run/dnsmasq.conf.d/local_custom_dns.conf <<- 'EOF'
	# Add an A record to a specific server (i.e. override)
	address=/double-click.net/127.0.0.1
	# Or a SRV record, if needed
	srv-host=_ldap._tcp.example.com,ldapserver.example.com,389
	# You can even add MX records as you wish
	mx-host=maildomain.com,servermachine.com,50
EOF

# Restart dnsmasq so it sees the new conf file
kill `cat /run/dnsmasq.pid`

Needs this to be bootable. Note unifios-utilities/on-boot-script will install CNI stuff and you may not need them. This can be resolved by creating dummy files:

mkdir -p /data/on_boot.d
cat > /data/on_boot.d/05-install-cni-plugins.sh <<- 'EOF'
	#!/bin/sh
	echo "Skip executing CNI plugins installer..."
EOF
cat > /data/on_boot.d/06-cni-bridge.sh <<- 'EOF'
	#!/bin/sh
	echo "Skip executing CNI bridge installer..."
EOF
chmod +x /data/on_boot.d/05-install-cni-plugins.sh /data/on_boot.d/06-cni-bridge.sh

or simply install the script manually.