In Oracle Solaris 11.4, you do not edit the /etc/resolv.conf file directly to make persistent changes to a DNS client. All DNS client configuration is managed by the dns/client SMF service instance. For information about how to enable a DNS client, see How to Configure a DNS Client in Oracle Solaris in Configuring and Managing Network Components in Oracle Solaris 11.4.
# svcs -xv dns/client:default
# more /var/svc/log/network-dns-client:default.log
# svcprop -p config/nameserver dns/client
# svcprop -p config/search dns/client
# svcprop -p config dns/client