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/etc/resolv.conffile is just an implementation detail, it is not as essential as this answer implies. The definitive mechanism for applications to do name resolution is via library functions. These functions can make use ofresolv.confor they may not. Depending on how it is configured, systemd-resolved can make use of an existingresolv.confprovided by e.g. resolvconf(8), or it can optionally provide/etc/resolv.confvia a symlink to a systemd-resolved maintained version of the file. See freedesktop.org/software/systemd/man/…nsswitch.confis a libc feature and alternate libc libraries need follow this. I described how glibc and the attendent NSS libraries work. Ubuntu and Debian, out of box, do as I describe.resolvconf?