systemd Developer Lennart Poettering lennart@poettering.net nss-resolve 8 nss-resolve libnss_resolve.so.2 Provide hostname resolution via systemd-resolved.service libnss_resolve.so.2 nss-resolve is a plug-in module for the GNU Name Service Switch (NSS) functionality of the GNU C Library (glibc) enabling it to resolve host names via the systemd-resolved8 local network name resolution service. It replaces the nss-dns plug-in module that traditionally resolves hostnames via DNS. To activate the NSS module, add resolve to the line starting with hosts: in /etc/nsswitch.conf. Specifically, it is recommended to place resolve early in /etc/nsswitch.conf's hosts: line (but after the files or mymachines entries), right before the dns entry if it exists, followed by [!UNAVAIL=return], to ensure DNS queries are always routed via systemd-resolved8 if it is running, but are routed to nss-dns if this service is not available. Note that systemd-resolved will synthesize DNS resource records in a few cases, for example for localhost and the current hostname, see systemd-resolved8 for the full list. This duplicates the functionality of nss-myhostname8, but it is still recommended (see examples below) to keep nss-myhostname configured in /etc/nsswitch.conf, to keep those names resolveable if systemd-resolved is not running. Here is an example /etc/nsswitch.conf file that enables nss-resolve correctly: passwd: compat mymachines systemd group: compat mymachines systemd shadow: compat hosts: files mymachines resolve [!UNAVAIL=return] dns myhostname networks: files protocols: db files services: db files ethers: db files rpc: db files netgroup: nis systemd1, systemd-resolved8, nss-systemd8, nss-myhostname8, nss-mymachines8, nsswitch.conf5