nss-resolve(8) — Linux manual page

NAME \| SYNOPSIS \| DESCRIPTION \| EXAMPLE \| SEE ALSO \| COLOPHON

NSS-RESOLVE(8)                 nss-resolve                NSS-RESOLVE(8)

NAME top

       nss-resolve, libnss_resolve.so.2 - Hostname resolution via
       systemd-resolved.service

SYNOPSIS top

       libnss_resolve.so.2

DESCRIPTION top

       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 hostnames via the systemd-resolved(8) 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 [!UNAVAIL=return]" 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. It should be before the
       "files" entry, since systemd-resolved supports /etc/hosts
       internally, but with caching. To the contrary, it should be after
       "mymachines", to give hostnames given to local VMs and containers
       precedence over names received over DNS. Finally, we recommend
       placing "dns" somewhere after "resolve", to fall back to nss-dns
       if systemd-resolved.service is not available.

       Note that systemd-resolved will synthesize DNS resource records
       in a few cases, for example for "localhost" and the current local
       hostname, see systemd-resolved(8) for the full list. This
       duplicates the functionality of nss-myhostname(8), 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.

EXAMPLE top

       Here is an example /etc/nsswitch.conf file that enables
       nss-resolve correctly:

           passwd:         compat systemd
           group:          compat [SUCCESS=merge] systemd
           shadow:         compat

           hosts:          mymachines resolve [!UNAVAIL=return] files myhostname dns
           networks:       files

           protocols:      db files
           services:       db files
           ethers:         db files
           rpc:            db files

           netgroup:       nis

COLOPHON top

       This page is part of the systemd (systemd system and service
       manager) project.  Information about the project can be found at
       ⟨http://www.freedesktop.org/wiki/Software/systemd⟩.  If you have
       a bug report for this manual page, see
       ⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.
       This page was obtained from the project's upstream Git repository
       ⟨https://github.com/systemd/systemd.git⟩ on 2020-12-18.  (At that
       time, the date of the most recent commit that was found in the
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       problems in this HTML version of the page, or you believe there
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       (which is not part of the original manual page), send a mail to
       man-pages@man7.org

systemd 247                                               NSS-RESOLVE(8)

Pages that refer to this page: systemd.directives(7), systemd.index(7), nss-myhostname(8), nss-mymachines(8), nss-systemd(8), systemd-resolved.service(8)

nss-resolve(8) — Linux manual page

NAME top

SYNOPSIS top

DESCRIPTION top

EXAMPLE top

SEE ALSO top

COLOPHON top