NAME<\/a> nss-systemd, libnss_systemd.so.2 \u2212 UNIX user and group name resolution for user\/group lookup via Varlink<\/p>\n libnss_systemd.so.2<\/p>\n nss\u2212systemd<\/b> is a plug\u2212in module for the GNU Name Service Switch (NSS) functionality of the GNU C Library (glibc<\/b>), providing UNIX user and group name resolution for services implementing the User\/Group Record Lookup API via Varlink<\/font><\/b> [1]<\/font><\/small> , such as the system and service manager systemd<\/b>(1) (for its DynamicUser=<\/i> feature, see systemd.exec<\/b>(5) for details), systemd-homed.service<\/b>(8), or systemd-machined.service<\/b>(8).<\/font><\/p>\n This module also ensures that the root and nobody users and groups (i.e. the users\/groups with the UIDs\/GIDs 0 and 65534) remain resolvable at all times, even if they aren’t listed in \/etc\/passwd or \/etc\/group, or if these files are missing.<\/font><\/p>\n This module preferably utilizes systemd-userdbd.service<\/b>(8) for resolving users and groups, but also works without the service running.<\/font><\/p>\n To activate the NSS module, add “systemd” to the lines starting with “passwd:” and “group:” in \/etc\/nsswitch.conf.<\/font><\/p>\n It is recommended to place “systemd” after the “files” or “compat” entry of the \/etc\/nsswitch.conf lines so that \/etc\/passwd and \/etc\/group based mappings take precedence.<\/font><\/p>\n Here is an example \/etc\/nsswitch.conf file that enables nss\u2212systemd<\/b> correctly:<\/font><\/p>\n passwd: compat systemd<\/b> hosts: mymachines resolve [!UNAVAIL=return] myhostname files dns protocols: db files netgroup: nis<\/font><\/p>\n The container “rawhide” is spawned using systemd-nspawn<\/b>(1):<\/font><\/p>\n # systemd\u2212nspawn \u2212M rawhide \u2212\u2212boot \u2212\u2212network\u2212veth \u2212\u2212private\u2212users=pick $ machinectl \u2212\u2212max\u2212addresses=3 $ getent passwd vu\u2212rawhide\u22120 vu\u2212rawhide\u221281 $ getent group vg\u2212rawhide\u22120 vg\u2212rawhide\u221281 $ ps \u2212o user:15,pid,tty,command \u2212e|grep ‘^vu\u2212rawhide’ systemd<\/b>(1), systemd.exec<\/b>(5), nss-resolve<\/b>(8), nss-myhostname<\/b>(8), nss-mymachines<\/b>(8), systemd-userdbd.service<\/b>(8), systemd-homed.service<\/b>(8), systemd-machined.service<\/b>(8), nsswitch.conf<\/b>(5), getent<\/b>(1)<\/font><\/p>\n 1.<\/font><\/p>\n<\/td>\n User\/Group Record Lookup API via Varlink<\/font><\/p>\n<\/td>\n https:\/\/systemd.io\/USER_GROUP_API<\/font><\/p>\n nss-systemd, libnss_systemd.so.2 \u2212 UNIX user and group name resolution for user\/group lookup via Varlink <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[5,52,4,872],"class_list":["post-3769","post","type-post","status-publish","format-standard","hentry","category-8-administracion-del-sistema","tag-5","tag-administracion","tag-man8","tag-nss-systemd"],"gutentor_comment":0,"_links":{"self":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/posts\/3769","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/comments?post=3769"}],"version-history":[{"count":0,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/posts\/3769\/revisions"}],"wp:attachment":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/media?parent=3769"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/categories?post=3769"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/tags?post=3769"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
SYNOPSIS<\/a>
DESCRIPTION<\/a>
CONFIGURATION IN \/ETC\/NSSWITCH.CONF<\/a>
EXAMPLE: MAPPINGS PROVIDED BY SYSTEMD\u2212MACHINED.SERVICE<\/a>
SEE ALSO<\/a>
NOTES<\/a> <\/p>\n
\nNAME <\/a> <\/h2>\n
SYNOPSIS <\/a> <\/h2>\n
DESCRIPTION <\/a> <\/h2>\n
CONFIGURATION IN \/ETC\/NSSWITCH.CONF <\/a> <\/h2>\n
group: compat [SUCCESS=merge] systemd<\/b>
shadow: compat<\/font><\/p>\n
networks: files<\/font><\/p>\n
services: db files
ethers: db files
rpc: db files<\/font><\/p>\nEXAMPLE: MAPPINGS PROVIDED BY SYSTEMD\u2212MACHINED.SERVICE <\/a> <\/h2>\n
Spawning container rawhide on \/var\/lib\/machines\/rawhide.
Selected user namespace base 20119552 and range 65536.
…<\/font><\/p>\n
MACHINE CLASS SERVICE OS VERSION ADDRESSES
rawhide container systemd\u2212nspawn fedora 30 169.254.40.164 fe80::94aa:3aff:fe7b:d4b9<\/font><\/p>\n
vu\u2212rawhide\u22120:*:20119552:65534:vu\u2212rawhide\u22120:\/:\/usr\/sbin\/nologin
vu\u2212rawhide\u221281:*:20119633:65534:vu\u2212rawhide\u221281:\/:\/usr\/sbin\/nologin<\/font><\/p>\n
vg\u2212rawhide\u22120:*:20119552:
vg\u2212rawhide\u221281:*:20119633:<\/font><\/p>\n
vu\u2212rawhide\u22120 692 ? \/usr\/lib\/systemd\/systemd
vu\u2212rawhide\u22120 731 ? \/usr\/lib\/systemd\/systemd\u2212journald
vu\u2212rawhide\u2212192 734 ? \/usr\/lib\/systemd\/systemd\u2212networkd
vu\u2212rawhide\u2212193 738 ? \/usr\/lib\/systemd\/systemd\u2212resolved
vu\u2212rawhide\u22120 742 ? \/usr\/lib\/systemd\/systemd\u2212logind
vu\u2212rawhide\u221281 744 ? \/usr\/bin\/dbus\u2212daemon \u2212\u2212system \u2212\u2212address=systemd: \u2212\u2212nofork \u2212\u2212nopidfile \u2212\u2212systemd\u2212activation \u2212\u2212syslog\u2212only
vu\u2212rawhide\u22120 746 ? \/usr\/sbin\/sshd \u2212D …
vu\u2212rawhide\u22120 752 ? \/usr\/lib\/systemd\/systemd \u2212\u2212user
vu\u2212rawhide\u22120 753 ? (sd\u2212pam)
vu\u2212rawhide\u22120 1628 ? login \u2212\u2212 zbyszek
vu\u2212rawhide\u22121000 1630 ? \/usr\/lib\/systemd\/systemd \u2212\u2212user
vu\u2212rawhide\u22121000 1631 ? (sd\u2212pam)
vu\u2212rawhide\u22121000 1637 pts\/8 \u2212zsh<\/font><\/p>\nSEE ALSO <\/a> <\/h2>\n
NOTES <\/a> <\/h2>\n
\n
\n <\/td>\n \n <\/td>\n \n <\/td>\n<\/tr>\n<\/table>\n
\n","protected":false},"excerpt":{"rendered":"