NSS-MYHOSTNAME(8) nss-myhostname NSS-MYHOSTNAME(8) nss-myhostname libnss_myhostname.so.2 - libnss_myhostname.so.2 nss-myhostname (NSS) (glibc) gethostname(2). : o IP -- -- IPv4 127.0.0.2 ( ) IPv6 ::1 ( ). o "localhost" "localhost.localdomain" ( ".localhost" ".localhost.localdomain") IP 127.0.0.1 ::1. o "_gateway" (metric) . . o "_outbound" IPv4 IPv6 . IP . . IP . . /etc/hosts . /etc . nss-myhostname /etc/hosts . NSS "myhostname" "hosts:" /etc/nsswitch.conf. "myhostname" "files" "dns". "localhost" . nss-resolve /etc/hosts. nss-myhostname ( nss-resolve) -- IP . DNS . /etc/nsswitch.conf nss-myhostname : passwd: files systemd group: files [SUCCESS=merge] systemd shadow: files systemd gshadow: files systemd hosts: mymachines resolve [!UNAVAIL=return] files myhostname dns networks: files : db : db ethers: db rpc: db netgroup: nis getent(1) glibc': $ getent ahosts `hostname` ::1 STREAM omega ::1 DGRAM ::1 RAW 127.0.0.2 STREAM 127.0.0.2 DGRAM 127.0.0.2 RAW omega. systemd(1), nss-systemd(8), nss-resolve(8), nss-mymachines(8), nsswitch.conf(5), getent(1) 3 . . : . systemd 260.2 NSS-MYHOSTNAME(8)