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Shell Programming and Scripting
Help with multiple for loops
Post 302887400 by pnara2 on Friday 7th of February 2014 09:56:19 AM
02-07-2014
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LEARN ABOUT CENTOS
nss-myhostname
NSS-MYHOSTNAME(8) nss-myhostname NSS-MYHOSTNAME(8) NAME
nss-myhostname - Provide hostname resolution for the locally configured system hostname. SYNOPSIS
nss-myhostname.la DESCRIPTION
nss-myhostname is a plugin for the GNU Name Service Switch (NSS) functionality of the GNU C Library (glibc) providing hostname resolution for the locally configured system hostname as returned by gethostname(2). Various software relies on an always-resolvable local hostname. When using dynamic hostnames, this is usually achieved by patching /etc/hosts at the same time as changing the host name. This however is not ideal since it requires a writable /etc file system and is fragile because the file might be edited by the administrator at the same time. nss-myhostname simply returns all locally configured public IP addresses, or, if none are configured, the IPv4 address 127.0.0.2 (which is on the local loopback) and the IPv6 address ::1 (which is the local host) for whatever system hostname is configured locally. Patching /etc/hosts is thus no longer necessary. To activate the NSS modules, myhostname has to be added to the line starting with "hosts:" in /etc/nsswitch.conf It is recommended to put myhostname last in the nsswitch.conf line to make sure that this mapping is only used as fallback, and any DNS or /etc/hosts based mapping takes precedence. EXAMPLE
# /etc/nsswitch.conf passwd: compat group: compat shadow: compat hosts: files dns myhostname networks: files protocols: db files services: db files ethers: db files rpc: db files netgroup: nis To test, use glibc's getent tool: $ 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 In this case the local hostname is omega. SEE ALSO
systemd(1), systemd-logind.service(8), logind.conf(5), loginctl(1), pam.conf(5), pam.d(5), pam(8), pam_loginuid(8) systemd 208 NSS-MYHOSTNAME(8)