04-27-2008
What to change
Solaris provides extensive control over the means of looking up various name services including DNS. If DNS resolution of hostnames has not been setup, the nsswitch.conf file must be configured in addition to resolv.conf.
Once you have configured the DNS client settings in Solaris, you need to alter the /etc/nsswitch.conf file. This name services configuration file controls a variety of lookup types with several services including NIS/NIS+ and LDAP.
To configure your host to perform hostname lookups with DNS, modify the line that starts with hosts: to include the keyword dns. For example, if your /etc/nsswitch.conf file hosts line looks like:
hosts: files
change it to read:
hosts: files dns
The order of keywords on this line indicates the order in which Solaris references the name services. The keyword files represents the /etc/hosts file.
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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)