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| A description of the '''Name Service Switch''' ('''NSS''') file (`/etc/nsswitch.conf`). For more details, see `nsswitch.conf(5)`. | The '''Name Service Switch configuration file''' (or '''`nsswitch.conf(5)`'''), typically found at `/etc/nsswitch.conf`, declares how domain names should be translated into [[Protocols/IP|IP addresses]]. |
NsSwitch.Conf
The Name Service Switch configuration file (or nsswitch.conf(5)), typically found at /etc/nsswitch.conf, declares how domain names should be translated into IP addresses.
Contents
Example
The defaults, which would be observed if /etc/nsswitch.conf were missing, are:
group compat group_compat nis hosts files dns networks files passwd compat passwd_compat nis shells files services compat services_compat nis rpc files proto files netgroup files
Syntax
Databases
The first column (delimited by spaces) indicates a database, while every subsequent column is a source or criteria.
Criteria
Criteria are structured as [STATUS=ACTION] or [!STATUS=ACTION].
A status can be any of...
success meaning 'no error'.
notfound meaning 'error in lookup'.
unavail indicates a connection couldn't be made.
tryagain indicates 'temporarily unavailability', as with locked connections.
An action is one of...
return meaning 'return the result'
continue meaning 'try the next item'
The implicit default is that a source only results in a return action given a success status. Anything else will result in a continue.