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A description of the '''Name Service Switch''' ('''NSS''') file (`/etc/nsswitch.conf`). For more details, see `nsswitch.conf(5)`. |
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| The first column (delimited by spaces or tab characters) indicates a database, while every subsequent column is a source. Some common database sources are listed below. | The first column (delimited by spaces or tab characters) indicates a '''database''', while every subsequent column is a '''source'''. Some common database sources are listed below. |
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| For `hosts`... | For '''`hosts`'''... |
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nsswitch.conf
A description of the Name Service Switch (NSS) file (/etc/nsswitch.conf). For more details, see nsswitch.conf(5).
Contents
Example
passwd: compat group: compat shadow: compat hosts: dns [!UNAVAIL=return] files networks: nis [NOTFOUND=return] files ethers: nis [NOTFOUND=return] files protocols: nis [NOTFOUND=return] files rpc: nis [NOTFOUND=return] files services: nis [NOTFOUND=return] files
Syntax
Databases
The first column (delimited by spaces or tab characters) indicates a database, while every subsequent column is a source. Some common database sources are listed below.
For hosts...
files (i.e. /etc/hosts)
dns (i.e. run-time lookups based on /etc/resolv.conf)
myhostname (see nss-myhostname(8))
mymachine which connects to systemd-machined (see nss-mymachines(8))
resolve which connects to systemd-resolved (see nss-resolve(8))
Action Items
Action items follow one the following patterns: [STATUS=ACTION] and [!STATUS=ACTION].
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.
ACTION can be any of...
return meaning 'return the result'
continue meaning 'try the next item'
merge causes the system to try both the preceding and the following items, and
By default, only a success status results in a return action. Anything else will result in a continue. The exception is for a group lookup-a notfound status will lead to a continue action regardless of any action specified.