Re: Clearing DNS cache without rebooting

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Tim via users writes:

Tim:
>> Previously, yours was:
>>
>> hosts:  files mdns4_minimal [NOTFOUND=return] dns myhostname
>>
>> Which first tries the hosts file, then mdns, then aborts if nothing
>> found (I believe, going by the comments in the rest of the file).  The

Sam Varshavchik:
> My read of nsswitch.conf's man page is that [NOTFOUND=return] applies to the
> previous resolver's query's results only.

The /etc/nsswitch.conf file suggests otherwise, it's far from clear:

# Example - obey only what nisplus tells us...
#services:   nisplus [NOTFOUND=return] files
#networks:   nisplus [NOTFOUND=return] files
#protocols:  nisplus [NOTFOUND=return] files
#rpc:        nisplus [NOTFOUND=return] files
#ethers:     nisplus [NOTFOUND=return] files
#netmasks:   nisplus [NOTFOUND=return] files

The "obey only" suggests files will not be consulted.  The behaviour of
Joe's computer seems to indicate that kind of thing, too.

Looking in the nsswitch.conf man file, I see:

The ACTION value can be one of:

return      Return a result now.  Do not call  any  further  lookup

It's not the "return", but "NOTFOUND" that's the key. The status values are described separately, elsewhere.

An mdns resolver should return either NOTFOUND or SUCCESS for .local lookups, and UNAVAIL for all other lookups.

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