Interesting results for getservbyname() performance ( and possible changes for /etc/services)
Eric Harrison
eharrison at mail.mesd.k12.or.us
Thu Jan 12 17:29:12 UTC 2006
Lamont R. Peterson wrote:
> On Thursday 12 January 2006 09:52am, Paul A Houle wrote:
>
>>Nils Philippsen wrote:
>>
>>>nscd can't (or at least doesn't) take advantage of knowing about local
>>>file changes, it caches information for a certain time period and it
>>>doesn't seem to cache services, only passwd, group, hosts.
>>
>> How often do you update /etc/services?
>>
>> You can always clear the cache by kicking ncsd. If you're updating
>>/etc/services via an rpm, you can kick ncsd in the postinstall script.
>
>
> Actually, I found out differently just yesterday.
>
> I was working on an issue caused by SELinux policy relating to nscd when using
> TLS encrypted LDAP for authentication & user information. During my testing,
> I had to stop nscd and "rm /var/db/nscd/*" (which only has group, hosts &
> passwd) and then restart nscd, in order to clear the cache.
>
> Is there some mystery switch to do this that I'm missing?
>
mystery switch = -i
nscd -i passwd
nscd -i group
nscd -i hosts
# nscd --help
Usage: nscd [OPTION...]
Name Service Cache Daemon.
-d, --debug Do not fork and display messages on the
current
tty
-f, --config-file=NAME Read configuration data from NAME
-g, --statistic Print current configuration statistic
-i, --invalidate=TABLE Invalidate the specified cache
-K, --shutdown Shut the server down
-t, --nthreads=NUMBER Start NUMBER threads
-?, --help Give this help list
--usage Give a short usage message
-V, --version Print program version
-Eric
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