Linux system DNS Caching service NSCD

As we all know, Linux itself is not with the DNS cache.

You can install NSCD to turn on the Linux system DNS cache.

1. Installation:

Yum-y Install NSCD

2. Modify the configuration file:

Vim/etc/nscd.conf

Logfile/var/log/nscd.log

Threads 4

Max-threads 32

Server-user NSCD

Debug-level 0

Reload-count 5

Paranoia No

Restart-interval 3600

Enable-cache hosts Yes

Positive-time-to-live hosts 3600

Negative-time-to-live hosts 20

Suggested-size hosts 211

Check-files hosts Yes

Persistent hosts Yes

Shared hosts Yes

Max-db-size hosts 33554432

3. Restart the NSCD service.

/ETC/INIT.D/NSCD restart

NSCD Cache Three Services passwd group hosts, so it will record three libraries, corresponding to the source/etc/passwd,/etc/hosts and/etc/resolv.conf each library to save two copies of the cache, one is to find records, one is not found records. Each cache is saved with a time-to-Live (TTL).

Turn on, stop, restart the service

Sevices NSCD Start | Stop | Restart

Cache db file under/VAR/DB/NSCD

Nscd-g Viewing statistics

Clear Cache

Nscd-i passwd

Nscd-i Group

Nscd-i hosts

Add: Turn on the NSCD cache service to speed up DNS resolution

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Linux system DNS Caching service NSCD