linux上的nscd網域名稱快取服務
基本命令：
nano /etc/nscd.conf 配置檔案
/etc/init.d/nscd restart 啟動
nscd -g 顯示nscd的工作的統計資訊
cachename 可以為hosts/groups/passwd
positive-time-to-live cachename value：是成功的查詢在指定的cache中的快取時間，這個值是以秒為單位。這個值應該調到盡量調小。
negative-time-to-live cachename value：是不成功的查詢在指定的cache中的快取時間，這個值是以秒為單位。這個值也應該調到盡量的小。
keep-hot-count cachename value：是在指定cache中當前的快取的條目數。一般地，快取內的條目數應接近24小時內經常訪問到的條目數量。
check-files hosts yes // 此項應該為對修改的檔案進行檢查，修改後就會馬上反應出變化
如：enable-cache hosts yes
positive-time-to-live hosts 21600 //6小時
negative-time-to-live hosts 20
keep-hot-count hosts 80 //經常請求站點數
check-files hosts yes
------------------------ # nscd -g
nscd configuration:
0 server debug level
1m 47s server runtime
11 current number of threads
32 maximum number of threads
7 number of times clients had to wait
no paranoia mode enabled
3600 restart internal
passwd cache:
yes cache is enabled
no cache is persistent
no cache is shared
211 suggested size
216064 total data pool size
376 used data pool size
600 seconds time to live for positive entries
20 seconds time to live for negative entries
55 cache hits on positive entries
0 cache hits on negative entries
2 cache misses on positive entries
0 cache misses on negative entries
96% cache hit rate
4 current number of cached values
4 maximum number of cached values
1 maximum chain length searched
0 number of delays on rdlock
0 number of delays on wrlock
0 memory allocations failed
yes check /etc/passwd for changes
group cache:
yes cache is enabled
no cache is persistent
no cache is shared
211 suggested size
216064 total data pool size
216 used data pool size
3600 seconds time to live for positive entries
60 seconds time to live for negative entries
7 cache hits on positive entries
0 cache hits on negative entries
2 cache misses on positive entries
0 cache misses on negative entries
77% cache hit rate
3 current number of cached values
3 maximum number of cached values
1 maximum chain length searched
0 number of delays on rdlock
0 number of delays on wrlock
0 memory allocations failed
yes check /etc/group for changes
hosts cache:
yes cache is enabled
no cache is persistent
no cache is shared
8000 suggested size
8192000 total data pool size
39368 used data pool size
21600 seconds time to live for positive entries
20 seconds time to live for negative entries
19 cache hits on positive entries
0 cache hits on negative entries
317 cache misses on positive entries
0 cache misses on negative entries
5% cache hit rate
306 current number of cached values
312 maximum number of cached values
1 maximum chain length searched
0 number of delays on rdlock
0 number of delays on wrlock
0 memory allocations failed
yes check /etc/hosts for changes
services cache:
no cache is enabled
no cache is persistent
no cache is shared
0 suggested size
0 total data pool size
0 used data pool size
28800 seconds time to live for positive entries
20 seconds time to live for negative entries
0 cache hits on positive entries
0 cache hits on negative entries
0 cache misses on positive entries
0 cache misses on negative entries
0% cache hit rate
0 current number of cached values
0 maximum number of cached values
0 maximum chain length searched
0 number of delays on rdlock
0 number of delays on wrlock
0 memory allocations failed
yes check /etc/services for changes
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