NSS
NSS-MYHOSTNAME
NAMESYNOPSIS
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NAME
nss-myhostname, libnss_myhostname.so.2 - 为æ¬å°éç½®çç³»ç»ä¸»æºåæä¾è§£æåè½
SYNOPSIS
libnss_myhostname.so.2
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nss-myhostname æ¯ä¸ä¸ª glibc(GNU C Library) NSS(Name Service Switch) æä»¶ï¼ æä¾äºè§£ææ¬å°éç½®çç³»ç»ä¸»æºåçåè½ã æè°"æ¬å°éç½®çç³»ç»ä¸»æºå"å¶å®å°±æ¯ gethostname(2) å½æ°çè¿åå¼ã 该模åç解æè§åå¦ä¸ï¼
• æ¬æºç主æºå å°ä¼è¢«è§£æ为æææ¬å°IPå°åï¼å¹¶æç§ä»ä»¬æå±ç scope æåºã å¦æ scope ä¸åå¨ï¼åä¼è¢«è§£æ为æ¬å°åç¯æ¥å£ä¸ç IPv4 127.0.0.2 以å IPv6 ::1
• "localhost" ä¸ "localhost.localdomain" 以åææ以 ".localhost" æ ".localhost.localdomain" ç»å°¾ç主æºåï¼ é½ä¼è¢«è§£æ为 127.0.0.1 ä¸ ::1
• "gateway" ä¼è¢« 解æ为å½åææçé»è®¤ç½å³å°åï¼ å¹¶æç§å°åçæ°å顺åºæåºã è¿æ ·å°±ä¸ºå½åç½å³åéäºä¸ä¸ªåºå®ç主æºåï¼ ä»èå¯ä»¥è®©åºç¨ç¨åºå¨ä¸å³å¿ç½ç»éç½®çæåµä¸ï¼ç´æ¥å¼ç¨ç½å³ã
许å¤è½¯ä»¶ä¾èµäºåå¨ä¸ä¸ªå¯ä»¥æ°¸è¿è¢«è§£æçæ¬å°ä¸»æºåã å½ä½¿ç¨å¨æ主æºåçæ¶åï¼ ä¼ ç»çåæ³æ¯å¨ä¸»æºååçååçåæ¶ä¿®æ¹ /etc/hosts æ件ã è¿ç§åæ³ç缺ç¹å¨äºè¦æ± /etc ç®å½å¿é¡»æ¯å¯åçï¼ èä¸æå¯è½å¨ä¿®æ¹ /etc/hosts æ件çåæ¶ï¼ ç³»ç»ç®¡çåä¹æ£å¨ç¼è¾å®ãå¯ç¨ nss-myhostname ä¹åï¼ å°±å¯ä»¥ä¸å¿ä¿®æ¹ /etc/hosts æ件ãæ´è¿ä¸æ¥ï¼ å¨è®¸å¤ç³»ç»ä¸çè³æ éå- å¨è¿ä¸ªæ件ã
è¦æ¿æ´»NSS模åï¼å¯å° "myhostname" æ·»å å° /etc/nsswitch.conf æ件ä¸ä»¥ "hosts:" å¼å¤´çè¡éé¢ã
å»ºè®®å° "myhostname" æ¾ç½®å¨ nsswitch.conf æ件ä¸ä»¥ "hosts:" å¼å¤´çè¡çæ«å°¾ï¼ä»¥ç¡®ä¿ä¼å使ç¨ä¼ ç»çåºäºDNSä¸ /etc/hosts æ件ç解ææ¹æ³ã
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ä¸é¢æ¯ä¸ä¸ªæ£ç¡®å¼å¯äº nss-myhostname æ件ç /etc/nsswitch.conf æ件çä¾åï¼
passwd: compat
mymachines
group: compat mymachines
shadow: compat
hosts: files
mymachines resolve myhostname
networks: files
protocols: db
files
services: db files
ethers: db files
rpc: db files
netgroup: nis
å¯ä»¥ä½¿ç¨ glibc 软件åä¸ç getent å·¥å·æ£æ¥éç½®çæææ§ï¼
$ getent ahosts
‘hostname‘
::1 STREAM omega
::1 DGRAM
::1 RAW
127.0.0.2 STREAM
127.0.0.2 DGRAM
127.0.0.2 RAW
æ¬ä¾ä¸çæ¬å°ä¸»æºåæ¯ omega
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systemd(1), nss-resolve(8), nss-mymachines(8), nsswitch.conf(5), getent(1)
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