ntpdateã§ã®ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸ (2009/09/15)
カテゴリー: OSã«ã¤ã„ã¦
投稿者: shinichi
先月ã€ã‚µãƒ¼ãƒãƒ¼ã®æ™‚刻è¨å®šã‚’行ã†ä½œæ¥ã‚’行ã„ã€æ‰‹å‹•ã§æ™‚刻サーãƒãƒ¼ã¨åŒæœŸã‚’å–ã‚‹æ‰‹é †ã‚’å…¥ã‚Œã¦ã„ãŸã€‚
本番サーãƒãƒ¼ã§ã®ä½œæ¥ã¯ä½œæ¥æ‰‹é †æ›¸ã‚’書ã„ã¦ã€ã‚ªãƒšãƒ¬ãƒ¼ã‚¿ãƒ¼ã«å¼•ãç¶™ã„ã§è¡Œã‚ãªã‘れã°ãªã‚‰ãªã„ã®ã§ã€æ™‚åˆ»èª¿æ•´ã®æ‰€ã§ä¸‹è¨˜ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸ã‚’確èªã™ã‚‹ã‚ˆã†ã«æ‰‹é †ã‚’書ã„ãŸã€‚
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DD MMM hh:mm:ss ntpdate[xxxxx]: step time server 123.456.789.098 offset -xx.xxxxxx sec
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実際ã«ä½œæ¥ã‚’ãŠé¡˜ã„ã—ãŸã‚‰ntpdateコマンドを実行ã—ãŸã¨ã“ã‚ã§å•ã„åˆã‚ã›ã®é›»è©±ãŒé³´ã£ãŸã€‚
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DD MMM hh:mm:ss ntpdate[xxxxx]: step time server 123.456.789.098 offset -xx.xxxxxx sec
"
ã§ã¯ãªã
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DD MMM hh:mm:ss ntpdate[xxxxx]: adjust time server 123.456.789.098 offset -xx.xxxxxx sec
"
ã ã‘れã©ã‚‚æ£å¸¸ã«ä½œæ¥ãŒå‡ºæ¥ã¦ã„ã‚‹ã®ã‹ï¼Ÿã¨ã€‚
"step"ã‹"adjust"ã‹ã®é•ã„ãªã®ã§å¤§ä¸ˆå¤«ã§ã™ã¨ç”ãˆãŸå¾Œã«ã‚½ãƒ¼ã‚¹ã‚’調ã¹ã¦ã¿ãŸã€‚
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調整幅ãŒ0.5秒未満ã®å ´åˆã«ã¯ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸"adjust time server・・・"ãŒã€0.5秒以上ã®å ´åˆã«ã¯ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸"step time server・・・"ãŒè¡¨ç¤ºã•れã¾ã™ã€‚
"
[root@TESTSERVER root]# ntpdate -q 123.456.789.098
server 123.456.789.098, stratum 2, offset -0.000586, delay 0.02568
15 Sep 16:59:32 ntpdate[20923]: adjust time server 123.456.789.098 offset -0.000586 sec
[root@TESTSERVER root]# date
Tue Sep 15 16:59:36 JST 2009
[root@TESTSERVER root]# date 09151700
Tue Sep 15 17:00:00 JST 2009
[root@TESTSERVER root]# ntpdate -q 123.456.789.098
server 123.456.789.098, stratum 2, offset -15.117865, delay 0.02570
15 Sep 17:00:04 ntpdate[20926]: step time server 123.456.789.098 offset -15.117865 sec
[root@TESTSERVER root]# ntpdate 123.456.789.098
15 Sep 16:59:55 ntpdate[20927]: step time server 123.456.789.098 offset -15.117872 sec
[root@TESTSERVER root]# ntpdate -q 123.456.789.098
server 203.214.181.109, stratum 2, offset -0.000139, delay 0.02568
15 Sep 17:01:32 ntpdate[20932]: adjust time server 123.456.789.098 offset -0.000139 sec
[root@TESTSERVER root]# ntpdate 123.456.789.098
15 Sep 17:01:32 ntpdate[20932]: adjust time server 123.456.789.098 offset -0.000139 sec
"
上記ã®ã‚ˆã†ã«ã€-qオプションをã¤ã‘ãŸã¨ãã«ã‚‚stepã‹adjustã‹ã‚’確èªã™ã‚‹ã“ã¨ãŒå‡ºæ¥ã¾ã™ã€‚
勉強ã«ãªã‚Šã¾ã—ãŸã€‚
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本番サーãƒãƒ¼ã§ã®ä½œæ¥ã¯ä½œæ¥æ‰‹é †æ›¸ã‚’書ã„ã¦ã€ã‚ªãƒšãƒ¬ãƒ¼ã‚¿ãƒ¼ã«å¼•ãç¶™ã„ã§è¡Œã‚ãªã‘れã°ãªã‚‰ãªã„ã®ã§ã€æ™‚åˆ»èª¿æ•´ã®æ‰€ã§ä¸‹è¨˜ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸ã‚’確èªã™ã‚‹ã‚ˆã†ã«æ‰‹é †ã‚’書ã„ãŸã€‚
"
DD MMM hh:mm:ss ntpdate[xxxxx]: step time server 123.456.789.098 offset -xx.xxxxxx sec
"
実際ã«ä½œæ¥ã‚’ãŠé¡˜ã„ã—ãŸã‚‰ntpdateコマンドを実行ã—ãŸã¨ã“ã‚ã§å•ã„åˆã‚ã›ã®é›»è©±ãŒé³´ã£ãŸã€‚
"
DD MMM hh:mm:ss ntpdate[xxxxx]: step time server 123.456.789.098 offset -xx.xxxxxx sec
"
ã§ã¯ãªã
"
DD MMM hh:mm:ss ntpdate[xxxxx]: adjust time server 123.456.789.098 offset -xx.xxxxxx sec
"
ã ã‘れã©ã‚‚æ£å¸¸ã«ä½œæ¥ãŒå‡ºæ¥ã¦ã„ã‚‹ã®ã‹ï¼Ÿã¨ã€‚
"step"ã‹"adjust"ã‹ã®é•ã„ãªã®ã§å¤§ä¸ˆå¤«ã§ã™ã¨ç”ãˆãŸå¾Œã«ã‚½ãƒ¼ã‚¹ã‚’調ã¹ã¦ã¿ãŸã€‚
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ntpdate.h(64)
#define NTPDATE_THRESHOLD (FP_SECOND >> 1) /* 1/2 second */
ntpdate.c(1295)
if (always_step) {
dostep = 1;
} else if (never_step) {
dostep = 0;
} else {
absoffset = server->soffset;
if (absoffset < 0)
absoffset = -absoffset;
dostep = (absoffset >= NTPDATE_THRESHOLD || absoffset < 0);
}
if (dostep) {
if (simple_query || l_step_systime(&server->offset)) {
msyslog(LOG_NOTICE, "step time server %s offset %s sec",
stoa(&server->srcadr),
lfptoa(&server->offset, 6));
}
} else {
#if !defined SYS_WINNT && !defined SYS_CYGWIN32
if (simple_query || l_adj_systime(&server->offset)) {
msyslog(LOG_NOTICE, "adjust time server %s offset %s sec",
stoa(&server->srcadr),
lfptoa(&server->offset, 6));
}
調整幅ãŒ0.5秒未満ã®å ´åˆã«ã¯ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸"adjust time server・・・"ãŒã€0.5秒以上ã®å ´åˆã«ã¯ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸"step time server・・・"ãŒè¡¨ç¤ºã•れã¾ã™ã€‚
"
[root@TESTSERVER root]# ntpdate -q 123.456.789.098
server 123.456.789.098, stratum 2, offset -0.000586, delay 0.02568
15 Sep 16:59:32 ntpdate[20923]: adjust time server 123.456.789.098 offset -0.000586 sec
[root@TESTSERVER root]# date
Tue Sep 15 16:59:36 JST 2009
[root@TESTSERVER root]# date 09151700
Tue Sep 15 17:00:00 JST 2009
[root@TESTSERVER root]# ntpdate -q 123.456.789.098
server 123.456.789.098, stratum 2, offset -15.117865, delay 0.02570
15 Sep 17:00:04 ntpdate[20926]: step time server 123.456.789.098 offset -15.117865 sec
[root@TESTSERVER root]# ntpdate 123.456.789.098
15 Sep 16:59:55 ntpdate[20927]: step time server 123.456.789.098 offset -15.117872 sec
[root@TESTSERVER root]# ntpdate -q 123.456.789.098
server 203.214.181.109, stratum 2, offset -0.000139, delay 0.02568
15 Sep 17:01:32 ntpdate[20932]: adjust time server 123.456.789.098 offset -0.000139 sec
[root@TESTSERVER root]# ntpdate 123.456.789.098
15 Sep 17:01:32 ntpdate[20932]: adjust time server 123.456.789.098 offset -0.000139 sec
"
上記ã®ã‚ˆã†ã«ã€-qオプションをã¤ã‘ãŸã¨ãã«ã‚‚stepã‹adjustã‹ã‚’確èªã™ã‚‹ã“ã¨ãŒå‡ºæ¥ã¾ã™ã€‚
勉強ã«ãªã‚Šã¾ã—ãŸã€‚
RHEL3/4ã§ç¢ºèªï¼ˆã‚½ãƒ¼ã‚¹ã¯RHEL5ã®ç‰©ï¼‰