[B! file] yassã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

yass id:yass

fileã«é–¢ã™ã‚‹yassã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (24)

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Zip - How not to design a file format.
The Zip file format is now 32 years old. You'd think being 32 years old the format would be well documented. Unfortunately it's not. I have a feeling this is like many file formats. They aren't designed, rather the developer just makes it up as they go. If it gets popular other people want to read and/or write them. They either try to reverse engineer the format OR they ask for specs. Even if the
yass 2021/08/02
zip

file
ãƒªãƒ³ã‚¯
ãƒ•ã‚¡ã‚¤ãƒ«ã«æ›¸ãã“ã¿ã‚’è¡Œã£ãŸã‚‰ã‹ãªã‚‰ãš fsync ã—ã‚ˆã† - ã«ã‚‡ãã«ã‚‡ããƒ–ãƒã‚°
é€šå¸¸ã€ãªã‚“ã®è€ƒãˆã‚‚ç„¡ã—ã«ãƒ—ãƒã‚°ãƒ©ãƒ ãŒãƒ•ã‚¡ã‚¤ãƒ«ã«æ›¸ãã“ã¿ã‚’è¡Œã£ãŸå¾Œã€é‹æ‚ªãã‚·ã‚¹ãƒ†ãƒ ãŒã‚¯ãƒ©ãƒƒã‚·ãƒ¥ã™ã‚‹ã¨ãƒ•ã‚¡ã‚¤ãƒ«ãŒå¤±ã‚ã‚Œã‚‹å¯èƒ½æ€§ãŒã‚ã‚‹ã€‚é€šå¸¸ã®ãƒ•ã‚¡ã‚¤ãƒ«æ›¸ãè¾¼ã¿ã¯ãƒ•ã‚¡ã‚¤ãƒ«ã«æ›¸ãè¾¼ã‚“ã§ã„ã‚‹ã‚ˆã†ã«è¦‹ãˆã¦å®Ÿã¯ãƒãƒƒãƒ•ã‚¡ãŒãƒ¡ãƒ¢ãƒªä¸Šã«è“„ãˆã¦ã„ã‚‹ã ã‘ã ã‹ã‚‰ã ã€‚ã“ã®ãƒ¡ãƒ¢ãƒªä¸Šã«è“„ãˆã‚‰ã‚ŒãŸã€ã„ãšã‚Œã‚¹ãƒˆãƒ¬ãƒ¼ã‚¸ã«æ›¸ãè¾¼ã‚€ãƒ‡ãƒ¼ã‚¿ã®ã“ã¨ã‚’ãƒ€ãƒ¼ãƒ†ã‚£ãƒšãƒ¼ã‚¸ã¨è¨€ã†ã€‚ä½•ã‚‚ã—ãªãã¦ã‚‚ãƒ€ãƒ¼ãƒ†ã‚£ãƒšãƒ¼ã‚¸ã«æ›¸ãã“ã¾ã‚ŒãŸãƒ‡ãƒ¼ã‚¿ã¯ã‚«ãƒ¼ãƒãƒ«ãŒå®šæœŸçš„ã«ã‚¹ãƒˆãƒ¬ãƒ¼ã‚¸ã«æ›¸ãè¾¼ã‚€ã®ã ãŒã€è‹¥å¹²ã®ã‚¿ã‚¤ãƒ ãƒ©ã‚°ãŒã‚ã‚‹ã€‚ã“ã®é–“ã«ã‚¯ãƒ©ãƒƒã‚·ãƒ¥ã™ã‚‹ã¨ãƒ‡ãƒ¼ã‚¿ãŒå¤±ã‚ã‚Œã‚‹ã‚ã‘ã ã€‚ãƒ‡ãƒ¼ã‚¿ãŒæ›¸ãè¾¼ã‚“ã ç›´å¾Œã€ã™ãã‚¹ãƒˆãƒ¬ãƒ¼ã‚¸ã«æ›¸ãå‡ºã—ãŸã„å ´åˆã¯ fsync ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã‚’å‘¼ã¶å¿…è¦ãŒã‚ã‚‹ã€‚ C ã‚„ C++ ã¨ã„ã£ãŸä½Žãƒ¬ã‚¤ãƒ¤ãƒ¼ã‚’æ‰±ã†è¨€èªžãªã‚‰ fsync ã‚’å‘¼ã¶ã ã‘ã§è‰¯ã„ãŒã€Java ã®ã‚ˆã†ãªé«˜ç´šè¨€èªžã§ã©ã†ã‚„ã£ã¦ fsync ã‚’ç™ºå‹•ã•ã›ã‚Œã°ã‚ˆã„ã‹ã€‚ é€šå¸¸ã®ãƒ•ã‚¡ã‚¤ãƒ«æ›¸ãè¾¼ã¿ ä¸‹è¨˜ã®ã‚ˆã†ãªä¸€èˆ¬çš„
yass 2014/12/25
fsync

java

file

kernel
ãƒªãƒ³ã‚¯
google/jimfs Â· GitHub - An in-memory file system for Java 7+
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yass 2014/09/07
java

google

file

filesystem
ãƒªãƒ³ã‚¯
mkasa/ffton Â· GitHub - Fast File Transfer over NAT
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yass 2014/08/11
" ffton works much better than scp particularly when the bandwidth is wide and the network latency is high. TCP does not work well with wider bandwidth and higher latency, so ffton uses UDP instead of TCP. "

udp

network

file

scp
ãƒªãƒ³ã‚¯
Overwriting is much faster than appending
Writing small volume of data (Bytes-MBs) with sync (fsync()/fdatasync()/O_SYNC/O_DSYNC) is very common for RDBMS and is needed to guarantee durability. For transactional log files, sync happens per commit. For data files, sync happens at checkpoint etc. Typically RDBMS does syncing data very frequently. In this case, overwriting is much faster than appending for most filesystems/storages. Overwrit
yass 2014/06/29
file

io

fsync
ãƒªãƒ³ã‚¯
GitHub - mfisk/filemap: File-Based Map-Reduce. Zero-install: easily use any collection of computers as a map-reduce cluster for command-line analytics.
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yass 2014/05/30
MapReduce

hadoop

file
ãƒªãƒ³ã‚¯
ezcdb::cdb.5
yass 2014/04/19
" A record is located according to an open-addressing hash scheme "

cdb

formart

file

open addressing hash

embedded
ãƒªãƒ³ã‚¯
Why buffered writes are sometimes stalled
Many people think buffered write (write()/pwrite()) is fast because it does not do disk access. But this is not always true. Buffered write sometimes does disk access by itself, or waits for some disk accesses by other threads. Here are three common cases where write() takes longer time (== causing stalls). 1. Read Modify Write Suppose the following logic. Opening aaa.dat without O_DIRECT/O_SYNC,
yass 2014/03/11
"Â 1. write() does disk read when needed. To avoid this issue you need to append a file, not overwrite. Or use OS page aligned writes. Â Â 2. write() may be blocked for "stable page writes". To avoid this issue you need to use newer Linux kernel supporting disabling stable page writes. "

file

write

filesystem

ext3

xfs

alignment

fsync
ãƒªãƒ³ã‚¯
The Design of A Big, Fast, and Persistent Queue - Abstraction Builder
yass 2013/10/19
" Suppose the average message size is 1KB, then big queue can concurrently producing and consuming 166K message per second on a commodity machine / the throughput is only limited by disk IO bandwidth. / automatic paging & swapping algorithm, only most-recently accessed data is kept in memory. "

queue

mmap

io

file

cache

LRU
ãƒªãƒ³ã‚¯
ãã®ãƒ•ã‚¡ã‚¤ãƒ«ã€å®‰å…¨ã«æ›´æ–°ã§ãã¦ã„ã¾ã™ã‹ï¼Ÿï¼ˆã‚¢ãƒˆãƒŸãƒƒã‚¯ãªãƒ•ã‚¡ã‚¤ãƒ«æ“ä½œï¼šå‰ç·¨ï¼‰
ãƒãƒ¼ãƒˆãƒ“ãƒ¼ãƒ„æœ€å¹´é•·ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ã®æ»æ¾¤ã§ã™ã€‚ä»¥å‰ã€å¼Šç¤¾CTOã«ã‚·ãƒ‹ã‚¢ãŠã£ã•ã‚“ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ã‹ã‚‰è‹¥æ‰‹ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ã«å‘ã‘ã¦ä½•ã‹æ›¸ã„ã¦ãã‚Œã¨è¨€ã‚ã‚ŒãŸæ°—ãŒã—ãŸã®ã§ã€ã‚¢ãƒˆãƒŸãƒƒã‚¯ï¼ˆatomicï¼‰ãªãƒ•ã‚¡ã‚¤ãƒ«æ“ä½œã«ã¤ã„ã¦3ç·¨ã«åˆ†ã‘ã¦ç´¹ä»‹ã—ã¾ã™ã€‚ã“ã®å†…å®¹ã¯å¼Šç¤¾ã®ç¤¾å†…å‹‰å¼·ä¼šã§è©±ã—ãŸå†…å®¹ã‚’ã¾ã¨ã‚ç›´ã—ãŸã‚‚ã®ã§ã™ã€‚ ãã®ãƒ•ã‚¡ã‚¤ãƒ«ã€å®‰å…¨ã«æ›´æ–°ã§ãã¦ã„ã¾ã™ã‹ï¼Ÿï¼ˆã‚¢ãƒˆãƒŸãƒƒã‚¯ãªãƒ•ã‚¡ã‚¤ãƒ«æ“ä½œï¼šå‰ç·¨ï¼‰â†ä»Šå›ž ãã®ãƒ•ã‚¡ã‚¤ãƒ«ã€å®‰å…¨ã«ä½œæˆã§ãã¦ã„ã¾ã™ã‹ï¼Ÿï¼ˆã‚¢ãƒˆãƒŸãƒƒã‚¯ãªãƒ•ã‚¡ã‚¤ãƒ«æ“ä½œï¼šä¸ç·¨ï¼‰ ãã®ãƒ•ã‚¡ã‚¤ãƒ«ã€å®‰å…¨ã«ãƒãƒƒã‚¯ã§ãã¦ã„ã¾ã™ã‹ï¼Ÿï¼ˆã‚¢ãƒˆãƒŸãƒƒã‚¯ãªãƒ•ã‚¡ã‚¤ãƒ«æ“ä½œï¼šå¾Œç·¨ï¼‰ ä»Šå›žã¯ã€Œã¿ãªã•ã‚“ã€å®‰å…¨ã«ãƒ•ã‚¡ã‚¤ãƒ«ã®æ›´æ–°ãŒã§ãã¦ã„ã¾ã™ã‹ï¼Ÿã€ã¨ã„ã†ã“ã¨ã«ã¤ã„ã¦ã€è€ƒãˆã¦ã¿ã¾ã—ã‚‡ã†ã€‚ ã‚ãªãŸã¯ã‚ã‚‹ã‚µãƒ¼ãƒä¸Šã®ãƒ•ã‚¡ã‚¤ãƒ«ã®æ›´æ–°ã‚’ä¾é ¼ã•ã‚Œã€ã‚‚ã‚‰ã£ãŸãƒ•ã‚¡ã‚¤ãƒ«ã‚’ã‚µãƒ¼ãƒä¸Šã§ã‚³ãƒ”ãƒ¼ã—ã¦ä¸Šæ›¸ãã—ã¾ã—ãŸã€‚ã—ã°ã‚‰ãã—ã¦ã€ãƒ‡ãƒ¼ã‚¿ã«ç•°å¸¸ãŒç™ºç”Ÿã—ãŸã®ã§èª¿ã¹ã¦æ¬²ã—ã„ã¨è¨€ã‚ã‚Œã¾ã—ãŸã€‚ã•ã¦ã€ä½•ãŒèµ·ã
yass 2013/10/10
" ã‚¢ãƒˆãƒŸãƒƒã‚¯ã«ãƒ•ã‚¡ã‚¤ãƒ«ã‚’æ›´æ–°ã™ã‚‹ã«ã¯ã€rename()ã¨ã„ã†ãƒ•ã‚¡ã‚¤ãƒ«åã‚’å¤‰æ›´ã™ã‚‹ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã‚’ä½¿ã„ã¾ã™ã€‚mvã‚³ãƒžãƒ³ãƒ‰ã¯ã“ã®rename()ã‚’ä½¿ã£ã¦ãƒ•ã‚¡ã‚¤ãƒ«åã®å¤‰æ›´ã‚’è¡Œã£ã¦ã„ã¾ã™ã€‚"

filesystem

file

linux

atomic

mv

inode
ãƒªãƒ³ã‚¯
Cloudera Blog
yass 2013/09/23
hadoop

SequenceFile

format

bloom filter

file
ãƒªãƒ³ã‚¯
linux local system locks
yass 2013/05/05
file

lock

linux

lslock
ãƒªãƒ³ã‚¯
è¶…é«˜é€Ÿãƒ•ã‚¡ã‚¤ãƒ«æ¤œç´¢ã‚½ãƒ•ãƒˆã€ŒEverythingã€ãŒãƒãƒ¼ã‚¸ãƒ§ãƒ³ã‚¢ãƒƒãƒ—ï¼ä½¿ã„æ–¹ã‚„æ—¥æœ¬èªžåŒ–æ–¹æ³•ã‚’ã¾ã¨ã‚ã¦ã¿ãŸã‚ˆã€‚ - enjoypclife.net
ã€ŒEverythingã€æ–°ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã¯ã•ã‚‰ã«ä¾¿åˆ©ã«ä½¿ã„ã‚„ã™ããªã£ãŸï¼ ã€ŒEverythingã€æ–°ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã¯ã€ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ãƒ‰ãƒ©ã‚¤ãƒ–ã®æ¤œç´¢ã«ã‚‚å¯¾å¿œã—ã€NASãªã©ã®ãƒ•ã‚¡ã‚¤ãƒ«æ¤œç´¢ã‚‚å®¹æ˜“ã«è¡Œãˆã‚‹ã‚ˆã†ã«é€²åŒ–ã—ã¦ã„ã¾ã™ã€‚ ã¨ã«ã‹ãã€1æ–‡å—å…¥åŠ›ã™ã‚‹ã”ã¨ã«ã©ã‚“ã©ã‚“æ¤œç´¢çµæžœãŒè¡¨ç¤ºã•ã‚Œã¦ã„ãé«˜é€Ÿæ€§ã¯ã€ä¸€åº¦å‘³ã‚ã†ã¨ã‚„ã‚ã‚‰ã‚Œãªã„ã¯ãšï¼ Windows 7ã¯å‹¿è«–ã®äº‹ã€Windows 8ã§ã‚‚ãã¡ã‚“ã¨å‹•ä½œã—ã¾ã™ã€‚ å€‹äººçš„ã«ã¯ã€å…¨ã‚¦ã‚£ãƒ³ãƒ‰ã‚¦ã‚ºãƒ¦ãƒ¼ã‚¶ãƒ¼å¿…æºã®ç´ æ™´ã‚‰ã—ã„ãƒ•ãƒªãƒ¼ã‚½ãƒ•ãƒˆã ã¨æ€ã„ã¾ã™ã€‚ Everythingã®ãƒ€ã‚¦ãƒ³ãƒãƒ¼ãƒ‰ Everythingã®ãƒ€ã‚¦ãƒ³ãƒãƒ¼ãƒ‰ã¯ã“ã¡ã‚‰ã‹ã‚‰ã€‚ Download Everything 1.3.0.632b Beta for Windowsã¨ã„ã†ã®ãŒã€æœ€æ–°ã®ãƒ™ãƒ¼ã‚¿ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã§ã™ã€‚ Everythingã®ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ«/è¨å®š/æ—¥æœ¬èªžåŒ– Everythingã®ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ«ã¯ç°¡å˜ãªã®ã§ã™ãŒã€æœ€åˆã ã‘
yass 2013/03/10
windows

search

file
ãƒªãƒ³ã‚¯
Trevni: A Column File Format
Version 0.1 DRAFT This document is the authoritative specification of a file format. Its intent is to permit compatible, independent implementations that read and/or write files in this format. IntroductionData sets are often described as a table composed of rows and columns. Each record in the dataset is considered a row, with each field of the record occupying a different column. Writing records
yass 2013/02/06
trevni

hadoop

data structure

file

file format
ãƒªãƒ³ã‚¯
ãƒ•ã‚¡ã‚¤ãƒ«å…¥å‡ºåŠ›ã®åŸºæœ¬ (IO ãƒ¢ãƒ‡ãƒ«) ã‚’å‹‰å¼·ã™ã‚‹ - ãƒ•ãƒªãƒ¼ãƒ•ã‚©ãƒ¼ãƒ ãƒ•ãƒªãƒ¼ã‚¯ã‚¢ã‚¦ãƒˆ
ç§»è»¢ã—ã¾ã—ãŸ http://please-sleep.cou929.nu/20121103.html
yass 2012/11/04
linux

kernel

io

file

async
ãƒªãƒ³ã‚¯
http://1978th.net/tech/promenade.cgi?id=80
yass 2010/07/06
database

file

directory

filesystem

hash
ãƒªãƒ³ã‚¯
RichCopyã§ãƒ•ã‚©ãƒ«ãƒ€ã‚’ãƒãƒƒã‚¯ã‚¢ãƒƒãƒ—ï¼åŒæœŸã•ã›ã‚‹ ï¼ ï¼ IT
ãƒ•ã‚¡ã‚¤ãƒ«ã®ãƒãƒƒã‚¯ã‚¢ãƒƒãƒ—ã§ã¯ã€2ã¤ã®ãƒ•ã‚©ãƒ«ãƒ€ã®å†…å®¹ã‚’åŒæœŸã•ã›ã‚‹ã‚³ãƒžãƒ³ãƒ‰ã‚’åˆ©ç”¨ã™ã‚‹ã¨ã‚ˆã„ã€‚RichCopyã¯ãƒ•ã‚©ãƒ«ãƒ€ã®åŒæœŸæ©Ÿèƒ½ã‚’GUIã§ç°¡å˜ã«è¨å®šã§ãã‚‹ã€‚ã‚¢ãƒ‰ãƒãƒ³ã‚¹ãƒˆãƒ»ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã‚’ä½¿ã†ã¨ã€ç‰¹å®šã®æ‹¡å¼µåã®ãƒ•ã‚¡ã‚¤ãƒ«ã®ã¿ã‚³ãƒ”ãƒ¼ã™ã‚‹ãªã©ãŒå¯èƒ½ã ã€‚ è§£èª¬ ã‚µãƒ¼ãƒã®ãƒãƒƒã‚¯ã‚¢ãƒƒãƒ—ã‚„ãƒã‚°ã®ä¿å˜ã€å€‹äººçš„ãªãƒ‡ãƒ¼ã‚¿ã®ãƒãƒƒã‚¯ã‚¢ãƒƒãƒ—ã€ãƒªãƒ¢ãƒ¼ãƒˆãƒ»ã‚ªãƒ•ã‚£ã‚¹åŒå£«ã§ã®ãƒ‡ãƒ¼ã‚¿ã®åŒæœŸãªã©ã€2ã¤ã®ãƒ•ã‚©ãƒ«ãƒ€ã§ãƒ•ã‚¡ã‚¤ãƒ«ã®å†…å®¹ãªã©ã‚’åŒã˜çŠ¶æ…‹ã«ä¿ã¤æ“ä½œã¯ã€ã‚·ã‚¹ãƒ†ãƒ ç®¡ç†ã®ã•ã¾ã–ã¾ãªå ´é¢ã§å¿…è¦ã«ãªã‚‹ã€‚æœ¬TIPSã§ã‚‚ã€ã€Œxcopyã§ãƒ•ã‚¡ã‚¤ãƒ«ã‚’ãƒãƒƒã‚¯ã‚¢ãƒƒãƒ—ã™ã‚‹ã€ã€ŒSyncToyãƒ„ãƒ¼ãƒ«ã§æ‰‹è»½ã«ãƒãƒƒã‚¯ã‚¢ãƒƒãƒ—ã‚’è¡Œã†ã€ã€Œrobocopyã§ãƒ•ã‚©ãƒ«ãƒ€ã‚’ãƒãƒƒã‚¯ã‚¢ãƒƒãƒ—ï¼åŒæœŸã•ã›ã‚‹ã€ã¨ã„ã£ãŸã•ã¾ã–ã¾ãªæ‰‹æ³•ã‚’ç´¹ä»‹ã—ã¦ããŸã€‚ ç‰¹ã«robocopyã¯ã€ã‚‚ã¨ã‚‚ã¨ã¯ãƒªãƒ¢ãƒ¼ãƒˆã®ãƒ•ã‚¡ã‚¤ãƒ«ãƒ»ã‚µãƒ¼ãƒåŒå£«ã§ãƒ•ã‚©ãƒ«ãƒ€ã‚’åŒæœŸã•ã›ã‚‹ãŸã‚ã«ä½œã‚‰ã‚ŒãŸã‚³ãƒžãƒ³ãƒ‰ã¨ã„ã†ã“ã¨ã‚‚ã‚ã‚Šã€ä½¿ã„å‹æ‰‹ãŒã‚ˆã„ã‚‚ã®ã¨
yass 2009/04/19
windows

tool

backup

sync

file

directory
ãƒªãƒ³ã‚¯
fsniper - Trac
yass 2008/09/25
fsniper is a utility that waits for a file to be changed or created, and then executes a command on that file.

file

directory

monitoring
ãƒªãƒ³ã‚¯
mmap (ãƒ¡ãƒ¢ãƒªãƒžãƒƒãƒ—ãƒˆãƒ•ã‚¡ã‚¤ãƒ«) : kei@sodan
Linux/Unixã®ãƒ¡ãƒ¢ãƒªå‘¨ã‚Šã§å¤§æ´»èºã®ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã€mmapã®è§£èª¬ã§ã™ã€‚ ã‚¹ãƒ©ã‚¤ãƒ‰(pdf), (pptx), (ppt) ä¸Šè¨˜ã‚¹ãƒ©ã‚¤ãƒ‰åŠã³ã“ã®ãƒšãƒ¼ã‚¸ã®å†…å®¹ã®å¤§éƒ¨åˆ†ã¯ã€(åƒ•ãŒå—ã‘ãŸ) ç”°æµ¦å…ˆç”Ÿ ã®æŽˆæ¥ã‚ªãƒšãƒ¬ãƒ¼ãƒ†ã‚£ãƒ³ã‚°ã‚·ã‚¹ãƒ†ãƒ ã®6å›žç›®ã®ã‚¹ãƒ©ã‚¤ãƒ‰ã¨åŒã˜ã§ã™ã€‚ ã‚ã¨ã€mallocä¸ã®mmap()ã¾ã‚ã‚Šã‚’èª¿ã¹ã¦ãã‚Œã¦ã‚ã‚ŠãŒã¨ã†>ç ”ç©¶å®¤ã®kennyãã‚“ ãƒ•ã‚¡ã‚¤ãƒ«ã¨ãƒ¡ãƒ¢ãƒª mmap()ã®APIãƒ»ä½¿ã„æ–¹ (mallocã®ä¸èº«ã®è©±é¡Œ) mmap()ã®å®Ÿè£…
yass 2008/06/26
linux

mmap

io

file

memory
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ãƒ¦ãƒ¼ã‚¶ãƒ¼ã”ã¨ã«ä½¿ç”¨ã§ãã‚‹ãƒªã‚½ãƒ¼ã‚¹åˆ¶é™ã‚’ã—ãŸã„
å¤§å‹¢ã®ãƒ¦ãƒ¼ã‚¶ãƒ¼ã‚’æŠ±ãˆã‚‹ã‚µãƒ¼ãƒã§ã¯ã€ã‚·ã‚¹ãƒ†ãƒ ãƒªã‚½ãƒ¼ã‚¹ãŒ1ãƒ¦ãƒ¼ã‚¶ãƒ¼ã«ã‚ˆã£ã¦å æœ‰ã•ã‚Œãªã„ã‚ˆã†ç®¡ç†ã™ã‚‹å¿…è¦ãŒã‚ã‚‹ã€‚PAMã‚’åˆ©ç”¨ã™ã‚‹ã¨ã€ãƒ¦ãƒ¼ã‚¶ãƒ¼ã”ã¨ã€ã‚°ãƒ«ãƒ¼ãƒ—ã”ã¨ã®åˆ¶é™ã‚’ã™ã‚‹ã“ã¨ãŒå¯èƒ½ã ã€‚ # vi /etc/security/limits.conf * soft nofile 1024 * hard nofile 49152 * - maxlogin 3 ä¸Šè¨˜ã®ä¾‹ã¯1è¡Œç›®ã§ã€ã™ã¹ã¦ã®ãƒ¦ãƒ¼ã‚¶ãƒ¼ã€Œ*ã€ã«ã‚½ãƒ•ãƒˆãƒªãƒŸãƒƒãƒˆã€Œsoftã€ã€ã§èªã¿è¾¼ã‚ã‚‹æœ€å¤§ãƒ•ã‚¡ã‚¤ãƒ«æ•°ã€Œnofileã€ã‚’1024ã€æœ€å¤§é™åº¦ã€Œhardã€ã§ã¯èªã¿è¾¼ã‚ã‚‹æœ€å¤§ãƒ•ã‚¡ã‚¤ãƒ«æ•°ã€Œnofileã€ã‚’49152ãƒ•ã‚¡ã‚¤ãƒ«ã«åˆ¶é™ã‚’æ„å‘³ã™ã‚‹ã€‚ æœ€å¾Œã®è¡Œã¯ã€ã™ã¹ã¦ã®ãƒ¦ãƒ¼ã‚¶ãƒ¼ã«ãŠã„ã¦åŒæ™‚ãƒã‚°ã‚¤ãƒ³æ•°ã‚’3ã«åˆ¶é™ã™ã‚‹è¨å®šã ã€‚ ã¾ãŸã€æ¬¡ã®ã‚ˆã†ãªè¡Œã‚’è¿½åŠ ã™ã‚‹ã¨ã€Œenterã€ã‚°ãƒ«ãƒ¼ãƒ—ã«å±žã™ã‚‹ãƒ¦ãƒ¼ã‚¶ãƒ¼ã«ã¤ã„ã¦ã€ã»ã‹ã®ãƒªã‚½ãƒ¼ã‚¹å±žæ€§ã‚’ä¸Žãˆã‚‹ã“ã¨ãŒã§ãã‚‹ã€‚
yass 2008/04/15
linux

security

file

open

filesystem
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