ãã¼ã¿ã»ã³ã¿ã«æ§ç¯ãã¦ããã·ã¹ãã ã§ã¯ããµã¼ãã¹ç¨ã®ã¤ã³ã¿ã¼ãããåç·ã¨ã¯å¥ã«ãé常ç¨ã»ã¡ã³ããã³ã¹ç¨ã®åç·ãå©ç¨ãããå ´åãããã¾ãããã®éã«åé¡ã¨ãªãã®ããã«ã¼ãã£ã³ã°ãã©ãããããã ã¨æãã¾ãã DefaultGWã¯å¤§æµã®å ´åããµã¼ãã¹ç¨åç·ã«ã¶ãä¸ãã£ã¦ããã«ã¼ã¿ãæãã¦ããã§ããããããã©ããã£ã¦é常æãããã¯ã¡ã³ããã³ã¹æã«çµè·¯ãåãæ¿ããããèããªããã°ããã¾ããã (1) ãªãããã®ã«ã¼ãã£ã³ã°ãããã³ã«ãå©ç¨ãã¦åãæ¿ããï¼ (2) ç¹å®ã®IPã¢ãã¬ã¹å®ã®ãã±ããã¯ã¡ã³ããã³ã¹åç·ãéãããã«çµè·¯ãè¨å®ããã (3)ã¡ã³ããã³ã¹åç·ã®IPã¢ãã¬ã¹ãçºä¿¡å ã®ãã±ããã¯ã¡ã³ããã³ã¹åç·ãçµç±ããçµè·¯è¨å®ãããã çãèããããã¨æãã¾ãã (1) ã¯ä½ã¨ãªãä¸ãã¦ã¿ãã®ã§ããããã¯ãå®éã®æ§ç¯ã¤ã¡ã¼ã¸ã沸ãã¾ãããå°ãªãã¨ããã¡ã¤ã³ã«ã¼ã¿ãæ éããå ´åã«çµè·¯ãåãå¤ããäºã¯ã§
2009/10/23 Linuxåãã®æ¬¡ä¸ä»£ãã¡ã¤ã«ã·ã¹ãã ã¨ãã¦æ³¨ç®ããã¦ãããBtrfsãï¼ãã¿ã¼ã»ã¨ãã¨ã¹ï¼ãæ±äº¬ã»ç§èåã§éå¬ä¸ã®The Linux Symposium 2009ã§10æ23æ¥ãBtrfsããã¸ã§ã¯ãã®åµå§è ã§éçºããªã¼ãããã¯ãªã¹ã»ã¡ã¤ã½ã³æ°ããBtrfsã§å®ç¾ããæ©è½ãç¾ç¶ã«ã¤ãã¦ç´¹ä»ããã Btrfsã¯2007å¹´ã«ãªã©ã¯ã«ãçºè¡¨ããæ°ãããã¡ã¤ã«ã·ã¹ãã ã ã2009å¹´1æã«ã«ã¼ãã«ã«åãè¾¼ã¾ãã¦ãã¦ããã§ã«ãã£ã¹ã¯ä¸ã®ãã©ã¼ãããã¯ãã£ãã¯ã¹ããã¦ãããã¨ãããã¢ã¼ãªã¢ããã¿ã¼å±¤ãªã©ã«ã¯ããã§ã«ååã«ä½¿ããã¬ãã«ãï¼ã¡ã¤ã½ã³æ°ï¼ã«ãªã£ã¦ããã¨ãããBtrfsã¯ãªã©ã¯ã«ãéçºãã¦ããã¨æãããã¡ã ããIBMãã¤ã³ãã«ãããã³ã¼ãã®è²¢ç®ããããä¾ãã°æ¬¡æãã¼ã¸ã§ã³ã«å«ã¾ããRAID 5/6/60ã«ã¯ã¤ã³ãã«ãåãçµãã§ããã¨ãããã¾ããSSDã¸ã®æé©åãé²ãã¦ãã
以åã®ããã°ã§æ¸ããGratuitous ARPãä»åã¯å ·ä½çãªéåºæ¹æ³ã«ã¤ãã¦æ¸ãã¦ã¿ãã Linuxã»ã»ã»send_arpã³ãã³ãã®å©ç¨ bonding ã Active-Backup ã§æ§æãã¦ããç¶æ³ã§ãããã¯ã¼ã¯ãªã³ã¯ãåæããã« ifenslave ã³ãã³ãããã¨ãã° # ifenslave -c bond0 eth1ã®ããã«ãã¦ãActive 㪠Slave ã¤ã³ã¿ã¼ãã§ã¤ã¹ãå¤æ´ããã¨ãå¤é¨ããã®ãã±ãããå±ããªããªããããã¯ã©ã¤ã³ãåãæ¿ãã£ããã¨ãæ¥ç¶ãã¦ããã¹ã¤ãããæ¤ç¥ããªããããè¦ã¯ãã¹ã¤ããã® FDB ï¼Forwarding Data Baseï¼ãæ´æ°ãããªããã©ã¤ã³ã®åæ¿ã bonding ã®æ©è½ã«å§ãã¦ããå ´åã¯ãåãæ¿ãã£ãã¿ã¤ãã³ã°ãããããªãã®ã§ããã®ç¶æ³ãåé¿ããæ段ã¯ãªãã¯ããä¸æ¹ã§ãèªèº«ã§ ping, arping ãªã©ã§ãããã¯ã¼ã¯ã®æ¥ç¶ç£è¦ã
è¨äº ID: 18964 - ä½ææ¥: 2009/09/14 4:32 - æçµæ´æ°æ¥: 2009/09/15 3:34 対象ãªãªã¼ã¹: Red Hat Enterprise Linux 3, 4, 5, åã³ Red Hat Enterprise MRG. â»RHEL3 ã«ã¤ãã¾ãã¦ã¯ãæ¬ iptables ã®ç·©åç対象å¤ã¨ãªãã¾ããRHEL3 ã§ã®ç·©åçã®æç¡ã«ã¤ãã¦ã¯ã ä»å¾ã¢ãããã¼ããããäºå®ã§ãã ã¢ãããã¼ã 2009/09/14: ç·©åçé ç®ã® iptables ã®ä¾ã«ã¤ãã¦åã«ã¼ã«ã®èª¬æã追å ããã¾ããã Problem TCP ã³ãã¯ã·ã§ã³ã®èå¼±æ§ã«ããã第ä¸è ã«ãã DOS æ»æã®åé¡ãåå¨ãã¾ãããã®åé¡ã¯æ¬èå¼±æ§ãç¨ããDOSæ»æã«ããããµã¼ãã¼ãªã½ã¼ã¹ãèããæ¶è²»ãããµã¼ãã¹ä¸è½ç¶æ ãå¼ãèµ·ãããããã®ã¨ãã¦ãCVE-2008-4609 ã«å ±åããã¦
Linuxã®ã«ã¼ãã«ããã®åå¼·ä¼ã§ãããã«ã¼ãã«èªæ¸ä¼ãã«åå ãã¦ãã¾ãããä»åã®ãé¡ã¯ãã¯ã¦ãªã§ã®ãã¼ãæ§è½ã®å¼åºãæ¹ãã§ããèªåã«ã¯ç解ãããã¦ãã¾ããããã¨ã¦ãèå³æ·±ã話ãè´ãã¾ããã以ä¸ãã¡ã¢ã®ã¾ã¨ãã§ãã ç°ä¸æ å¸ï¼id:stanakaï¼ããã®çºè¡¨ â¦ã¨ããã¤ã¤ãYAPC::Asiaã¨ã®ã¯ããã§ãæåã®30åããããè´ããã³ãã¾ãããè´ããé¨åããã®ã¡ã¢ã§ãã ãµã¼ãã¼ã¨ãã¦ã¯ãå®ä¾¡ãªãã¼ãã使ãããªã·ã¼ã§ãèªä½PCãµã¼ãã¼ã¨ã½ããã§è³ãæ¹éã ããã§ããããããGoogleã®ãµã¼ãã¼ã®æ¹éã«ä¼¼ã¦ãããããªããã¨ã®ãã¨ãã³ã¹ãé¢ããã¡ããããããã§ãããããã¨ã¨ãã«ãã½ãããã¤ã³ãã©ããã¼ãã®é²åã«è¿½å¾ããã¨ããã®ãçç±ã¨ãã¦å¤§ããããã§ããã¡ãªã¿ã«ãPixivãCerevoãã¾ããã¦èªä½ãµã¼ãã¼ã«ã³ãã¡ã¬ã³ã¹ãããããã¨èªã£ã¦ã¾ããã æè¿ã§ã¯ç¹ã«ãä»®æ³åãåæã¨ããæ§æãé¸ãã§
Ciscoã®TCPãããã³ã«ã«DoSã®èå¼±æ§ã¨ã®ãã¨ãMicrosoftã®ãã¤ã¨åä¸æ¥ã ããã£ã¦ãã¨ã§ãCiscoã®ãã¼ã¸è¦ãã¨é¢é£ãã¦ããã¨ã®ãã¨ã ç±³Cisco Systemsã¯9æ8æ¥ãå社製åã®TCPãããã³ã«ã«ãµã¼ãã¹å¦¨å®³ï¼DoSï¼ã®èå¼±æ§ã確èªãããã¨ãã¦ãä¿®æ£ã®ããã®ã½ããã¦ã§ã¢ã¢ãããã¼ããå ¬éããã Ciscoã®ã¢ããã¤ã¶ãªã¼ã«ããã°ããã®èå¼±æ§ãæªç¨ããã¨ãæ»æè ãTCPã®æ¥ç¶ç¶æ ãæä½ã§ããããã«ãªããTCPæ¥ç¶ãæä½ãããç¡æéã«long-livedç¶æ ã«ç½®ããã¦ãã¾ã£ãå ´åãã·ã¹ãã ã®ãªã½ã¼ã¹ã大éã«æ¶è²»ãããæ°ããªTCPæ¥ç¶ãåãå ¥ããããªããªãæããããã¨ããã å½±é¿ãåããã®ã¯ãCiscoã®IOS SoftwareãIOS-XE SoftwareãCatOS SoftwareãAdaptive Security Appliance (ASA) ï¼PIXãNX
ä½ããã®æ¹æ³(ãã«ã¹ã¯ã©ããã¾ãã¯BSDãã¼ã¹ç)ã§OSãã¤ãããä¸é¨(ãã©ã¤ããªã©)ã«Linuxã«ã¼ãã«ã®ã³ã¼ãã使ã£ãå ´åã (1) å ¨ã¦GPLã«ãªã (2) GPLã«ãªããªãããã¯ã£ãé¨åã ãGPLã§æ··ãã¦ä½¿ãã ã®ã©ã¡ããã ãOSãã¨ããã®ããã¢ãä¸è¬è«ã¯å½ã¦ã¯ã¾ããªãã GPLv2(Linuxã¯GPLv2ãªã®ã§)ã«ã¯OSä¾å¤æ¡é ãããã ãããç¹å¥ãªä¾å¤ã¨ãã¦ããã®ã³ã³ãã¼ãã³ãèªä½ãå®è¡å½¢å¼ã«ä»éããã®ã§ã¯ç¡ãéãã é å¸ããããã®ã®ä¸ã«ãå®è¡å½¢å¼ãå®è¡ããããªãã¬ã¼ãã£ã³ã°ã·ã¹ãã ã®ä¸»è¦ãªã³ã³ãã¼ãã³ã(ã³ã³ãã¤ã©ãã«ã¼ãã«ç)ã¨é常ä¸ç·ã«(ã½ã¼ã¹ããã¤ããªå½¢å¼ã®ã©ã¡ããã§)é å¸ããããã®ãå«ãã§ããå¿ è¦ã¯ãªãã¨ããã GPLv2(å訳) However, as a special exception, the source code distributed need no
次ã®ãã¼ã¸ åã®ãã¼ã¸ ç®æ¬¡ã¸ 6. ããã»ã¹ééä¿¡ã®ä»çµã¿ ããã»ã¹ã¯ãä»ã®ããã»ã¹ãã«ã¼ãã«ã¨ç¸äºã«éä¿¡ãããã¨ã§ãèªãã®ä½æ¥ã®èª¿æ´ ãå³ã£ã¦ãããLinux ã§ã¯ãããã¤ãã®ããã»ã¹ééä¿¡(Inter-Process Communication, IPC)ã®ã¡ã«ããºã ããµãã¼ãããã¦ãããã·ã°ãã«ã¨ãã¤ã㯠ãã®å ¸åã§ããããLinux 㯠System V IPC ã¡ã«ããºã ããµãã¼ããã¦ãããSystem V IPC ã¨ããå称ã¯ãUnix ã®å½è©²ãªãªã¼ã¹ã§åãã¦ç»å ´ãããã¨ãããã®åãä»ããã ã¦ããã 6.1 ã·ã°ãã« ã·ã°ãã«ã¯ãUnix ã·ã¹ãã ã§ä½¿ç¨ãããæãå¤ãããã»ã¹ééä¿¡ã®æ¹æ³ã§ããã ã·ã°ãã«ã¯ãã²ã¨ã¤ä»¥ä¸ã®ããã»ã¹ã«å¯¾ãã¦éåæã¤ãã³ã(asynchronous events)ã ä¼éããããã«ä½¿ç¨ããããã·ã°ãã«ãçæãããã®ã¯ããã¼ãã¼ãå²ãè¾¼ã¿ããã£
ï¼ã¹ãã³ãã«ãªPCã¸ã®OSå°å ¥æå¾ã®ç ¦ï¼(大ãããªâ¦) PXEãã¼ãç°å¢ã®æ§ç¯ããã¾ãã ããã§ã¯CentOSã使ã£ã¦ãã¾ãããä»ã®ãã£ã¹ããªãã¥ã¼ã·ã§ã³ã§ãä¼¼ããããªæé ã§è¡ããã¨æãã¾ãã å¿ è¦ãªããã±ã¼ã¸ã¯tftpã¨dhcpdãªã®ã§ã以ä¸ã®ã³ãã³ãã§å°å ¥ãã¾ãã
Latest Article: Slicehost Maintenance and Upgrades FAQ As part of our ongoing effort to provide you with the best Slicehost service possible, we routinely perform maintenance and upgrades of our underlying systems. Â The majority of these are performed non-disruptively, however maintenances sometimes arise that impact customer slices. Our Slice tutorials and articles take you through setting up, in
strace ã·ã¹ãã ã³ã¼ã«ããã¬ã¼ã¹ãã«ã¼ãã«ã¨ä½ã話ãã¦ãããã strace -p PID ã§ããã»ã¹ã«ã¢ã¿ãããå®è¡ä¸ã®ããã»ã¹ããã¬ã¼ã¹ã straceã使ã£ããããã° - SourceForge.JP Magazine : ãªã¼ãã³ã½ã¼ã¹ã®è©±é¡æºè¼ Linuxã«ã¼ãã«ã®ä½ãåºãä¸ç â ï¼ ITèªåæ¦ç¥ç 究æ - ãµã¤ãã®Linuxããã°ã©ãã³ã° éæ¨å³°é ã·ã¹ãã ã³ã¼ã«ã¨ã©ã¤ãã©ãªé¢æ° â ï¼ ITèªåæ¦ç¥ç 究æ ã·ã¹ãã ã³ã¼ã«ã»ã©ã¤ãã©ãªã«ã¼ãã³ - UNIX ã®é¨å± ltrace å ±æã©ã¤ãã©ãªã®å¼ã³åºãããã¬ã¼ã¹ã*.soã¨ä½ã話ãã¦ãããã ltrace -p PID ã§ããã»ã¹ã«ã¢ã¿ãããå®è¡ä¸ã®ããã»ã¹ããã¬ã¼ã¹ã ltrace ã§å ±æã©ã¤ãã©ãªã®é¢æ°å¼ã³åºãããã¬ã¼ã¹ãã - bkããã° 404 - ã¨ã©ã¼: 404 - Linux JF Æâ°ÆCÆuÆâ°ÆÅ âÃÅ
æï¼Jack Wallenï¼Special to TechRepublicï¼Â ç¿»è¨³æ ¡æ£ï¼æä¸é ç« ã»éå´è£å 2009-03-03 08:00 iptablesããã¹ã¿ã¼ããã«ã¯æéãããããã®ã®ãã»ãã¥ãªãã£ã«é¢ããåºæ¬çãªãã¼ãºãæºãããã¨ã®ã§ããããã¤ãã®ã«ã¼ã«ãç¥ã£ã¦ããã ãã§ãããªãã®Linuxã·ã¹ãã ã®ã»ãã¥ãªãã£ãåä¸ããããã¨ãã§ãããæ¬è¨äºã§ã¯ããã®æå§ãã¨ãªãéè¦ãªã«ã¼ã«ã解説ããã iptablesã¯ãLinuxãã·ã³ãã»ãã¥ã¢ã«ããããã®å¼·åãªãã¼ã«ã ãã¨ã¯è¨ããã®ã®ããã®æ©è½ã®å¤ãã«ã¯å§åããã¦ãã¾ããã¡ã§ãããããã¦ãã³ãã³ãã®æ§é ããã£ããã¨ç解ãããã·ã³ã®ã©ã®é¨åãã©ã®ããã«ã»ãã¥ã¢ã«ãã¹ãããææ¡ããå¾ã§ãã£ã¦ããããããããã¨ã«å¤ããã¯ãªããããããiptablesã®è¯ãã¨ããã¯ã極ãã¦åºããã®é©ç¨ç¯å²ã«ããããã®ãããiptablesã®ã«ã¼ã«ã®ããã¤ãã
è¦ãã¦ããã¨ããã¾ã«ä¾¿å©ãããããªã"bash"ã®ã³ãã³ãå±¥æ´ã®å±éã«é¢ããæããä¾ã交ããªããã¾ã¨ãã¦ã¿ã¾ããã æå¾ã«ãæ¸ãã¾ããããä»ã«ãããããããã¾ãã®ã§ãè²ã 試ãã¦ã¿ã¦ãã ããã ç´åã«å®è¡ããã³ãã³ããå®è¡ "!!"ã³ãã³ãã§ã1ã¤åã«å®è¡ããã³ãã³ããå度å®è¡ã§ãã¾ãã $ ls -l åè¨ 0 -rw-rw-r-- 1 rx7 rx7 0 2009-02-26 02:20 test $ !! ls -l åè¨ 0 -rw-rw-r-- 1 rx7 rx7 0 2009-02-26 02:20 test nååã«å®è¡ããã³ãã³ããå®è¡ "!-n"ã³ãã³ãã§ãnååã«å®è¡ããã³ãã³ããå度å®è¡ã§ãã¾ãã ä¾ãã°ã以ä¸ã®ä¾ã§ã¯ã"!-2"ã¨ããã¨ã2ååã«å®è¡ããã³ãã³ããå®è¡ãã¦ãã¾ãã $ ls test $ ls -l åè¨ 0 -rw-rw-r-- 1 rx7 rx7
GNU diff ã®å°å³ã ãã©ä¾¿å©ãªæ©è½ æè¿ã«ãªã£ã¦ GNU diff ã®å°å³ã ãã©ä¾¿å©ãªæ©è½ã2ã¤ç¥ãã¾ããã調ã¹ã¦ã¿ãã¨ãããããæããããæ©è½ã§ããã --side-by-side ã¯2段çµã§çµæã表示ãããªãã·ã§ã³ã§ããå¤æ´ããã¦ããªãè¡ãå«ãã¦2ã¤ã®ãã¡ã¤ã«ã®å å®¹å ¨ä½ã¨å¤æ´ç¹ã表示ãããã®ããã¤ã³ãã§ããå¤æ´ãããè¡ã®åå¾æ°è¡ã ãã§ãªããã¡ã¤ã«å ¨ä½ãã¾ã¨ãã¦èªã¿ããã¨ãã«ä½¿ãã¾ããããã©ã«ãã®è¡¨ç¤ºã®æ¨ªå¹ ã¯130æåã§ããå¿ è¦ã«å¿ã㦠--width ãªãã·ã§ã³ã§å¤æ´ã§ãã¾ãã ãããã£ãç¨éã«ã¯ meld ãªã©ã® GUI ã® diff ãã¼ã«ã使ãã°ããã®ã§ããã ssh 端æ«ãããªããããªç¶æ³ã§éå®ãã¾ãã --strip-trailing-cr ã¯è¡æ«ã® CR ãç¡è¦ããæ©è½ã§ããæ¹è¡ã³ã¼ãã CRLF 㨠LF ã§é£ãéã£ã¦ãããã©ãä¸èº«ã¯ã»ã¼åããã¨ãããã¡ã¤ã«ãæ¯è¼ã
æå¤ã¨ç¥ããã¦ããªããããªæ°ãããã "cd"ã³ãã³ãã§ä½æ¥ãã£ã¬ã¯ããªã移åããéã«ã1ã¤åã«ãããã£ã¬ã¯ããªã«æ»ããã¨ãã§ããã $ cd -ä¸è¨ã³ãã³ããå®è¡ããã®ã¿ã 以ä¸ã«ä¾ãæ¸ãã¦ããã [rx7@domU-ubuntu ~]$ cd /var [rx7@domU-ubuntu var]$ cd /tmp [rx7@domU-ubuntu tmp]$ cd - /var [rx7@domU-ubuntu var]$ cd - /tmp [rx7@domU-ubuntu tmp]$ä¸ã®ä¾ã§ã¯ã"/var"ãã"/tmp"ã¸ç§»åããå¾ã"cd -"ã³ãã³ãã§ãå ã«ãã"/var"ã¸ã¨æ»ã£ã¦ããã ããããä¸åº¦"cd -"ã³ãã³ããå®è¡ãã¦ããããã«1ã¤åã«ãããã£ã¬ã¯ããªã«æ»ãã®ã§ã¯ãªããæ»ããã¨ããåã®å ã ããä½æ¥ãã£ã¬ã¯ããªã«æ»ãã ãã¨ãªãã (ã1ã¤åã«ããä½æ¥ãã£ã¬ã¯ããªã«
ãªãªã¼ã¹ãé害æ å ±ãªã©ã®ãµã¼ãã¹ã®ãç¥ãã
ææ°ã®äººæ°ã¨ã³ããªã¼ã®é ä¿¡
å¦çãå®è¡ä¸ã§ã
j次ã®ããã¯ãã¼ã¯
kåã®ããã¯ãã¼ã¯
lãã¨ã§èªã
eã³ã¡ã³ãä¸è¦§ãéã
oãã¼ã¸ãéã
{{#tags}}- {{label}}
{{/tags}}