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tekimen id:tekimen

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tekimen 2024/12/14
linux

kernel

network
ãƒªãƒ³ã‚¯
eBPFã«3æ—¥ã§å…¥é–€ã—ãŸè©± - CADDi Tech Blog
ã¯ã˜ã‚ã« eBPF ã¨ã¯ãªã«ã‹ ã–ã£ãã‚Šæ¦‚è¦ ã€ŒPacket Filterã€ãªã®ã«ã€ŒVirtual Machineã€? eBPFã§ãªã«ãŒã§ãã‚‹ã‹? ã‚«ãƒ¼ãƒãƒ«ã‚¤ãƒ™ãƒ³ãƒˆã®ãƒ•ãƒƒã‚¯ ãƒ¦ãƒ¼ã‚¶ãƒ¼ãƒ©ãƒ³ãƒ‰ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã¨ã®ã‚„ã‚Šã¨ã‚Š eBPFã®ä¸»ãªç”¨é€” eBPFãŒæ³¨ç›®ã•ã‚Œã‚‹èƒŒæ™¯ eBPFã®ä»•çµ„ã¿ ã‚¢ãƒ¼ã‚ãƒ†ã‚¯ãƒãƒ£ã¨å‡¦ç†ãƒ•ãƒãƒ¼ ã‚«ãƒ¼ãƒãƒ«ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã¨eBPFã®é•ã„ eBPFãƒ—ãƒã‚°ãƒ©ãƒ ã®ä½œã‚Šæ–¹ eBPFãƒ—ãƒã‚°ãƒ©ãƒ ã‚’ä½œã£ã¦ã¿ã‚‹ ç’°å¢ƒã®æº–å‚™ Hello world ã‚‚ã†å°‘ã—è¤‡é›‘ãªã‚µãƒ³ãƒ—ãƒ« ãã®ä»–ã®ã‚µãƒ³ãƒ—ãƒ« HTTPãƒªã‚¯ã‚¨ã‚¹ãƒˆã®ãƒ€ãƒ³ãƒ— TCPæŽ¥ç¶šå…ˆã®èª¿æŸ» tcplife dirtop filetop oomkill ã¾ã¨ã‚ eBPFã¯ãªã«ã«ä½¿ãˆã‚‹ã‹ å‚è€ƒã‚µã‚¤ãƒˆ ã¯ã˜ã‚ã« ã“ã‚“ã«ã¡ã¯ã€Platformãƒãƒ¼ãƒ ã®å°æ£®ã§ã™ã€‚ eBPF (extended Berkley Packet Filter) ã«ã¤ã„ã¦ã€2022å¹´8æœˆ2
tekimen 2024/02/28
linux

c

kernel

ebpf
ãƒªãƒ³ã‚¯
Linux ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ« å¾¹åº•å…¥é–€
Linux ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã«ã¤ã„ã¦èª¿ã¹ãŸã“ã¨ã‚’ã¾ã¨ã‚ã‚‹ã€‚ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã®ä»•çµ„ã¿ã‚’ç†è§£ã™ã‚‹ã¨ã€ OS ã¨ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ãŒã©ã®ã‚ˆã†ã«é€£æºã—ã¦å‹•ã„ã¦ã„ã‚‹ã®ã‹ã‚’ç†è§£ã§ãã‚‹ã‚ˆã†ã«ãªã‚Šã¾ã™ã€‚ ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã¯ CPU ã«ä¾å˜ã™ã‚‹å‡¦ç†ãŒå¤šã„ãŸã‚ã€ x86_64 ã«çµžã‚Šã¾ã™ã€‚ æ¤œè¨¼ç’°å¢ƒ]# cat /etc/redhat-release CentOS Linux release 8.0.1905 (Core) ]# uname -a Linux localhost.localdomain 4.18.0-80.11.2.el8_0.x86_64 #1 SMP Tue Sep 24 11:32:19 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux ]# cat /proc/cpuinfo | head processor : 0 vendor_id : GenuineInte
tekimen 2023/09/24
ã‚·ã‚¹ãƒ†ãƒ

ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°

kernel

linux
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linux systemã«ãŠã‘ã‚‹initã®æœ€æœŸ
Linux Advent Calender 2018ã®ï¼‘ï¼˜æ—¥ç›®ã§ã™ã€‚ å…ƒã€…ã®äºˆå®šã¯ãƒœãƒ„ã«ãªã£ãŸ!?ã®ã§ ã¡ã‚‡ã£ã¨å¤ã„è©±ã«ãªã‚Šã¾ã™ã€‚ ï¼—æ—¥ç›®ã®systemdç†è§£ã®ãƒ’ãƒ³ãƒˆ - systemdã®æ¦‚å¿µã¨æ´å²ã¨ç›¸åã™ã‚‹ã‚ˆã†ãªè¨˜äº‹ã§ã™ã€‚ å¤ã„æƒ…å ±ã‚‚å¿…è¦ã¨ã—ã¦ã„ã‚‹çµ„è¾¼ã‚‚ã‚“ã‚‚ã„ã‚‹ã®ã§ã€ãã®åŠ©ã‘ã¨ãªã‚Šã¾ã—ãŸã‚‰å¹¸ã„ã§ã™ã€‚ initã¨ã¯ PID=1ã¨ã—ã¦ã€ã‚«ãƒ¼ãƒãƒ«ã®åˆæœŸåŒ–ãŒçµ‚ã‚ã£ã¦åˆã‚ã¦ç”Ÿæˆã•ã‚Œã‚‹ãƒ—ãƒã‚»ã‚¹ã§ã™ã€‚ ãƒ¦ãƒ¼ã‚¶ãƒ©ãƒ³ãƒ‰ã§å¿…è¦ãªãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã®ãƒžã‚¦ãƒ³ãƒˆãƒ»ã‚·ã‚¹ãƒ†ãƒ è¨å®šãƒ»ã‚µãƒ¼ãƒ“ã‚¹ï¼ˆãƒ‡ãƒ¼ãƒ¢ãƒ³ï¼‰ã‚„ãƒ—ãƒã‚»ã‚¹èµ·å‹•ã‚’è¡Œã„ã¾ã™ã€‚ kernel parameterã« init=ã§initã‚³ãƒžãƒ³ãƒ‰ã‚’æŒ‡å®šã™ã‚‹ã“ã¨ãŒã§ãã¾ã™ã€‚çœç•¥ã™ã‚‹ã¨ /sbin/initãªã©ãŒå‚ç…§ã•ã‚Œã¾ã™ã€‚ init=/etc/preinit ã“ã“ã§ã¯ çµ„è¾¼è£…ç½®ã‚’å‰æã¨ã—ã¦ã€busyboxã®initã‚’æƒ³å®šã—ã¾ã™ è¨å®šãƒ•ã‚¡ã‚¤ãƒ« initãŒèµ·å‹•ã™ã‚‹ã¨ã€ä»¥ä¸‹ã®ãƒ•ã‚¡
tekimen 2018/12/19
linux

kernel
ãƒªãƒ³ã‚¯
ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã‚µã‚¤ã‚ºã®æ‹¡å¼µæ™‚ã«ãƒ‡ãƒ¼ã‚¿ãƒ™ãƒ¼ã‚¹ã‚¢ã‚¯ã‚»ã‚¹ãŒã‚¹ãƒãƒ¼ãƒ€ã‚¦ãƒ³ã™ã‚‹å•é¡Œã®è§£æ±º - Cybozu Inside Out | ã‚µã‚¤ãƒœã‚¦ã‚ºã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ã®ãƒ–ãƒã‚°
ã¯ã˜ã‚ã« ã“ã‚“ã«ã¡ã¯ã€æŠ€è¡“é¡§å•ã®satã§ã™ã€‚ ã‚µã‚¤ãƒœã‚¦ã‚ºã§ã¯ã€ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã‚µã‚¤ã‚ºæ‹¡å¼µæ™‚ã«ãƒ‡ãƒ¼ã‚¿ãƒ™ãƒ¼ã‚¹ã‚¢ã‚¯ã‚»ã‚¹ãŒã‚¹ãƒãƒ¼ãƒ€ã‚¦ãƒ³ã™ã‚‹ã¨ã„ã†å•é¡Œã«é•·å¹´æ‚©ã¾ã•ã‚Œã¦ãã¾ã—ãŸã€‚æœ¬è¨˜äº‹ã§ã¯é‹ç”¨æœ¬éƒ¨ã®è—¤ç”°ã¨æ·±è°·ãŒã“ã®å•é¡Œã‚’è§£æ±ºã—ãŸæµã‚Œã«ã¤ã„ã¦å ±å‘Šã„ãŸã—ã¾ã™ã€‚å•é¡Œã‚’è§£æ±ºã™ã‚‹ãŸã‚ã«2äººã¯Linuxã‚«ãƒ¼ãƒãƒ«ã‚’ä¿®æ£ã—ã¾ã—ãŸã€‚ä¿®æ£ã¯ç¤¾å†…ã«é–‰ã˜ãŸã‚‚ã®ã§ã¯ãªãã€åŸ·ç†å½“æ™‚ã®æœ€æ–° Linuxã‚«ãƒ¼ãƒãƒ«ã§ã‚ã‚‹v4.17ã«ãƒžãƒ¼ã‚¸ã•ã‚Œã¦ã„ã¾ã™ã€‚ å•é¡Œ ä»¥ä¸‹ã®æ“ä½œã®å¾Œã«ãƒ‡ãƒ¼ã‚¿ãƒ™ãƒ¼ã‚¹ã¸ã®ã‚¢ã‚¯ã‚»ã‚¹ãŒä¸€æ™‚çš„ã«ã‚¹ãƒãƒ¼ãƒ€ã‚¦ãƒ³ã™ã‚‹ ãƒ–ãƒãƒƒã‚¯ãƒ‡ãƒã‚¤ã‚¹ã®ã‚µã‚¤ã‚ºã‚’æ‹¡å¼µã™ã‚‹ ä¸Šè¨˜ãƒ‡ãƒã‚¤ã‚¹ä¸Šã«ã‚ã‚‹ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã®ã‚µã‚¤ã‚ºã‚’æ‹¡å¼µã™ã‚‹ åŽŸå› linuxã‚«ãƒ¼ãƒãƒ«ã¯ãƒ–ãƒãƒƒã‚¯ãƒ‡ãƒã‚¤ã‚¹ã®ã‚µã‚¤ã‚ºå¤‰æ›´(ç¸®å°ãŠã‚ˆã³æ‹¡å¼µ)æ™‚ã«ã€å½“è©²ãƒ‡ãƒã‚¤ã‚¹ä¸Šã«ã‚ã‚‹ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã®ãƒšãƒ¼ã‚¸ã‚ãƒ£ãƒƒã‚·ãƒ¥(å¾Œè¿°)ã‚’ç„¡åŠ¹åŒ–ã™ã‚‹*1 è§£æ±ºæ–¹æ³• ãƒ–ãƒãƒƒã‚¯ãƒ‡ãƒã‚¤ã‚¹ã®ã‚µã‚¤ã‚ºæ‹¡å¼µæ™‚ã«ã¯ãƒšãƒ¼ã‚¸ã‚ãƒ£ãƒƒã‚·ãƒ¥ã‚’ç„¡åŠ¹
tekimen 2018/06/28
linux

kernel
ãƒªãƒ³ã‚¯
Linuxã®ãƒ†ã‚¹ãƒˆç”¨ã«ã€ãƒãƒ³ã‚°ã‚¢ãƒƒãƒ—ã‚„ãƒ‘ãƒ‹ãƒƒã‚¯çŠ¶æ…‹ã«ã™ã‚‹ã‚«ãƒ¼ãƒãƒ«ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã‚’ä½œã£ã¦ã¿ãŸ - ã®ã´ã´ã®ãƒ¡ãƒ¢
ãƒ†ã‚¹ãƒˆã®ãŸã‚ã«ã€AWSã®Amazon Linuxã®ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ã‚’ã‚«ãƒ¼ãƒãƒ«ãƒ¬ãƒ™ãƒ«ã§ãƒãƒ³ã‚°ã‚¢ãƒƒãƒ—ã•ã›ãŸã‹ã£ãŸã®ã§ã€ãƒ†ã‚¹ãƒˆç”¨ã®ã‚«ãƒ¼ãƒãƒ«ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã‚’ä½œã£ã¦ã¿ã¾ã—ãŸã€‚ ã§ãã‚‹ã“ã¨ ã‚«ãƒ¼ãƒãƒ«ã®ãƒãƒ³ã‚°ã‚¢ãƒƒãƒ—(pingå¿œç”ã‚‚ã§ããªã„ãƒ¬ãƒ™ãƒ«ã€‚ãƒ—ãƒªã‚¨ãƒ³ãƒ—ã‚·ãƒ§ãƒ³ã‚’disableã«ã—ã¦å®Ÿç¾) ä¸é€”åŠç«¯ãªãƒãƒ³ã‚°ã‚¢ãƒƒãƒ—(pingå¿œç”ã¯å¸°ã‚‹ãƒ¬ãƒ™ãƒ«ã€‚ãƒªã‚¨ãƒ³ãƒ—ã‚·ãƒ§ãƒ³ã¯enable) ã‚«ãƒ¼ãƒãƒ«ãƒ‘ãƒ‹ãƒƒã‚¯(echo c > /proc/sysrq-triggerã¨åŒã˜) ä½¿ã„æ–¹ ã‚«ãƒ¼ãƒãƒ«ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã®ãƒ“ãƒ«ãƒ‰ ã‚³ãƒ¼ãƒ‰ã¯GitHubã«ã‚ã‚Šã¾ã™ã€‚ github.com (1) å¿…è¦ãªãƒ‘ãƒƒã‚±ãƒ¼ã‚¸ã®ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ« ã‚«ãƒ¼ãƒãƒ«ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã®ãƒ“ãƒ«ãƒ‰ã«ã€gccã¨kernel-develãŒå¿…è¦ã«ãªã‚Šã¾ã™ã€‚(Amazon Linuxã®å ´åˆ) sudo yum -y install git gcc kernel-devel(2) ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã‚’ãƒãƒ¼ã‚«ãƒ«ã«æŒã£
tekimen 2018/05/20
kernel

linux
ãƒªãƒ³ã‚¯
GitBook â€“ Knowledge management for technical teams
GitBook brings all your technical knowledge together in a single, centralized knowledge base. So you can access and add to it in the tools you use every day â€” using code, text or even your voice.
tekimen 2017/11/14
linux

kernel
ãƒªãƒ³ã‚¯
1