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Linuxã«é–¢ã™ã‚‹koemuã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (298)

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Amazon Linux 2ã‚’Amazon Linux 2023ã«ç§»è¡Œã—ãŸãã¦...å¤
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koemu 2023/07/10
AWS

linux
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Stray Penguin - Linux Memo (Iptables tutorial)
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koemu 2020/05/02
iptables ãƒªãƒ•ã‚¡ãƒ¬ãƒ³ã‚¹ ãŸã ã—ç¾åœ¨ã§ã¯å¤ã„æƒ…å ±ã‚‚ã‚ã‚‹

Linux

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How to: Linux Iptables block common attacks - nixCraft
Following list summaries the common attack on any type of Linux computer: Syn-flood protection In this attack system is floods with a series of SYN packets. Each packets causes system to issue a SYN-ACK responses. Then system waits for ACK that follows the SYN+ACK (3 way handshake). Since attack never sends back ACK again entire system resources get fulled aka backlog queue. Once the queue is full
koemu 2020/05/02
Linux

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systemd service sandboxing and security hardening 101
systemd enable services to run with a whole suite of hardening and sandboxing features from the Linux kernel. Hereâ€™s how to get a quick security review of the services running on your system and how to go about hardening their security. The Linux kernel can filter and limit access to file systems, networks, devices, kernel capabilities and system calls (syscalls), and more. In this article, Iâ€™ll f
koemu 2020/02/10
Linux

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CentOS8 (Minimum) ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ«ã—ã¦ã¨ã‚“ã§ã‚‚ãªã‹ã£ãŸã“ã¨ä¸€è¦§
-Nã‚ªãƒ—ã‚·ãƒ§ãƒ³ã«ã¤ã„ã¦CentOS7ã®ls (8.22)ã®manpageã‚’è¦‹ã‚‹ã¨ã€å®Ÿã¯è¼‰ã£ã¦ã„ã‚‹ãŒå¾®å¦™ã«ç•°ãªã‚‹ã€‚ -N, --literal print raw entry names (don't treat e.g. control characters speâ€ cially)CentOS8ã®ls (8.30)ã¯ã“ã†ã ã€‚ -N, --literal print entry names without quotingmanpageã«ã¯ä»¥å‰ã®ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã‹ã‚‰-Qã‚„--quoting-styleãªã©ã®ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã¯ã‚ã‚‹ãŒã€ãã‚‚ãã‚‚ãƒ¡ã‚¿æ–‡å—ã‚’ã‚¯ã‚©ãƒ¼ãƒˆã™ã‚‹å‹•ä½œãã®ã‚‚ã®ã«ã¤ã„ã¦ã¯ä½•ã®èª¬æ˜Žã‚‚ãªã„ã€‚ã„ã¤ã©ã®ã‚¿ã‚¤ãƒŸãƒ³ã‚°ã‹åˆ†ã‹ã‚‰ãªã„ãŒã€ãƒ¡ã‚¿æ–‡å—ã®æ‰±ã„ãŒçªç„¶å¤‰æ›´ã«ãªã£ãŸã‚ˆã†ã ã€‚ -Nã«ã‚ˆã‚‹å‹•ä½œã®é•ã„ã‚’æ¯”è¼ƒã—ã¦ã¿ã‚‹ã¨ã€ ã‚¯ã‚©ãƒ¼ãƒˆã•ã‚ŒãŸãƒ•ã‚¡ã‚¤ãƒ«ã‚’å«ã‚€ã¨ã€æœ‰ç„¡ã‚’è¨€ã‚ã•ãšã™ã¹ã¦ã®ã‚«ãƒ©ãƒ ã«ãƒ‘ãƒ‡ã‚£ãƒ³ã‚°ãŒå…¥ã‚‹ã‚ˆã†ã ã€‚ ã¨ã‚Š
koemu 2019/10/02
Linux
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How to Setup a VPN with OpenVPN on Debian 9 Stretch Linux
koemu 2018/05/23
Raspberry PIã‚‚Debianç³»ãªã®ã§ãã®ã¾ã¾è¡Œã‘ã‚‹ã€‚ã„ã‚ã„ã‚æŽ¢ã—ãŸã‘ã©ã“ã‚ŒãŒã¾ã¨ã‚‚ãªä¾‹ãªæ°—ãŒã™ã‚‹ã€‚

VPN

Linux
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Debian GNU/Linux ã§ L2TP / IPsec ã‚’ä½¿ç”¨ã™ã‚‹ VPN ã‚µãƒ¼ãƒã‚’è¨å®šã™ã‚‹ (ã‚µãƒ¼ãƒå´ã§ NAPT ã—ãªã„å ´åˆ) | Open the Next
koemu 2018/01/29
VPN

Debian

Linux
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ãƒ«ãƒ³ãƒã‚’Raspberry Piã‚’ä½¿ã£ã¦ROSã§ã‚³ãƒ³ãƒˆãƒãƒ¼ãƒ«ã§ãã‚‹ã‚ˆã†ã«æ”¹é€ ã—ã¦ã¿ãŸï¼ˆåŠç”°ä»˜ã‘ç„¡ã—ã§OKï¼‰ - karaage. [ã‹ã‚‰ã‚ã’]
ãƒ«ãƒ³ãƒã‚’è²·ã£ãŸã®ã§æ—©é€Ÿæ”¹é€ ã—ã¦ã¿ã‚‹ã“ã¨ã«ã—ã¾ã—ãŸ ãšã£ã¨æ¬²ã—ã‹ã£ãŸãƒ«ãƒ³ãƒã‚’è³¼å…¥ã—ã¾ã—ãŸã€‚ ãƒ«ãƒ³ãƒ 606 ã‚¢ã‚¤ãƒãƒœãƒƒãƒˆ ãƒãƒœãƒƒãƒˆæŽƒé™¤æ©Ÿ é«˜é€Ÿå¿œç”ãƒ—ãƒã‚»ã‚¹iAdaptæè¼‰ ã‚´ãƒŸæ¤œçŸ¥ã‚»ãƒ³ã‚µãƒ¼ è‡ªå‹•å……é›» ãƒšãƒƒãƒˆã®æ¯› ãƒ•ãƒãƒ¼ãƒªãƒ³ã‚° ç•³ã«ã‚‚ ãƒ–ãƒ©ãƒƒã‚¯ R606060 ã‚¢ã‚¤ãƒãƒœãƒƒãƒˆ(IRobot)Amazon æ³¨ï¼šå‹•ä½œç¢ºèªã—ãŸã®ã¯ãƒ«ãƒ³ãƒ622ã§ã—ãŸãŒã€ã™ã§ã«å“åˆ‡ã‚Œã®ãŸã‚ã€åŒã˜600ã‚·ãƒªãƒ¼ã‚ºã§å®‰ä¾¡ãª606ã‚’ä»£ã‚ã‚Šã«ç´¹ä»‹ã—ã¦ã„ã¾ã™ ç›®çš„ã¯ã‚‚ã¡ã‚ã‚“ãŠæŽƒé™¤ã—ã¦ã‚‚ã‚‰ã†ã“ã¨ãªã®ã§ã™ãŒã€ã‚„ã¯ã‚Šãƒ«ãƒ³ãƒã‚’è²·ã£ãŸã‚‰è‰²ã€…ã„ã˜ã‚ŠãŸããªã£ã¦ã—ã¾ã„ã¾ã™ãã€‚ã¨ã„ã†ã‚ã‘ã§ã€ã‚µã‚¯ãƒƒã¨Raspberry Piã§ãƒ«ãƒ³ãƒã‚’ã‚³ãƒ³ãƒˆãƒãƒ¼ãƒ«ã—ã¦ã¿ã‚‹ã“ã¨ã«ã—ã¾ã—ãŸã€‚ æ–¹é‡ã¯ä»¥ä¸‹ã§ã™ã€‚ Raspberry Piã¨ROS(Robot Operating System)ã‚’ä½¿ã† æ™®é€šã«æŽƒé™¤æ©Ÿã¨ã—ã¦ã‚‚ä½¿ã†ã®ã§ã€åŸºæœ¬çš„ã«å…ƒã«æˆ»ã›ãªã„æ”¹é€ ã¯ã—ãªã„ ROSã«é–¢ã—ã¦
koemu 2017/11/24
Raspberry Pi

Linux

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Linuxã®ãƒ‘ãƒƒã‚±ãƒ¼ã‚¸ã‚’ã‚¢ãƒƒãƒ—ãƒ‡ãƒ¼ãƒˆã—ãŸã‚ã¨restartãŒå¿…è¦ãªãƒ—ãƒã‚»ã‚¹ã‚’è¦‹ã¤ã‘ã‚‹æ–¹æ³• - Qiita
ã¯ã˜ã‚ã« è„†å¼±æ€§å¯¾å¿œã®ãŸã‚ã®ã‚¢ãƒƒãƒ—ãƒ‡ãƒ¼ãƒˆä½œæ¥ã¨ã„ã†ã‚‚ã®ã¯é »ç¹ã«ç™ºç”Ÿã™ã‚‹ã‚‚ã®ã§ã™ãŒã€æœ¬ç•ªé‹ç”¨ã—ã¦ã„ã‚‹ã‚·ã‚¹ãƒ†ãƒ ã§ã¯ã‚µãƒ¼ãƒ“ã‚¹ã¸ã®å½±éŸ¿ã‚’æœ€å°é™ã«ã—ãŸã„ã‚‚ã®ã§ã™ã€‚ ã‚¢ãƒƒãƒ—ãƒ‡ãƒ¼ãƒˆã—ãŸå¾Œã€å‡ºæ¥ã‚‹ã“ã¨ãªã‚‰å¿…è¦ãªãƒ—ãƒã‚»ã‚¹ã ã‘ãƒªã‚¹ã‚¿ãƒ¼ãƒˆã•ã›ã‚‹ã“ã¨ã§æ¸ˆã¾ã›ãŸã„ã®ã§ã™ãŒã€ã©ã®ãƒ—ãƒã‚»ã‚¹ã‚’ãƒªã‚¹ã‚¿ãƒ¼ãƒˆã™ã‚Œã°è‰¯ã„ã®ã‹ã€ãã‚‚ãã‚‚OSå†èµ·å‹•ã—ãªã„ã¨åæ˜ ã•ã‚Œãªã„ã‚‚ã®ãªã®ã‹ã€åˆ¤æ–ãŒä»˜ã‹ãªã„å ´åˆãŒå°‘ãªãã‚ã‚Šã¾ã›ã‚“ã€‚ ãã®ã‚ˆã†ãªå ´åˆã®ãŸã‚ã€å†èµ·å‹•ãŒå¿…è¦ãªãƒ—ãƒã‚»ã‚¹ã‚’è¦‹ã¤ã‘ãŸã‚Šã€OSå†èµ·å‹•ãŒå¿…è¦ã‹ã©ã†ã‹ã‚¢ãƒ‰ãƒã‚¤ã‚¹ã—ã¦ãã‚Œã‚‹ã‚³ãƒžãƒ³ãƒ‰ãŒã‚ã‚Šã¾ã™ã€‚ Redhatç³» ã€Œyum-utilsã€ãƒ‘ãƒƒã‚±ãƒ¼ã‚¸ã«å…¥ã£ã¦ã„ã‚‹ã€Œneeds-restartingã€ã‚³ãƒžãƒ³ãƒ‰ã‚’ä½¿ã„ã¾ã™ã€‚ # needs-restarting -h Usage: needs-restarting: Report a list of process ids of programs th
koemu 2017/06/27
systemdçµŒç”±ã®è©±ã¯çŸ¥ã‚‰ã‚“ã‹ã£ãŸ

Linux

Debian
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Linux/UNIXã®sortã‚³ãƒžãƒ³ãƒ‰ã§IPã‚¢ãƒ‰ãƒ¬ã‚¹ã®ã‚½ãƒ¼ãƒˆã‚’è¡Œã† | ä¿ºçš„å‚™å¿˜éŒ² ã€œãªã‚“ã‹ã„ã‚ã„ã‚ã€œ
2017/02/12 è¿½è¨˜ ä»¥ä¸‹ã®å†…å®¹ã‚’è¨˜è¿°ã—ã¦ã„ãŸæ™‚ã¯çŸ¥ã‚‰ãªã‹ã£ãŸã®ã ãŒã€GNU sortã‚’ä½¿ã£ã¦ã„ã‚‹ã®ã§ã‚ã‚Œã°æ™®é€šã«ã€Œ-V(--version-sort)ã€ã§å‡¦ç†ã™ã‚‹ã»ã†ãŒã„ã„ã€‚ (Mac OS Xã ã¨gsortãŒå¿…è¦) sort -V blacknon@BS-PUB-DEVELOP:~$ cat test.txt 192.168.0.102 192.168.0.8 192.168.0.97 192.168.0.68 192.168.0.99 192.168.0.66 192.168.0.24 blacknon@BS-PUB-DEVELOP:~$ sort -V test.txt 192.168.0.8 192.168.0.24 192.168.0.66 192.168.0.68 192.168.0.97 192.168.0.99 192.168.0.102 ãã®ä»–ã€sortã‚³ãƒžãƒ³ãƒ‰ã«
koemu 2017/02/10
å‰è·æ™‚ä»£ã«çŸ¥ã‚ŠãŸã‹ã£ãŸã‚„ã¤ã

IP

Linux

unix

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Linux Performance
static, benchmarking, tuning: sar, perf-tools, bcc/BPF: bpftrace, BPF book: Images license: creative commons Attribution-ShareAlike 4.0. This page links to various Linux performance material I've created, including the tools maps on the right. These use a large font size to suit slide decks. You can also print them out for your office wall. They show: Linux observability tools, Linux static perfor
koemu 2017/01/31
ç·ã¾ã¨ã‚ã

Linux

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ITã‚¤ãƒ³ãƒ•ãƒ©
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[postgres]å¤§å®¹é‡ãƒ¡ãƒ¢ãƒªã‹ã¤OSãŒRHEL(CentOS)6ç³»ã‚’ãŠä½¿ã„ã®æ–¹ã€THPã®defragã¯æ¢ã‚ãŸæ–¹ãŒè‰¯ã„ã§ã™ã‚ˆ - Qiita
â– ç¾è¡Œè¨å®šç¢ºèª # cat /sys/kernel/mm/transparent_hugepage/defrag â‡’alwayã§ã‚ã‚Œã°å¯¾è±¡ â– ã‚ã‚Œï¼Ÿsysé«˜ã„ãªã¨æ€ã£ãŸã¨ãã«æ‰“ã¤ # perf top â‡’ä»¥ä¸‹ã®ã‚ˆã†ã«å‡ºãŸã‚‰ã™ãã«THPã®defragè¨å®šã‚’è¦‹ç›´ã—ã¾ã—ã‚‡ã† ï½žï½žï½ž Samples: 2M of event 'cycles', Event count (approx.): 908733026153 42.59% [kernel] [k] compaction_allocã€€ã€€â†â˜…ã“ã‚Œ (åœ§ç¸®_å†é…ç½®) 8.09% [kernel] [k] __reset_isolation_suitable 2.32% [kernel] [k] compact_zone ... ï½žï½žï½ž èµ·ããŸã“ã¨ CPUä½¿ç”¨çŽ‡ã®sysãŒå¼µã‚Šä»˜ã postgresã®å‡¦ç†ãŒæ¢ã¾ã‚‹ postgresã®ãƒ—ãƒã‚»ã‚¹ãŒå¤§é‡
koemu 2016/12/07
Red Hatç‹¬è‡ªå®Ÿè£…ã‚‰ã—ã„ã®ã§PostgreSQLã‚’CentOS, RHELã‚’ä½¿ã†ã¨ãã¯è¦æ³¨æ„

postgreSQL

Linux
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Tuning Linux for MongoDB
In this post, weâ€™ll discuss tuning Linux for Mongo DB deployments. By far the most common operating system youâ€™ll see Mongo DB running on is Linux 2.6 and 3.x. Linux flavors such as CentOS and Debian do a fantastic job of being a stable, general-purpose operating system. Linux runs software on hardware ranging from tiny computers likeÂ the Raspberry Pi up to massive data center servers. To make this
koemu 2016/08/16
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Linux

Kernel

mongodb

memory
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The Definitive Guide to Linux System Calls | Packagecloud Blog
TL;DR This blog post explains how Linux programs call functions in the Linux kernel.Â It will outline several different methods of making systems calls, how to handcraft your own assem bly to make system calls (examples included), kernel entry points into system calls, kernel exit points from system calls, glibc wrappers, bugs, and much, much more. Here is a summary of the topics this blog post will
koemu 2016/07/29
Linux

é–‹ç™º
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ç¬¬431å›žã€€Debian 0.91ã‚’ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ«ã—ã‚ˆã† | gihyo.jp
ä»Šå›žã¯1994å¹´ã®1æœˆã«ãƒªãƒªãƒ¼ã‚¹ã•ã‚ŒãŸã°ã‹ã‚Šã®ã€ŒDebian 0.91ã€ã‚’ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ«ã—ã¦ã¿ã¾ã—ã‚‡ã†ã€‚ã¨ã¯ã„ãˆå®Ÿæ©Ÿã«ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ«ã¨ãªã‚‹ã¨ã€ã„ã‚ã„ã‚ã¨éŽåŽ»ã®éºç‰©ã‚’ç™ºæŽ˜ã—ãªã‘ã‚Œã°ãªã‚Šã¾ã›ã‚“ã®ã§ã€æœ¬è¨˜äº‹ã§ã¯ä»®æƒ³ãƒžã‚·ãƒ³ï¼ˆQEMUï¼‰ã‚’ä½¿ç”¨ã—ã¾ã™ã€‚ ãªãœä»Šã€Debian 0.91ãªã®ã‹ï¼Ÿ å…ˆæ—¥ç™ºå£²ã•ã‚ŒãŸã€ŽSoftware Design 2016å¹´8æœˆå·ã€ï¼ˆâ ç´™ç‰ˆã€é›»åç‰ˆï¼‰ã®ç¬¬2ç‰¹é›†ã§ã¯ã€ã€Œâ Yumã¨APTã®ã—ãã¿ã¨æ´»ç”¨ã€ã¨é¡Œã—ã¦ãƒ‘ãƒƒã‚±ãƒ¼ã‚¸ãƒ³ã‚°ã‚·ã‚¹ãƒ†ãƒ ã®æ´å²ã‚„ã€åŸºæœ¬çš„ãªä½¿ã„æ–¹ã«ã¤ã„ã¦ç´¹ä»‹ã—ã¦ã„ã¾ã™ã€‚ Linuxãƒ‡ã‚£ã‚¹ãƒˆãƒªãƒ“ãƒ¥ãƒ¼ã‚·ãƒ§ãƒ³ã®æ´å²ã¯ã€ãƒ‘ãƒƒã‚±ãƒ¼ã‚¸ãƒ³ã‚°ã‚·ã‚¹ãƒ†ãƒ ã®æ´å²ã§ã‚‚ã‚ã‚Šã¾ã™ã€‚ãã“ã§ä»Šã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ«ã§ãã‚‹ä¸ã§ã‚‚ã£ã¨ã‚‚å¤ã„éƒ¨é¡žã«å…¥ã‚‹ã§ã‚ã‚ã†Debian 0.91ã‚’ä½¿ã†ã“ã¨ã§ã€ãƒ‘ãƒƒã‚±ãƒ¼ã‚¸ãƒ³ã‚°ã‚·ã‚¹ãƒ†ãƒ ã®é»Žæ˜ŽæœŸã‚’ä½“é¨“ã—ã¦ã‚‚ã‚‰ãŠã†ã¨ã„ã†ã®ãŒä»Šå›žã®Recipeã®è¶£æ—¨ã§ã™ã€‚ã•ã‚‰ã«ã‚ã‚ã‚ˆãã°ã€Recipeã®èªè€…ã«ä»Š
koemu 2016/07/27
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Linux

æ´å²
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koemu 2016/07/23
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Recent posts: 29 Oct 2024 Â» AI Flame Graphs 22 Jul 2024 Â» No More Blue Fridays 24 Mar 2024 Â» Linux Crisis Tools 17 Mar 2024 Â» The Return of the Frame Pointers 10 Mar 2024 Â» eBPF Documentary 28 Apr 2023 Â» eBPF Observability Tools Are Not Security Tools 01 Mar 2023 Â» USENIX SREcon APAC 2022: Computing Performance: What's on the Horizon 17 Feb 2023 Â» USENIX SREcon APAC 2023: CFP 02 May 2022 Â» Brendan
koemu 2016/07/21
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koemu 2016/05/31
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koemu 2016/03/28
Linux

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koemu 2016/03/08
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