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ngyuki id:ngyuki

linuxã«é–¢ã™ã‚‹ngyukiã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (181)

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ngyuki 2023/10/11
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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
ngyuki 2023/10/01
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ngyuki 2022/09/22
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ngyuki 2021/04/23
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(This post is also available in English.) ã“ã®è¨˜äº‹ã¯ In defence of swap: common misconceptions ã‚’ è‘—è€…ã® Chris Down ã•ã‚“ã®è¨±å¯ ã‚’å¾—ã¦ Hiroaki Nakamura ãŒæ—¥æœ¬èªžã«ç¿»è¨³ã—ãŸã‚‚ã®ã§ã™ã€‚ åŽŸæ–‡ã®ãƒ©ã‚¤ã‚»ãƒ³ã‚¹ ã¯ CC BY-SA 4.0 ã§ã‚ã‚Šã€ç¿»è¨³ã®ãƒ©ã‚¤ã‚»ãƒ³ã‚¹ã‚‚åŒã˜ã CC BY 4.0 ã¨ã—ã¾ã™ã€‚ é•·æ–‡ã‚’èªã¿ãŸããªã„æ–¹ã¸ã®è¦ç´„ï¼š ã‚¹ãƒ¯ãƒƒãƒ—ã‚’æŒã¤ã“ã¨ã¯æ£ã—ãæ©Ÿèƒ½ã™ã‚‹ã‚·ã‚¹ãƒ†ãƒ ã®ã‹ãªã‚Šé‡è¦ãªãƒã‚¤ãƒ³ãƒˆã§ã™ã€‚ ã‚¹ãƒ¯ãƒƒãƒ—ãŒç„¡ã‘ã‚Œã°ã€ã¾ã¨ã‚‚ãªãƒ¡ãƒ¢ãƒªç®¡ç†ã‚’å®Ÿç¾ã™ã‚‹ã“ã¨ã¯é›£ã—ããªã‚Šã¾ã™ã€‚ ã‚¹ãƒ¯ãƒƒãƒ—ã¯ä¸€èˆ¬çš„ã«ç·Šæ€¥äº‹æ…‹ç”¨ã®ãƒ¡ãƒ¢ãƒªã‚’å–å¾—ã™ã‚‹ãŸã‚ã®ã‚‚ã®ã§ã¯ãªãã€ãƒ¡ãƒ¢ãƒªã®å›žåŽã‚’å¹³ç‰ã«åŠ¹çŽ‡çš„ã«è¡Œã†ãŸã‚ã®ã‚‚ã®ã§ã™ã€‚ å®Ÿã®ã¨ã“ã‚ã€Œç·Šæ€¥äº‹æ…‹ç”¨ã®ãƒ¡ãƒ¢ãƒªã€ã¯ä¸€èˆ¬çš„ã«ç››å¤§ã«æ‚ªå½±éŸ¿ã‚’åŠã¼ã—ã¾ã™ã€‚ ã‚¹ãƒ¯ãƒƒãƒ—ã‚’ç„¡åŠ¹ã«ã™ã‚‹ã“ã¨ã¯
ngyuki 2020/02/19
linux
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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
ngyuki 2019/07/16
Linux ã®ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹è¨ˆæ¸¬ãƒ„ãƒ¼ãƒ«ã®ãƒžãƒƒãƒ—

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apt-getã¯ã¾ã ã‚ªãƒ¯ã‚³ãƒ³ã˜ã‚ƒãªã„è©±(2019å¹´4æœˆç¾åœ¨)
Debian9(stretch) åŠã³ Ubuntu18.04(bionic) ã«ãŠã„ã¦ã¯ apt-getã‚³ãƒžãƒ³ãƒ‰ã¯ã‚ªãƒ¯ã‚³ãƒ³( deprecated/obsolete)ã§ã¯ã‚ã‚Šã¾ã›ã‚“ã€‚ aptã‚³ãƒžãƒ³ãƒ‰ã¯â€¦ äººé–“ãŒã‚³ãƒžãƒ³ãƒ‰ãƒ©ã‚¤ãƒ³ã‚’å©ãæ™‚ã«ä½¿ã†ãƒ•ãƒãƒ³ãƒˆã‚¨ãƒ³ãƒ‰ãªã‚¤ãƒ³ã‚¿ãƒ¼ãƒ•ã‚§ãƒ¼ã‚¹ã§ã‚ã‚‹ã¨ã•ã‚Œã¦ã„ã‚‹ãã†ã§ã™ã€‚ ãã®ãŸã‚ã«ã€ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã§æŒ™å‹•ãŒå¤‰ã‚ã‚‹ã‹ã‚‚ã¨ã‚‚æ˜Žç¢ºã«è¨˜è¼‰ã•ã‚Œã¦ã„ã¾ã™ã€‚ ã‚½ãƒ¼ã‚¹ã¯ man 8 apt http://manpages.ubuntu.com/manpages/bionic/man8/apt.8.html ã‚€ã—ã‚ã€ã‚·ã‚§ãƒ«ã‚¹ã‚¯ãƒªãƒ—ãƒˆã«ãŠã„ã¦ã¯ã€apt-getã‚³ãƒžãƒ³ãƒ‰ã‚’ä½¿ã†ã“ã¨ãŒæŽ¨å¥¨ã•ã‚Œã¦ã„ã¾ã™ã€‚ aptã‚³ãƒžãƒ³ãƒ‰ã¯ã‚¤ãƒ³ã‚¿ãƒ©ã‚¯ãƒ†ã‚£ãƒ–å‘ã‘ã¨ã‚ã‚‹ã®ã§ã€ãã‚Œã¯ãã†ã§ã™ã‚ˆãã€‚ Debian stretch ã«ãŠã„ã¦ã¯ã€‚å…¬å¼ãƒ‰ã‚ãƒ¥ãƒ¡ãƒ³ãƒˆå‚ç…§ https://www.debian.org/doc/m
ngyuki 2019/04/19
linux
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/etc/fstab ã«ã‚¹ãƒšãƒ¼ã‚¹ã‚’å«ã‚€ãƒ‘ã‚¹ã‚’æŒ‡å®šã—ãŸã„å ´åˆ \040 ã‚’ä½¿ã†
/etc/fstab ã«ã‚¹ãƒšãƒ¼ã‚¹ã‚’å«ã‚€ãƒ‘ã‚¹ã‚’æŒ‡å®šã—ãŸã„å ´åˆã¯ã§ \040 (8 é€²æ•°) ã§æŒ‡å®šã—ã¾ã™ã€‚ å˜ç´”ãªã‚¹ãƒšãƒ¼ã‚¹ã€Œ ã€ã‚„ãƒãƒƒã‚¯ã‚¹ãƒ©ãƒƒã‚·ãƒ¥ + ã‚¹ãƒšãƒ¼ã‚¹ã€Œ\ ã€ã§ã¯ã‚¨ãƒ©ãƒ¼ã«ãªã‚Šã¾ã™ã€‚ [natsu@centos53 ~]$ sudo cp -a /etc/fstab /etc/fstab.orig [natsu@centos53 ~]$ sudo vi /etc/fstab --- /etc/fstab.orig +++ /etc/fstab @@ -4,3 +4,4 @@ sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 LABEL=SWAP-sda2 swap swap defaults 0 0 +/dev/sdc1 /var/lib/vmware/Virtual\040Machines ext3 defaults
$/etc/fstab ã«ã‚¹ãƒšãƒ¼ã‚¹ã‚’å«ã‚€ãƒ‘ã‚¹ã‚’æŒ‡å®šã—ãŸã„å ´åˆ \040 ã‚’ä½¿ã†$
ngyuki 2019/04/09
linux
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bindfs
bindfs Mount a directory to another location and alter permission bits. bindfs is a FUSE filesystem for mounting a directory to another location, similarly to mount --bind. The permissions inside the mountpoint can be altered using various rules. Examples Here are some examples of what bindfs can do for you: Make a directory read-only for non-root users. bindfs --perms=a-w somedir somedir Share a
ngyuki 2019/04/06
mount --bind ã®ã‚ˆã†ã«ãƒ‡ã‚£ãƒ¬ã‚¯ãƒˆãƒªã‚’åˆ¥ã®å ´æ‰€ã«ãƒžã‚¦ãƒ³ãƒˆã—ã¤ã¤ãƒ‘ãƒ¼ãƒŸãƒƒã‚·ãƒ§ãƒ³ã‚„ã‚ªãƒ¼ãƒŠãƒ¼ã‚’å¤‰ãˆã¦è¦‹ã›ã‚‹ã‚„ã¤ã€‚FUSE ä½¿ã£ã¦ã‚‹ã¨ã®ã“ã¨

linux

wsl
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Have SystemD spawn N processes?
ngyuki 2019/03/23
systemd ã§ supervisord ã® numprocs ã¿ãŸã„ãªã®ã‚„ã‚‹æ–¹æ³•ã€ã‚„ã£ã±ã‚Šãƒ†ãƒ³ãƒ—ãƒ¬ãƒ¼ãƒˆãƒ¦ãƒ‹ãƒƒãƒˆã§ã‚„ã‚‹ã—ã‹ãªã•ãã†

linux

systemd
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Explanation of polkitd Unregistered Authentication Agent
ngyuki 2019/03/23
polkitd: Registered Authentication Agent for unix-process ã¿ãŸã„ãªãƒã‚°ã¯ç„¡è¦–ã—ã¦ OK ã¨ã®ã“ã¨ã‚‰ã—ã„

linux
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How can I find out about "rootfs"
Running Debian 7; when I execute a cat /etc/mtab I can see all sorts of useful information about the filesystems that are mounted, such as the filesystem and options used to mount then; however for the rootfs I see only: rootfs / rootfs rw 0 0 How can I know more about the rootfs; which physical device/partition was used, filesystem, mount options etc? On my system /etc/mtab is in fact a symbolic
ngyuki 2019/02/08
/proc/mounts ã«ã‚ã‚‹ rootfs ã«ã¤ã„ã¦ã€ãƒ–ãƒ¼ãƒˆæ™‚ã® ramfs ã¨ã®ã“ã¨

linux
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CentOS7/RHEL7 ã«ãŠã‘ã‚‹ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã®ãƒžã‚¦ãƒ³ãƒˆé †åºã‚’æŒ‡å®šã™ã‚‹æ–¹æ³• â€“ SIOS Tech. Lab
ã“ã‚“ã«ã¡ã¯ã€‚ã‚µã‚¤ã‚ªã‚¹ãƒ†ã‚¯ãƒŽãƒã‚¸ãƒ¼ OSS ã‚µãƒãƒ¼ãƒˆæ‹…å½“ä½•æ•æ¬½ã§ã™ã€‚ CentOS7/RHEL7 ã®ã‚·ã‚¹ãƒ†ãƒ ã«ãŠã„ã¦ã€ã¾ãš NFS ãƒžã‚¦ãƒ³ãƒˆã—ã¦ã€ãã®å¾Œã« NFS ãƒžã‚¦ãƒ³ãƒˆã—ãŸé ˜åŸŸã®ä¸ã®ãƒ‡ã‚£ãƒ¬ã‚¯ãƒˆãƒªã‚’ bind ãƒžã‚¦ãƒ³ãƒˆã—ãŸã„å ´åˆã¯ã©ã†è¨å®šã™ã‚Œã°ã„ã„ã§ã—ã‚‡ã†ã‹ã€‚ æ–¹æ³•ã¯äºŒã¤ã‚ã‚Šã¾ã™ã€‚/etc/fstab ã«ä¾å˜é–¢ä¿‚ã‚’è¿½è¨˜ã™ã‚‹ã‹ã€è‡ªå‹•ä½œæˆã•ã‚ŒãŸãƒžã‚¦ãƒ³ãƒˆ Unit ãƒ•ã‚¡ã‚¤ãƒ«ã‚’ /etc/systemd/system ã«ã‚³ãƒ”ãƒ¼ã™ã‚‹ã‹ã§ã™ã€‚ä¸‹è¨˜ã«ãžã‚Œãžã‚Œã‚’èª¬æ˜Žã—ã¾ã™ã€‚ 2019/1/7 è¿½è¨˜ï¼šä¸‹è¨˜ã«èª¬æ˜Žã™ã‚‹ã€Œ/etc/fstab ã«ä¾å˜é–¢ä¿‚ã‚’è¿½è¨˜ã™ã‚‹æ–¹æ³•ã€ã¨ã€Œãƒžã‚¦ãƒ³ãƒˆ Unit ãƒ•ã‚¡ã‚¤ãƒ«ã‚’ /etc/systemd/system ã«ã‚³ãƒ”ãƒ¼ã™ã‚‹æ–¹æ³•ã€ã«ã¤ã„ã¦ã€ä¸€éƒ¨ã®ã‚µãƒ¼ãƒ“ã‚¹ãŒèµ·å‹•ã—ãªããªã‚‹æã‚ŒãŒã‚ã‚‹ã“ã¨ã‚’åˆ¤æ˜Žã—ã¾ã—ãŸã€‚ãã®åŽŸå› ã¨è§£æ±ºæ–¹æ³•ã¯ã€Œ2019/1/7 è¿½è¨˜ï¼š_netdevå±žæ€§ã‚’ãƒžã‚¦ãƒ³ãƒˆã‚¨ãƒ³ãƒˆãƒªã«
ngyuki 2018/12/20
systemd ã ã¨ fstab ã« x-systemd.requires-mounts-for ã¨ã‹ãŒæ›¸ã‘ã‚‹ã¨ã®ã“ã¨

linux
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Creating a Linux service with systemd
Crafting your own services â€” Photo by Jeff Sheldon on UnsplashWhile writing web applications, I often need to offload compute-heavy tasks to an asynchronous worker script, schedule tasks for later, or even write a daemon that listens to a socket to communicate with clients directly. While there might sometimes be better tools for the job â€” always consider using existing software first, such as a t
ngyuki 2018/07/04
systemd ã§ã‚µãƒ¼ãƒ“ã‚¹ã‚’ç„¡é™ã«ãƒªãƒˆãƒ©ã‚¤ã™ã‚‹æ–¹æ³• StartLimitIntervalSec=0 ã¨ã‹ StartLimitAction=reboot ã¨ã‹

linux
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ngyuki 2018/06/21
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ngyuki 2018/06/13
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ngyuki 2018/03/09
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ngyuki 2018/03/04
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ngyuki 2018/02/08
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ngyuki 2018/01/25
linux
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