{"id":1293,"date":"2021-10-15T15:41:25","date_gmt":"2021-10-15T14:41:25","guid":{"rendered":"http:\/\/www.bocciolesi.fr\/tutoriels-et-cours\/?p=1293"},"modified":"2022-09-13T13:50:20","modified_gmt":"2022-09-13T12:50:20","slug":"troubleshooting-linux","status":"publish","type":"post","link":"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/troubleshooting-linux\/","title":{"rendered":"Diagnostics Serveurs Linux &#8211; TroubleShooting"},"content":{"rendered":"<div class=\"pdfprnt-buttons pdfprnt-buttons-post pdfprnt-top-right\"><a href=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-json\/wp\/v2\/posts\/1293?print=pdf\" class=\"pdfprnt-button pdfprnt-button-pdf\" target=\"_blank\"><img decoding=\"async\" src=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/plugins\/pdf-print\/images\/pdf.png\" alt=\"image_pdf\" title=\"Afficher le PDF\" \/><span class=\"pdfprnt-button-title pdfprnt-button-pdf-title\">Enregistrer en PDF<\/span><\/a><a href=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-json\/wp\/v2\/posts\/1293?print=print\" class=\"pdfprnt-button pdfprnt-button-print\" target=\"_blank\"><\/a><\/div><p><strong><span style=\"color: #3366ff;\">I\u25ba Linux dispose de nombreux outils disponibles pour essayer de comprendre pourquoi le serveur ralentit, semble bloqu\u00e9 sur certaines transactions &#8230;<\/span><\/strong><\/p>\n<p>La commande top ou htop indiquera quel process sont les plus gourmands en cpu et en utilisation m\u00e9moire.<\/p>\n<p><a href=\"https:\/\/www.mb-creation-web.fr\/tutoriels-et-cours\/wp-content\/uploads\/2014\/10\/Capture.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1294\" src=\"https:\/\/www.mb-creation-web.fr\/tutoriels-et-cours\/wp-content\/uploads\/2014\/10\/Capture.png\" alt=\"Capture\" width=\"648\" height=\"188\" srcset=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2014\/10\/Capture.png 648w, https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2014\/10\/Capture-300x87.png 300w, https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2014\/10\/Capture-624x181.png 624w\" sizes=\"auto, (max-width: 648px) 100vw, 648px\" \/><\/a><\/p>\n<p>wa indique le i\/o waiting, il faut donc le surveiller avec pr\u00e9cision &#8230;<\/p>\n<p>On va t\u00e9l\u00e9charger le script de stress sur\u00a0<a title=\"Linux Tools\" href=\"http:\/\/bocciolesi.fr\/linux-tools\/\" target=\"_blank\" rel=\"noopener noreferrer\">https:\/\/www.mb-creation-web.fr\/linux-tools\/\u00a0<\/a>\u00a0Ce script permet de stresser soit la cpu, les I\/O , etc &#8230;<br \/>\nExemple : <strong>stress &#8211;io 1000<\/strong> ou <strong>stress &#8211;cpu 10<\/strong><\/p>\n<p>Et ensuite \u00e9xecuter la commande iostat pour identifier quel device est en cause &#8230;<br \/>\n<strong>iostat -x<\/strong> ( rapport d\u00e9taill\u00e9) <strong>2<\/strong> (refresh toutes les 2 secondes) <strong>5<\/strong> (5 tests en tout)<br \/>\nNe tenez pas compte du 1er r\u00e9sultat &#8230;<br \/>\niostat indique le % d&#8217;occupation des I\/O par device mais bien plus encore :<br \/>\nDes \u00e9l\u00e9ments \u00e9galement tels que lecture et \u00e9criture des requ\u00eates par millisecondes (rrqm \/ s et wrqm \/ s), lecture et \u00e9criture par seconde (r \/ s &amp; w \/ s)<\/p>\n<p><a href=\"https:\/\/www.mb-creation-web.fr\/tutoriels-et-cours\/wp-content\/uploads\/2014\/10\/Capture1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1299\" src=\"https:\/\/www.mb-creation-web.fr\/tutoriels-et-cours\/wp-content\/uploads\/2014\/10\/Capture1.png\" alt=\"Capture\" width=\"876\" height=\"495\" srcset=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2014\/10\/Capture1.png 876w, https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2014\/10\/Capture1-300x169.png 300w, https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2014\/10\/Capture1-624x352.png 624w\" sizes=\"auto, (max-width: 876px) 100vw, 876px\" \/><\/a><\/p>\n<p>Mais pour avoir encore plus de d\u00e9tail sur les processus qui p\u00e9nalisent les I\/O, on va installer IoTop<br \/>\nyum install iotop ou apt-get install iotop :<\/p>\n<p><a href=\"https:\/\/www.mb-creation-web.fr\/tutoriels-et-cours\/wp-content\/uploads\/2014\/10\/Capture2.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1302\" src=\"https:\/\/www.mb-creation-web.fr\/tutoriels-et-cours\/wp-content\/uploads\/2014\/10\/Capture2.png\" alt=\"Capture\" width=\"910\" height=\"237\" srcset=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2014\/10\/Capture2.png 910w, https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2014\/10\/Capture2-300x78.png 300w, https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2014\/10\/Capture2-624x162.png 624w\" sizes=\"auto, (max-width: 910px) 100vw, 910px\" \/><\/a><\/p>\n<p><strong>TID<\/strong> est le <strong>THREAD<\/strong> <strong>ID<\/strong>, le kernel ne fait pas de diff\u00e9rences entre le PID et le TID &#8230;<\/p>\n<p>Les processus qui sont en attente d&#8217;I\/O sont souvent dans un \u00e9tat de \u00absommeil sans interruption&#8221; ou D.<\/p>\n<pre><code>PROCESS STATE CODES\r\n D uninterruptible sleep (usually IO)\r\n R running or runnable (on run queue)\r\n S interruptible sleep (waiting for an event to complete)\r\n T stopped, either by a job control signal or because it is being traced.\r\n W paging (not valid since the 2.6.xx kernel)\r\n X dead (should never be seen)\r\n Z defunct (\"zombie\") process, terminated but not reaped by its parent.<\/code><\/pre>\n<p>Voil\u00e0 une petite m\u00e9thode \ud83d\ude42 qui permet de les identifier :<\/p>\n<p><a href=\"https:\/\/www.mb-creation-web.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/Capture.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1308\" src=\"https:\/\/www.mb-creation-web.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/Capture.png\" alt=\"Capture\" width=\"966\" height=\"389\" srcset=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/Capture.png 966w, https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/Capture-300x120.png 300w, https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/Capture-624x251.png 624w\" sizes=\"auto, (max-width: 966px) 100vw, 966px\" \/><\/a><\/p>\n<p>Apr\u00e8s avoir identifi\u00e9 le processus I\/O qui ralentit le syst\u00e8me, on peut :<\/p>\n<ul>\n<li><span style=\"color: #3366ff;\"><strong><span style=\"font-size: 1rem; line-height: 1.714285714;\">Observer ses acc\u00e8s lecture et \u00e9criture avec un cat \/proc\/31114\/io\u00a0<\/span><\/strong><\/span><\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.mb-creation-web.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/Capture1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1310\" src=\"https:\/\/www.mb-creation-web.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/Capture1.png\" alt=\"Capture\" width=\"316\" height=\"135\" srcset=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/Capture1.png 316w, https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/Capture1-300x128.png 300w\" sizes=\"auto, (max-width: 316px) 100vw, 316px\" \/><\/a><\/p>\n<ul>\n<li><span style=\"color: #3366ff;\"><strong><span style=\"font-size: 1rem; line-height: 1.714285714;\">le renicer gr\u00e2ce \u00e0 <\/span>ionice<span style=\"font-size: 1rem; line-height: 1.714285714;\"> :<\/span><\/strong><\/span><\/li>\n<\/ul>\n<p>ionice r\u00e9cup\u00e8re ou met \u00e0 jour la priorit\u00e9 d&#8217;une transaction I\/O<\/p>\n<p><strong>ionice -c<\/strong> (class : 0 rien &#8211; 1 real time &#8211; 2 best effort et <strong>3 idle<\/strong>) -p (pid) 31114<\/p>\n<ul>\n<li><span style=\"color: #3366ff;\"><strong>Voir tous les fichiers ouverts \u00e0 cause de ce processus avec lsof -p 31114<\/strong><\/span><\/li>\n<\/ul>\n<p><span style=\"line-height: 24px;\"><a href=\"https:\/\/www.mb-creation-web.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/Capture2.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1311\" src=\"https:\/\/www.mb-creation-web.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/Capture2.png\" alt=\"Capture\" width=\"606\" height=\"205\" srcset=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/Capture2.png 606w, https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/Capture2-300x101.png 300w\" sizes=\"auto, (max-width: 606px) 100vw, 606px\" \/><\/a><\/span><\/p>\n<ul>\n<li><span style=\"color: #3366ff;\"><strong><span style=\"line-height: 1.714285714; font-size: 1rem;\">le stopper (pauser) avec un kill -18 31114 et le red\u00e9marrer plus tar avec un kill -19 31114 &#8230;<\/span><\/strong><\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>TP :<\/p>\n<p><a href=\"https:\/\/www.mb-creation-web.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/Capture3.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1313\" src=\"https:\/\/www.mb-creation-web.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/Capture3.png\" alt=\"Capture\" width=\"643\" height=\"363\" srcset=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/Capture3.png 643w, https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/Capture3-300x169.png 300w, https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/Capture3-624x352.png 624w\" sizes=\"auto, (max-width: 643px) 100vw, 643px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-<\/p>\n<h1><span style=\"color: #800080;\">Limiter le nombre de processus cr\u00e9\u00e9s avec ULIMIT et PAM :<\/span><\/h1>\n<p>Un exemple de FORK BOMB :<\/p>\n<p><a href=\"https:\/\/www.mb-creation-web.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/forkBomb.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1409\" src=\"https:\/\/www.mb-creation-web.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/forkBomb.png\" alt=\"forkBomb\" width=\"307\" height=\"92\" srcset=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/forkBomb.png 307w, https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/forkBomb-300x89.png 300w\" sizes=\"auto, (max-width: 307px) 100vw, 307px\" \/><\/a><\/p>\n<p>C&#8217;est la fonction 2 point \u00a0qui entre accolades \u00e9x\u00e9cute la fonction 2 point ou bien 2 points en job.<br \/>\nLe point virgule termine la 1\u00e8re commande et on appelle la fonction 2 points une 1\u00e8re fois.<\/p>\n<p><span style=\"color: #3366ff;\"><strong>PAM g\u00e8re tout ce qui concerne la s\u00e9curit\u00e9 par le fichier de configuration : <span style=\"color: #ff0000;\">\/etc\/security\/limits.conf<\/span>. <\/strong><span style=\"color: #999999;\">Pour rappel, les share objects de Pam sont sous <strong><span style=\"color: #ff0000;\">\/lib64\/security<\/span><\/strong> et les fichiers qui contiennent les r\u00e8gles sous <strong><span style=\"color: #ff0000;\">\/etc\/pam.d<\/span><\/strong><\/span><\/span><br \/>\nCe fichier d\u00e9finit des limites soft et hard en d\u00e9finissant :<\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><span style=\"line-height: 1.71429; font-size: 1rem;\">un domain : user (tux) | groupe (@linux) | * (tout le monde)<\/span><\/li>\n<li>un type de limite : soft ou hard<\/li>\n<li>un item : data | maxlogins | nproc (nombre max de process) | fsize etc ..<\/li>\n<li>la valeur<\/li>\n<\/ul>\n<p>Exemple :<\/p>\n<p><a href=\"https:\/\/www.mb-creation-web.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/Capture4.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1410\" src=\"https:\/\/www.mb-creation-web.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/Capture4.png\" alt=\"Capture\" width=\"693\" height=\"479\" srcset=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/Capture4.png 693w, https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/Capture4-300x207.png 300w, https:\/\/bocciolesi.fr\/tutoriels-et-cours\/wp-content\/uploads\/2013\/10\/Capture4-624x431.png 624w\" sizes=\"auto, (max-width: 693px) 100vw, 693px\" \/><\/a><\/p>\n<ul>\n<li><span style=\"line-height: 1.71429; font-size: 1rem;\">Les limites soft peuvent \u00eatre d\u00e9pass\u00e9es.<\/span><\/li>\n<li><span style=\"line-height: 1.71429; font-size: 1rem;\">Les limites hard sont les limites que l&#8217;on ne pourra pas d\u00e9passer &#8230;<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #ff0000;\"><strong>\u25ba ULIMIT<\/strong> <\/span>modifie ces directives \u00e9galement mais cela reste temporaire le temps de la session<\/p>\n<p><strong><span style=\"color: #ff0000;\">\u25baulimit -u 10<\/span><\/strong> limitera \u00e0 10 le nombre de processus lanc\u00e9s par un utilisateur<br \/>\nOn pourra v\u00e9rifier cet indicateur avec<strong><span style=\"color: #ff0000;\"> ulimit -u<\/span><\/strong> ou <strong><span style=\"color: #ff0000;\">ulimit -a<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>I\u25ba Linux dispose de nombreux outils disponibles pour essayer de comprendre pourquoi le serveur ralentit, semble bloqu\u00e9 sur certaines transactions &#8230; La commande top ou htop indiquera quel &#8230;<\/p>\n","protected":false},"author":1,"featured_media":1541,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,34,39],"tags":[],"class_list":["post-1293","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux","category-linux-admin","category-tutoriels"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Diagnostics Serveurs Linux - TroubleShooting - Tutoriels et Cours<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/bocciolesi.fr\/tutoriels-et-cours\/troubleshooting-linux\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Diagnostics Serveurs Linux - TroubleShooting - Tutoriels et Cours\" \/>\n<meta property=\"og:description\" content=\"I\u25ba Linux dispose de nombreux outils disponibles pour essayer de comprendre pourquoi le serveur ralentit, semble bloqu\u00e9 sur certaines transactions &#8230; 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