{"id":521,"date":"2018-08-27T22:21:44","date_gmt":"2018-08-27T19:21:44","guid":{"rendered":"https:\/\/blog.nav.ro\/?p=521"},"modified":"2019-03-21T11:02:39","modified_gmt":"2019-03-21T09:02:39","slug":"introducere-in-fisierele-de-jurnal-linux","status":"publish","type":"post","link":"https:\/\/www.nav.ro\/blog\/introducere-in-fisierele-de-jurnal-linux\/","title":{"rendered":"Introducere \u00een fi\u0219ierele de jurnal Linux"},"content":{"rendered":"<p>Un fi\u0219ier de jurnal, a\u0219a cum probabil a\u021bi ghicit, ofer\u0103 o cronologie a evenimentelor pentru sistemul de operare Linux, aplica\u021bii \u0219i servicii.<\/p>\n<p>Fi\u0219ierele sunt stocate \u00een text simplu pentru a fi u\u0219or de citit. Acest ghid ofer\u0103 o imagine de ansamblu a loca\u021biilor \u00een care se g\u0103sesc fi\u0219ierele de jurnal, eviden\u021biaz\u0103 c\u00e2teva din jurnalele cheie \u0219i explic\u0103 modul de citire a acestora.<\/p>\n<p>Unde pute\u021bi g\u0103\u0219i fi\u0219iere de jurnal \u00een Linux<\/p>\n<p>Fi\u0219ierele de jurnal din Linux sunt \u00een mod normal stocate \u00een folderul \/ var \/ logs.<\/p>\n<p>Dosarul con\u021bine un num\u0103r mare de fi\u0219iere \u0219i pute\u021bi ob\u021bine informa\u021bii pentru fiecare aplica\u021bie.<\/p>\n<p>De exemplu, atunci c\u00e2nd comanda ls este rulat\u0103 \u00eentr-un fi\u0219ier sample \/ var \/ logs sunt c\u00e2teva din jurnalele disponibile.<\/p>\n<p><code>kern.log<br \/>\nauth.log<br \/>\nbootstrap.log<br \/>\nalternatives.log<br \/>\nsamba<br \/>\ncupe<br \/>\nlightdm<\/code><\/p>\n<p>Ultimele trei din lista respectiv\u0103 sunt dosare, dar au fi\u0219iere de jurnal \u00een dosare.<\/p>\n<p>Deoarece fi\u0219ierele de jurnal sunt \u00een format text simplu, le pute\u021bi citi tast\u00e2nd urm\u0103toarea comand\u0103:<\/p>\n<p><code>nano <\/code><\/p>\n<p>Comanda de mai sus deschide fi\u0219ierul jurnal \u00eentr-un editor numit nano. Dac\u0103 fi\u0219ierul de jurnal este de dimensiuni mici, atunci este bine s\u0103 deschide\u021bi fi\u0219ierul jurnal \u0219i editorul, dar dac\u0103 fi\u0219ierul jurnal este mare, probabil c\u0103 sunte\u021bi interesat doar s\u0103 citi\u021bi cap\u0103tul din coada jurnalului.<\/p>\n<p>Comanda care v\u0103 permite s\u0103 citi\u021bi ultimele c\u00e2teva linii dintr-un fi\u0219ier este:<\/p>\n<p><code>tail <\/code><\/p>\n<p>Pute\u021bi specifica c\u00e2te linii s\u0103 afi\u0219a\u021bi cu comutatorul -n dup\u0103 cum urmeaz\u0103:<\/p>\n<p><code>tail -n <\/code><\/p>\n<p>Desigur, dac\u0103 dori\u021bi s\u0103 vede\u021bi \u00eenceputul fi\u0219ierului, pute\u021bi folosi comanda head.<\/p>\n<p>Registrele de baz\u0103 ale sistemului<\/p>\n<p>Urm\u0103toarele fi\u0219iere de jurnal sunt cele principale pe care trebuie s\u0103 le ave\u021bi \u00een vedere \u00een Linux.<\/p>\n<p><code>Authorisation Log<br \/>\nDaemon Log<br \/>\nDebug Log<br \/>\nKernel Log<br \/>\nSystem Log<\/code><\/p>\n<p>Jurnalul de autorizare (auth.log) urm\u0103re\u0219te utilizarea sistemelor de autorizare care controleaz\u0103 accesul utilizatorilor.<\/p>\n<p>Jurnalul daemon (daemon.log) urm\u0103re\u0219te serviciile care ruleaz\u0103 \u00een fundal, care efectueaz\u0103 sarcini importante. Demonii nu au nici o ie\u0219ire grafic\u0103.<\/p>\n<p>Jurnalul de depanare (debug.log) ofer\u0103 o informa\u021bii de depanare pentru aplica\u021bii.<\/p>\n<p>Jurnalul de kernel furnizeaz\u0103 detalii despre kernel-ul Linux.<\/p>\n<p>Jurnalul de sistem con\u021bine cele mai multe informa\u021bii despre sistemul dvs. \u0219i dac\u0103 aplica\u021bia dvs. nu are un jurnal propriu, intr\u0103rile vor fi probabil \u00een acest fi\u0219ier jurnal.<\/p>\n<p>Analizarea con\u021binutului unui fi\u0219ier de jurnal<\/p>\n<p>Imaginea de mai sus arat\u0103 con\u021binutul ultimelor 50 de fi\u0219iere din fi\u0219ierul log de sistem (syslog).<\/p>\n<p>Fiecare r\u00e2nd din jurnal con\u021bine urm\u0103toarele informa\u021bii:<\/p>\n<p>De exemplu, o singur\u0103 linie din fi\u0219ierul meu syslog are dup\u0103 cum urmeaz\u0103:<\/p>\n<p><code> Data<br \/>\nNumele gazdei<br \/>\nAplica\u021bie \/ Serviciu<br \/>\nMesaj<\/code><\/p>\n<p>jan 20 12:28:56 gary-virtualbox systemd[1]: starting cups scheduler<\/p>\n<p>Aceasta v\u0103 spune c\u0103 serviciul de planificare a fost \u00eenceput la ora 12.28 pe data de 20 ianuarie.<\/p>\n<p>Rota\u021bia jurnalelor<\/p>\n<p>Fi\u0219ierele jurnal se rotesc periodic, astfel \u00eenc\u00e2t s\u0103 nu devin\u0103 prea mari.<\/p>\n<p>Utilitarul pentru rotirea jurnalului este responsabil pentru rotirea fi\u0219ierelor jurnal. Pute\u021bi afla c\u00e2nd un jurnal a fost rotit, deoarece va fi urmat de un num\u0103r precum auth.log.1, auth.log.2.<\/p>\n<p>Este posibil\u0103 modificarea frecven\u021bei de rota\u021bie a jurnalului prin editarea fi\u0219ierului \/ etc \/ logrotate.conf<\/p>\n<p>Urm\u0103toarele exemple arat\u0103 o parte din fi\u0219ierul meu logrotate.conf:<\/p>\n<p><code>#rotate log files<br \/>\nweekly<\/code><\/p>\n<p><code>#keep 4 weeks worth of log files<br \/>\nrotate 4<\/code><\/p>\n<p><code>create new log files after rotating<br \/>\ncreate<\/code><\/p>\n<p>Dup\u0103 cum pute\u021bi vedea, aceste fi\u0219iere de jurnal se rotesc \u00een fiecare s\u0103pt\u0103m\u00e2n\u0103 \u0219i exist\u0103 un de fi\u0219iere de jurnale pentru patru s\u0103pt\u0103m\u00e2ni p\u0103strate \u00een orice moment.<\/p>\n<p>C\u00e2nd un fi\u0219ier jurnal se rote\u0219te, unul nou este creat \u00een locul s\u0103u.<\/p>\n<p>Fiecare aplica\u021bie poate avea propria politic\u0103 de rota\u021bie. Acest lucru este \u00een mod evident util, deoarece fi\u0219ierul syslog va cre\u0219te mai rapid dec\u00e2t fi\u0219ierul jurnal cups.<\/p>\n<p>Politicile de rota\u021bie sunt p\u0103strate \u00een \/etc\/logrotate.d. Fiecare aplica\u021bie care necesit\u0103 o politic\u0103 de rota\u021bie proprie va avea un fi\u0219ier de configurare \u00een acest folder.<\/p>\n<p>De exemplu, instrumentul apt are un fi\u0219ier \u00een folderul logrotate.d dup\u0103 cum urmeaz\u0103:<\/p>\n<p><code>\/var\/log\/apt\/history.log {<br \/>\nrotate 12<br \/>\nmonthly<br \/>\ncompress<br \/>\nmissingok<br \/>\nnotifempty<br \/>\n}<\/code><\/p>\n<p>Practic, acest jurnal v\u0103 spune urm\u0103toarele: Jurnalul va p\u0103stra fi\u0219ierele de jurnale pe o perioada de 12 s\u0103pt\u0103m\u00e2ni \u0219i se va roti \u00een fiecare lun\u0103 (1 pe lun\u0103). Fi\u0219ierul jurnal va fi comprimat. Dac\u0103 nu se scriu mesaje \u00een jurnal (adic\u0103 este gol), atunci este acceptabil. Jurnalul nu se rote\u0219te dac\u0103 este gol.<\/p>\n<p>Pentru a modific\u0103 politica unui fi\u0219ier, modifica\u021bi fi\u0219ierul cu set\u0103rile de care ave\u021bi nevoie \u0219i executa\u021bi urm\u0103toarea comand\u0103:<\/p>\n<p><code>logrotate -f<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un fi\u0219ier de jurnal, a\u0219a cum probabil a\u021bi ghicit, ofer\u0103 o cronologie a evenimentelor pentru sistemul de operare Linux, aplica\u021bii \u0219i servicii. Fi\u0219ierele sunt stocate \u00een text simplu pentru a fi u\u0219or de citit. Acest ghid ofer\u0103 o imagine de ansamblu a loca\u021biilor \u00een care se g\u0103sesc fi\u0219ierele de jurnal, eviden\u021biaz\u0103 c\u00e2teva din jurnalele cheie<\/p>\n","protected":false},"author":1,"featured_media":1154,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-521","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-how-to"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Introducere \u00een fi\u0219ierele de jurnal Linux - NAV.RO Blog<\/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:\/\/www.nav.ro\/blog\/introducere-in-fisierele-de-jurnal-linux\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Introducere \u00een fi\u0219ierele de jurnal Linux - NAV.RO Blog\" \/>\n<meta property=\"og:description\" content=\"Un fi\u0219ier de jurnal, a\u0219a cum probabil a\u021bi ghicit, ofer\u0103 o cronologie a evenimentelor pentru sistemul de operare Linux, aplica\u021bii \u0219i servicii. 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