{"id":2124,"date":"2024-11-07T11:45:57","date_gmt":"2024-11-07T08:45:57","guid":{"rendered":"https:\/\/www.beratarikan.com.tr\/?p=2124"},"modified":"2024-11-07T11:48:42","modified_gmt":"2024-11-07T08:48:42","slug":"zabbix-log-file-monitoring-ssh-login-trigger-on-linux","status":"publish","type":"post","link":"https:\/\/www.beratarikan.com.tr\/index.php\/2024\/11\/07\/zabbix-log-file-monitoring-ssh-login-trigger-on-linux\/","title":{"rendered":"Zabbix Log File Monitoring | SSH Login Trigger on Linux"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"2124\" class=\"elementor elementor-2124\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2966bcb e-flex e-con-boxed e-con e-parent\" data-id=\"2966bcb\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b68d5e3 elementor-widget elementor-widget-text-editor\" data-id=\"b68d5e3\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Merhabalar,<\/p><p>Uzun zamand\u0131r makale yazm\u0131yordum bu hafta sonu \u00e7ok fazla sorulan bir konuda\u00a0<strong>Zabbix Log File Monitoring<\/strong>\u00a0hakk\u0131nda k\u00fc\u00e7\u00fck bir makale haz\u0131rlad\u0131m. \u015eimdiden keyifli okumalar.<\/p><p>Log file i\u00e7erisindeki bir tan\u0131ma neden alarm yazmak isteriz \u00f6ncelikle bunu bir a\u00e7mak laz\u0131m;<\/p><p><strong>Windows<\/strong>\u00a0veya\u00a0<strong>Linux<\/strong>\u00a0sistemler \u00fczerlerinde \u00e7al\u0131\u015fan\u00a0<strong>servis<\/strong>\u00a0veya\u00a0<strong>process<\/strong>\u2019ler herhangi bir olay veya hata durumlar\u0131n\u0131 mutlaka bir Log dosyas\u0131na kaydederler ve bir iz d\u00fc\u015f\u00fcm\u00fc b\u0131rak\u0131rlar.<\/p><p>Log dosyas\u0131ndaki bir hata yada iz d\u00fc\u015f\u00fcm\u00fc bilgisi bize asl\u0131nda \u00e7ok \u00f6nemli bir durumun ger\u00e7ekle\u015fti\u011fini veya bilmek istedi\u011fimiz bir olay\u0131n bilgisini\u00a0<strong>verebilir<\/strong>, bu sebeple herhangi bir log dosyas\u0131n\u0131n i\u00e7erisindeki bir parametrenin yakalanmas\u0131 durumuna alarm almak isteyebiliriz.<\/p><p>Biz bu olay\u0131 daha anla\u015f\u0131l\u0131r k\u0131lmak ad\u0131na bir\u00a0<strong>Linux sunucu \u00fczerinde SSH ba\u011flant\u0131s\u0131<\/strong>\u00a0kurulmas\u0131 halinde alarm alarak olay\u0131 ger\u00e7ek hayat senaryosunda kurgulam\u0131\u015f olaca\u011f\u0131z.<\/p><p>Bu yakla\u015f\u0131m izleme \u00fcr\u00fcn\u00fcn\u00fc bir Cyber Security veya Loglama \u00fcr\u00fcn\u00fc yerine kullanmak anlam\u0131na gelmez. Biz olaya tamamen\u00a0<strong>izleme g\u00f6z\u00fc ile bakaca\u011f\u0131z<\/strong>.<\/p><p>Haydi ba\u015flayal\u0131m.<\/p><p>Hedef Sunucu: Oracle Linux 8,\u00a0<strong>Zabbix Agent2 Active Mod<\/strong>\u00a0ile izleniyor.<\/p><figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" class=\"wp-image-2290\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/1.png\" sizes=\"(max-width: 494px) 100vw, 494px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/1.png 494w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/1-300x241.png 300w\" alt=\"\" width=\"494\" height=\"397\" \/><\/figure><p>\u00d6ncelikle bu sunucu \u00fczerinde SSH ile ba\u011flant\u0131 kuruldu\u011funda bunun nereye log yazd\u0131\u011f\u0131n\u0131 bulmam\u0131z gerekiyor.<\/p><p><strong>\u201ctail -f\u00a0 \/var\/log\/secure\u201d<\/strong>\u00a0komutu ile kontrol etti\u011fimizde yap\u0131lan SSH ba\u011flant\u0131lar\u0131n\u0131n iz d\u00fc\u015f\u00fcmleri burada g\u00f6r\u00fcyoruz.<\/p><figure class=\"wp-block-image size-large\"><img class=\"wp-image-2291\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/2-1024x215.png\" sizes=\"(max-width: 1024px) 100vw, 1024px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/2-1024x215.png 1024w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/2-300x63.png 300w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/2-768x161.png 768w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/2-660x138.png 660w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/2.png 1174w\" alt=\"\" width=\"1024\" height=\"215\" \/><\/figure><p>Zabbix Agent ile bu dosya \u00fczerinden bir data okumak istiyorsak permission\u2019lara bakmak gerekiyor. A\u015fa\u011f\u0131daki gibi\u00a0<strong>\/var\/log\/secure<\/strong>\u00a0dosyas\u0131 i\u00e7in sadece\u00a0<strong>root<\/strong>\u00a0grubu ve\u00a0<strong>user<\/strong>\u2019\u0131 okuma ve yazma hakk\u0131na sahip olarak g\u00f6r\u00fcnt\u00fcl\u00fcyoruz.<\/p><figure class=\"wp-block-image size-full\"><img class=\"wp-image-2292\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/3.png\" sizes=\"(max-width: 703px) 100vw, 703px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/3.png 703w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/3-300x269.png 300w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/3-660x592.png 660w\" alt=\"\" width=\"703\" height=\"631\" \/><\/figure><p>A\u015fa\u011f\u0131daki g\u00f6rsel ve\u00a0<a href=\"https:\/\/remy.parkland.edu\/~smauney\/csc128\/permissions_and_links.html\" target=\"_blank\" rel=\"noreferrer noopener\">buradaki<\/a>\u00a0link bu izinlerin nas\u0131l verildi\u011fini anlatmaktad\u0131r.<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" class=\"wp-image-2293\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/4.png\" sizes=\"(max-width: 593px) 100vw, 593px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/4.png 593w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/4-300x214.png 300w\" alt=\"\" width=\"593\" height=\"423\" \/><\/figure><pre class=\"wp-block-code\"><code>sudo chgrp zabbix secure\n\nsudo chmod 640 secure<\/code><\/pre><div class=\"open_grepper_editor\" title=\"Edit &amp; Save To Grepper\">\u00a0<\/div><p>yukar\u0131daki komutlar\u0131 kullanarak\u00a0<strong>\/var\/log\/<\/strong>\u00a0alt\u0131ndaki secure isimli klas\u00f6re zabbix grubu i\u00e7in sadece okuma izni verildi.<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" class=\"wp-image-2294\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/5.png\" sizes=\"(max-width: 709px) 100vw, 709px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/5.png 709w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/5-263x300.png 263w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/5-660x752.png 660w\" alt=\"\" width=\"709\" height=\"808\" \/><\/figure><p>\u015eimdi bir Template haz\u0131rlama vakti.<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" class=\"wp-image-2295\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/6.png\" sizes=\"(max-width: 923px) 100vw, 923px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/6.png 923w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/6-300x153.png 300w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/6-768x391.png 768w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/6-660x336.png 660w\" alt=\"\" width=\"923\" height=\"470\" \/><\/figure><p><br \/>Item sekmesine gelerek\u00a0<strong>Create item<\/strong>\u00a0diyorum ve yeni bir item tan\u0131ml\u0131yorum.<\/p><figure class=\"wp-block-image size-large\"><img loading=\"lazy\" class=\"wp-image-2296\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/7-1024x249.png\" sizes=\"(max-width: 1024px) 100vw, 1024px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/7-1024x249.png 1024w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/7-300x73.png 300w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/7-768x186.png 768w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/7-1536x373.png 1536w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/7-660x160.png 660w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/7.png 1759w\" alt=\"\" width=\"1024\" height=\"249\" \/><\/figure><p><strong>Name:<\/strong>\u00a0SSH Logins<\/p><p><strong>Type:<\/strong>\u00a0Zabbix agent (active)<\/p><p><strong>Key:<\/strong>\u00a0log[\/var\/log\/secure,,,skip]<\/p><p><strong>Type of information:<\/strong>\u00a0Log<\/p><p><strong>Update interval:<\/strong>\u00a01s<\/p><p>Yukar\u0131daki gibi parametlerimi haz\u0131rl\u0131yorum ve item tan\u0131mlamam\u0131 tamaml\u0131yorum.<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" class=\"wp-image-2297\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/8.png\" sizes=\"(max-width: 796px) 100vw, 796px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/8.png 796w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/8-300x227.png 300w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/8-768x580.png 768w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/8-660x498.png 660w\" alt=\"\" width=\"796\" height=\"601\" \/><\/figure><p><br \/>Haz\u0131rlad\u0131\u011f\u0131m Template\u2019i hedef sunucuma ekliyorum.<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" class=\"wp-image-2298\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/9.png\" sizes=\"(max-width: 988px) 100vw, 988px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/9.png 988w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/9-300x49.png 300w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/9-768x125.png 768w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/9-660x108.png 660w\" alt=\"\" width=\"988\" height=\"161\" \/><\/figure><p><br \/>K\u0131sa bir s\u00fcre bekleyerek ve SSH Login Logout olarak Log dosyas\u0131nda yeni Log\u2019lar olu\u015fmas\u0131n\u0131 sa\u011fl\u0131yorum. A\u015fa\u011f\u0131daki gibi\u00a0<strong>Latest Data<\/strong>\u00a0ekran\u0131nda Log\u2019lar\u0131n geldi\u011fini g\u00f6r\u00fcnt\u00fcl\u00fcyorum.<\/p><figure class=\"wp-block-image size-large\"><img loading=\"lazy\" class=\"wp-image-2299\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/10-1024x254.png\" sizes=\"(max-width: 1024px) 100vw, 1024px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/10-1024x254.png 1024w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/10-300x74.png 300w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/10-768x190.png 768w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/10-1536x381.png 1536w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/10-660x164.png 660w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/10.png 1755w\" alt=\"\" width=\"1024\" height=\"254\" \/><\/figure><p>CLI ekran\u0131nda Log dosyas\u0131nda ne g\u00f6r\u00fcyorsam art\u0131k Zabbix taraf\u0131na bunlar\u0131 \u00e7ekebildim.<\/p><ul class=\"wp-block-list\"><li>May\u00a0 7 00:46:54 zbx-60-db sshd[4442]: Accepted password for root from 192.168.1.15 port 52432 ssh2<\/li><li>May\u00a0 7 00:46:54 zbx-60-db sshd[4442]: pam_unix(sshd:session): session opened for user root by (uid=0)<\/li><\/ul><figure class=\"wp-block-image size-large\"><img loading=\"lazy\" class=\"wp-image-2300\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/11-1024x409.png\" sizes=\"(max-width: 1024px) 100vw, 1024px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/11-1024x409.png 1024w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/11-300x120.png 300w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/11-768x307.png 768w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/11-660x264.png 660w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/11.png 1281w\" alt=\"\" width=\"1024\" height=\"409\" \/><\/figure><p>Ben sadece Accepted password yazan sat\u0131r\u0131 almak istiyorum zaten bu sat\u0131rda SSH ba\u011flant\u0131s\u0131na ait t\u00fcm bilgiler bulunuyor. Bunun i\u00e7in\u00a0<a href=\"https:\/\/www.zabbix.com\/documentation\/6.0\/en\/manual\/config\/items\/itemtypes\/zabbix_agent\" target=\"_blank\" rel=\"noreferrer noopener\">buradaki<\/a>\u00a0dok\u00fcmantasyonda 2. parametre olan &lt;regexp&gt; parametresine direkt olarak yakalamak istedi\u011fim parametrenin ba\u015flang\u0131c\u0131n\u0131 regex yaz\u0131m dilinde yazmam gerekiyor.<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" class=\"wp-image-2301\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/12.png\" sizes=\"(max-width: 948px) 100vw, 948px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/12.png 948w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/12-300x222.png 300w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/12-768x570.png 768w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/12-660x489.png 660w\" alt=\"\" width=\"948\" height=\"703\" \/><\/figure><p>Key de\u011ferimi\u00a0<strong>log[\/var\/log\/secure,\u201dAccepted.*\u201d,,,skip]<\/strong>\u00a0olacak \u015fekilde g\u00fcncelliyorum. Bu \u015fu demek oluyor yakalad\u0131\u011f\u0131m Log de\u011ferlerininden sadece ba\u015flang\u0131c\u0131\u00a0<strong>\u201cAccepted.*\u201d<\/strong>\u00a0olan sat\u0131r\u0131 Zabbix\u2019e ta\u015f\u0131m\u0131\u015f olaca\u011f\u0131z.<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" class=\"wp-image-2302\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/13.png\" sizes=\"(max-width: 789px) 100vw, 789px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/13.png 789w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/13-300x216.png 300w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/13-768x552.png 768w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/13-660x474.png 660w\" alt=\"\" width=\"789\" height=\"567\" \/><\/figure><p>A\u015fa\u011f\u0131daki gibi sadece k\u0131rm\u0131z\u0131 alan\u0131 \u00e7ekmek i\u00e7in bu de\u011fi\u015fikli\u011fi yapm\u0131\u015f olduk.<\/p><figure class=\"wp-block-image size-large\"><img loading=\"lazy\" class=\"wp-image-2303\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/14-1024x221.png\" sizes=\"(max-width: 1024px) 100vw, 1024px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/14-1024x221.png 1024w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/14-300x65.png 300w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/14-768x166.png 768w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/14-660x143.png 660w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/14.png 1097w\" alt=\"\" width=\"1024\" height=\"221\" \/><\/figure><p>Tekrar SSH Login ve Logout oluyorum ve yeni gelen datalara Latest Data panelinden bak\u0131yorum istedi\u011fimiz \u015fekilde d\u00fczeldi\u011fini g\u00f6r\u00fcyorum.<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" class=\"wp-image-2304\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/15.png\" sizes=\"(max-width: 919px) 100vw, 919px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/15.png 919w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/15-300x197.png 300w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/15-768x503.png 768w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/15-660x432.png 660w\" alt=\"\" width=\"919\" height=\"602\" \/><\/figure><p><br \/>Gelin \u015fimdi Zabbix\u2019in nimetlerinden faydalanmaya devam edelim ve\u00a0<strong>Preprocessing\u00a0<\/strong>sekmesinde gelen ham datay\u0131 i\u015fleyelim.<\/p><figure class=\"wp-block-image size-large\"><img loading=\"lazy\" class=\"wp-image-2305\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/16-1024x251.png\" sizes=\"(max-width: 1024px) 100vw, 1024px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/16-1024x251.png 1024w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/16-300x73.png 300w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/16-768x188.png 768w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/16-660x162.png 660w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/16.png 1103w\" alt=\"\" width=\"1024\" height=\"251\" \/><\/figure><p><br \/>Gelen datan\u0131n ba\u015f\u0131nda uzun bir tarih alan\u0131 vard\u0131 ben bunu da g\u00f6rmek istemiyorum ve bir sat\u0131r\u0131 al\u0131p\u00a0<a href=\"https:\/\/regex101.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">buradaki<\/a>\u00a0sitede onu pars etmek i\u00e7in minik bir Regex komutu yaz\u0131yorum. Gelen 1 sat\u0131rl\u0131k data\u2019da sadece Accepted k\u0131sm\u0131 dahil olacak \u015fekilde sonraki alan\u0131 parse ediyorum. (A\u015fa\u011f\u0131daki ye\u015fil alan\u0131)<\/p><figure class=\"wp-block-image size-large\"><img loading=\"lazy\" class=\"wp-image-2306\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/17-1024x301.png\" sizes=\"(max-width: 1024px) 100vw, 1024px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/17-1024x301.png 1024w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/17-300x88.png 300w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/17-768x226.png 768w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/17-660x194.png 660w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/17.png 1254w\" alt=\"\" width=\"1024\" height=\"301\" \/><\/figure><p>Bunu preprocessing alan\u0131na ekliyorum ve sonunda \\0 yaz\u0131yorum.<\/p><figure class=\"wp-block-image size-large\"><img loading=\"lazy\" class=\"wp-image-2307\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/18-1024x241.png\" sizes=\"(max-width: 1024px) 100vw, 1024px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/18-1024x241.png 1024w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/18-300x71.png 300w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/18-768x181.png 768w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/18-660x155.png 660w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/18.png 1110w\" alt=\"\" width=\"1024\" height=\"241\" \/><\/figure><p>A\u015fa\u011f\u0131daki gibi gelen datalar ad\u0131m ad\u0131m istedi\u011fim \u015fekilde d\u00f6n\u00fc\u015ft\u00fc ve daha sade bir hal ald\u0131.<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" class=\"wp-image-2308\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/19.png\" sizes=\"(max-width: 879px) 100vw, 879px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/19.png 879w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/19-300x204.png 300w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/19-768x522.png 768w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/19-660x448.png 660w\" alt=\"\" width=\"879\" height=\"597\" \/><\/figure><p>Data alma ve preprocessing i\u015flemleri bitti\u011fine g\u00f6re art\u0131k bu item i\u00e7in\u00a0<strong>trigger<\/strong>\u00a0tan\u0131mlayabiliriz. \u0130lgili item\u2019\u0131n \u00fczerine gelip\u00a0<strong>Create trigger<\/strong>\u00a0diyorum.<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" class=\"wp-image-2309\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/20.png\" sizes=\"(max-width: 641px) 100vw, 641px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/20.png 641w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/20-300x204.png 300w\" alt=\"\" width=\"641\" height=\"435\" \/><\/figure><p>Gelen data bir Log datas\u0131 olmas\u0131 sebebi ile kullanabilece\u011fim Trigger functionlara\u00a0<a href=\"https:\/\/www.zabbix.com\/documentation\/6.0\/en\/manual\/appendix\/functions\/string?hl=length\" target=\"_blank\" rel=\"noreferrer noopener\">bak\u0131yorum<\/a>. Do\u011fru trigger function kullanmazsak item datas\u0131 do\u011fru olarak gelse bile olu\u015fturaca\u011f\u0131m\u0131z trigger \u00e7al\u0131\u015fmayacakt\u0131r.<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" class=\"wp-image-2312\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/21-1.png\" sizes=\"(max-width: 1005px) 100vw, 1005px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/21-1.png 1005w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/21-1-300x115.png 300w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/21-1-768x294.png 768w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/21-1-660x253.png 660w\" alt=\"\" width=\"1005\" height=\"385\" \/><\/figure><p>Log datas\u0131na uygun olan\u00a0lenght (value) function bunun i\u00e7in uygun g\u00f6r\u00fcn\u00fcyor.<\/p><figure class=\"wp-block-image size-large\"><img loading=\"lazy\" class=\"wp-image-2313\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/22-1-1024x129.png\" sizes=\"(max-width: 1024px) 100vw, 1024px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/22-1-1024x129.png 1024w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/22-1-300x38.png 300w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/22-1-768x97.png 768w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/22-1-660x83.png 660w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/22-1.png 1506w\" alt=\"\" width=\"1024\" height=\"129\" \/><\/figure><p><strong>Name:<\/strong>\u00a0SSH Login has been detected !<\/p><p><strong>Severity:<\/strong>\u00a0High<\/p><p><strong>Expression:<\/strong>\u00a0length(last(\/Linux Log File Monitoring\/log[\/var\/log\/secure,\u201dAccepted.*\u201d,,,skip]))&gt;0<br \/>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 and<br \/>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 nodata(\/Linux Log File Monitoring\/log[\/var\/log\/secure,\u201dAccepted.*\u201d,,,skip],5m)=0<\/p><p><strong>Description:<\/strong>\u00a0{ITEM.LASTVALUE1}<\/p><p>Yukar\u0131daki gibi d\u00fczenliyorum. Burada and operat\u00f6r\u00fc ve nodata fonksiyonunu da kulland\u0131m; e\u011fer bir SSH Login giri\u015fi tespit edilirse alarm al\u0131nacak ve 5 dakika boyunca yeni bir data gelmez ise giri\u015f tespiti olmaz ise alarm clear olacak \u015fekilde yap\u0131land\u0131rd\u0131m. Sizler alarm\u0131\u00a0<strong>Allow Manuel Close<\/strong>\u00a0se\u00e7ene\u011fini se\u00e7erek nodata function\u2019u kullanmadan tek bir function ile de tan\u0131mlayabilirsiniz. Bu durumda alarm geldi\u011finde her bir alarm i\u00e7in manuel olarak kapatma yapman\u0131z gerekece\u011fini unutmay\u0131n.<\/p><figure class=\"wp-block-image size-large\"><img loading=\"lazy\" class=\"wp-image-2314\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/23-1024x814.png\" sizes=\"(max-width: 1024px) 100vw, 1024px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/23-1024x814.png 1024w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/23-300x239.png 300w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/23-768x611.png 768w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/23-660x525.png 660w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/23.png 1031w\" alt=\"\" width=\"1024\" height=\"814\" \/><\/figure><p>\u015eimdi alert ekran\u0131ndan alarm\u0131m\u0131z\u0131 kontrol edelim. Problem Name alan\u0131n\u0131n sa\u011f alt k\u0131sm\u0131ndaki minik \u201c?\u201d k\u0131sm\u0131na\u00a0<strong>{ITEM.LASTVALUE1}<\/strong>\u00a0trigger de\u011ferinden gelen son datay\u0131 da gelmi\u015f olarak g\u00f6r\u00fcyoruz her\u015fey istedi\u011fimiz gibi \u00e7al\u0131\u015f\u0131yor. Bunu yazmamdaki ama\u00e7 ihtiya\u00e7 halinde Media Type i\u00e7erisinde de g\u00f6sterebilmek.<\/p><figure class=\"wp-block-image size-large\"><img loading=\"lazy\" class=\"wp-image-2315\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/24-1024x342.png\" sizes=\"(max-width: 1024px) 100vw, 1024px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/24-1024x342.png 1024w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/24-300x100.png 300w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/24-768x256.png 768w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/24-660x220.png 660w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/24.png 1228w\" alt=\"\" width=\"1024\" height=\"342\" \/><\/figure><p>Aradan 5 dakika kadar bir s\u00fcre ge\u00e7ti\u011finde ise alarm\u0131n kendili\u011finden Resolve oldu\u011funu g\u00f6r\u00fcnt\u00fcl\u00fcyorum.<\/p><figure class=\"wp-block-image size-large\"><img loading=\"lazy\" class=\"wp-image-2316\" data-data-src=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/25-1024x286.png\" sizes=\"(max-width: 1024px) 100vw, 1024px\" data-data-srcset=\"https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/25-1024x286.png 1024w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/25-300x84.png 300w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/25-768x214.png 768w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/25-660x184.png 660w, https:\/\/www.suleymankaratas.net\/wp-content\/uploads\/2023\/05\/25.png 1419w\" alt=\"\" width=\"1024\" height=\"286\" \/><\/figure><p>Bir makalenin daha sonuna geldik umar\u0131m faydal\u0131 bir i\u00e7erik olmu\u015ftur.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Merhabalar, Uzun zamand\u0131r makale yazm\u0131yordum bu hafta sonu \u00e7ok fazla sorulan bir konuda\u00a0Zabbix Log File Monitoring\u00a0hakk\u0131nda k\u00fc\u00e7\u00fck bir makale haz\u0131rlad\u0131m. \u015eimdiden keyifli okumalar. Log file i\u00e7erisindeki bir tan\u0131ma neden alarm yazmak isteriz \u00f6ncelikle bunu bir a\u00e7mak laz\u0131m; Windows\u00a0veya\u00a0Linux\u00a0sistemler \u00fczerlerinde \u00e7al\u0131\u015fan\u00a0servis\u00a0veya\u00a0process\u2019ler herhangi bir olay veya hata durumlar\u0131n\u0131 mutlaka bir Log dosyas\u0131na kaydederler ve bir iz d\u00fc\u015f\u00fcm\u00fc <\/p>\n","protected":false},"author":1,"featured_media":2073,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-2124","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-zabbix"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.7 (Yoast SEO v23.7) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Zabbix Log File Monitoring | SSH Login Trigger on Linux - Berat ARIKAN<\/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.beratarikan.com.tr\/index.php\/2024\/11\/07\/zabbix-log-file-monitoring-ssh-login-trigger-on-linux\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Zabbix Log File Monitoring | SSH Login Trigger on Linux\" \/>\n<meta property=\"og:description\" content=\"Merhabalar, Uzun zamand\u0131r makale yazm\u0131yordum bu hafta sonu \u00e7ok fazla sorulan bir konuda\u00a0Zabbix Log File Monitoring\u00a0hakk\u0131nda k\u00fc\u00e7\u00fck bir makale haz\u0131rlad\u0131m. \u015eimdiden keyifli okumalar. Log file i\u00e7erisindeki bir tan\u0131ma neden alarm yazmak isteriz \u00f6ncelikle bunu bir a\u00e7mak laz\u0131m; Windows\u00a0veya\u00a0Linux\u00a0sistemler \u00fczerlerinde \u00e7al\u0131\u015fan\u00a0servis\u00a0veya\u00a0process\u2019ler herhangi bir olay veya hata durumlar\u0131n\u0131 mutlaka bir Log dosyas\u0131na kaydederler ve bir iz d\u00fc\u015f\u00fcm\u00fc\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.beratarikan.com.tr\/index.php\/2024\/11\/07\/zabbix-log-file-monitoring-ssh-login-trigger-on-linux\/\" \/>\n<meta property=\"og:site_name\" content=\"Berat ARIKAN\" \/>\n<meta property=\"article:published_time\" content=\"2024-11-07T08:45:57+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-11-07T08:48:42+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.beratarikan.com.tr\/wp-content\/uploads\/2023\/04\/install-and-configure-zabbix.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"1920\" \/>\n\t<meta property=\"og:image:height\" content=\"1080\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"berat.arikan\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Yazan:\" \/>\n\t<meta name=\"twitter:data1\" content=\"berat.arikan\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tahmini okuma s\u00fcresi\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 dakika\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.beratarikan.com.tr\/index.php\/2024\/11\/07\/zabbix-log-file-monitoring-ssh-login-trigger-on-linux\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.beratarikan.com.tr\/index.php\/2024\/11\/07\/zabbix-log-file-monitoring-ssh-login-trigger-on-linux\/\"},\"author\":{\"name\":\"berat.arikan\",\"@id\":\"https:\/\/www.beratarikan.com.tr\/#\/schema\/person\/eac1fe0ed03fd8823a3d4e510cde7e75\"},\"headline\":\"Zabbix Log File Monitoring | SSH Login Trigger on Linux\",\"datePublished\":\"2024-11-07T08:45:57+00:00\",\"dateModified\":\"2024-11-07T08:48:42+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.beratarikan.com.tr\/index.php\/2024\/11\/07\/zabbix-log-file-monitoring-ssh-login-trigger-on-linux\/\"},\"wordCount\":1002,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.beratarikan.com.tr\/#\/schema\/person\/eac1fe0ed03fd8823a3d4e510cde7e75\"},\"image\":{\"@id\":\"https:\/\/www.beratarikan.com.tr\/index.php\/2024\/11\/07\/zabbix-log-file-monitoring-ssh-login-trigger-on-linux\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.beratarikan.com.tr\/wp-content\/uploads\/2023\/04\/install-and-configure-zabbix.webp\",\"articleSection\":[\"ZABB\u0130X\"],\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.beratarikan.com.tr\/index.php\/2024\/11\/07\/zabbix-log-file-monitoring-ssh-login-trigger-on-linux\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.beratarikan.com.tr\/index.php\/2024\/11\/07\/zabbix-log-file-monitoring-ssh-login-trigger-on-linux\/\",\"url\":\"https:\/\/www.beratarikan.com.tr\/index.php\/2024\/11\/07\/zabbix-log-file-monitoring-ssh-login-trigger-on-linux\/\",\"name\":\"Zabbix Log File Monitoring | SSH Login Trigger on Linux - 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