{"id":15997,"date":"2024-08-04T01:32:33","date_gmt":"2024-08-03T22:02:33","guid":{"rendered":"https:\/\/www.itpiran.net\/blog\/?p=15997"},"modified":"2024-08-04T01:32:33","modified_gmt":"2024-08-03T22:02:33","slug":"security-ubuntu-settings-firewall-tools","status":"publish","type":"post","link":"https:\/\/www.itpiran.net\/blog\/tr\/tutorials\/security-ubuntu-settings-firewall-tools\/","title":{"rendered":"Ubuntu sunucunuzu nas\u0131l g\u00fcvenli tutabilirsiniz?"},"content":{"rendered":"<h2 id=\"%d9%85%d9%82%d8%af%d9%85%d9%87\">girii\u015f<\/h2>\n<p>\u0130lk sunucular\u0131m\u0131 hat\u0131rl\u0131yorum. K\u00f6t\u00fc niyetli birinin sunucuma eri\u015febilece\u011fini d\u00fc\u015f\u00fcnmedi\u011fim i\u00e7in onlar\u0131 g\u00fcvence alt\u0131na almak i\u00e7in neredeyse hi\u00e7bir \u015fey yapmam\u0131\u015ft\u0131m. Ve bunun nas\u0131l sonu\u00e7land\u0131\u011f\u0131n\u0131 tahmin edebilirsiniz. Neyse ki yedeklerim vard\u0131 ve kolayca geri y\u00fckleyebiliyordum. Ama yine ayn\u0131 \u015fey oldu. Bu sefer biraz ara\u015ft\u0131rma yapt\u0131m, \u00f6devimi yapt\u0131m ve sunucular\u0131m\u0131 daha g\u00fcvenli hale getirdim. Hacklenemez sunucu diye bir \u015fey olmad\u0131\u011f\u0131n\u0131 biliyorum, ancak size sunucunuzu nas\u0131l g\u00fcvende tutaca\u011f\u0131n\u0131z\u0131 ve \u00e7\u00f6kerse ne yapman\u0131z gerekti\u011fini g\u00f6sterece\u011fim.<\/p>\n<p>Temel kurulumla ba\u015flayaca\u011f\u0131z. Yeni bir sunucu olu\u015fturdu\u011funuzda ne yapman\u0131z gerekti\u011fini \u00f6\u011freneceksiniz. Ard\u0131ndan, d\u00fczenli kontroller yaparak sunucunuzu nas\u0131l koruyaca\u011f\u0131n\u0131z\u0131 ele alaca\u011f\u0131z. Son olarak, sunucunuz \u00e7\u00f6kt\u00fc\u011f\u00fcnde ne yapman\u0131z gerekti\u011fini \u00f6\u011freneceksiniz. Bu e\u011fitim sizi profesyonel bir sunucu y\u00f6neticisi yapmaz, \u00e7\u00fcnk\u00fc \u00e7ok fazla emek gerektirir ve ciddi bir i\u015ftir. Ama en az\u0131ndan hobi projelerinizi g\u00fcvende tutabilirsiniz.<\/p>\n<h5 id=\"%d9%be%db%8c%d8%b4-%d9%86%db%8c%d8%a7%d8%b2%d9%87%d8%a7\">\u00d6n ko\u015fullar<\/h5>\n<ul>\n<li>1 sunucu (\u00f6rne\u011fin Hetzner ile)<\/li>\n<\/ul>\n<h2 id=\"%d9%85%d8%b1%d8%ad%d9%84%d9%87-1-%d8%b1%d8%a7%d9%87-%d8%a7%d9%86%d8%af%d8%a7%d8%b2%db%8c-%d8%a7%d9%88%d9%84%db%8c%d9%87-%d9%88-%d8%a7%d9%85%d9%86%db%8c%d8%aa-%d8%a7%d9%88%d9%84%db%8c%d9%87\">Ad\u0131m 1 \u2013 \u0130lk Kurulum ve Temel G\u00fcvenlik<\/h2>\n<p>Sunucunuzu olu\u015fturduktan sonra, &quot;Ubuntu ile \u0130lk Sunucu Kurulumu&quot; e\u011fitimindeki 1&#039;den 5&#039;e kadar olan ad\u0131mlar\u0131 izleyin. E\u011fitimde \u015fu konular a\u00e7\u0131klanmaktad\u0131r:<\/p>\n<ul>\n<li>Sudo izinlerine sahip yeni bir kullan\u0131c\u0131 olu\u015fturun<\/li>\n<li>Bir SSH anahtar\u0131 ekleyin<\/li>\n<\/ul>\n<p>Ba\u011flant\u0131l\u0131 e\u011fitimin ilk 5 ad\u0131m\u0131n\u0131 tamamlad\u0131ktan ve yeni sudo kullan\u0131c\u0131s\u0131na ba\u011fland\u0131ktan sonra a\u015fa\u011f\u0131daki ad\u0131mlarla devam edebilirsiniz.<\/p>\n<h2 id=\"%d8%a8%d9%87-%d8%b1%d9%88%d8%b2-%d8%b1%d8%b3%d8%a7%d9%86%db%8c-%d8%b3%db%8c%d8%b3%d8%aa%d9%85\">Sistem g\u00fcncellemesi<\/h2>\n<p>Yapman\u0131z gereken ilk \u015fey, g\u00fcncellemeleri kontrol etmektir; \u00e7\u00fcnk\u00fc g\u00fcncel olmayan yaz\u0131l\u0131mlar kolayca istismar edilebilecek g\u00fcvenlik a\u00e7\u0131klar\u0131na sahip olabilir. D\u00fc\u015f\u00fcnd\u00fc\u011f\u00fcn\u00fczden daha kolay; \u015fu iki komutu \u00e7al\u0131\u015ft\u0131rman\u0131z yeterli:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo apt update\r\nsudo apt upgrade<\/code><\/pre>\n<\/div>\n<p>Kolay, de\u011fil mi? Art\u0131k en son s\u00fcr\u00fcmleri kulland\u0131\u011f\u0131m\u0131zdan emin olduk.<\/p>\n<h2 id=\"%d8%af%d8%b3%d8%aa%d8%b1%d8%b3%db%8c-%d8%a7%d9%85%d9%86-%d8%a8%d9%87-ssh\">G\u00fcvenli SSH eri\u015fimi<\/h2>\n<p>Birisi sunucunuzu hedef ald\u0131\u011f\u0131nda, muhtemelen ilk deneyece\u011fi \u015fey SSH \u00fczerinden eri\u015fmek olacakt\u0131r. Bunu genellikle botlar ve \u00e7e\u015fitli y\u00f6ntemlerle yaparlar. Bu nedenle, SSH eri\u015fimini g\u00fcvence alt\u0131na almak \u00e7ok \u00f6nemlidir.<\/p>\n<p>Yap\u0131land\u0131rma dosyas\u0131n\u0131 d\u00fczenleyin:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo nano \/etc\/ssh\/sshd_config\r\n<\/code><\/pre>\n<\/div>\n<ul>\n<li>K\u00f6k eri\u015fimini devre d\u0131\u015f\u0131 b\u0131rak<\/li>\n<\/ul>\n<p>\u201cPermitRootLogin\u201d sat\u0131r\u0131n\u0131 bulun ve \u201cno\u201d olarak de\u011fi\u015ftirin.<\/p>\n<ul>\n<li>\u015eifre giri\u015fini devre d\u0131\u015f\u0131 b\u0131rak<\/li>\n<\/ul>\n<p>Yukar\u0131da \u00f6nerildi\u011fi gibi bir SSH anahtar\u0131 eklediyseniz, parola giri\u015fini devre d\u0131\u015f\u0131 b\u0131rakabilirsiniz.<\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>\u201cPasswordAuthentication\u201d\u0131 bulun ve \u201chay\u0131r\u201d olarak ayarlay\u0131n.<\/li>\n<li>\u201cPubkeyAuthentication\u201d\u0131 bulun ve \u201cEvet\u201d olarak ayarlay\u0131n.<\/li>\n<\/ul>\n<\/li>\n<li>Varsay\u0131lan SSH portunu de\u011fi\u015ftirin<\/li>\n<\/ul>\n<p>Sadece bunu de\u011fi\u015ftirerek, \u00e7o\u011fu otomatik bot sald\u0131r\u0131s\u0131n\u0131n \u00f6n\u00fcne ge\u00e7ebiliriz, \u00e7\u00fcnk\u00fc bunlar\u0131n \u00e7o\u011fu sahte botlard\u0131r ve SSH&#039;ye 22 numaral\u0131 porttan eri\u015fmeye \u00e7al\u0131\u015f\u0131rlar.<\/p>\n<p>\u201c#Port 22\u201d sat\u0131r\u0131n\u0131 bulun ve bunu \u201cPort 2222\u201d gibi bir \u015feye de\u011fi\u015ftirin (veya 2222\u2019yi istedi\u011finiz herhangi bir \u015feyle de\u011fi\u015ftirin).<\/p>\n<p>De\u011fi\u015fiklikleri kaydedin ve portun ba\u015far\u0131yla de\u011fi\u015ftirilip de\u011fi\u015ftirilmedi\u011fini kontrol edin:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo systemctl restart ssh.service\r\nsudo systemctl status ssh<\/code><\/pre>\n<\/div>\n<p>Sunucunun :: port 2222&#039;de dinleme yapt\u0131\u011f\u0131ndan emin olun.<\/p>\n<p>2222 portu belirtilmi\u015fse, sunucuya olan ba\u011flant\u0131y\u0131 sonland\u0131rmak ve yeni porta olan ba\u011flant\u0131n\u0131n \u00e7al\u0131\u015f\u0131p \u00e7al\u0131\u015fmad\u0131\u011f\u0131n\u0131 kontrol etmek i\u00e7in a\u015fa\u011f\u0131dakini \u00e7al\u0131\u015ft\u0131rabilirsiniz:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>ssh -p 2222 holu@&lt;203.0.113.1&gt;\r\n<\/code><\/pre>\n<\/div>\n<p>Belirledi\u011finiz porta ba\u011flanabiliyorsan\u0131z e\u011fitime devam edebilirsiniz.<\/p>\n<h2 id=\"%db%8c%da%a9-%d9%81%d8%a7%db%8c%d8%b1%d9%88%d8%a7%d9%84-%d8%b1%d8%a7-%d9%be%db%8c%da%a9%d8%b1%d8%a8%d9%86%d8%af%db%8c-%da%a9%d9%86%db%8c%d8%af\">Bir g\u00fcvenlik duvar\u0131 yap\u0131land\u0131r\u0131n<\/h2>\n<p>G\u00fcvenlik duvar\u0131 kurallar\u0131n\u0131 y\u00f6netmek i\u00e7in &quot;ufw&quot; kullanaca\u011f\u0131z. Kullan\u0131m\u0131 kolay olacak \u015fekilde tasarlanm\u0131\u015ft\u0131r ve komut sat\u0131r\u0131 aray\u00fcz\u00fc kullan\u0131r. Ufw muhtemelen sisteminizde zaten y\u00fckl\u00fcd\u00fcr, ancak y\u00fckl\u00fc oldu\u011fundan emin olmak i\u00e7in \u015fu komutu \u00e7al\u0131\u015ft\u0131rabilirsiniz:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo apt install ufw\r\n<\/code><\/pre>\n<\/div>\n<p>Ard\u0131ndan, di\u011fer kurallar taraf\u0131ndan \u00f6zellikle izin verilmedik\u00e7e t\u00fcm gelen a\u011f trafi\u011fini reddedece\u011fiz. Bu, yaln\u0131zca a\u00e7\u0131k\u00e7a izin verdi\u011finiz trafi\u011fe izin vererek sunucunuzun g\u00fcvenli\u011fini sa\u011flamak i\u00e7in \u00f6nemlidir. \u015eu komutu \u00e7al\u0131\u015ft\u0131rman\u0131z gerekecek:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo ufw default deny incoming\r\n<\/code><\/pre>\n<\/div>\n<p>Ard\u0131ndan, t\u00fcm giden a\u011f trafi\u011fine izin veriyoruz. Bu genellikle g\u00fcvenlidir ve sunucunuzun di\u011fer sunucular veya hizmetlerle k\u0131s\u0131tlama olmaks\u0131z\u0131n ileti\u015fim kurmas\u0131n\u0131 sa\u011flar. \u015eu komutu \u00e7al\u0131\u015ft\u0131r\u0131n:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo ufw default allow outgoing\r\n<\/code><\/pre>\n<\/div>\n<p>\u015eimdi SSH portumuzun sunucumuza SSH \u00fczerinden ba\u011flanmas\u0131na izin vermemiz gerekiyor. Ba\u015fka bir \u015fey belirttiyseniz, 2222&#039;yi SSH portunuzla de\u011fi\u015ftirdi\u011finizden emin olun ve \u015fu komutu \u00e7al\u0131\u015ft\u0131r\u0131n:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo ufw allow 2222\/tcp\r\n<\/code><\/pre>\n<\/div>\n<p>Son olarak g\u00fcvenlik duvar\u0131 kurallar\u0131m\u0131z\u0131 etkinle\u015ftirmemiz gerekiyor:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo ufw enable\r\n<\/code><\/pre>\n<\/div>\n<h2 id=\"fail2ban\">Fail2Ban<\/h2>\n<p>SSH portumuzu de\u011fi\u015ftirdik ve g\u00fcvenlik duvar\u0131m\u0131z\u0131 kurduk. Peki ya bir bot portumuzu bulup yine de sunucumuza SSH \u00fczerinden eri\u015fmeye \u00e7al\u0131\u015f\u0131rsa ne olur? Bu bir kaba kuvvet sald\u0131r\u0131s\u0131 olur ve sunucumuzu Fail2Ban ile koruyabiliriz. Bu yaz\u0131l\u0131m, k\u00f6t\u00fc niyetli giri\u015fim belirtileri g\u00f6steren IP&#039;leri engeller. Fail2Ban&#039;\u0131 y\u00fcklemek ve etkinle\u015ftirmek i\u00e7in \u015fu \u00fc\u00e7 komutu \u00e7al\u0131\u015ft\u0131rman\u0131z gerekir:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo apt install fail2ban\r\nsudo systemctl enable fail2ban\r\nsudo systemctl start fail2ban<\/code><\/pre>\n<\/div>\n<p>\/etc\/fail2ban\/ klas\u00f6r\u00fcndeki yap\u0131land\u0131rma dosyalar\u0131n\u0131 d\u00fczenleyerek Fail2Ban ayarlar\u0131n\u0131 \u00f6zelle\u015ftirebilirsiniz. Daha ayr\u0131nt\u0131l\u0131 bilgi ve en iyi uygulamalar i\u00e7in Fail2Ban belgelerine g\u00f6z atabilirsiniz.<\/p>\n<p>Harika! B\u00fcy\u00fck bir ad\u0131m att\u0131n\u0131z ve art\u0131k daha korumal\u0131 bir sunucunuz var. \u015eimdilik, sadece ara s\u0131ra d\u00fczenli bak\u0131m yapman\u0131z gerekiyor. Bir sonraki b\u00f6l\u00fcmde ne yapman\u0131z gerekti\u011fini a\u00e7\u0131klayaca\u011f\u0131z.<\/p>\n<h2 id=\"%d9%85%d8%b1%d8%ad%d9%84%d9%87-2-%d8%aa%d8%b9%d9%85%db%8c%d8%b1-%d9%88-%d9%86%da%af%d9%87%d8%af%d8%a7%d8%b1%db%8c-%d9%85%d9%86%d8%b8%d9%85\">Ad\u0131m 2 \u2013 D\u00fczenli Bak\u0131m<\/h2>\n<ul>\n<li>Sistem g\u00fcncellemesi<\/li>\n<\/ul>\n<p>\u00d6ncelikle sistemimiz i\u00e7in herhangi bir g\u00fcncelleme olup olmad\u0131\u011f\u0131n\u0131 kontrol etmemiz gerekiyor. \u015eu komutu \u00e7al\u0131\u015ft\u0131r\u0131n:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo apt update &amp;&amp; sudo apt upgrade -y\r\n<\/code><\/pre>\n<\/div>\n<ul>\n<li>\u0130zleme raporlar\u0131<\/li>\n<\/ul>\n<p>Ola\u011fand\u0131\u015f\u0131 etkinlikleri tespit etmek i\u00e7in sistem g\u00fcnl\u00fcklerinizi d\u00fczenli olarak kontrol etmelisiniz. Logwatch bu s\u00fcreci otomatikle\u015ftirmenize yard\u0131mc\u0131 olabilir. Logwatch&#039;\u0131 \u015fu komutla y\u00fckleyebilirsiniz:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo apt install logwatch\r\n<\/code><\/pre>\n<\/div>\n<p>G\u00fcnl\u00fck raporlar\u0131n nas\u0131l ayarlanaca\u011f\u0131, raporlar\u0131n nas\u0131l g\u00f6r\u00fcnd\u00fc\u011f\u00fc gibi konularda daha detayl\u0131 bilgiye bu k\u0131lavuzdan ula\u015fabilirsiniz.<\/p>\n<ul>\n<li>Disk kullan\u0131m\u0131n\u0131 kontrol edin.<\/li>\n<\/ul>\n<p>Sunucunuzu \u00e7al\u0131\u015ft\u0131rmak i\u00e7in yeterli alan\u0131n\u0131z oldu\u011fundan emin olmak i\u00e7in kalan disk alan\u0131n\u0131z\u0131 \u015fu komutla kontrol edin:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>df -h\r\n<\/code><\/pre>\n<\/div>\n<ul>\n<li>Verilerinizi yedekleyin.<\/li>\n<\/ul>\n<p>Sunucunuz tamamen silinirse veya eri\u015filemez hale gelirse, bir felaketten kurtulabilmeniz i\u00e7in her zaman birden fazla yede\u011finiz olmal\u0131d\u0131r. Neyse ki, Hetzner&#039;\u0131n bulut sunucular i\u00e7in otomatik bir yedekleme \u00e7\u00f6z\u00fcm\u00fc var ve resmi belgelerde inceleyebilirsiniz. Kendi yedeklemenizi olu\u015fturmak isterseniz, &quot;rsync&quot; veya &quot;Duplicity&quot; gibi ara\u00e7lar\u0131 kullanabilirsiniz.<\/p>\n<ul>\n<li>Kullan\u0131c\u0131 hesaplar\u0131n\u0131 denetle<\/li>\n<\/ul>\n<p>Sunucudaki kullan\u0131c\u0131 hesaplar\u0131n\u0131 d\u00fczenli olarak kontrol etmeyi unutmay\u0131n. Sunucunuza yaln\u0131zca yetkili kullan\u0131c\u0131lar\u0131n eri\u015febildi\u011finden emin olun. Art\u0131k ihtiya\u00e7 duymad\u0131\u011f\u0131n\u0131z hesaplar\u0131 kald\u0131r\u0131n. Kullan\u0131c\u0131 hesaplar\u0131n\u0131 \u015fu komutu \u00e7al\u0131\u015ft\u0131rarak kontrol edebilirsiniz:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo nano \/etc\/passwd\r\n<\/code><\/pre>\n<\/div>\n<ul>\n<li>Rootkit ve K\u00f6t\u00fc Ama\u00e7l\u0131 Yaz\u0131l\u0131mlar\u0131 Kontrol Edin<\/li>\n<\/ul>\n<p>Sunucunuzu h\u0131zl\u0131 bir \u015fekilde taramak i\u00e7in &quot;rkhunter&quot; ve &quot;chkrootkit&quot; gibi ara\u00e7lar\u0131 kullanabilirsiniz. Bu ara\u00e7lar, olas\u0131 rootkit&#039;leri, arka kap\u0131lar\u0131 ve yerel g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 kontrol etmenize ve her \u015feyin yolunda oldu\u011fundan emin olman\u0131za yard\u0131mc\u0131 olur. rkhunter&#039;\u0131n y\u00fckl\u00fc oldu\u011fundan emin olmak i\u00e7in \u015fu komutlar\u0131 \u00e7al\u0131\u015ft\u0131r\u0131n ve \u015funlar\u0131 kontrol edin:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo apt install rkhunter\r\nsudo rkhunter --check<\/code><\/pre>\n<\/div>\n<p><img  loading=\"lazy\"  decoding=\"async\"  src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUAAP+KeNJXAAAAAXRSTlMAQObYZgAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAApJREFUCNdjYAAAAAIAAeIhvDMAAAAASUVORK5CYII=\"  alt=\"\"  width=\"730\"  height=\"510\"  class=\"aligncenter wp-image-16001 size-full pk-lazyload\"  data-pk-sizes=\"auto\"  data-ls-sizes=\"auto, (max-width: 730px) 100vw, 730px\"  data-pk-src=\"https:\/\/cdn.itpiran.net\/2024\/08\/04012030\/1.png\"  data-pk-srcset=\"https:\/\/cdn.itpiran.net\/2024\/08\/04012030\/1.png 730w, https:\/\/cdn.itpiran.net\/2024\/08\/04012030\/1-300x210.png 300w, https:\/\/cdn.itpiran.net\/2024\/08\/04012030\/1-110x77.png 110w, https:\/\/cdn.itpiran.net\/2024\/08\/04012030\/1-200x140.png 200w, https:\/\/cdn.itpiran.net\/2024\/08\/04012030\/1-380x265.png 380w, https:\/\/cdn.itpiran.net\/2024\/08\/04012030\/1-255x178.png 255w, https:\/\/cdn.itpiran.net\/2024\/08\/04012030\/1-550x384.png 550w\" ><\/p>\n<ul>\n<li>Sistem performans izleme<\/li>\n<\/ul>\n<p>Son olarak, yaz\u0131l\u0131m\u0131 \u00e7al\u0131\u015ft\u0131r\u0131rken herhangi bir kaynak darbo\u011faz\u0131 olmad\u0131\u011f\u0131ndan emin olmak i\u00e7in sistem performans\u0131n\u0131 h\u0131zl\u0131ca kontrol edebilirsiniz. &quot;htop&quot;, &quot;top&quot; veya &quot;atop&quot; gibi ara\u00e7lar mevcuttur. Ancak \u015fu komutu \u00e7al\u0131\u015ft\u0131rabilirsiniz:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>htop<\/code><\/pre>\n<\/div>\n<p><img  loading=\"lazy\"  decoding=\"async\"  src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUAAP+KeNJXAAAAAXRSTlMAQObYZgAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAApJREFUCNdjYAAAAAIAAeIhvDMAAAAASUVORK5CYII=\"  alt=\"\"  width=\"800\"  height=\"509\"  class=\"aligncenter wp-image-16002 size-full pk-lazyload\"  data-pk-sizes=\"auto\"  data-ls-sizes=\"auto, (max-width: 800px) 100vw, 800px\"  data-pk-src=\"https:\/\/cdn.itpiran.net\/2024\/08\/04012201\/2.png\"  data-pk-srcset=\"https:\/\/cdn.itpiran.net\/2024\/08\/04012201\/2.png 800w, https:\/\/cdn.itpiran.net\/2024\/08\/04012201\/2-300x191.png 300w, https:\/\/cdn.itpiran.net\/2024\/08\/04012201\/2-768x489.png 768w, https:\/\/cdn.itpiran.net\/2024\/08\/04012201\/2-110x70.png 110w, https:\/\/cdn.itpiran.net\/2024\/08\/04012201\/2-200x127.png 200w, https:\/\/cdn.itpiran.net\/2024\/08\/04012201\/2-380x242.png 380w, https:\/\/cdn.itpiran.net\/2024\/08\/04012201\/2-255x162.png 255w, https:\/\/cdn.itpiran.net\/2024\/08\/04012201\/2-550x350.png 550w\" ><\/p>\n<h2 id=\"%d9%85%d8%b1%d8%ad%d9%84%d9%87-3-%d8%a7%d8%a8%d8%b2%d8%a7%d8%b1%d9%87%d8%a7%db%8c-%d8%a7%d9%85%d9%86%db%8c%d8%aa%db%8c-%d8%a8%db%8c%d8%b4%d8%aa%d8%b1\">Ad\u0131m 3 \u2013 Daha Fazla G\u00fcvenlik Arac\u0131<\/h2>\n<ul>\n<li>Sald\u0131r\u0131 tespit sistemlerini kullan\u0131n.<\/li>\n<\/ul>\n<p>Sistem de\u011fi\u015fikliklerinizi izlemek i\u00e7in &quot;AIDE&quot; (Geli\u015fmi\u015f Sald\u0131r\u0131 Alg\u0131lama Ortam\u0131) gibi ara\u00e7lar kullanabilirsiniz. Bu ara\u00e7, dosya ve klas\u00f6rlerinizin bir veritaban\u0131n\u0131 olu\u015fturur ve dosya b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc sa\u011flamak i\u00e7in sisteminizi bu veritaban\u0131yla kar\u015f\u0131la\u015ft\u0131r\u0131r. Daha fazla ayr\u0131nt\u0131 i\u00e7in deposuna bakabilirsiniz. \u0130lk kullan\u0131m i\u00e7in \u015fu komutu kullanarak y\u00fckleyebilirsiniz:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo apt install aide\r\n<\/code><\/pre>\n<\/div>\n<p>Veritaban\u0131n\u0131 \u015fu komutlarla ba\u015flat\u0131n ve olu\u015fturun:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo aideinit\r\nsudo cp \/var\/lib\/aide\/aide.db.new \/var\/lib\/aide\/aide.db<\/code><\/pre>\n<\/div>\n<p>Ve sisteminizi veritaban\u0131yla \u015fu komutu kullanarak kar\u015f\u0131la\u015ft\u0131r\u0131n:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo aide --config \/etc\/aide\/aide.conf --check\r\n<\/code><\/pre>\n<\/div>\n<ul>\n<li>\u0130ki fakt\u00f6rl\u00fc kimlik do\u011frulamay\u0131 (2FA) etkinle\u015ftirin<\/li>\n<\/ul>\n<p>Sunucunuza SSH \u00fczerinden giri\u015f yapmak i\u00e7in 2FA (iki fakt\u00f6rl\u00fc kimlik do\u011frulama) \u00f6zelli\u011fini de ayarlayabilirsiniz. Bu, ekstra bir koruma katman\u0131 sa\u011flar ve yetkisiz eri\u015fim riskini azalt\u0131r. \u015eu komutla y\u00fckleyebilirsiniz:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo apt install libpam-google-authenticator\r\n<\/code><\/pre>\n<\/div>\n<p>Ve ba\u015flatmak i\u00e7in \u015fu komutu \u00e7al\u0131\u015ft\u0131r\u0131n:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>google-authenticator\r\n<\/code><\/pre>\n<\/div>\n<ul>\n<li>G\u00fcvenli web uygulamalar\u0131<\/li>\n<\/ul>\n<p>Sunucunuzda web uygulamalar\u0131 \u00e7al\u0131\u015ft\u0131r\u0131yorsan\u0131z, en iyi uygulamalar\u0131n\u0131 takip etti\u011finizden ve d\u00fczenli olarak g\u00fcncelledi\u011finizden emin olun. \u00d6rne\u011fin, WordPress kullan\u0131yorsan\u0131z, her zaman en son WordPress s\u00fcr\u00fcm\u00fcn\u00fc kullanmal\u0131 ve t\u00fcm eklenti ve temalar\u0131 g\u00fcncel tutmal\u0131s\u0131n\u0131z. Ayr\u0131ca, uygun bir WordPress g\u00fcvenlik eklentisi y\u00fcklemelisiniz. Bu, sunucunuza ve uygulamalar\u0131n\u0131za yetkisiz eri\u015fim riskini azaltacakt\u0131r.<\/p>\n<h2 id=\"%d9%85%d8%b1%d8%ad%d9%84%d9%87-4-%d8%b7%d8%b1%d8%ad-%d9%88%d8%a7%da%a9%d9%86%d8%b4-%d8%a8%d9%87-%d8%ad%d8%a7%d8%af%d8%ab%d9%87\">4. Ad\u0131m \u2013 Olay M\u00fcdahale Plan\u0131<\/h2>\n<p>Bu plan b\u00fcy\u00fck kurulu\u015flarda olduk\u00e7a detayl\u0131 olabilir, ancak k\u00fc\u00e7\u00fck e\u011flence sunucular\u0131 i\u00e7in basit ve uygulanabilir tutaca\u011f\u0131z. Bu y\u00fczden sizin i\u00e7in 3 ad\u0131ml\u0131 bir plan haz\u0131rlad\u0131m.<\/p>\n<ul>\n<li>Haz\u0131rl\u0131k<\/li>\n<\/ul>\n<p>Bu b\u00f6l\u00fcm i\u00e7in, sunucu bilgilerinizle ilgili k\u00fc\u00e7\u00fck bir metin dosyas\u0131 veya not defteri program\u0131n\u0131zda notlar olu\u015fturmal\u0131s\u0131n\u0131z. Sunucu mimarisi, \u00e7al\u0131\u015ft\u0131rd\u0131\u011f\u0131 yaz\u0131l\u0131m, yedeklemelerinizin ve g\u00fcnl\u00fcklerinizin nerede sakland\u0131\u011f\u0131 ve yap\u0131land\u0131rmalar\u0131n\u0131z gibi bilgileri ekleyin. Bu notu g\u00fcvenli bir yerde saklay\u0131n. Ba\u015flang\u0131\u00e7 noktas\u0131 olarak \u015fu \u00f6rne\u011fi inceleyebilirsiniz:<\/p>\n<h5 id=\"%d8%a7%d8%b7%d9%84%d8%a7%d8%b9%d8%a7%d8%aa-%d8%b3%d8%b1%d9%88%d8%b1\">Sunucu bilgileri<\/h5>\n<table>\n<thead>\n<tr>\n<th>Bilgi<\/th>\n<th>Tan\u0131m<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Sunucu Ad\u0131<\/td>\n<td>MyServer01<\/td>\n<\/tr>\n<tr>\n<td>IP Adresi<\/td>\n<td>192.168.1.100<\/td>\n<\/tr>\n<tr>\n<td>\u0130\u015fletim Sistemi<\/td>\n<td>Ubuntu 24.04 LTS<\/td>\n<\/tr>\n<tr>\n<td>\u0130\u015flemci<\/td>\n<td>4 vCPU<\/td>\n<\/tr>\n<tr>\n<td>Veri deposu<\/td>\n<td>8 GB<\/td>\n<\/tr>\n<tr>\n<td>Depolamak<\/td>\n<td>100 GB SSD<\/td>\n<\/tr>\n<tr>\n<td>SSH Ba\u011flant\u0131 Noktas\u0131<\/td>\n<td>2222<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>Yaz\u0131l\u0131m ve Hizmetler: Nginx 1.18.0, PostgreSQL 13, Django 3.1<\/li>\n<li>Yedekleme: AWS S3&#039;te \u00e7ift, g\u00fcnl\u00fck, \/mnt\/backup ve uzak depolama, 30 g\u00fcnl\u00fck saklama<\/li>\n<li>Nginx yap\u0131land\u0131rmas\u0131: \/etc\/nginx\/nginx.conf<\/li>\n<li>PostgreSQL yap\u0131land\u0131rmas\u0131: \/etc\/postgresql\/13\/main\/postgresql.conf<\/li>\n<li>Django yap\u0131land\u0131rmas\u0131: \/home\/myuser\/myapp\/settings.py<\/li>\n<li>UFW yap\u0131land\u0131rmas\u0131: \/etc\/ufw\/ufw.conf<\/li>\n<\/ul>\n<\/li>\n<li>Tan\u0131lama<\/li>\n<\/ul>\n<p>Bu noktada, sunucunuzdaki sorunun ne oldu\u011funu kontrol etmeniz gerekir. Sorun veya ihlal web uygulaman\u0131zla m\u0131, sunucunun kendisiyle mi yoksa sunucunuzdaki veritabanlar\u0131ndan biriyle mi ilgili? Emin de\u011filseniz, her \u015feyin risk alt\u0131nda oldu\u011funu varsay\u0131n. Bu nedenle, sunucudan ba\u015flayarak her \u015feyi tekrar kontrol etmeye ba\u015flamal\u0131s\u0131n\u0131z.<\/p>\n<ul>\n<li>Geli\u015fim<\/li>\n<\/ul>\n<p>Bu b\u00f6l\u00fcmde hasarl\u0131 sistemleri geri y\u00fckleyin. Sunucunuza eri\u015femiyorsan\u0131z, bir sunucu yede\u011finden geri y\u00fckleme yapmal\u0131s\u0131n\u0131z. Web uygulamalar\u0131n\u0131zdan biri \u00e7\u00f6kerse, yaln\u0131zca yede\u011finden geri y\u00fckleme yapman\u0131z gerekebilir. Her \u015feyin geri y\u00fcklendi\u011finden, test edildi\u011finden, beklendi\u011fi gibi \u00e7al\u0131\u015ft\u0131\u011f\u0131ndan ve bir g\u00fcvenlik taramas\u0131 \u00e7al\u0131\u015ft\u0131rd\u0131\u011f\u0131n\u0131zdan emin olun.<\/p>\n<h2 id=\"%d9%86%d8%aa%db%8c%d8%ac%d9%87\">Sonu\u00e7<\/h2>\n<p>Sunucunuzun g\u00fcvenli\u011fini sa\u011flamak, en iyi uygulamalar ve d\u00fczenli bak\u0131m\u0131n bir birle\u015fimini gerektirir. Bu yaz\u0131da \u00f6zetlenen ad\u0131mlar\u0131 izleyerek sunucu g\u00fcvenli\u011finizi \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rabilir ve de\u011ferli verilerinizi koruyabilirsiniz. Unutmay\u0131n, g\u00fcvenlik s\u00fcrekli bir s\u00fcre\u00e7tir, bu nedenle sunucular\u0131n\u0131z\u0131 d\u00fczenli olarak kontrol etmeyi unutmay\u0131n.<\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"Giri\u015f \u0130lk sunucular\u0131m\u0131 hat\u0131rl\u0131yorum. Onlar\u0131 g\u00fcvenli tutmak i\u00e7in neredeyse hi\u00e7bir \u015fey yapmam\u0131\u015ft\u0131m...","protected":false},"author":1,"featured_media":15998,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"\u0686\u06af\u0648\u0646\u0647 \u0633\u0631\u0648\u0631 \u0627\u0648\u0628\u0648\u0646\u062a\u0648 \u062e\u0648\u062f \u0631\u0627 \u0627\u06cc\u0645\u0646 \u0646\u06af\u0647 \u062f\u0627\u0631\u06cc\u062f","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_yoast_wpseo_canonical":"","_yoast_wpseo_opengraph-description":"","_yoast_wpseo_opengraph-image":"","_yoast_wpseo_twitter-description":"","_yoast_wpseo_twitter-image":"","_yoast_wpseo_focuskeywords":"","_yoast_wpseo_primary_category":"193","footnotes":""},"categories":[193,324,204],"tags":[404,368],"class_list":{"0":"post-15997","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-tutorials","8":"category-security","9":"category-servers","10":"tag-security","11":"tag-ubuntu"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - 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