{"id":128,"date":"2026-02-19T14:26:58","date_gmt":"2026-02-19T14:26:58","guid":{"rendered":"https:\/\/perminet.com\/blog\/?p=128"},"modified":"2026-02-19T14:26:59","modified_gmt":"2026-02-19T14:26:59","slug":"kucuk-isletmeler-icin-sunucu-guvenligi","status":"publish","type":"post","link":"https:\/\/perminet.com\/blog\/kucuk-isletmeler-icin-sunucu-guvenligi\/","title":{"rendered":"K\u00dc\u00c7\u00dcK \u0130\u015eLETMELER \u0130\u00c7\u0130N SUNUCU G\u00dcVENL\u0130\u011e\u0130"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Bir sabah ofise geldiniz. Muhasebe program\u0131 a\u00e7\u0131lm\u0131yor. Web siteniz \u201c500 Internal Server Error\u201d veriyor. Mail trafi\u011fi durmu\u015f. \u0130lk refleks genelde \u015fu olur: \u201cSunucu \u00e7\u00f6kt\u00fc m\u00fc?\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00c7o\u011fu zaman mesele donan\u0131m de\u011fil. K\u00fc\u00e7\u00fck i\u015fletmeler i\u00e7in sunucu g\u00fcvenli\u011fi zay\u0131fsa, tek bir a\u00e7\u0131k b\u00fct\u00fcn sistemi kilitleyebilir. \u00dcstelik bu durum genellikle \u201cbize bir \u015fey olmaz\u201d denilen yap\u0131larda ya\u015fan\u0131r.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">10+ y\u0131ld\u0131r saha taraf\u0131nda g\u00f6rd\u00fc\u011f\u00fcm tablo net: K\u00fc\u00e7\u00fck i\u015fletmeler teknik olarak basit ama g\u00fcvenlik a\u00e7\u0131s\u0131ndan karma\u015f\u0131k hatalar yap\u0131yor. \u015eimdi gelin, ger\u00e7ek problemler \u00fczerinden konu\u015fal\u0131m.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">K\u00fc\u00e7\u00fck \u0130\u015fletmeler Sunucu G\u00fcvenli\u011finde En S\u0131k Hangi Hatalar\u0131 Yap\u0131yor?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">En yayg\u0131n hata: Sunucuyu kurup unutmak.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bir e-ticaret firmas\u0131nda \u00e7al\u0131\u015f\u0131rken kar\u015f\u0131la\u015ft\u0131\u011f\u0131m senaryoyu anlatay\u0131m. 12 ki\u015filik bir ekip. WordPress tabanl\u0131 site. VPS \u00fczerinde bar\u0131nd\u0131r\u0131l\u0131yor. \u0130lk kurulum g\u00fczel yap\u0131lm\u0131\u015f ama 8 ayd\u0131r hi\u00e7bir g\u00fcvenlik g\u00fcncellemesi yap\u0131lmam\u0131\u015f.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bir sabah siteye zararl\u0131 JavaScript enjekte edildi\u011fini fark ettiler. Sebep? G\u00fcncellenmemi\u015f bir eklenti \u00fczerinden SQL injection. Firewall vard\u0131 ama uygulama katman\u0131nda koruma yoktu.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">S\u0131k yap\u0131lan hatalar:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Varsay\u0131lan SSH portunu de\u011fi\u015ftirmemek<\/li>\n\n\n\n<li>Root ile direkt eri\u015fim a\u00e7\u0131k b\u0131rakmak<\/li>\n\n\n\n<li>Zay\u0131f parola politikas\u0131<\/li>\n\n\n\n<li>Yedeklerin ayn\u0131 sunucuda tutulmas\u0131<\/li>\n\n\n\n<li>Gereksiz a\u00e7\u0131k portlar (\u00f6rne\u011fin 3306 d\u0131\u015f d\u00fcnyaya a\u00e7\u0131k)<\/li>\n\n\n\n<li>Fail2ban kurulu ama do\u011fru konfig\u00fcre edilmemi\u015f<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">K\u00fc\u00e7\u00fck i\u015fletmeler genelde donan\u0131ma yat\u0131r\u0131m yap\u0131yor ama g\u00fcvenlik mimarisini planlam\u0131yor. Oysa risk genellikle d\u0131\u015far\u0131dan de\u011fil, yanl\u0131\u015f yap\u0131land\u0131rmadan gelir.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Payla\u015f\u0131ml\u0131 Hosting mi, VPS mi, Dedicated Sunucu mu Daha G\u00fcvenli?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cK\u00fc\u00e7\u00fck i\u015fletmeler i\u00e7in en g\u00fcvenli sunucu hangisi?\u201d sorusu \u00e7ok gelir. Cevap: Yap\u0131land\u0131rmaya ba\u011fl\u0131. Ama yine de net bir kar\u015f\u0131la\u015ft\u0131rma yapal\u0131m.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u00d6zellik<\/th><th>Payla\u015f\u0131ml\u0131 Hosting<\/th><th>VPS<\/th><th>Dedicated Sunucu<\/th><\/tr><\/thead><tbody><tr><td>\u0130zolasyon<\/td><td>D\u00fc\u015f\u00fck<\/td><td>Orta<\/td><td>Y\u00fcksek<\/td><\/tr><tr><td>Kaynak Kontrol\u00fc<\/td><td>S\u0131n\u0131rl\u0131<\/td><td>Orta<\/td><td>Tam<\/td><\/tr><tr><td>G\u00fcvenlik Kontrol\u00fc<\/td><td>Hosting firmas\u0131na ba\u011fl\u0131<\/td><td>K\u0131smi kontrol<\/td><td>Tam kontrol<\/td><\/tr><tr><td>Yanl\u0131\u015f Konfig\u00fcrasyon Riski<\/td><td>D\u00fc\u015f\u00fck<\/td><td>Orta<\/td><td>Y\u00fcksek<\/td><\/tr><tr><td>K\u00fc\u00e7\u00fck \u0130\u015fletme \u0130\u00e7in Uygunluk<\/td><td>Ba\u015flang\u0131\u00e7 seviyesi<\/td><td>B\u00fcy\u00fcyen firmalar<\/td><td>Y\u00fcksek trafik<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Payla\u015f\u0131ml\u0131 hosting g\u00fcvenli olabilir ama kom\u015fu sitenin a\u00e7\u0131\u011f\u0131 sizi de etkileyebilir. VPS taraf\u0131nda \u00f6zg\u00fcrl\u00fck artar ama sorumluluk da artar. Dedicated sunucu ise ciddi kontrol sa\u011flar fakat yanl\u0131\u015f yap\u0131land\u0131r\u0131l\u0131rsa en tehlikelisi olur.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">K\u00fc\u00e7\u00fck i\u015fletmeler i\u00e7in genellikle g\u00fcvenlik y\u00f6netimi olan, iyi yap\u0131land\u0131r\u0131lm\u0131\u015f bir VPS ya da y\u00f6netilen web hosting hizmeti daha mant\u0131kl\u0131 olur. \u00d6zellikle g\u00fcvenlik yamalar\u0131 ve sistem g\u00fcncellemeleri d\u00fczenli uygulan\u0131yorsa.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Sunucu G\u00fcvenli\u011finde \u201c\u00c7o\u011fu Ki\u015finin Bilmedi\u011fi\u201d Kritik Detay Nedir?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u015eimdi \u00f6nemli bir noktaya gelelim.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bir\u00e7ok ki\u015fi firewall kurunca i\u015fin bitti\u011fini san\u0131r. Ama Linux sunucularda conntrack (connection tracking) tablosu doldu\u011funda, sunucu DDoS olmadan da cevap veremez hale gelir.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bu durum genelde y\u00fcksek trafik alan k\u00fc\u00e7\u00fck i\u015fletme sitelerinde ya\u015fan\u0131r. \u00d6zellikle kampanya d\u00f6nemlerinde.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Netfilter connection tracking tablosu default de\u011ferlerde b\u0131rak\u0131l\u0131rsa, SYN flood olmasa bile yo\u011fun trafik s\u0131ras\u0131nda yeni ba\u011flant\u0131lar d\u00fc\u015fmeye ba\u015flar. Sunucu \u201cdown\u201d g\u00f6r\u00fcn\u00fcr ama asl\u0131nda kaynak t\u00fckenmi\u015ftir.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00c7\u00f6z\u00fcm ne?<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>nf_conntrack_max de\u011ferini do\u011fru ayarlamak<\/li>\n\n\n\n<li>TCP timeout s\u00fcrelerini optimize etmek<\/li>\n\n\n\n<li>SYN backlog de\u011ferini art\u0131rmak<\/li>\n\n\n\n<li>Reverse proxy (\u00f6rne\u011fin Nginx) ile ba\u011flant\u0131 y\u00f6netimini iyile\u015ftirmek<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Bu teknik detay genelde g\u00f6zden ka\u00e7ar. Halbuki k\u00fc\u00e7\u00fck i\u015fletmeler i\u00e7in sunucu g\u00fcvenli\u011fi sadece sald\u0131r\u0131y\u0131 engellemek de\u011fil, kapasiteyi do\u011fru y\u00f6netmektir.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">K\u00fc\u00e7\u00fck \u0130\u015fletmeler \u0130\u00e7in Minimum G\u00fcvenlik Kontrol Listesi Ne Olmal\u0131?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u015eimdi pratik konu\u015fal\u0131m. E\u011fer bir KOB\u0130 sunucusu y\u00f6netiyorsan\u0131z, a\u015fa\u011f\u0131dakiler minimum gereklilik:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>SSH key tabanl\u0131 eri\u015fim (password login kapal\u0131)<\/li>\n\n\n\n<li>Root login devre d\u0131\u015f\u0131<\/li>\n\n\n\n<li>G\u00fcncel i\u015fletim sistemi ve paketler<\/li>\n\n\n\n<li>UFW veya iptables ile kapal\u0131 port politikas\u0131<\/li>\n\n\n\n<li>Fail2ban aktif ve loglara g\u00f6re optimize edilmi\u015f<\/li>\n\n\n\n<li>Haftal\u0131k harici yedekleme<\/li>\n\n\n\n<li>Web uygulama g\u00fcvenlik duvar\u0131 (WAF)<\/li>\n\n\n\n<li>Log monitoring (en az\u0131ndan g\u00fcnl\u00fck kontrol)<\/li>\n\n\n\n<li>PHP disable_functions yap\u0131land\u0131rmas\u0131<\/li>\n\n\n\n<li>Dosya izinlerinin do\u011fru set edilmesi (\u00f6rne\u011fin 777 facias\u0131 olmamal\u0131)<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">777 izinlerini \u201c\u00e7al\u0131\u015fs\u0131n yeter\u201d diye a\u00e7an \u00e7ok g\u00f6rd\u00fcm. O klas\u00f6re shell y\u00fcklenmesi saniyeler s\u00fcrer.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Ger\u00e7ek Bir Sunucu G\u00fcvenlik \u0130hlali Senaryosu<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Bir m\u00fc\u015fterimiz k\u00fc\u00e7\u00fck \u00f6l\u00e7ekli bir lojistik firmas\u0131yd\u0131. Web sitesi basitti ama mail sunucusu ayn\u0131 makinedeydi.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SMTP brute-force ba\u015flad\u0131. Fail2ban yanl\u0131\u015f yap\u0131land\u0131r\u0131ld\u0131\u011f\u0131 i\u00e7in 3 denemeden sonra de\u011fil 20 denemeden sonra blokluyordu. Bu s\u0131rada bir kullan\u0131c\u0131 hesab\u0131 ele ge\u00e7irildi.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ne oldu?<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sunucu spam relay olarak kullan\u0131ld\u0131<\/li>\n\n\n\n<li>IP blacklist\u2019e girdi<\/li>\n\n\n\n<li>48 saat boyunca m\u00fc\u015fteri mailleri kar\u015f\u0131 tarafa ula\u015fmad\u0131<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Zarar sadece teknik de\u011fildi. G\u00fcven kayb\u0131 ya\u015fand\u0131.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sorun basit bir ayar hatas\u0131yd\u0131.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sunucu g\u00fcvenli\u011fi k\u00fc\u00e7\u00fck i\u015fletmeler i\u00e7in \u201colursa bakar\u0131z\u201d kategorisinde olmamal\u0131.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">K\u00fc\u00e7\u00fck \u0130\u015fletmeler Sunucu G\u00fcvenli\u011fini Nas\u0131l Daha Profesyonel Hale Getirebilir?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Her i\u015fletmenin tam zamanl\u0131 bir sistem y\u00f6neticisi olmayabilir. Ama g\u00fcvenlik d\u0131\u015f kaynakl\u0131 y\u00f6netilebilir.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00d6zellikle y\u00f6netilen hosting altyap\u0131lar\u0131, d\u00fczenli patch y\u00f6netimi ve izleme hizmetleri sunan sa\u011flay\u0131c\u0131lar burada fark yarat\u0131r. Altyap\u0131 taraf\u0131nda do\u011fru konfig\u00fcre edilmi\u015f bir web hosting hizmeti, ba\u015flang\u0131\u00e7 seviyesindeki bir\u00e7ok g\u00fcvenlik riskini ortadan kald\u0131r\u0131r.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Perminet\u2019in kurumsal web hosting altyap\u0131s\u0131nda, sistem g\u00fcncellemeleri ve temel g\u00fcvenlik katmanlar\u0131 standart olarak uygulan\u0131yor. Bu, k\u00fc\u00e7\u00fck i\u015fletmeler i\u00e7in ciddi bir operasyonel y\u00fck\u00fc ortadan kald\u0131r\u0131r.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Buradaki kritik konu \u015fu: G\u00fcvenli\u011fi \u00fcr\u00fcn de\u011fil, s\u00fcre\u00e7 olarak g\u00f6rmek.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">K\u00fc\u00e7\u00fck \u0130\u015fletmeler \u0130\u00e7in Sunucu G\u00fcvenli\u011fi Neden Ertelenmemeli?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cBiz k\u00fc\u00e7\u00fck firmay\u0131z, kim bize sald\u0131racak?\u201d d\u00fc\u015f\u00fcncesi en b\u00fcy\u00fck yan\u0131lg\u0131.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sald\u0131r\u0131lar\u0131n \u00e7o\u011fu hedefli de\u011fil, otomatik tarama botlar\u0131 taraf\u0131ndan yap\u0131l\u0131r. \u0130nternete a\u00e7\u0131k bir servisiniz varsa, zaten hedef listesindesiniz.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ayr\u0131ca veri koruma y\u00fck\u00fcml\u00fcl\u00fckleri var. KVKK kapsam\u0131nda veri ihlali ya\u015farsan\u0131z, ceza riski do\u011far. K\u00fc\u00e7\u00fck i\u015fletme olmak burada koruma sa\u011flamaz.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sunucu g\u00fcvenli\u011fi sadece teknik bir mesele de\u011fil. \u0130\u015f s\u00fcreklili\u011fi meselesi.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">FAQ \u2013 K\u00fc\u00e7\u00fck \u0130\u015fletmeler \u0130\u00e7in Sunucu G\u00fcvenli\u011fi Hakk\u0131nda S\u0131k Sorulan Sorular<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">K\u00fc\u00e7\u00fck i\u015fletmeler i\u00e7in sunucu g\u00fcvenli\u011fi pahal\u0131 m\u0131?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Do\u011fru planlanmazsa pahal\u0131d\u0131r. Ama sald\u0131r\u0131 sonras\u0131 toparlanma maliyeti \u00e7ok daha y\u00fcksektir. Y\u00f6netilen hosting \u00e7\u00f6z\u00fcmleri genellikle daha ekonomiktir.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Antivir\u00fcs kurmak yeterli mi?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Hay\u0131r. Sunucu taraf\u0131nda antivir\u00fcs tek ba\u015f\u0131na koruma sa\u011flamaz. A\u011f seviyesi g\u00fcvenlik, eri\u015fim kontrol\u00fc ve log takibi gerekir.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">K\u00fc\u00e7\u00fck bir e-ticaret sitesi ger\u00e7ekten hedef olur mu?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Evet. \u00d6zellikle WordPress, WooCommerce gibi yayg\u0131n sistemler otomatik botlar taraf\u0131ndan s\u00fcrekli taran\u0131r.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Sunucu g\u00fcvenli\u011fini kim y\u00f6netmeli?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Teknik bilgi varsa \u015firket i\u00e7i IT y\u00f6netebilir. Yoksa profesyonel destek al\u0131nmal\u0131. Yanl\u0131\u015f yap\u0131land\u0131r\u0131lm\u0131\u015f g\u00fcvenlik, hi\u00e7 olmamas\u0131ndan daha tehlikelidir.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Haftal\u0131k yedek almak yeterli mi?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Veri yo\u011funlu\u011funa ba\u011fl\u0131. G\u00fcnl\u00fck hatta saatlik yedek gerekebilir. \u00d6nemli olan yede\u011fin farkl\u0131 bir fiziksel ortamda tutulmas\u0131d\u0131r.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">K\u00fc\u00e7\u00fck i\u015fletmeler i\u00e7in sunucu g\u00fcvenli\u011fi bir l\u00fcks de\u011fil. \u0130\u015fin devam edebilmesi i\u00e7in temel \u015fart.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sunucu \u00e7al\u0131\u015f\u0131yor diye g\u00fcvende oldu\u011funu sanma. Loglara bak. Portlar\u0131 kontrol et. G\u00fcncellemeleri denetle.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">G\u00fcvenlik, kurup unutaca\u011f\u0131n bir ayar de\u011fil; s\u00fcrekli ya\u015fayan bir s\u00fcre\u00e7tir.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Bir sabah ofise geldiniz. Muhasebe program\u0131 a\u00e7\u0131lm\u0131yor. Web siteniz \u201c500 Internal Server Error\u201d veriyor. 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