{"id":44580,"date":"2026-09-07T21:09:17","date_gmt":"2026-09-07T18:09:17","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/kubernetes-ve-swap-varsayilan-olarak-neden-devre-disi-birakildi-ve-bu-durum-nasil-degisiyor-bir-kubeadm-hata-ayiklama-hikayesi\/"},"modified":"2026-09-07T21:09:17","modified_gmt":"2026-09-07T18:09:17","slug":"kubernetes-ve-swap-varsayilan-olarak-neden-devre-disi-birakildi-ve-bu-durum-nasil-degisiyor-bir-kubeadm-hata-ayiklama-hikayesi","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/kubernetes-ve-swap-varsayilan-olarak-neden-devre-disi-birakildi-ve-bu-durum-nasil-degisiyor-bir-kubeadm-hata-ayiklama-hikayesi\/","title":{"rendered":"Kubernetes ve Swap: Varsay\u0131lan Olarak Neden Devre D\u0131\u015f\u0131 B\u0131rak\u0131ld\u0131 ve Bu Durum Nas\u0131l De\u011fi\u015fiyor? &#8211; Bir kubeadm Hata Ay\u0131klama Hikayesi"},"content":{"rendered":"<h2>Kubernetes ve Swap: Varsay\u0131lan Olarak Neden Devre D\u0131\u015f\u0131 B\u0131rak\u0131ld\u0131 ve Bu Durum Nas\u0131l De\u011fi\u015fiyor? &#8211; Bir kubeadm Hata Ay\u0131klama Hikayesi<\/h2>\n<p>Kubernetes, modern uygulama geli\u015ftirme ve da\u011f\u0131t\u0131m s\u00fcre\u00e7lerinin vazge\u00e7ilmez bir par\u00e7as\u0131 haline geldi. Ancak bu g\u00fc\u00e7l\u00fc platformu kullanmaya ba\u015flad\u0131\u011f\u0131n\u0131zda, \u00f6zellikle kurulum a\u015famas\u0131nda kar\u015f\u0131n\u0131za \u00e7\u0131kabilecek baz\u0131 ilgin\u00e7 &#8220;engeller&#8221; vard\u0131r. Bunlardan biri de swap belle\u011fi (takas alan\u0131) ile ilgili olan\u0131d\u0131r. Bir\u00e7ok geli\u015ftirici ve sistem y\u00f6neticisi, <code>kubeadm init<\/code> komutunu \u00e7al\u0131\u015ft\u0131rd\u0131\u011f\u0131nda kar\u015f\u0131la\u015ft\u0131\u011f\u0131 &#8220;swap enabled&#8221; hatas\u0131yla bo\u011fu\u015fmu\u015ftur. Bu makale, Kubernetes&#8217;in swap belle\u011fini neden varsay\u0131lan olarak devre d\u0131\u015f\u0131 b\u0131rakt\u0131\u011f\u0131n\u0131, bunun ge\u00e7mi\u015fte ne gibi sorunlara yol a\u00e7t\u0131\u011f\u0131n\u0131 ve g\u00fcn\u00fcm\u00fczde bu yakla\u015f\u0131m\u0131n nas\u0131l de\u011fi\u015fti\u011fini detayl\u0131 bir \u015fekilde ele alacak.<\/p>\n<h2>Kubernetes ve Swap Bellek \u0130li\u015fkisi: Neden Ba\u015flang\u0131\u00e7ta Devre D\u0131\u015f\u0131 B\u0131rak\u0131ld\u0131?<\/h2>\n<p>Swap bellek, i\u015fletim sistemlerinin fiziksel belle\u011fi (RAM) doldu\u011funda, az kullan\u0131lan verileri sabit diske ta\u015f\u0131yarak bellekte yer a\u00e7mas\u0131n\u0131 sa\u011flayan bir mekanizmad\u0131r. Bu, sistemin anl\u0131k bellek yetersizli\u011fi durumlar\u0131nda \u00e7\u00f6kmesini engeller ve daha fazla uygulama \u00e7al\u0131\u015ft\u0131rmas\u0131na olanak tan\u0131r. Geleneksel sunucu ortamlar\u0131nda swap bellek, sistem kararl\u0131l\u0131\u011f\u0131 i\u00e7in \u00f6nemli bir rol oynarken, Kubernetes d\u00fcnyas\u0131nda durum biraz farkl\u0131d\u0131r. Asl\u0131nda, Kubernetes&#8217;in temel bile\u015fenlerinden biri olan <code>kubelet<\/code>, bir d\u00fc\u011f\u00fcmde swap belle\u011fin etkinle\u015ftirilmesini uzun s\u00fcre boyunca kesinlikle reddetmi\u015ftir.<\/p>\n<p>Bu karar\u0131n arkas\u0131nda yatan temel neden, performans \u00f6ng\u00f6r\u00fclebilirli\u011fi ve kaynak izolasyonudur. Kubernetes, uygulamalar\u0131 konteynerler (container) i\u00e7inde \u00e7al\u0131\u015ft\u0131r\u0131r ve bu konteynerlere belirli CPU ve bellek limitleri atar. Bu limitler, <code>cgroups<\/code> ad\u0131 verilen Linux \u00e7ekirdek \u00f6zellikleriyle uygulan\u0131r. Ama\u00e7, bir uygulaman\u0131n di\u011ferini etkilemeden, kendisine ayr\u0131lan kaynaklar\u0131 kullanmas\u0131n\u0131 sa\u011flamakt\u0131r. Swap bellek devreye girdi\u011finde, bu \u00f6ng\u00f6r\u00fclebilirlik ciddi \u015fekilde bozulur. Bir pod (Kubernetes&#8217;teki en k\u00fc\u00e7\u00fck da\u011f\u0131t\u0131labilir birim), kendisine ayr\u0131lan belle\u011fi a\u015ft\u0131\u011f\u0131nda ve sistem swap kullanmaya ba\u015flad\u0131\u011f\u0131nda, veriler h\u0131zl\u0131 SSD&#8217;ler yerine \u00e7ok daha yava\u015f olan sabit diske yaz\u0131l\u0131r. Bu durum, uygulaman\u0131n performans\u0131nda ani ve \u00f6ng\u00f6r\u00fclemeyen d\u00fc\u015f\u00fc\u015flere yol a\u00e7ar. Bir e-ticaret sitesinin kritik bir mikro hizmetinin aniden yava\u015flad\u0131\u011f\u0131n\u0131 ve m\u00fc\u015fterilerin sipari\u015f veremedi\u011fini hayal edin. Bu t\u00fcr senaryolar, swap kullan\u0131m\u0131n\u0131n getirece\u011fi performans belirsizli\u011finin en somut \u00f6rneklerindendir.<\/p>\n<p>Ayr\u0131ca, swap belle\u011fin varl\u0131\u011f\u0131, Kubernetes&#8217;in bellek kaynaklar\u0131n\u0131 y\u00f6netme ve OOM Killer (Out Of Memory Killer) gibi mekanizmalarla etkile\u015fimini karma\u015f\u0131kla\u015ft\u0131r\u0131r. Kubernetes, bir pod&#8217;un bellek limitini a\u015ft\u0131\u011f\u0131n\u0131 tespit etti\u011finde, genellikle o pod&#8217;u sonland\u0131rarak di\u011fer pod&#8217;lar\u0131n kararl\u0131l\u0131\u011f\u0131n\u0131 sa\u011flamaya \u00e7al\u0131\u015f\u0131r. Ancak swap etkinle\u015ftirildi\u011finde, sistem \u00f6nce verileri diske ta\u015f\u0131maya ba\u015flar, bu da OOM Killer&#8217;\u0131n tetiklenmesini geciktirebilir veya yanl\u0131\u015f pod&#8217;lar\u0131n hedeflenmesine neden olabilir. Bu durum, kaynak izolasyonunu zay\u0131flat\u0131r ve cluster (k\u00fcme) genelinde istikrars\u0131zl\u0131\u011fa yol a\u00e7abilir. Bu nedenle, Kubernetes geli\u015ftiricileri, ilk etapta swap&#8217;\u0131 tamamen devre d\u0131\u015f\u0131 b\u0131rakman\u0131n, cluster&#8217;\u0131n genel kararl\u0131l\u0131\u011f\u0131 ve performans \u00f6ng\u00f6r\u00fclebilirli\u011fi i\u00e7in en g\u00fcvenli yakla\u015f\u0131m oldu\u011funa karar verdiler. Bu k\u0131s\u0131tlama, \u00f6zellikle \u00fcretim ortamlar\u0131nda y\u00fcksek performans ve istikrar gerektiren uygulamalar i\u00e7in kritik \u00f6neme sahipti.<\/p>\n<h2>kubeadm ile Kurulum S\u00fcrecinde Swap Hatalar\u0131 ve Giderilmesi<\/h2>\n<p>Kubernetes&#8217;e yeni ba\u015flayan bir\u00e7ok ki\u015finin ilk kar\u015f\u0131la\u015ft\u0131\u011f\u0131 zorluklardan biri, <code>kubeadm<\/code> ile bir k\u00fcme kurmaya \u00e7al\u0131\u015f\u0131rken al\u0131nan &#8220;swap enabled&#8221; hatas\u0131d\u0131r. <code>kubeadm<\/code>, bir Kubernetes k\u00fcmesini ba\u015flatmak i\u00e7in kullan\u0131lan resmi ara\u00e7t\u0131r ve d\u00fc\u011f\u00fcmlerin belirli \u00f6n ko\u015fullar\u0131 kar\u015f\u0131lamas\u0131n\u0131 bekler. Bu \u00f6n ko\u015fullardan biri de swap belle\u011fin devre d\u0131\u015f\u0131 b\u0131rak\u0131lm\u0131\u015f olmas\u0131d\u0131r. E\u011fer sunucunuzda swap etkinse, <code>kubeadm init<\/code> veya <code>kubeadm join<\/code> komutunu \u00e7al\u0131\u015ft\u0131rd\u0131\u011f\u0131n\u0131zda a\u015fa\u011f\u0131daki gibi bir hata mesaj\u0131yla kar\u015f\u0131la\u015f\u0131rs\u0131n\u0131z:<\/p>\n<div class=\"code-container\">\n<pre><code>\n[ERROR Swap]: running with swap on is not supported. Please disable swap\n<\/code><\/pre>\n<\/div>\n<p>Bu hata mesaj\u0131 olduk\u00e7a nettir: swap&#8217;\u0131 devre d\u0131\u015f\u0131 b\u0131rakmal\u0131s\u0131n\u0131z. Peki bunu nas\u0131l yapars\u0131n\u0131z? \u0130\u015fte ad\u0131m ad\u0131m bir vaka analizi ve \u00e7\u00f6z\u00fcm:<\/p>\n<p>Bir g\u00fcn, gen\u00e7 bir DevOps m\u00fchendisi olan Ay\u015fe, \u015firketi i\u00e7in yeni bir Kubernetes k\u00fcmesi kurmakla g\u00f6revlendirildi. \u00dc\u00e7 adet temiz Ubuntu sunucusunu haz\u0131rlad\u0131 ve <code>kubeadm<\/code> belgelerini takip ederek kurulum s\u00fcrecine ba\u015flad\u0131. Her \u015fey yolunda gidiyordu, ta ki master d\u00fc\u011f\u00fcmde <code>sudo kubeadm init --pod-network-cidr=10.244.0.0\/16<\/code> komutunu \u00e7al\u0131\u015ft\u0131rana kadar. Konsolda yukar\u0131daki &#8220;swap enabled&#8221; hatas\u0131n\u0131 g\u00f6r\u00fcnce \u015fa\u015f\u0131rd\u0131. Daha \u00f6nce b\u00f6yle bir durumla kar\u015f\u0131la\u015fmam\u0131\u015ft\u0131.<\/p>\n<p>Ay\u015fe, hemen internette ara\u015ft\u0131rma yapmaya ba\u015flad\u0131 ve bu hatan\u0131n yayg\u0131n oldu\u011funu \u00f6\u011frendi. \u00c7\u00f6z\u00fcm olduk\u00e7a basitti: swap&#8217;\u0131 ge\u00e7ici olarak devre d\u0131\u015f\u0131 b\u0131rakmak i\u00e7in <code>sudo swapoff -a<\/code> komutunu kullanmak. Bu komutu \u00e7al\u0131\u015ft\u0131rd\u0131ktan sonra <code>kubeadm init<\/code> komutunu tekrar denedi ve bu sefer ba\u015far\u0131l\u0131 oldu. Ancak, bu sadece ge\u00e7ici bir \u00e7\u00f6z\u00fcmd\u00fc. Sunucu yeniden ba\u015flat\u0131ld\u0131\u011f\u0131nda swap otomatik olarak tekrar etkinle\u015fecekti. Bu durumu kal\u0131c\u0131 hale getirmek i\u00e7in, swap yap\u0131land\u0131rmas\u0131n\u0131n bulundu\u011fu <code>\/etc\/fstab<\/code> dosyas\u0131n\u0131 d\u00fczenlemesi gerekiyordu.<\/p>\n<div class=\"code-container\">\n<pre><code>\n# Ge\u00e7ici olarak swap'\u0131 kapatma\nsudo swapoff -a\n\n# \/etc\/fstab dosyas\u0131n\u0131 d\u00fczenleme\nsudo nano \/etc\/fstab\n<\/code><\/pre>\n<\/div>\n<p><code>\/etc\/fstab<\/code> dosyas\u0131n\u0131 a\u00e7t\u0131\u011f\u0131nda, swap b\u00f6l\u00fcm\u00fcn\u00fc belirten bir sat\u0131r g\u00f6rd\u00fc, genellikle \u015f\u00f6yle bir \u015feye benzer:<\/p>\n<div class=\"code-container\">\n<pre><code>\n\/swapfile none swap sw 0 0\n<\/code><\/pre>\n<\/div>\n<p>Bu sat\u0131r\u0131n ba\u015f\u0131na bir <code>#<\/code> i\u015fareti koyarak veya tamamen silerek swap&#8217;\u0131n kal\u0131c\u0131 olarak devre d\u0131\u015f\u0131 b\u0131rak\u0131lmas\u0131n\u0131 sa\u011flad\u0131. Sat\u0131r\u0131 yorum sat\u0131r\u0131 haline getirmek, ileride swap&#8217;a ihtiya\u00e7 duyulursa kolayca geri al\u0131nabilmesi a\u00e7\u0131s\u0131ndan daha iyi bir uygulamad\u0131r. T\u00fcm d\u00fc\u011f\u00fcmlerde bu i\u015flemi tekrarlad\u0131ktan sonra, Ay\u015fe&#8217;nin Kubernetes k\u00fcmesi sorunsuz bir \u015fekilde kuruldu ve \u00e7al\u0131\u015fmaya ba\u015flad\u0131. Bu hikaye, Kubernetes ile swap&#8217;\u0131n neden bu kadar sorunlu bir ili\u015fki i\u00e7inde oldu\u011funu ve bu sorunun nas\u0131l pratik bir \u015fekilde \u00e7\u00f6z\u00fcld\u00fc\u011f\u00fcn\u00fc net bir \u015fekilde g\u00f6stermektedir. Bu deneyim, bir\u00e7ok DevOps profesyonelinin kariyerinin ba\u015flang\u0131c\u0131nda edindi\u011fi temel bilgilerden biridir ve Kubernetes ekosisteminin kaynak y\u00f6netimi konusundaki hassasiyetini vurgular.<\/p>\n<h2>Swap K\u0131s\u0131tlamas\u0131n\u0131n Derinlemesine Analizi: Performans ve G\u00fcvenlik Endi\u015feleri<\/h2>\n<p>Kubernetes&#8217;in swap belle\u011fi varsay\u0131lan olarak devre d\u0131\u015f\u0131 b\u0131rakma karar\u0131, basit bir teknik tercih olmaktan \u00f6te, da\u011f\u0131t\u0131k sistemlerin performans ve g\u00fcvenilirlik felsefesinin bir yans\u0131mas\u0131d\u0131r. Bu k\u0131s\u0131tlaman\u0131n alt\u0131nda yatan derinlemesine teknik ve operasyonel endi\u015feleri anlamak, Kubernetes&#8217;in neden bu kadar kat\u0131 davrand\u0131\u011f\u0131n\u0131 kavramam\u0131za yard\u0131mc\u0131 olur. Bu endi\u015feler genellikle \u00fc\u00e7 ana ba\u015fl\u0131k alt\u0131nda toplanabilir: performans d\u00fc\u015f\u00fc\u015f\u00fc, belirsiz davran\u0131\u015f ve kaynak izolasyonu sorunlar\u0131.<\/p>\n<p>\u00d6ncelikle, <strong>performans d\u00fc\u015f\u00fc\u015f\u00fc<\/strong> en belirgin ve en s\u0131k dile getirilen endi\u015fedir. RAM, saniyede gigabaytlarca veri i\u015fleyebilirken, sabit diskler (SSD&#8217;ler bile olsa) bu h\u0131z\u0131n \u00e7ok gerisinde kal\u0131r. Bir uygulama belle\u011fini a\u015ft\u0131\u011f\u0131nda ve i\u015fletim sistemi verileri swap alan\u0131na yazmaya ba\u015flad\u0131\u011f\u0131nda, bu verilere eri\u015fim h\u0131z\u0131 katlanarak d\u00fc\u015fer. Bu durum, \u00f6zellikle d\u00fc\u015f\u00fck gecikme s\u00fcresi (low latency) gerektiren mikro hizmetler veya veri yo\u011fun uygulamalar i\u00e7in felaket anlam\u0131na gelebilir. \u00d6rne\u011fin, bir veritaban\u0131 pod&#8217;unun yo\u011fun bir sorgu s\u0131ras\u0131nda belle\u011fi doldu\u011funda ve swap&#8217;a d\u00fc\u015fmeye ba\u015flad\u0131\u011f\u0131nda, sorgu yan\u0131t s\u00fcreleri saniyelerden dakikalara \u00e7\u0131kabilir. Bu, kullan\u0131c\u0131 deneyimini do\u011frudan etkileyen ve i\u015f s\u00fcreklili\u011fini tehdit eden bir durumdur. Kubernetes, d\u00fc\u011f\u00fcmlerin ve pod&#8217;lar\u0131n performans\u0131n\u0131n \u00f6ng\u00f6r\u00fclebilir olmas\u0131n\u0131 hedefler; swap ise bu \u00f6ng\u00f6r\u00fclebilirli\u011fi tamamen ortadan kald\u0131r\u0131r.<\/p>\n<p>\u0130kinci olarak, swap&#8217;\u0131n varl\u0131\u011f\u0131 <strong>belirsiz davran\u0131\u015flara<\/strong> yol a\u00e7abilir. Kubernetes, her pod&#8217;a CPU ve bellek limitleri atayarak kaynak y\u00f6netimini sa\u011flar. Bu limitler a\u015f\u0131ld\u0131\u011f\u0131nda, sistem genellikle o pod&#8217;u sonland\u0131rarak (OOM Killed) di\u011fer pod&#8217;lar\u0131n ve d\u00fc\u011f\u00fcm\u00fcn genel sa\u011fl\u0131\u011f\u0131n\u0131 korur. Ancak swap etkin oldu\u011funda, bir pod bellek limitini a\u015ft\u0131\u011f\u0131nda hemen sonland\u0131r\u0131lmak yerine, verileri swap alan\u0131na ta\u015f\u0131n\u0131r. Bu, pod&#8217;un yava\u015flamas\u0131na ancak \u00e7al\u0131\u015fmaya devam etmesine neden olur. Yava\u015f \u00e7al\u0131\u015fan bir pod, di\u011fer hizmetleri de etkileyebilir, zincirleme performans sorunlar\u0131na yol a\u00e7abilir. En \u00f6nemlisi, bu durum hata ay\u0131klamay\u0131 son derece zorla\u015ft\u0131r\u0131r. Hangi pod&#8217;un neden yava\u015flad\u0131\u011f\u0131n\u0131 anlamak, swap&#8217;\u0131n devreye girip girmedi\u011fini tespit etmek, karma\u015f\u0131k izleme ara\u00e7lar\u0131 gerektirir ve sorunun k\u00f6k nedenini bulmay\u0131 geciktirir. Bir sistem y\u00f6neticisinin, bir uygulaman\u0131n performans sorununu \u00e7\u00f6zmeye \u00e7al\u0131\u015f\u0131rken, sorunun asl\u0131nda d\u00fc\u015f\u00fck disk I\/O&#8217;sundan kaynaklanan swap kullan\u0131m\u0131ndan geldi\u011fini fark etmesi saatler alabilir.<\/p>\n<p>Son olarak, <strong>kaynak izolasyonu<\/strong> swap ile ciddi \u015fekilde tehlikeye girer. Kubernetes, Linux cgroups (control groups) kullanarak her pod&#8217;un bellek, CPU ve di\u011fer kaynaklar\u0131 izole bir \u015fekilde kullanmas\u0131n\u0131 sa\u011flar. Swap etkin oldu\u011funda, bir pod&#8217;un bellek bask\u0131s\u0131, d\u00fc\u011f\u00fcmdeki di\u011fer pod&#8217;lar\u0131n performans\u0131n\u0131 dolayl\u0131 yoldan etkileyebilir. E\u011fer bir pod \u00e7ok fazla swap kullan\u0131rsa, bu durum disk I\/O&#8217;sunu art\u0131r\u0131r ve disk bant geni\u015fli\u011fini t\u00fcketir. Bu da ayn\u0131 disk \u00fczerinde \u00e7al\u0131\u015fan di\u011fer pod&#8217;lar\u0131n disk eri\u015fim h\u0131z\u0131n\u0131 d\u00fc\u015f\u00fcr\u00fcr. Dolay\u0131s\u0131yla, bir pod&#8217;un kendi bellek limitini a\u015fmas\u0131, di\u011fer pod&#8217;lar\u0131n kaynaklar\u0131n\u0131 da etkileyerek t\u00fcm d\u00fc\u011f\u00fcm\u00fcn performans\u0131n\u0131 d\u00fc\u015f\u00fcrebilir. Bu, Kubernetes&#8217;in temel prensiplerinden biri olan &#8220;kom\u015fu g\u00fcr\u00fclt\u00fcs\u00fc&#8221; (noisy neighbor) sorununu tetikler ve t\u00fcm k\u00fcmenin istikrar\u0131n\u0131 bozar. Bu derinlemesine analizler, Kubernetes&#8217;in neden swap konusunda bu kadar kat\u0131 bir duru\u015f sergiledi\u011fini ve uzun y\u0131llar boyunca bu k\u0131s\u0131tlamay\u0131 s\u00fcrd\u00fcrd\u00fc\u011f\u00fcn\u00fc a\u00e7\u0131k\u00e7a ortaya koymaktad\u0131r.<\/p>\n<h2>Kubernetes 1.22 Sonras\u0131 De\u011fi\u015fim R\u00fczgarlar\u0131: Swap Deste\u011fi Neden Geri Geliyor?<\/h2>\n<p>Kubernetes&#8217;in swap belle\u011fe kar\u015f\u0131 uzun s\u00fcreli ve kat\u0131 duru\u015fu, topluluk i\u00e7inde s\u00fcrekli bir tart\u0131\u015fma konusu olmu\u015ftur. Bir yandan performans \u00f6ng\u00f6r\u00fclebilirli\u011fi ve kaynak izolasyonu gibi temel prensipler korunmak istenirken, di\u011fer yandan baz\u0131 kullan\u0131m senaryolar\u0131nda swap&#8217;\u0131n tamamen devre d\u0131\u015f\u0131 b\u0131rak\u0131lmas\u0131n\u0131n getirdi\u011fi k\u0131s\u0131tlamalar rahats\u0131zl\u0131k yaratm\u0131\u015ft\u0131r. \u00d6zellikle geli\u015ftirme ortamlar\u0131, test k\u00fcmeleri veya belirli i\u015f y\u00fckleri i\u00e7in swap&#8217;\u0131n kontroll\u00fc bir \u015fekilde kullan\u0131labilmesi arzusu giderek artt\u0131. Bu talepler, Kubernetes toplulu\u011funu swap k\u0131s\u0131tlamas\u0131n\u0131 yeniden de\u011ferlendirmeye itti ve nihayet Kubernetes 1.22 s\u00fcr\u00fcm\u00fcyle birlikte \u00f6nemli bir d\u00f6n\u00fcm noktas\u0131na ula\u015f\u0131ld\u0131.<\/p>\n<p>Bu de\u011fi\u015fimin temelini KEP-2400 (Kubernetes Enhancement Proposal) olu\u015fturur. Bu \u00f6neri, Kubernetes&#8217;in swap belle\u011fi destekleme yetene\u011fini, ancak bunu kontroll\u00fc ve yap\u0131land\u0131r\u0131labilir bir \u015fekilde yapmas\u0131n\u0131 sa\u011flamay\u0131 ama\u00e7lad\u0131. Buradaki ana fikir, swap&#8217;\u0131 tamamen serbest b\u0131rakmak yerine, kubelet&#8217;in swap kullan\u0131m\u0131n\u0131 y\u00f6netebilece\u011fi ve y\u00f6neticilerin bu davran\u0131\u015f\u0131 d\u00fc\u011f\u00fcm baz\u0131nda yap\u0131land\u0131rabilece\u011fi bir mekanizma sunmakt\u0131. Bu yakla\u015f\u0131m, hem eski kat\u0131 politikalar\u0131n getirdi\u011fi sorunlar\u0131 hafifletmeyi hem de Kubernetes&#8217;in temel prensiplerini korumay\u0131 hedefliyordu.<\/p>\n<p>Kubernetes 1.22 ile birlikte, kubelet&#8217;e yeni bir yap\u0131land\u0131rma se\u00e7ene\u011fi eklendi: <code>memorySwap<\/code>. Bu ayar, kubelet&#8217;in swap belle\u011fi nas\u0131l ele alaca\u011f\u0131n\u0131 belirler ve iki ana mod sunar: <code>LimitedSwap<\/code> (s\u0131n\u0131rl\u0131 swap) ve <code>UnlimitedSwap<\/code> (s\u0131n\u0131rs\u0131z swap). Varsay\u0131lan olarak, kubelet hala swap&#8217;\u0131 devre d\u0131\u015f\u0131 b\u0131rakma e\u011filimindedir veya <code>LimitedSwap<\/code> modunda \u00e7al\u0131\u015f\u0131r ki bu da swap kullan\u0131m\u0131n\u0131 belirli s\u0131n\u0131rlar i\u00e7inde tutar. <code>LimitedSwap<\/code> modunda, kubelet, container&#8217;lar\u0131n kendi bellek limitlerini a\u015fan bellek kullan\u0131mlar\u0131n\u0131n swap&#8217;a gitmesine izin verir, ancak d\u00fc\u011f\u00fcm\u00fcn toplam swap kullan\u0131m\u0131n\u0131 kontrol alt\u0131nda tutmaya \u00e7al\u0131\u015f\u0131r. Bu, \u00f6zellikle bellek s\u0131z\u0131nt\u0131lar\u0131 olan veya ani bellek art\u0131\u015flar\u0131 ya\u015fayan uygulamalar\u0131n d\u00fc\u011f\u00fcm\u00fc tamamen \u00e7\u00f6kertmesini engellemeye yard\u0131mc\u0131 olurken, ayn\u0131 zamanda hafif swap kullan\u0131m\u0131na izin verir.<\/p>\n<p>Peki, bu de\u011fi\u015fim neden \u015fimdi ger\u00e7ekle\u015fti? Birka\u00e7 fakt\u00f6r rol oynad\u0131. \u0130lk olarak, modern altyap\u0131lar (\u00f6zellikle bulut ortamlar\u0131) genellikle daha h\u0131zl\u0131 depolama \u00e7\u00f6z\u00fcmleri (NVMe SSD&#8217;ler) sunuyor. Bu, swap&#8217;\u0131n performans \u00fczerindeki olumsuz etkisini bir miktar azaltabilir. \u0130kinci olarak, Kubernetes ekosistemi olgunla\u015ft\u0131k\u00e7a, farkl\u0131 i\u015f y\u00fcklerinin ve kullan\u0131m senaryolar\u0131n\u0131n ihtiya\u00e7lar\u0131 daha iyi anla\u015f\u0131ld\u0131. Geli\u015ftirme ve test ortamlar\u0131nda, k\u00fc\u00e7\u00fck bir miktar swap&#8217;\u0131n etkinle\u015ftirilmesi, geli\u015ftiricilerin bellek sorunlar\u0131n\u0131 daha kolay tespit etmesine veya uygulamalar\u0131n anl\u0131k bellek zirvelerini atlatmas\u0131na yard\u0131mc\u0131 olabilir. \u00dc\u00e7\u00fcnc\u00fc olarak, topluluktan gelen yo\u011fun geri bildirimler, swap&#8217;\u0131n tamamen devre d\u0131\u015f\u0131 b\u0131rak\u0131lmas\u0131n\u0131n baz\u0131 durumlarda gereksiz bir k\u0131s\u0131tlama oldu\u011fu y\u00f6n\u00fcndeydi. Bu yeni esneklik, Kubernetes&#8217;in daha geni\u015f bir kullan\u0131m alan\u0131na yay\u0131lmas\u0131na ve farkl\u0131 operasyonel gereksinimlere uyum sa\u011flamas\u0131na olanak tan\u0131yor. Ancak unutulmamal\u0131d\u0131r ki, bu destek hala dikkatli bir \u015fekilde kullan\u0131lmal\u0131 ve \u00fcretim ortamlar\u0131nda swap kullan\u0131m\u0131n\u0131n potansiyel riskleri g\u00f6z ard\u0131 edilmemelidir.<\/p>\n<h2>kubelet Yap\u0131land\u0131rmas\u0131 ile Swap Y\u00f6netimi: Ad\u0131m Ad\u0131m Uygulama<\/h2>\n<p>Kubernetes 1.22 ve sonraki s\u00fcr\u00fcmlerle gelen swap deste\u011fi, y\u00f6neticilere ve geli\u015ftiricilere daha fazla esneklik sunsa da, bu \u00f6zelli\u011fi etkinle\u015ftirmek ve yap\u0131land\u0131rmak belirli ad\u0131mlar gerektirir. Bu k\u0131s\u0131mda, <code>kubelet<\/code> yap\u0131land\u0131rmas\u0131n\u0131 kullanarak swap&#8217;\u0131 nas\u0131l y\u00f6netebilece\u011finizi ad\u0131m ad\u0131m inceleyece\u011fiz. Unutmay\u0131n, bu de\u011fi\u015fiklikler her d\u00fc\u011f\u00fcmde ayr\u0131 ayr\u0131 yap\u0131lmal\u0131d\u0131r ve dikkatli bir \u015fekilde uygulanmal\u0131d\u0131r.<\/p>\n<p>Swap deste\u011fini etkinle\u015ftirmek i\u00e7in, <code>kubelet<\/code>&#8216;in yap\u0131land\u0131rma dosyas\u0131n\u0131 (genellikle <code>\/etc\/kubernetes\/kubelet-config.yaml<\/code> veya kubelet&#8217;in \u00e7al\u0131\u015ft\u0131\u011f\u0131 sistem hizmetinin yap\u0131land\u0131rmas\u0131 i\u00e7inde) de\u011fi\u015ftirmeniz gerekir. Bu yap\u0131land\u0131rma, <code>KubeletConfiguration<\/code> API objesi kullan\u0131larak yap\u0131l\u0131r. \u0130\u015fte swap&#8217;\u0131 etkinle\u015ftirmek i\u00e7in kullanabilece\u011finiz temel yap\u0131land\u0131rma \u00f6rnekleri:<\/p>\n<h3>1. Swap&#8217;\u0131 S\u0131n\u0131rl\u0131 Modda Etkinle\u015ftirme (LimitedSwap)<\/h3>\n<p>Bu mod, kubelet&#8217;in swap kullanmas\u0131na izin verir, ancak container&#8217;lar\u0131n bellek limitlerini a\u015fan bellek kullan\u0131mlar\u0131n\u0131n swap&#8217;a gitmesine \u00f6ncelik verir. D\u00fc\u011f\u00fcm\u00fcn genel swap kullan\u0131m\u0131n\u0131 kontrol alt\u0131nda tutar. Bu, bir\u00e7ok senaryo i\u00e7in en dengeli yakla\u015f\u0131md\u0131r. Varsay\u0131lan olarak bu mod etkinle\u015febilir, ancak a\u00e7\u0131k\u00e7a belirtmek daha iyidir.<\/p>\n<div class=\"code-container\">\n<pre><code>\napiVersion: kubelet.config.k8s.io\/v1beta1\nkind: KubeletConfiguration\nmemorySwap:\n  swapBehavior: LimitedSwap\n<\/code><\/pre>\n<\/div>\n<p>Bu yap\u0131land\u0131rmay\u0131, kubelet&#8217;in mevcut yap\u0131land\u0131rma dosyas\u0131na eklemeli veya mevcut <code>memorySwap<\/code> b\u00f6l\u00fcm\u00fcn\u00fc g\u00fcncellemelisiniz. E\u011fer bu dosya yoksa, \u00f6nce bir tane olu\u015fturman\u0131z ve kubelet&#8217;i bu dosyay\u0131 kullanacak \u015fekilde yap\u0131land\u0131rman\u0131z gerekebilir.<\/p>\n<h3>2. Swap&#8217;\u0131 S\u0131n\u0131rs\u0131z Modda Etkinle\u015ftirme (UnlimitedSwap)<\/h3>\n<p>Bu mod, kubelet&#8217;in swap kullan\u0131m\u0131na herhangi bir k\u0131s\u0131tlama getirmez. \u0130\u015fletim sistemi, fiziksel bellek doldu\u011funda istedi\u011fi gibi swap alan\u0131n\u0131 kullanabilir. Bu, daha \u00f6nce swap&#8217;\u0131n tamamen devre d\u0131\u015f\u0131 b\u0131rak\u0131lmad\u0131\u011f\u0131 geleneksel sunucu davran\u0131\u015f\u0131na benzer. Ancak bu mod, yukar\u0131da bahsedilen performans ve \u00f6ng\u00f6r\u00fclebilirlik sorunlar\u0131n\u0131 geri getirebilir ve genellikle \u00fcretim ortamlar\u0131 i\u00e7in \u00f6nerilmez.<\/p>\n<div class=\"code-container\">\n<pre><code>\napiVersion: kubelet.config.k8s.io\/v1beta1\nkind: KubeletConfiguration\nmemorySwap:\n  swapBehavior: UnlimitedSwap\n<\/code><\/pre>\n<\/div>\n<p>Bu yap\u0131land\u0131rmay\u0131 uygulad\u0131ktan sonra, kubelet hizmetini yeniden ba\u015flatman\u0131z gerekecektir. \u00d6rne\u011fin, systemd kullanan bir Linux sisteminde:<\/p>\n<div class=\"code-container\">\n<pre><code>\nsudo systemctl daemon-reload\nsudo systemctl restart kubelet\n<\/code><\/pre>\n<\/div>\n<h3>3. Swap&#8217;\u0131 Tamamen Devre D\u0131\u015f\u0131 B\u0131rakma (NoSwap)<\/h3>\n<p>E\u011fer swap&#8217;\u0131n tamamen devre d\u0131\u015f\u0131 kalmas\u0131n\u0131 istiyorsan\u0131z (ki bu, Kubernetes&#8217;in eski varsay\u0131lan davran\u0131\u015f\u0131d\u0131r ve hala bir\u00e7ok \u00fcretim ortam\u0131nda tercih edilir), <code>swapBehavior<\/code>&#8216;\u0131 <code>NoSwap<\/code> olarak ayarlayabilirsiniz. Ancak, bu durumda d\u00fc\u011f\u00fcmde swap&#8217;\u0131n fiziksel olarak devre d\u0131\u015f\u0131 b\u0131rak\u0131ld\u0131\u011f\u0131ndan (<code>\/etc\/fstab<\/code>&#8216;dan kald\u0131r\u0131ld\u0131\u011f\u0131ndan) emin olman\u0131z gerekir.<\/p>\n<div class=\"code-container\">\n<pre><code>\napiVersion: kubelet.config.k8s.io\/v1beta1\nkind: KubeletConfiguration\nmemorySwap:\n  swapBehavior: NoSwap\n<\/code><\/pre>\n<\/div>\n<p>Bu yap\u0131land\u0131rmalar\u0131 uygularken dikkatli olmak \u00f6nemlidir. Yanl\u0131\u015f yap\u0131land\u0131rma, d\u00fc\u011f\u00fcm\u00fcn karars\u0131z \u00e7al\u0131\u015fmas\u0131na veya Kubernetes k\u00fcmesinin d\u00fczg\u00fcn \u00e7al\u0131\u015fmamas\u0131na neden olabilir. Her zaman de\u011fi\u015fiklikleri \u00f6nce bir test ortam\u0131nda denemek ve ard\u0131ndan \u00fcretim ortamlar\u0131na a\u015famal\u0131 olarak uygulamak en iyi yakla\u015f\u0131md\u0131r. Ayr\u0131ca, swap&#8217;\u0131 etkinle\u015ftirdikten sonra d\u00fc\u011f\u00fcm\u00fcn bellek ve swap kullan\u0131m\u0131n\u0131 yak\u0131ndan izlemek, olas\u0131 performans sorunlar\u0131n\u0131 erken tespit etmek i\u00e7in kritik \u00f6neme sahiptir. Bu yeni esneklik, Kubernetes&#8217;i daha geni\u015f bir yelpazedeki i\u015f y\u00fckleri i\u00e7in daha uyarlanabilir hale getirirken, ayn\u0131 zamanda y\u00f6neticilere daha fazla sorumluluk y\u00fcklemektedir.<\/p>\n<h2>Swap Kullan\u0131m\u0131n\u0131n Potansiyel Faydalar\u0131 ve Dikkat Edilmesi Gerekenler<\/h2>\n<p>Kubernetes&#8217;in swap deste\u011fini yeniden de\u011ferlendirmesi, bu \u00f6zelli\u011fin belirli senaryolarda potansiyel faydalar sunabilece\u011fi ger\u00e7e\u011fini ortaya koyuyor. Ancak, bu faydalar her zaman risklerle birlikte gelir ve swap&#8217;\u0131 etkinle\u015ftirmeden \u00f6nce dikkatli bir de\u011ferlendirme yapmak kritik \u00f6neme sahiptir.<\/p>\n<h3>Potansiyel Faydalar:<\/h3>\n<ol>\n<li><strong>Geli\u015ftirme ve Test Ortamlar\u0131:<\/strong> Geli\u015ftiriciler ve test m\u00fchendisleri genellikle s\u0131n\u0131rl\u0131 kaynaklara sahip makinelerde \u00e7al\u0131\u015f\u0131rlar. Bu ortamlarda, uygulamalar\u0131n ani bellek art\u0131\u015flar\u0131n\u0131 veya bellek s\u0131z\u0131nt\u0131lar\u0131n\u0131 tolere etmek i\u00e7in k\u00fc\u00e7\u00fck bir miktar swap alan\u0131, uygulaman\u0131n an\u0131nda \u00e7\u00f6kmesini engelleyebilir. Bu, geli\u015ftirme d\u00f6ng\u00fcs\u00fcn\u00fc h\u0131zland\u0131rabilir ve hata ay\u0131klama s\u00fcrecini kolayla\u015ft\u0131rabilir. \u00d6rne\u011fin, bir geli\u015ftiricinin yerel makinesinde \u00e7al\u0131\u015fan Kubernetes k\u00fcmesinde, swap&#8217;\u0131n etkin olmas\u0131, ayn\u0131 anda birden fazla bellek yo\u011fun uygulaman\u0131n geli\u015ftirilmesine olanak tan\u0131yabilir.<\/li>\n<li><strong>Bellek Yo\u011funlu\u011fu Dalgal\u0131 \u0130\u015f Y\u00fckleri:<\/strong> Baz\u0131 i\u015f y\u00fckleri, g\u00fcn\u00fcn belirli saatlerinde veya belirli olaylar s\u0131ras\u0131nda bellek kullan\u0131m\u0131nda ani ve k\u0131sa s\u00fcreli zirveler ya\u015fayabilir. Bu t\u00fcr &#8220;bursty&#8221; i\u015f y\u00fckleri i\u00e7in, swap&#8217;\u0131n s\u0131n\u0131rl\u0131 bir \u015fekilde etkinle\u015ftirilmesi, bu zirveleri RAM&#8217;e yeni bir pod eklemeden veya mevcut pod&#8217;u yeniden ba\u015flatmadan atlatmaya yard\u0131mc\u0131 olabilir. Bu, kaynak optimizasyonu sa\u011flayabilir, \u00e7\u00fcnk\u00fc her zaman en y\u00fcksek bellek ihtiyac\u0131na g\u00f6re RAM ay\u0131rmak yerine, ortalama ihtiyaca g\u00f6re RAM ay\u0131r\u0131p zirveleri swap ile y\u00f6netebilirsiniz.<\/li>\n<li><strong>Minimum Kesinti ile Bellek A\u015f\u0131m\u0131 Y\u00f6netimi:<\/strong> Swap, bir pod&#8217;un bellek limitini a\u015ft\u0131\u011f\u0131nda an\u0131nda OOM Killer taraf\u0131ndan sonland\u0131r\u0131lmas\u0131 yerine, yava\u015f\u00e7a swap&#8217;a d\u00fc\u015fmesine izin vererek daha yumu\u015fak bir ini\u015f sa\u011flayabilir. Bu, baz\u0131 durumlarda k\u0131sa s\u00fcreli performans d\u00fc\u015f\u00fc\u015f\u00fc pahas\u0131na uygulaman\u0131n \u00e7al\u0131\u015fmaya devam etmesini sa\u011flayarak kullan\u0131c\u0131 deneyimini iyile\u015ftirebilir. \u00d6zellikle ba\u015flat\u0131lmas\u0131 uzun s\u00fcren veya durum bilgisi olan uygulamalar i\u00e7in bu, anl\u0131k kesintileri \u00f6nlemede faydal\u0131 olabilir.<\/li>\n<li><strong>Daha Az Kaynak \u0130sraf\u0131:<\/strong> Her zaman en y\u00fcksek bellek ihtiyac\u0131na g\u00f6re RAM tahsis etmek yerine, swap&#8217;\u0131n kontroll\u00fc kullan\u0131m\u0131, fiziksel bellek kaynaklar\u0131n\u0131n daha verimli kullan\u0131lmas\u0131na olanak tan\u0131r. Bu, \u00f6zellikle b\u00fcy\u00fck k\u00fcmelerde maliyet tasarrufu sa\u011flayabilir.<\/li>\n<\/ol>\n<h3>Dikkat Edilmesi Gerekenler ve Riskler:<\/h3>\n<ol>\n<li><strong>Performans D\u00fc\u015f\u00fc\u015f\u00fc:<\/strong> En b\u00fcy\u00fck risk, swap&#8217;\u0131n disk I\/O&#8217;su kullanmas\u0131 nedeniyle ortaya \u00e7\u0131kan performans d\u00fc\u015f\u00fc\u015f\u00fcd\u00fcr. Bu, \u00f6zellikle d\u00fc\u015f\u00fck gecikme s\u00fcresi gerektiren veya y\u00fcksek i\u015flem hacimli uygulamalar i\u00e7in kabul edilemez olabilir. \u00dcretim ortamlar\u0131nda, performans d\u00fc\u015f\u00fc\u015fleri do\u011frudan i\u015f kayb\u0131na yol a\u00e7abilir.<\/li>\n<li><strong>Belirsiz Davran\u0131\u015f ve Hata Ay\u0131klama Zorlu\u011fu:<\/strong> Swap&#8217;\u0131n etkin olmas\u0131, pod&#8217;lar\u0131n ne zaman ve neden yava\u015flad\u0131\u011f\u0131n\u0131 anlamay\u0131 zorla\u015ft\u0131r\u0131r. OOM Killer&#8217;\u0131n tetiklenme mekanizmas\u0131 de\u011fi\u015fti\u011fi i\u00e7in, bellek sorunlar\u0131n\u0131n tespiti ve \u00e7\u00f6z\u00fcm\u00fc daha karma\u015f\u0131k hale gelir.<\/li>\n<li><strong>Kaynak \u0130zolasyonu Sorunlar\u0131:<\/strong> Swap kullan\u0131m\u0131, d\u00fc\u011f\u00fcmdeki disk I\/O&#8217;sunu art\u0131rarak di\u011fer pod&#8217;lar\u0131n performans\u0131n\u0131 olumsuz etkileyebilir. Bu &#8220;noisy neighbor&#8221; etkisi, k\u00fcmenin genel kararl\u0131l\u0131\u011f\u0131n\u0131 ve \u00f6ng\u00f6r\u00fclebilirli\u011fini bozar.<\/li>\n<li><strong>OOM Killer Etkile\u015fimi:<\/strong> Swap ile OOM Killer aras\u0131ndaki etkile\u015fim, uygulaman\u0131n beklenmedik \u015fekillerde davranmas\u0131na neden olabilir. Hangi pod&#8217;un \u00f6ld\u00fcr\u00fclece\u011fi veya ne zaman \u00f6ld\u00fcr\u00fclece\u011fi konusunda daha az \u00f6ng\u00f6r\u00fclebilirlik olu\u015fur.<\/li>\n<li><strong>\u0130zleme ve Y\u00f6netim Karma\u015f\u0131kl\u0131\u011f\u0131:<\/strong> Swap&#8217;\u0131 etkinle\u015ftirdi\u011finizde, d\u00fc\u011f\u00fcm ve pod baz\u0131nda swap kullan\u0131m\u0131n\u0131 izlemek i\u00e7in daha geli\u015fmi\u015f izleme ara\u00e7lar\u0131na ihtiyac\u0131n\u0131z olacakt\u0131r. Bu, operasyonel y\u00fck\u00fc art\u0131r\u0131r.<\/li>\n<\/ol>\n<p>Sonu\u00e7 olarak, Kubernetes&#8217;te swap&#8217;\u0131 etkinle\u015ftirme karar\u0131 dikkatlice d\u00fc\u015f\u00fcn\u00fclmelidir. Geli\u015ftirme ve test ortamlar\u0131 i\u00e7in cazip olsa da, \u00fcretim ortamlar\u0131nda genellikle performans, kararl\u0131l\u0131k ve \u00f6ng\u00f6r\u00fclebilirlik i\u00e7in swap&#8217;\u0131n devre d\u0131\u015f\u0131 b\u0131rak\u0131lmas\u0131 hala en g\u00fcvenli yakla\u015f\u0131md\u0131r. E\u011fer swap&#8217;\u0131 etkinle\u015ftirecekseniz, bunu <code>LimitedSwap<\/code> modunda ve s\u0131k\u0131 bir izleme alt\u0131nda yapman\u0131z \u015fiddetle tavsiye edilir.<\/p>\n<h2>Sonu\u00e7: Gelece\u011fin Kubernetes Ortamlar\u0131nda Swap&#8217;\u0131n Yeri<\/h2>\n<p>Kubernetes&#8217;in swap belle\u011fe kar\u015f\u0131 olan duru\u015fu, y\u0131llar i\u00e7inde \u00f6nemli bir evrim ge\u00e7irdi. Ba\u015flang\u0131\u00e7taki kat\u0131 &#8220;swap kesinlikle yasak&#8221; politikas\u0131ndan, kontroll\u00fc ve yap\u0131land\u0131r\u0131labilir bir &#8220;swap&#8217;a izin verilebilir&#8221; yakla\u015f\u0131m\u0131na ge\u00e7i\u015f, platformun olgunla\u015fmas\u0131n\u0131n ve farkl\u0131 kullan\u0131m senaryolar\u0131na uyum sa\u011flama \u00e7abas\u0131n\u0131n bir g\u00f6stergesidir. Bu d\u00f6n\u00fc\u015f\u00fcm, \u00f6zellikle Kubernetes 1.22 ile birlikte <code>kubelet<\/code> yap\u0131land\u0131rmas\u0131na eklenen <code>memorySwap<\/code> se\u00e7enekleriyle somutla\u015ft\u0131.<\/p>\n<p>Bu makale boyunca, Kubernetes&#8217;in swap&#8217;\u0131 neden ba\u015flang\u0131\u00e7ta devre d\u0131\u015f\u0131 b\u0131rakt\u0131\u011f\u0131n\u0131, performans \u00f6ng\u00f6r\u00fclebilirli\u011fi, kaynak izolasyonu ve hata ay\u0131klama karma\u015f\u0131kl\u0131\u011f\u0131 gibi temel nedenleri derinlemesine inceledik. Ayr\u0131ca, <code>kubeadm<\/code> kurulumunda kar\u015f\u0131la\u015f\u0131lan yayg\u0131n swap hatalar\u0131n\u0131 ve bunlar\u0131n nas\u0131l giderilece\u011fini pratik bir vaka analiziyle g\u00f6sterdik. Kubernetes toplulu\u011funun, swap&#8217;\u0131n potansiyel faydalar\u0131n\u0131 ve risklerini yeniden de\u011ferlendirerek, daha esnek bir yakla\u015f\u0131m benimsemesi, platformun daha geni\u015f bir yelpazedeki i\u015f y\u00fckleri ve ortamlar i\u00e7in uygun hale gelmesini sa\u011flam\u0131\u015ft\u0131r.<\/p>\n<p>Ancak, bu yeni esneklik beraberinde daha fazla sorumluluk getiriyor. Swap&#8217;\u0131 etkinle\u015ftirme karar\u0131, her zaman uygulaman\u0131n ve ortam\u0131n \u00f6zel ihtiya\u00e7lar\u0131 g\u00f6z \u00f6n\u00fcnde bulundurularak verilmelidir. Geli\u015ftirme ve test ortamlar\u0131nda swap, bellek sorunlar\u0131n\u0131 daha yumu\u015fak bir \u015fekilde y\u00f6netmeye yard\u0131mc\u0131 olabilirken, \u00fcretim ortamlar\u0131nda performans ve kararl\u0131l\u0131k \u00fczerindeki olumsuz etkileri nedeniyle hala dikkatli bir \u015fekilde de\u011ferlendirilmelidir. En iyi uygulama, swap&#8217;\u0131 m\u00fcmk\u00fcn oldu\u011funca devre d\u0131\u015f\u0131 b\u0131rakmak veya yaln\u0131zca kesinlikle gerekli oldu\u011funda ve <code>LimitedSwap<\/code> gibi kontroll\u00fc modlarda kullanmakt\u0131r. S\u00fcrekli izleme ve performans testleri, swap&#8217;\u0131n etkinle\u015ftirildi\u011fi ortamlarda vazge\u00e7ilmezdir.<\/p>\n<p>Gelecekte, Kubernetes&#8217;in swap y\u00f6netimi konusunda daha da geli\u015fmi\u015f ve ak\u0131ll\u0131 mekanizmalar sunmas\u0131 beklenebilir. Yapay zeka ve makine \u00f6\u011frenimi tabanl\u0131 kaynak y\u00f6netimi \u00e7\u00f6z\u00fcmleri, swap kullan\u0131m\u0131n\u0131 daha dinamik ve optimize edilmi\u015f bir \u015fekilde ele alabilir. Ancak \u015fimdilik, Kubernetes kullan\u0131c\u0131lar\u0131 olarak, swap&#8217;\u0131n hem potansiyel bir \u00e7\u00f6z\u00fcm hem de \u00f6nemli bir risk fakt\u00f6r\u00fc oldu\u011funu anlamal\u0131 ve buna g\u00f6re bilin\u00e7li kararlar vermeliyiz. Kubernetes&#8217;in temel felsefesi olan \u00f6ng\u00f6r\u00fclebilirlik ve istikrar, her zaman \u00f6ncelikli olmal\u0131d\u0131r.<\/p>\n<h2>S\u0131k\u00e7a Sorulan Sorular (SSS)<\/h2>\n<ul>\n<li>\n        <strong>S: Kubernetes neden ba\u015flang\u0131\u00e7ta swap&#8217;\u0131 devre d\u0131\u015f\u0131 b\u0131rakt\u0131?<\/strong><\/p>\n<p>C: Kubernetes, uygulamalar\u0131n performans\u0131n\u0131n \u00f6ng\u00f6r\u00fclebilirli\u011fini ve kaynak izolasyonunu sa\u011flamak amac\u0131yla swap&#8217;\u0131 ba\u015flang\u0131\u00e7ta devre d\u0131\u015f\u0131 b\u0131rakt\u0131. Swap, bellek yo\u011fun i\u015f y\u00fcklerinde performans\u0131 d\u00fc\u015f\u00fcrebilir, hata ay\u0131klamay\u0131 zorla\u015ft\u0131rabilir ve OOM Killer&#8217;\u0131n beklenen davran\u0131\u015f\u0131n\u0131 de\u011fi\u015ftirebilir.<\/p>\n<\/li>\n<li>\n        <strong>S: kubeadm ile kurulum yaparken &#8220;swap enabled&#8221; hatas\u0131 al\u0131rsam ne yapmal\u0131y\u0131m?<\/strong><\/p>\n<p>C: Bu hatay\u0131 al\u0131rsan\u0131z, <code>sudo swapoff -a<\/code> komutuyla swap&#8217;\u0131 ge\u00e7ici olarak devre d\u0131\u015f\u0131 b\u0131rak\u0131n ve <code>\/etc\/fstab<\/code> dosyas\u0131ndaki swap sat\u0131r\u0131n\u0131 yorum sat\u0131r\u0131 haline getirerek veya silerek kal\u0131c\u0131 olarak kapat\u0131n. Ard\u0131ndan kubeadm kurulumuna devam edebilirsiniz.<\/p>\n<\/li>\n<li>\n        <strong>S: Kubernetes&#8217;in hangi s\u00fcr\u00fcm\u00fcnden itibaren swap deste\u011fi geldi?<\/strong><\/p>\n<p>C: Kubernetes 1.22 s\u00fcr\u00fcm\u00fcnden itibaren, <code>kubelet<\/code> yap\u0131land\u0131rmas\u0131na eklenen <code>memorySwap<\/code> se\u00e7ene\u011fi ile swap deste\u011fi kontroll\u00fc bir \u015fekilde geri getirildi.<\/p>\n<\/li>\n<li>\n        <strong>S: Swap&#8217;\u0131 Kubernetes&#8217;te etkinle\u015ftirmek g\u00fcvenli midir?<\/strong><\/p>\n<p>C: Geli\u015ftirme ve test ortamlar\u0131nda belirli faydalar sa\u011flayabilirken, \u00fcretim ortamlar\u0131nda genellikle \u00f6nerilmez. Performans d\u00fc\u015f\u00fc\u015f\u00fc, belirsiz davran\u0131\u015f ve kaynak izolasyonu sorunlar\u0131 gibi ciddi riskler ta\u015f\u0131r. E\u011fer etkinle\u015ftirilirse, <code>LimitedSwap<\/code> modunda ve dikkatli izleme alt\u0131nda kullan\u0131lmas\u0131 tavsiye edilir.<\/p>\n<\/li>\n<li>\n        <strong>S: <code>LimitedSwap<\/code> ve <code>UnlimitedSwap<\/code> aras\u0131ndaki fark nedir?<\/strong><\/p>\n<p>C: <code>LimitedSwap<\/code>, kubelet&#8217;in swap kullanmas\u0131na izin verir ancak container&#8217;lar\u0131n bellek limitlerini a\u015fan kullan\u0131mlara \u00f6ncelik verir ve d\u00fc\u011f\u00fcm\u00fcn genel swap kullan\u0131m\u0131n\u0131 kontrol alt\u0131nda tutar. <code>UnlimitedSwap<\/code> ise swap kullan\u0131m\u0131na herhangi bir k\u0131s\u0131tlama getirmez ve geleneksel i\u015fletim sistemi davran\u0131\u015f\u0131na benzer, ancak daha fazla risk ta\u015f\u0131r.<\/p>\n<\/li>\n<\/ul>\n<p>#Kubernetes #SwapBellek #DevOps #kubeadm #Kubelet #Teknoloji #SistemY\u00f6netimi<\/p>\n","protected":false},"excerpt":{"rendered":"Kubernetes, modern uygulama geli\u015ftirme ve da\u011f\u0131t\u0131m s\u00fcre\u00e7lerinin vazge\u00e7ilmez bir par\u00e7as\u0131 haline geldi.","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_page_header_type":"","csco_page_load_nextpost":"","csco_page_subscribe_form":"","csco_page_contact_form":"","footnotes":""},"categories":[1491],"tags":[],"class_list":{"0":"post-44580","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-kubernetes","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.5 (Yoast SEO v25.3.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Kubernetes ve Swap: Varsay\u0131lan Olarak Neden Devre D\u0131\u015f\u0131 B\u0131rak\u0131ld\u0131 ve Bu Durum Nas\u0131l De\u011fi\u015fiyor? 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