{"id":38855,"date":"2026-02-09T11:30:39","date_gmt":"2026-02-09T08:30:39","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/catismasiz-kyverno-politikalari-tasarimi-mulkiyet-kapsam-ve-determinizm-icin-desenler\/"},"modified":"2026-02-09T11:30:39","modified_gmt":"2026-02-09T08:30:39","slug":"catismasiz-kyverno-politikalari-tasarimi-mulkiyet-kapsam-ve-determinizm-icin-desenler","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/catismasiz-kyverno-politikalari-tasarimi-mulkiyet-kapsam-ve-determinizm-icin-desenler\/","title":{"rendered":"\u00c7at\u0131\u015fmas\u0131z Kyverno Politikalar\u0131 Tasar\u0131m\u0131: M\u00fclkiyet, Kapsam ve Determinizm \u0130\u00e7in Desenler"},"content":{"rendered":"<h2>\u00c7at\u0131\u015fmas\u0131z Kyverno Politikalar\u0131 Tasar\u0131m\u0131: M\u00fclkiyet, Kapsam ve Determinizm \u0130\u00e7in Desenler<\/h2>\n<p>Kubernetes ortamlar\u0131nda g\u00fcvenlik, uyumluluk ve operasyonel tutarl\u0131l\u0131k sa\u011flamak i\u00e7in politika motorlar\u0131 vazge\u00e7ilmezdir. Kyverno, yerel Kubernetes kaynaklar\u0131 olarak politikalar\u0131 tan\u0131mlama yetene\u011fiyle bu alanda \u00f6ne \u00e7\u0131kar. Ancak, b\u00fcy\u00fck ve dinamik ortamlarda, birden fazla politika uyguland\u0131\u011f\u0131nda istenmeyen \u00e7at\u0131\u015fmalar ortaya \u00e7\u0131kabilir. Bu makale, Kyverno politikalar\u0131n\u0131 m\u00fclkiyet, kapsam ve determinizm prensiplerini temel alarak \u00e7at\u0131\u015fmas\u0131z bir \u015fekilde tasarlamak i\u00e7in pratik desenleri ve en iyi uygulamalar\u0131 ele alacakt\u0131r. Amac\u0131m\u0131z, hem g\u00fcvenli\u011fi art\u0131ran hem de operasyonel karma\u015f\u0131kl\u0131\u011f\u0131 azaltan sa\u011flam politika altyap\u0131lar\u0131 olu\u015fturmakt\u0131r.<\/p>\n<h3>Kyverno Politikalar\u0131nda \u00c7at\u0131\u015fma Nedenleri ve \u00d6nemi<\/h3>\n<p>Kyverno politikalar\u0131, Kubernetes kaynaklar\u0131n\u0131n olu\u015fturulmas\u0131, g\u00fcncellenmesi veya silinmesi s\u0131ras\u0131nda belirli kurallar\u0131 uygulamak i\u00e7in kullan\u0131l\u0131r. Bu kurallar, kaynaklar\u0131 do\u011frulayabilir (validate), de\u011fi\u015ftirebilir (mutate) veya yeni kaynaklar olu\u015fturabilir (generate). Ancak, birden fazla politikan\u0131n ayn\u0131 kaynak veya alan \u00fczerinde farkl\u0131 beklentilerle hareket etmesi durumunda \u00e7at\u0131\u015fmalar ka\u00e7\u0131n\u0131lmaz hale gelir.<\/p>\n<h4>\u00c7at\u0131\u015fma T\u00fcrleri ve Etkileri<\/h4>\n<p>\u00c7at\u0131\u015fmalar genellikle iki ana kategoriye ayr\u0131l\u0131r:<\/p>\n<ul>\n<li><b>Mutasyon \u00c7at\u0131\u015fmalar\u0131:<\/b> \u0130ki veya daha fazla mutate politikas\u0131n\u0131n ayn\u0131 kaynak \u00fczerinde ayn\u0131 alan\u0131 farkl\u0131 de\u011ferlerle de\u011fi\u015ftirmeye \u00e7al\u0131\u015fmas\u0131. \u00d6rne\u011fin, bir politika bir etiketi <code>env: prod<\/code> yaparken, di\u011feri <code>env: dev<\/code> yapmaya \u00e7al\u0131\u015fabilir. Bu durum, kayna\u011f\u0131n beklenmedik bir duruma gelmesine veya Kyverno&#8217;nun hata vermesine neden olabilir.<\/li>\n<li><b>Do\u011frulama (Validation) \u00c7at\u0131\u015fmalar\u0131:<\/b> Bir politika bir kayna\u011fa izin verirken, ba\u015fka bir politikan\u0131n ayn\u0131 kayna\u011f\u0131 reddetmesi. Bu genellikle bir kayna\u011f\u0131n olu\u015fturulmas\u0131n\u0131 veya g\u00fcncellenmesini engeller ve geli\u015ftiriciler i\u00e7in kafa kar\u0131\u015f\u0131kl\u0131\u011f\u0131 yarat\u0131r.<\/li>\n<li><b>\u00dcretim (Generation) \u00c7at\u0131\u015fmalar\u0131:<\/b> \u0130ki generate politikas\u0131n\u0131n ayn\u0131 anda ayn\u0131 kayna\u011f\u0131 olu\u015fturmaya \u00e7al\u0131\u015fmas\u0131 veya olu\u015fturulan kaynaklar \u00fczerinde farkl\u0131 beklentilere sahip olmas\u0131.<\/li>\n<\/ul>\n<p>Bu \u00e7at\u0131\u015fmalar, da\u011f\u0131t\u0131mlar\u0131n ba\u015far\u0131s\u0131z olmas\u0131na, uygulamalar\u0131n karars\u0131z \u00e7al\u0131\u015fmas\u0131na ve hata ay\u0131klama s\u00fcre\u00e7lerinin uzamas\u0131na yol a\u00e7arak operasyonel verimlili\u011fi ciddi \u015fekilde d\u00fc\u015f\u00fcr\u00fcr.<\/p>\n<h4>Neden \u00c7at\u0131\u015fmas\u0131z Tasar\u0131m Kritik?<\/h4>\n<p>\u00c7at\u0131\u015fmas\u0131z politika tasar\u0131m\u0131, Kubernetes ortamlar\u0131nda \u00f6ng\u00f6r\u00fclebilirlik ve g\u00fcvenilirlik sa\u011flar. Geli\u015ftiriciler, uygulamalar\u0131n\u0131n hangi kurallara tabi oldu\u011funu bilir ve buna g\u00f6re hareket edebilirler. Operasyon ekipleri ise politika hatalar\u0131ndan kaynaklanan kesintilerle daha az u\u011fra\u015f\u0131r. Bu, DevOps k\u00fclt\u00fcr\u00fcn\u00fcn temelini olu\u015fturan h\u0131zl\u0131 geri bildirim d\u00f6ng\u00fclerini ve s\u00fcrekli entegrasyon\/s\u00fcrekli teslimat (CI\/CD) s\u00fcre\u00e7lerini destekler.<\/p>\n<h3>M\u00fclkiyet (Ownership) Odakl\u0131 Politika Tasar\u0131m\u0131<\/h3>\n<p>Politikalar\u0131n kimin sorumlulu\u011funda oldu\u011funu ve hangi kaynaklar\u0131 etkiledi\u011fini net bir \u015fekilde tan\u0131mlamak, \u00e7at\u0131\u015fmalar\u0131 \u00f6nlemenin ilk ad\u0131m\u0131d\u0131r. M\u00fclkiyet, politikalar\u0131n kapsam\u0131n\u0131 ve hedefini belirlemede kilit rol oynar.<\/p>\n<h4>Namespace Bazl\u0131 M\u00fclkiyet<\/h4>\n<p>En yayg\u0131n ve etkili m\u00fclkiyet desenlerinden biri, politikalar\u0131 Kubernetes namespace&#8217;lerine g\u00f6re ay\u0131rmakt\u0131r. Bir namespace genellikle belirli bir tak\u0131m, uygulama veya ortamla ili\u015fkilidir.<\/p>\n<pre><code class=\"language-yaml\">\napiVersion: kyverno.io\/v1\nkind: ClusterPolicy\nmetadata:\n  name: enforce-resource-quotas-dev\nspec:\n  validationFailureAction: Enforce\n  rules:\n  - name: require-resource-quotas\n    match:\n      any:\n      - resources:\n          kinds:\n          - Pod\n          namespaces:\n          - \"dev-*\" # Sadece 'dev-' ile ba\u015flayan namespace'leri hedefler\n    validate:\n      message: \"Pods in dev namespaces must have resource limits and requests.\"\n      pattern:\n        spec:\n          containers:\n          - resources:\n              limits:\n                memory: \"?*\"\n                cpu: \"?*\"\n              requests:\n                memory: \"?*\"\n                cpu: \"?*\"\n<\/pre>\n<p><\/code><br \/>\nBu \u00f6rnekte, politika sadece <code>dev-<\/code> \u00f6nekiyle ba\u015flayan namespace'lerdeki Pod'lar\u0131 hedefler. Bu sayede, geli\u015ftirme ekipleri kendi namespace'lerindeki kaynaklar\u0131 y\u00f6netirken, \u00fcretim ekipleri kendi politikalar\u0131n\u0131 ba\u011f\u0131ms\u0131zca uygulayabilir.<\/p>\n<h4>Tak\u0131m\/Uygulama Bazl\u0131 M\u00fclkiyet Etiketleri<\/h4>\n<p>Daha gran\u00fcler kontrol i\u00e7in, politikalar\u0131 belirli etiketlere sahip kaynaklara uygulamak m\u00fcmk\u00fcnd\u00fcr. Bu, farkl\u0131 tak\u0131mlar\u0131n veya uygulamalar\u0131n kendi \u00f6zel politika setlerine sahip olmas\u0131n\u0131 sa\u011flar.<\/p>\n<pre><code class=\"language-yaml\">\napiVersion: kyverno.io\/v1\nkind: ClusterPolicy\nmetadata:\n  name: enforce-team-a-image-registry\nspec:\n  validationFailureAction: Enforce\n  rules:\n  - name: require-team-a-registry\n    match:\n      any:\n      - resources:\n          kinds:\n          - Pod\n          selector:\n            matchLabels:\n              app.kubernetes.io\/team: team-a # Sadece 'team-a' etiketine sahip Pod'lar\u0131 hedefler\n    validate:\n      message: \"Team A applications must use images from approved-registry.com.\"\n      pattern:\n        spec:\n          containers:\n          - image: \"approved-registry.com\/*\"\n<\/pre>\n<p><\/code><br \/>\nBu yakla\u015f\u0131m, bir kayna\u011f\u0131n hangi tak\u0131ma ait oldu\u011funu belirten bir etiketle politikalar\u0131 ili\u015fkilendirerek, tak\u0131mlar aras\u0131 \u00e7at\u0131\u015fmalar\u0131 azalt\u0131r.<\/p>\n<h4>K\u00fcme Geneli ve Namespace Kapsaml\u0131 Politikalar<\/h4>\n<p>Kyverno, <code>ClusterPolicy<\/code> ve <code>Policy<\/code> olmak \u00fczere iki t\u00fcr politika sunar.<\/p>\n<ul>\n<li><b>ClusterPolicy:<\/b> T\u00fcm k\u00fcmeyi etkileyen genel kurallar i\u00e7in kullan\u0131l\u0131r (\u00f6rne\u011fin, t\u00fcm Pod'lar\u0131n kaynak limitlerine sahip olmas\u0131).<\/li>\n<li><b>Policy (Namespaced Policy):<\/b> Belirli bir namespace i\u00e7indeki kaynaklar\u0131 etkileyen kurallar i\u00e7in kullan\u0131l\u0131r (\u00f6rne\u011fin, <code>dev<\/code> namespace'indeki t\u00fcm Pod'lar\u0131n belirli bir g\u00f6r\u00fcnt\u00fc etiketine sahip olmas\u0131).<\/li>\n<\/ul>\n<p>Bu ayr\u0131m, m\u00fclkiyeti netle\u015ftirir. K\u00fcme y\u00f6neticileri <code>ClusterPolicy<\/code>'leri y\u00f6netirken, tak\u0131m liderleri veya uygulama sahipleri kendi namespace'leri i\u00e7in <code>Policy<\/code>'leri tan\u0131mlayabilir. Genel kurallar genellikle daha k\u0131s\u0131tlay\u0131c\u0131d\u0131r ve namespace bazl\u0131 kurallar taraf\u0131ndan geni\u015fletilebilir veya daha spesifik hale getirilebilir.<\/p>\n<h3>Kapsam (Scope) Y\u00f6netimi ile \u00c7at\u0131\u015fmalar\u0131 \u00d6nleme<\/h3>\n<p>Bir politikan\u0131n ne kadar geni\u015f bir alan\u0131 etkileyece\u011fini belirlemek, \u00e7at\u0131\u015fmalar\u0131 \u00f6nlemede hayati \u00f6neme sahiptir. Kapsam\u0131 do\u011fru y\u00f6netmek, politikalar\u0131n sadece hedeflenen kaynaklar \u00fczerinde i\u015flem yapmas\u0131n\u0131 sa\u011flar.<\/p>\n<h4>Kaynak Se\u00e7iciler (match\/exclude)<\/h4>\n<p>Kyverno'nun <code>match<\/code> ve <code>exclude<\/code> bloklar\u0131, politikalar\u0131n uygulanaca\u011f\u0131 kaynaklar\u0131 hassas bir \u015fekilde belirlemek i\u00e7in kullan\u0131l\u0131r. Bu bloklar, kaynak t\u00fcr\u00fc, ad\u0131, namespace'i veya etiketleri gibi \u00e7e\u015fitli kriterlere g\u00f6re filtreleme yapabilir.<\/p>\n<pre><code class=\"language-yaml\">\napiVersion: kyverno.io\/v1\nkind: ClusterPolicy\nmetadata:\n  name: disallow-privileged-containers\nspec:\n  validationFailureAction: Enforce\n  rules:\n  - name: no-privileged-containers\n    match:\n      any:\n      - resources:\n          kinds:\n          - Pod\n          namespaces:\n          - \"prod-*\" # Sadece 'prod-' ile ba\u015flayan namespace'lerdeki Pod'lar\u0131 hedefler\n    exclude:\n      any:\n      - resources:\n          selector:\n            matchLabels:\n              kyverno.io\/exempt: \"true\" # 'kyverno.io\/exempt: true' etiketine sahip Pod'lar\u0131 hari\u00e7 tutar\n    validate:\n      message: \"Privileged containers are not allowed in production namespaces.\"\n      pattern:\n        spec:\n          containers:\n          - securityContext:\n              privileged: \"false\" # veya yok\n<\/pre>\n<p><\/code><br \/>\nBu \u00f6rnek, <code>prod-<\/code> namespace'lerindeki Pod'larda ayr\u0131cal\u0131kl\u0131 kapsay\u0131c\u0131lara izin vermez, ancak <code>kyverno.io\/exempt: true<\/code> etiketine sahip Pod'lar\u0131 bu kuraldan muaf tutar. Bu, belirli istisnalar\u0131 y\u00f6netmek i\u00e7in g\u00fc\u00e7l\u00fc bir mekanizmad\u0131r.<\/p>\n<h4>Etiket Se\u00e7iciler ile Gran\u00fcler Kontrol<\/h4>\n<p>Etiketler, Kubernetes'te kaynaklar\u0131 d\u00fczenlemenin temel bir yoludur ve Kyverno politikalar\u0131nda da g\u00fc\u00e7l\u00fc bir filtreleme arac\u0131 olarak kullan\u0131labilir.<\/p>\n<pre><code class=\"language-yaml\">\napiVersion: kyverno.io\/v1\nkind: ClusterPolicy\nmetadata:\n  name: require-cost-center-label\nspec:\n  validationFailureAction: Enforce\n  rules:\n  - name: check-cost-center-label\n    match:\n      any:\n      - resources:\n          kinds:\n          - Deployment\n          selector:\n            matchLabels:\n              environment: production # Sadece 'environment: production' etiketine sahip Deployment'lar\u0131 hedefler\n    validate:\n      message: \"Production Deployments must have a 'cost-center' label.\"\n      pattern:\n        metadata:\n          labels:\n            cost-center: \"?*\"\n<\/pre>\n<p><\/code><br \/>\nBu politika, yaln\u0131zca <code>environment: production<\/code> etiketine sahip Deployment'lar\u0131n <code>cost-center<\/code> etiketine sahip olmas\u0131n\u0131 zorunlu k\u0131lar. Bu, politikalar\u0131n sadece ilgili kaynak gruplar\u0131na uygulanmas\u0131n\u0131 sa\u011flayarak gereksiz \u00e7at\u0131\u015fmalar\u0131 \u00f6nler.<\/p>\n<h4>Admission Control A\u015famalar\u0131 (validate\/mutate\/generate)<\/h4>\n<p>Kyverno, Kubernetes'in admission webhook mekanizmas\u0131n\u0131 kullanarak kaynaklar \u00fczerinde i\u015flem yapar. Bu i\u015flemler belirli a\u015famalarda ger\u00e7ekle\u015fir:<\/p>\n<ul>\n<li><b>Mutate:<\/b> Kaynak olu\u015fturulmadan veya g\u00fcncellenmeden \u00f6nce de\u011fi\u015ftirilir.<\/li>\n<li><b>Validate:<\/b> Kayna\u011f\u0131n belirli kurallara uygun olup olmad\u0131\u011f\u0131 kontrol edilir. Uyumsuzsa reddedilir.<\/li>\n<li><b>Generate:<\/b> Bir kaynak olu\u015fturuldu\u011funda veya g\u00fcncellendi\u011finde, ba\u015fka bir kaynak olu\u015fturulur.<\/li>\n<\/ul>\n<p>Bu a\u015famalar\u0131n s\u0131ras\u0131n\u0131 anlamak \u00f6nemlidir. Mutate politikalar\u0131 \u00f6nce \u00e7al\u0131\u015f\u0131r, ard\u0131ndan validate politikalar\u0131. E\u011fer bir kaynak mutate politikalar\u0131 taraf\u0131ndan de\u011fi\u015ftirilirse, validate politikalar\u0131 bu de\u011fi\u015ftirilmi\u015f kayna\u011f\u0131 de\u011ferlendirir. \u00c7at\u0131\u015fmalar\u0131 \u00f6nlemek i\u00e7in, mutate politikalar\u0131n\u0131n idempotent (birden fazla kez uyguland\u0131\u011f\u0131nda ayn\u0131 sonucu veren) olmas\u0131 ve validate politikalar\u0131n\u0131n mutate'den sonra beklenen duruma uygun olup olmad\u0131\u011f\u0131n\u0131 kontrol etmesi \u00f6nemlidir.<\/p>\n<h3>Determinizm (Determinism) Sa\u011flama Y\u00f6ntemleri<\/h3>\n<p>Determinizm, bir politikan\u0131n her zaman \u00f6ng\u00f6r\u00fclebilir ve tutarl\u0131 sonu\u00e7lar \u00fcretmesini sa\u011flamak anlam\u0131na gelir. Kyverno politikalar\u0131nda determinizmi sa\u011flamak, beklenmedik davran\u0131\u015flar\u0131 ve \u00e7at\u0131\u015fmalar\u0131 ortadan kald\u0131rmak i\u00e7in kritik \u00f6neme sahiptir.<\/p>\n<h4>Politika S\u0131ralamas\u0131 ve \u00d6nceliklendirme<\/h4>\n<p>Kyverno, politikalar\u0131 belirli bir s\u0131raya g\u00f6re i\u015fler. ClusterPolicy'ler ve Namespaced Policy'ler kendi aralar\u0131nda alfabetik olarak (isimlerine g\u00f6re) i\u015flenir. Ayn\u0131 kaynak \u00fczerinde birden fazla politika varsa, bu s\u0131ralama sonucu etkileyebilir. \u00d6zellikle mutate politikalar\u0131nda, bir politikan\u0131n yapt\u0131\u011f\u0131 de\u011fi\u015fikli\u011fi ba\u015fka bir politika bozabilir.<\/p>\n<pre><code class=\"language-yaml\">\n# Politika A: default-labels (isim alfabetik olarak \u00f6nce gelir)\napiVersion: kyverno.io\/v1\nkind: ClusterPolicy\nmetadata:\n  name: default-labels\nspec:\n  rules:\n  - name: add-default-app-label\n    match:\n      any:\n      - resources:\n          kinds:\n          - Pod\n    mutate:\n      patchStrategicMerge:\n        metadata:\n          labels:\n            app: default-app\n\n# Politika B: override-app-label\napiVersion: kyverno.io\/v1\nkind: ClusterPolicy\nmetadata:\n  name: override-app-label\nspec:\n  rules:\n  - name: override-app-label-for-special-pods\n    match:\n      any:\n      - resources:\n          kinds:\n          - Pod\n          selector:\n            matchLabels:\n              type: special\n    mutate:\n      patchStrategicMerge:\n        metadata:\n          labels:\n            app: special-app\n<\/pre>\n<p><\/code><br \/>\nBu \u00f6rnekte, <code>default-labels<\/code> politikas\u0131 alfabetik olarak \u00f6nce i\u015flenir ve <code>app: default-app<\/code> etiketini ekler. Ard\u0131ndan <code>override-app-label<\/code> politikas\u0131, <code>type: special<\/code> etiketine sahip Pod'lar i\u00e7in <code>app<\/code> etiketini <code>special-app<\/code> olarak g\u00fcnceller. Bu s\u0131ralama, beklenen sonucu verir. Ancak, e\u011fer <code>override-app-label<\/code> daha genel olsayd\u0131 ve <code>default-labels<\/code> daha spesifik olsayd\u0131, istenmeyen sonu\u00e7lar ortaya \u00e7\u0131kabilirdi. Bu nedenle, genelden \u00f6zele do\u011fru bir s\u0131ralama veya daha spesifik politikalar\u0131n daha sonra i\u015flenmesini sa\u011flayacak isim kurallar\u0131 belirlemek faydal\u0131 olabilir.<\/p>\n<h4>Mutate Politikas\u0131 En \u0130yi Uygulamalar\u0131<\/h4>\n<p>Mutate politikalar\u0131 tasarlarken determinizmi sa\u011flamak i\u00e7in a\u015fa\u011f\u0131daki noktalara dikkat etmek \u00f6nemlidir:<\/p>\n<ul>\n<li><b>Idempotent Olun:<\/b> Bir mutate politikas\u0131, ayn\u0131 kaynak \u00fczerinde birden fazla kez uyguland\u0131\u011f\u0131nda ayn\u0131 sonucu vermelidir. \u00d6rne\u011fin, bir alan\u0131n de\u011ferini belirli bir de\u011fere ayarlamak (set) idempotenttir, ancak bir listeye her zaman yeni bir \u00f6\u011fe eklemek (append) de\u011fildir.<\/li>\n<li><b>Patch Stratejilerini Anlay\u0131n:<\/b> Kyverno, <code>patchStrategicMerge<\/code>, <code>jsonPatch<\/code> ve <code>overlay<\/code> gibi farkl\u0131 patch stratejileri sunar. <code>patchStrategicMerge<\/code>, Kubernetes'in kendi yama stratejisini kullanarak ak\u0131ll\u0131 bir birle\u015ftirme yapar ve genellikle en g\u00fcvenli se\u00e7enektir. <code>jsonPatch<\/code> daha g\u00fc\u00e7l\u00fcd\u00fcr ancak dikkatli kullan\u0131lmal\u0131d\u0131r.<\/li>\n<li><b>Hedefi Netle\u015ftirin:<\/b> Mutate politikalar\u0131, belirli bir amac\u0131 ger\u00e7ekle\u015ftirmeli ve gereksiz de\u011fi\u015fikliklerden ka\u00e7\u0131nmal\u0131d\u0131r. \u00d6rne\u011fin, sadece belirli bir etiketin eksik olmas\u0131 durumunda ekleme yap\u0131n.<\/li>\n<\/ul>\n<pre><code class=\"language-yaml\">\n# Idempotent Mutate \u00d6rne\u011fi: E\u011fer yoksa etiket ekle\napiVersion: kyverno.io\/v1\nkind: ClusterPolicy\nmetadata:\n  name: add-missing-owner-label\nspec:\n  rules:\n  - name: add-owner-label\n    match:\n      any:\n      - resources:\n          kinds:\n          - Deployment\n    mutate:\n      patchStrategicMerge:\n        metadata:\n          labels:\n            # E\u011fer 'owner' etiketi yoksa ekle, varsa dokunma\n            owner: \"{{ coalesce(request.object.metadata.labels.owner, 'unknown') }}\"\n<\/pre>\n<p><\/code><\/p>\n<h4>Validate Politikas\u0131 En \u0130yi Uygulamalar\u0131<\/h4>\n<p>Validate politikalar\u0131, kaynaklar\u0131n belirli kurallara uygunlu\u011funu kontrol eder ve uyumsuz kaynaklar\u0131 reddeder. Determinizm a\u00e7\u0131s\u0131ndan:<\/p>\n<ul>\n<li><b>A\u00e7\u0131k ve Kesin Kurallar:<\/b> Validate kurallar\u0131, neye izin verildi\u011fini veya neyin reddedildi\u011fini a\u00e7\u0131k\u00e7a belirtmelidir. Belirsiz kurallar, yanl\u0131\u015f pozitiflere veya yanl\u0131\u015f negatiflere yol a\u00e7abilir.<\/li>\n<li><b>Mesajlar\u0131 Netle\u015ftirin:<\/b> Politika ba\u015far\u0131s\u0131z oldu\u011funda kullan\u0131c\u0131ya g\u00f6sterilen mesajlar, hatan\u0131n nedenini ve nas\u0131l d\u00fczeltilece\u011fini a\u00e7\u0131k\u00e7a belirtmelidir.<\/li>\n<li><b>Deny \u00d6nceli\u011fi:<\/b> \u00c7at\u0131\u015fma durumlar\u0131nda, bir kayna\u011f\u0131n reddedilmesi genellikle en g\u00fcvenli varsay\u0131land\u0131r. E\u011fer birden fazla validate politikas\u0131 varsa ve biri reddederken di\u011feri izin veriyorsa, Kyverno kayna\u011f\u0131 reddeder.<\/li>\n<\/ul>\n<h4>Generate Politikas\u0131 En \u0130yi Uygulamalar\u0131<\/h4>\n<p>Generate politikalar\u0131, bir kaynak olu\u015fturuldu\u011funda veya g\u00fcncellendi\u011finde ba\u015fka bir kaynak olu\u015fturur. \u00c7at\u0131\u015fmas\u0131z ve deterministik generate politikalar\u0131 i\u00e7in:<\/p>\n<ul>\n<li><b>Tekil Sorumluluk:<\/b> Her generate politikas\u0131, belirli bir ama\u00e7 i\u00e7in tek bir kaynak t\u00fcr\u00fcn\u00fc veya belirli bir kaynak grubunu olu\u015fturmaktan sorumlu olmal\u0131d\u0131r.<\/li>\n<li><b>Hedef Kayna\u011f\u0131 Belirleyin:<\/b> Generate edilen kayna\u011f\u0131n ad\u0131n\u0131 ve namespace'ini a\u00e7\u0131k\u00e7a belirtin. \u00c7ak\u0131\u015fan adlar, kaynak olu\u015fturma hatalar\u0131na yol a\u00e7ar.<\/li>\n<li><b>G\u00fcncelleme Stratejisi:<\/b> Generate edilen kaynaklar\u0131n nas\u0131l g\u00fcncellenece\u011fini (\u00f6rne\u011fin, <code>synchronize: true<\/code> ile) d\u00fc\u015f\u00fcn\u00fcn. Bu, orijinal kaynakta yap\u0131lan de\u011fi\u015fikliklerin generate edilen kayna\u011fa yans\u0131t\u0131lmas\u0131n\u0131 sa\u011flar.<\/li>\n<\/ul>\n<h3>Ortak \u00c7at\u0131\u015fma Senaryolar\u0131 ve \u00c7\u00f6z\u00fcmleri<\/h3>\n<p>Kyverno politikalar\u0131yla \u00e7al\u0131\u015f\u0131rken kar\u015f\u0131la\u015f\u0131lan baz\u0131 yayg\u0131n \u00e7at\u0131\u015fma senaryolar\u0131 ve bunlar\u0131n nas\u0131l \u00e7\u00f6z\u00fclebilece\u011fi a\u015fa\u011f\u0131da a\u00e7\u0131klanm\u0131\u015ft\u0131r.<\/p>\n<h4>\u00c7ak\u0131\u015fan Mutate Kurallar\u0131<\/h4>\n<p>\u0130ki mutate politikas\u0131n\u0131n ayn\u0131 alan\u0131 farkl\u0131 de\u011ferlerle de\u011fi\u015ftirmeye \u00e7al\u0131\u015fmas\u0131 en yayg\u0131n \u00e7at\u0131\u015fmalardan biridir.<\/p>\n<pre><code class=\"language-yaml\">\n# Politika 1: default-env-label\napiVersion: kyverno.io\/v1\nkind: ClusterPolicy\nmetadata:\n  name: default-env-label\nspec:\n  rules:\n  - name: add-default-env\n    match:\n      any:\n      - resources:\n          kinds:\n          - Deployment\n    mutate:\n      patchStrategicMerge:\n        metadata:\n          labels:\n            env: dev\n\n# Politika 2: prod-env-label\napiVersion: kyverno.io\/v1\nkind: ClusterPolicy\nmetadata:\n  name: prod-env-label\nspec:\n  rules:\n  - name: add-prod-env\n    match:\n      any:\n      - resources:\n          kinds:\n          - Deployment\n          selector:\n            matchLabels:\n              stage: production\n    mutate:\n      patchStrategicMerge:\n        metadata:\n          labels:\n            env: prod\n<\/pre>\n<p><\/code><br \/>\nE\u011fer bir Deployment hem <code>stage: production<\/code> etiketine sahipse hem de genel bir Deployment ise, hangi <code>env<\/code> etiketinin uygulanaca\u011f\u0131 politika isimlerinin alfabetik s\u0131ras\u0131na g\u00f6re belirlenir. Bu durumda, <code>default-env-label<\/code> \u00f6nce \u00e7al\u0131\u015f\u0131r, ard\u0131ndan <code>prod-env-label<\/code> onu ge\u00e7ersiz k\u0131lar.<br \/>\n<b>\u00c7\u00f6z\u00fcm:<\/b> Daha spesifik kurallar\u0131n daha genel kurallar\u0131 ge\u00e7ersiz k\u0131lmas\u0131 bekleniyorsa, isim s\u0131ralamas\u0131na g\u00fcvenmek yerine <code>exclude<\/code> bloklar\u0131 veya daha karma\u015f\u0131k <code>match<\/code> ko\u015fullar\u0131 kullanarak politikalar\u0131n kapsam\u0131n\u0131 net bir \u015fekilde ay\u0131rmak daha g\u00fcvenlidir. \u00d6rne\u011fin, <code>default-env-label<\/code> politikas\u0131na <code>exclude<\/code> blo\u011fu ekleyerek <code>stage: production<\/code> etiketine sahip Deployment'lar\u0131 hari\u00e7 tutabilirsiniz.<\/p>\n<h4>Deny ve Mutate \u00c7at\u0131\u015fmalar\u0131<\/h4>\n<p>Bir kaynak mutate edildikten sonra, validate politikalar\u0131 taraf\u0131ndan reddedilebilir. Bu bir \u00e7at\u0131\u015fma de\u011fildir, ancak istenmeyen bir sonu\u00e7tur.<br \/>\n<b>Senaryo:<\/b> Bir mutate politikas\u0131 bir Pod'a belirli bir kaynak limiti eklerken, ba\u015fka bir validate politikas\u0131 bu limitlerin belirli bir e\u015fi\u011fin alt\u0131nda olmas\u0131n\u0131 zorunlu k\u0131lar. Mutate politikas\u0131 yanl\u0131\u015fl\u0131kla \u00e7ok d\u00fc\u015f\u00fck bir limit eklerse, validate politikas\u0131 Pod'u reddeder.<br \/>\n<b>\u00c7\u00f6z\u00fcm:<\/b> Mutate politikalar\u0131n\u0131 tasarlarken, validate politikalar\u0131n\u0131n beklentilerini g\u00f6z \u00f6n\u00fcnde bulundurun. Mutate politikalar\u0131, validate politikalar\u0131n\u0131n ge\u00e7mesini sa\u011flayacak \u015fekilde kaynaklar\u0131 d\u00f6n\u00fc\u015ft\u00fcrmelidir. Politika raporlar\u0131 (Policy Reports) bu t\u00fcr etkile\u015fimleri anlamak i\u00e7in faydal\u0131d\u0131r.<\/p>\n<h4>\u00c7oklu Politika Uygulamalar\u0131<\/h4>\n<p>Bir Kubernetes k\u00fcmesinde y\u00fczlerce politika bulunabilir. Bunlar\u0131n y\u00f6netimi ba\u015fl\u0131 ba\u015f\u0131na bir zorluktur.<br \/>\n<b>\u00c7\u00f6z\u00fcm:<\/b><\/p>\n<ul>\n<li><b>Politika Setleri:<\/b> \u0130lgili politikalar\u0131 mant\u0131ksal gruplar halinde d\u00fczenleyin. \u00d6rne\u011fin, \"g\u00fcvenlik politikalar\u0131\", \"uyumluluk politikalar\u0131\", \"uygulama \u00f6zel politikalar\u0131\".<\/li>\n<li><b>Adland\u0131rma Kurallar\u0131:<\/b> Politikalar i\u00e7in tutarl\u0131 adland\u0131rma kurallar\u0131 kullan\u0131n (\u00f6rn: <code>team-appname-rule-description<\/code>). Bu, politikalar\u0131n amac\u0131n\u0131 ve kapsam\u0131n\u0131 h\u0131zl\u0131ca anlamaya yard\u0131mc\u0131 olur.<\/li>\n<li><b>Versiyonlama:<\/b> Politikalar\u0131 Git gibi bir versiyon kontrol sisteminde y\u00f6netin ve CI\/CD s\u00fcre\u00e7leriyle otomatik olarak da\u011f\u0131t\u0131n.<\/li>\n<\/ul>\n<h3>Geli\u015fmi\u015f Stratejiler ve En \u0130yi Uygulamalar<\/h3>\n<p>\u00c7at\u0131\u015fmas\u0131z Kyverno politikalar\u0131 tasarlamak i\u00e7in baz\u0131 ileri d\u00fczey stratejiler ve genel en iyi uygulamalar \u015funlard\u0131r:<\/p>\n<h4>Politika Setleri ve Politika Raporlar\u0131<\/h4>\n<p>Kyverno, politikalar\u0131n uygulanma sonu\u00e7lar\u0131n\u0131 g\u00f6rmek i\u00e7in <code>PolicyReport<\/code> ve <code>ClusterPolicyReport<\/code> kaynaklar\u0131n\u0131 sa\u011flar. Bu raporlar, hangi kaynaklar\u0131n hangi politikalar taraf\u0131ndan etkilendi\u011fini, ba\u015far\u0131l\u0131 olup olmad\u0131\u011f\u0131n\u0131 veya reddedildi\u011fini g\u00f6sterir.<\/p>\n<pre><code class=\"language-bash\">\nkubectl get policyreport -n my-app-namespace\nkubectl get clusterpolicyreport\n<\/pre>\n<p><\/code><br \/>\nBu raporlar\u0131 d\u00fczenli olarak incelemek, potansiyel \u00e7at\u0131\u015fmalar\u0131 veya istenmeyen politika etkile\u015fimlerini erken a\u015famada tespit etmenizi sa\u011flar.<\/p>\n<h4>Dry Run ve Test S\u00fcre\u00e7leri<\/h4>\n<p>Politikalar\u0131 \u00fcretime almadan \u00f6nce test etmek hayati \u00f6nem ta\u015f\u0131r. Kyverno, <code>dry run<\/code> modunu destekler.<\/p>\n<pre><code class=\"language-bash\">\n# Bir kayna\u011f\u0131 dry run modunda olu\u015fturarak politikalar\u0131n nas\u0131l etki edece\u011fini g\u00f6r\u00fcn\nkubectl apply -f my-resource.yaml --dry-run=server -o yaml\n<\/pre>\n<p><\/code><br \/>\nAyr\u0131ca, Kyverno CLI arac\u0131 ile politikalar\u0131 yerel olarak test edebilirsiniz.<\/p>\n<pre><code class=\"language-bash\">\n# Politika ve kaynak dosyalar\u0131n\u0131 kullanarak test etme\nkyverno test policies\/ my-resources\/\n<\/pre>\n<p><\/code><br \/>\nBu testler, bir politikan\u0131n beklenen davran\u0131\u015f\u0131 sergileyip sergilemedi\u011fini ve di\u011fer politikalarla \u00e7ak\u0131\u015f\u0131p \u00e7ak\u0131\u015fmad\u0131\u011f\u0131n\u0131 do\u011frulamak i\u00e7in kritik \u00f6neme sahiptir.<\/p>\n<h4>Versiyonlama ve CI\/CD Entegrasyonu<\/h4>\n<p>Politikalar\u0131 kod olarak ele almak (Policy-as-Code), versiyon kontrol sistemlerinde y\u00f6netmek ve CI\/CD pipeline'lar\u0131na entegre etmek, \u00e7at\u0131\u015fmas\u0131z bir ortam s\u00fcrd\u00fcrmek i\u00e7in en iyi yakla\u015f\u0131md\u0131r.<\/p>\n<ul>\n<li><b>GitOps:<\/b> Politikalar\u0131 Git deposunda saklay\u0131n ve otomatik da\u011f\u0131t\u0131m i\u00e7in Argo CD veya Flux gibi ara\u00e7lar kullan\u0131n.<\/li>\n<li><b>Otomatik Testler:<\/b> CI\/CD pipeline'lar\u0131n\u0131zda Kyverno CLI testlerini \u00e7al\u0131\u015ft\u0131rarak her politika de\u011fi\u015fikli\u011finin veya yeni politikan\u0131n mevcut kurallarla uyumlu oldu\u011funu do\u011frulay\u0131n.<\/li>\n<li><b>G\u00f6zden Ge\u00e7irme S\u00fcre\u00e7leri:<\/b> Yeni veya de\u011fi\u015ftirilmi\u015f politikalar\u0131n ba\u015fkalar\u0131 taraf\u0131ndan g\u00f6zden ge\u00e7irilmesini sa\u011flayarak potansiyel \u00e7at\u0131\u015fmalar\u0131 veya g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 tespit edin.<\/li>\n<\/ul>\n<h3>Sonu\u00e7<\/h3>\n<p>Kyverno, Kubernetes ortamlar\u0131nda politika y\u00f6netimini basitle\u015ftiren g\u00fc\u00e7l\u00fc bir ara\u00e7t\u0131r. Ancak, b\u00fcy\u00fck ve karma\u015f\u0131k ortamlarda \u00e7at\u0131\u015fmas\u0131z politikalar tasarlamak, dikkatli bir planlama ve en iyi uygulamalar\u0131n benimsenmesini gerektirir. M\u00fclkiyet, kapsam ve determinizm prensiplerine odaklanarak, politikalar\u0131n\u0131z\u0131 net bir \u015fekilde tan\u0131mlayabilir, hedeflerini s\u0131n\u0131rlayabilir ve \u00f6ng\u00f6r\u00fclebilir sonu\u00e7lar elde edebilirsiniz. Kaynak se\u00e7icileri, etiketler, do\u011fru admission kontrol a\u015famas\u0131 kullan\u0131m\u0131 ve g\u00fc\u00e7l\u00fc test s\u00fcre\u00e7leri ile Kyverno politikalar\u0131n\u0131z\u0131n hem g\u00fcvenli hem de operasyonel olarak verimli olmas\u0131n\u0131 sa\u011flayabilirsiniz. Bu desenleri uygulayarak, Kubernetes ortam\u0131n\u0131zda daha az hata, daha h\u0131zl\u0131 geli\u015ftirme d\u00f6ng\u00fcleri ve daha y\u00fcksek bir g\u00fcvenlik duru\u015fu elde edeceksiniz.<\/p>\n<h3>SSS (S\u0131k Sorulan Sorular)<\/h3>\n<h4>Kyverno politikalar\u0131 neden \u00e7ak\u0131\u015f\u0131r?<\/h4>\n<p>Kyverno politikalar\u0131 genellikle ayn\u0131 kaynak \u00fczerinde farkl\u0131 de\u011ferler atamaya \u00e7al\u0131\u015fan mutate kurallar\u0131 veya bir kayna\u011fa izin verirken di\u011ferinin reddetti\u011fi validate kurallar\u0131 nedeniyle \u00e7ak\u0131\u015f\u0131r. Bu durum, politikalar\u0131n kapsam\u0131n\u0131n ve hedeflerinin yeterince ayr\u0131\u015ft\u0131r\u0131lmamas\u0131ndan kaynaklan\u0131r.<\/p>\n<h4>\u00c7ak\u0131\u015fmalar\u0131 \u00f6nlemek i\u00e7in en iyi ilk ad\u0131m nedir?<\/h4>\n<p>En iyi ilk ad\u0131m, politikalar\u0131n m\u00fclkiyetini ve kapsam\u0131n\u0131 net bir \u015fekilde tan\u0131mlamakt\u0131r. Hangi tak\u0131m\u0131n veya b\u00f6l\u00fcm\u00fcn hangi kaynaklar \u00fczerinde hangi t\u00fcr politikalar\u0131 uygulayabilece\u011fini belirlemek, gereksiz \u00e7ak\u0131\u015fmalar\u0131 ba\u015ftan engeller. Namespace bazl\u0131 veya etiket bazl\u0131 m\u00fclkiyet desenleri bu konuda \u00e7ok yard\u0131mc\u0131 olur.<\/p>\n<h4>Mevcut \u00e7ak\u0131\u015fmalar\u0131 nas\u0131l tespit edebilirim?<\/h4>\n<p>Mevcut \u00e7ak\u0131\u015fmalar\u0131 tespit etmek i\u00e7in Kyverno'nun <code>PolicyReport<\/code> ve <code>ClusterPolicyReport<\/code> kaynaklar\u0131n\u0131 d\u00fczenli olarak incelemelisiniz. Ayr\u0131ca, yeni politikalar\u0131 devreye almadan \u00f6nce <code>dry run<\/code> modunu kullanmak ve Kyverno CLI ile yerel testler yapmak, potansiyel sorunlar\u0131 \u00f6nceden g\u00f6rmenizi sa\u011flar.<\/p>\n<h4><code>match<\/code> ve <code>exclude<\/code> bloklar\u0131 nas\u0131l kullan\u0131l\u0131r?<\/h4>\n<p><code>match<\/code> bloklar\u0131, politikan\u0131n uygulanaca\u011f\u0131 kaynaklar\u0131 belirlerken, <code>exclude<\/code> bloklar\u0131 bu kaynaklar aras\u0131ndan belirli istisnalar\u0131 hari\u00e7 tutar. Bu bloklar\u0131 kullanarak politikalar\u0131n\u0131z\u0131n kapsam\u0131n\u0131 \u00e7ok hassas bir \u015fekilde tan\u0131mlayabilir, b\u00f6ylece sadece hedeflenen kaynaklar \u00fczerinde i\u015flem yapmalar\u0131n\u0131 sa\u011flayabilirsiniz.<\/p>\n<h4>Mutate ve Validate politikalar\u0131 aras\u0131ndaki fark nedir?<\/h4>\n<p>Mutate politikalar\u0131, bir kaynak Kubernetes API'ye g\u00f6nderilmeden veya g\u00fcncellenmeden \u00f6nce onu de\u011fi\u015ftirir (\u00f6rne\u011fin, eksik etiketleri ekler). Validate politikalar\u0131 ise kayna\u011f\u0131n belirli kurallara uygun olup olmad\u0131\u011f\u0131n\u0131 kontrol eder ve uyumsuz kaynaklar\u0131 reddeder. Mutate politikalar\u0131 \u00f6nce \u00e7al\u0131\u015f\u0131r, ard\u0131ndan validate politikalar\u0131 mutate edilmi\u015f kayna\u011f\u0131 de\u011ferlendirir.<\/p>\n","protected":false},"excerpt":{"rendered":"\u00c7at\u0131\u015fmas\u0131z Kyverno Politikalar\u0131 Tasar\u0131m\u0131: M\u00fclkiyet, Kapsam ve Determinizm \u0130\u00e7in Desenler\nKubernetes ortamlar\u0131nda g\u00fcvenlik, uyumluluk ve operasyon&#8230;","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":[1],"tags":[],"class_list":{"0":"post-38855","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-genel","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>\u00c7at\u0131\u015fmas\u0131z Kyverno Politikalar\u0131 Tasar\u0131m\u0131: M\u00fclkiyet, Kapsam ve Determinizm \u0130\u00e7in Desenler - 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