{"id":7726,"date":"2024-12-26T11:00:15","date_gmt":"2024-12-26T08:00:15","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/kuberneteste-statefulsetler-ile-durum-bilgisi-saklayan-uygulamalar-calistirma\/"},"modified":"2024-12-26T11:00:15","modified_gmt":"2024-12-26T08:00:15","slug":"kuberneteste-statefulsetler-ile-durum-bilgisi-saklayan-uygulamalar-calistirma","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/kuberneteste-statefulsetler-ile-durum-bilgisi-saklayan-uygulamalar-calistirma\/","title":{"rendered":"Kubernetes’te StatefulSet’ler ile Durum Bilgisi Saklayan Uygulamalar \u00c7al\u0131\u015ft\u0131rma"},"content":{"rendered":"

<\/p>\n

Kubernetes’te StatefulSet’ler ile Durum Bilgisi Saklayan Uygulamalar \u00c7al\u0131\u015ft\u0131rma<\/p>\n

Merhaba! Ben Fatih Soysal ve bu makalede, Kubernetes’te durum bilgisi saklayan uygulamalar\u0131n nas\u0131l \u00e7al\u0131\u015ft\u0131r\u0131laca\u011f\u0131n\u0131, \u00f6zellikle de StatefulSet’lerin kullan\u0131m\u0131n\u0131 detayl\u0131 bir \u015fekilde ele alaca\u011f\u0131z. Durum bilgisi saklayan uygulamalar, \u00f6rne\u011fin veritabanlar\u0131, dosya sunucular\u0131 veya cache sistemleri gibi, \u00e7al\u0131\u015fma s\u00fcreleri boyunca verilerini saklamalar\u0131 gereken uygulamalard\u0131r. Bu uygulamalar i\u00e7in standart Deployment’lar yeterli de\u011fildir \u00e7\u00fcnk\u00fc Pod’lar yeniden ba\u015flat\u0131ld\u0131\u011f\u0131nda verileri kaybolabilir.<\/p>\n

\u0130\u015fte tam bu noktada StatefulSet’ler devreye giriyor. StatefulSet’ler<\/strong>, Kubernetes’in durum bilgisi saklayan uygulamalar i\u00e7in \u00f6zel olarak tasarlanm\u0131\u015f bir kontrolc\u00fcs\u00fcd\u00fcr. Bu kontrolc\u00fc, Pod’lara benzersiz isimler atayarak, kal\u0131c\u0131 diskler sa\u011flayarak ve s\u0131ral\u0131 bir \u015fekilde \u00f6l\u00e7eklendirme yaparak uygulamalar\u0131n durum bilgilerini koruyabilmesini sa\u011flar.<\/p>\n

StatefulSet’lerin Avantajlar\u0131<\/h2>\n

StatefulSet’leri kullanman\u0131n bir\u00e7ok avantaj\u0131 vard\u0131r. \u00d6ncelikle, Pod’lara benzersiz kimlikler<\/strong> atar. Bu, her Pod’un kendi kal\u0131c\u0131 depolama alan\u0131na sahip olmas\u0131n\u0131 ve di\u011fer Pod’larla \u00e7ak\u0131\u015fma ya\u015fanmamas\u0131n\u0131 sa\u011flar. Ayr\u0131ca, Pod’lar s\u0131ral\u0131 bir \u015fekilde olu\u015fturulur ve silinir<\/strong>. Bu durum, uygulamalar\u0131n ba\u015flang\u0131\u00e7 s\u0131ras\u0131n\u0131n \u00f6nemli oldu\u011fu senaryolarda olduk\u00e7a yararl\u0131d\u0131r. Son olarak, kal\u0131c\u0131 disk deste\u011fi<\/strong> sayesinde Pod’lar yeniden ba\u015flat\u0131ld\u0131\u011f\u0131nda veya \u00f6l\u00e7eklendirildi\u011finde bile veriler korunur. <\/p>\n

StatefulSet Yap\u0131land\u0131rmas\u0131<\/h2>\n

Bir StatefulSet’i yap\u0131land\u0131rmak i\u00e7in bir YAML dosyas\u0131 kullan\u0131rs\u0131n\u0131z. Bu dosyada, Pod’lar\u0131n say\u0131s\u0131, kullan\u0131lan image, kal\u0131c\u0131 diskler ve di\u011fer konfig\u00fcrasyon detaylar\u0131 belirtilir. A\u015fa\u011f\u0131da basit bir \u00f6rnek verilmi\u015ftir:<\/p>\n

\napiVersion: apps\/v1\nkind: StatefulSet\nmetadata:\n  name: my-statefulset\nspec:\n  serviceName: my-service\n  replicas: 3\n  selector:\n    matchLabels:\n      app: my-app\n  template:\n    metadata:\n      labels:\n        app: my-app\n    spec:\n      containers:\n      - name: my-container\n        image: my-image\n        ports:\n        - containerPort: 8080\n  volumeClaimTemplates:\n  - metadata:\n      name: my-pvc\n    spec:\n      accessModes:\n        - ReadWriteOnce\n      resources:\n        requests:\n          storage: 1Gi\n<\/code><\/pre>\n
Bu \u00f6rnekte, 3 replikal\u0131 bir StatefulSet tan\u0131mlanm\u0131\u015ft\u0131r. Her Pod, 1GB’l\u0131k bir kal\u0131c\u0131 disk kullan\u0131r.  volumeClaimTemplates b\u00f6l\u00fcm\u00fc, kal\u0131c\u0131 diskleri nas\u0131l yap\u0131land\u0131raca\u011f\u0131n\u0131z\u0131 g\u00f6sterir. Daha fazla bilgi i\u00e7in Kubernetes d\u00f6k\u00fcmantasyonuna buradan<\/a> ula\u015fabilirsiniz.<\/p>\n
Kullan\u0131m Senaryolar\u0131<\/h2>\n
StatefulSet’ler, bir\u00e7ok farkl\u0131 durum bilgisi saklayan uygulama i\u00e7in kullan\u0131labilir.  Bunlardan baz\u0131lar\u0131 \u015funlard\u0131r:<\/p>\n