{"id":20605,"date":"2021-03-24T10:25:59","date_gmt":"2021-03-24T10:25:59","guid":{"rendered":"http:\/\/www.devopsschool.com\/blog\/?p=20605"},"modified":"2025-01-23T12:45:31","modified_gmt":"2025-01-23T12:45:31","slug":"explained-kubernetes-kubernetes-statefulset-with-example","status":"publish","type":"post","link":"https:\/\/www.devopsschool.com\/blog\/explained-kubernetes-kubernetes-statefulset-with-example\/","title":{"rendered":"Kubernetes Tutorials: Statefulset with example"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Statefulset example with HostPath PV<\/h2>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">apiVersion: apps\/v1\r\nkind: StatefulSet\r\nmetadata:\r\n  name: web\r\nspec:\r\n  serviceName: <span class=\"hljs-string\">\"web-service\"<\/span>\r\n  replicas: <span class=\"hljs-number\">2<\/span>\r\n  selector:\r\n    matchLabels:\r\n      app: web\r\n  template:\r\n    metadata:\r\n      labels:\r\n        app: web\r\n    spec:\r\n      containers:\r\n      - name: web-container\r\n        image: nginx:latest\r\n        ports:\r\n        - containerPort: <span class=\"hljs-number\">80<\/span>\r\n        volumeMounts:\r\n        - name: data\r\n          mountPath: \/<span class=\"hljs-keyword\">var<\/span>\/www\/html  <span class=\"hljs-comment\"># Mount the volume at this path inside the container<\/span>\r\n  volumeClaimTemplates:\r\n  - metadata:\r\n      name: data\r\n    spec:\r\n      accessModes: &#91; <span class=\"hljs-string\">\"ReadWriteOnce\"<\/span> ]\r\n      resources:\r\n        requests:\r\n          storage: <span class=\"hljs-number\">1<\/span>Gi\r\n      storageClassName: manual <\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Statefulsets\u2026<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>pod name<\/li>\n\n\n\n<li>order<\/li>\n\n\n\n<li>sticky to pvc<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Statefulset example with NFS PV<\/h2>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">apiVersion: v1\n<span class=\"hljs-attr\">kind<\/span>: PersistentVolume\n<span class=\"hljs-attr\">metadata<\/span>:\n  name: pv0001 \n<span class=\"hljs-attr\">spec<\/span>:\n  capacity:\n    storage: <span class=\"hljs-number\">1<\/span>Gi \n  <span class=\"hljs-attr\">accessModes<\/span>:\n  - ReadWriteOnce \n  <span class=\"hljs-attr\">nfs<\/span>: \n    path: <span class=\"hljs-regexp\">\/tecnotree\/<\/span>pv0001\n    <span class=\"hljs-attr\">server<\/span>: <span class=\"hljs-number\">172.31<\/span><span class=\"hljs-number\">.14<\/span><span class=\"hljs-number\">.69<\/span> \n  <span class=\"hljs-attr\">persistentVolumeReclaimPolicy<\/span>: Recycle<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">apiVersion: v1\n<span class=\"hljs-attr\">kind<\/span>: PersistentVolume\n<span class=\"hljs-attr\">metadata<\/span>:\n  name: pv0002\n<span class=\"hljs-attr\">spec<\/span>:\n  capacity:\n    storage: <span class=\"hljs-number\">1<\/span>Gi \n  <span class=\"hljs-attr\">accessModes<\/span>:\n  - ReadWriteOnce \n  <span class=\"hljs-attr\">nfs<\/span>: \n    path: <span class=\"hljs-regexp\">\/tecnotree\/<\/span>pv0002\n    <span class=\"hljs-attr\">server<\/span>: <span class=\"hljs-number\">172.31<\/span><span class=\"hljs-number\">.14<\/span><span class=\"hljs-number\">.69<\/span> \n  <span class=\"hljs-attr\">persistentVolumeReclaimPolicy<\/span>: Recycle<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">apiVersion: apps\/v1\n<span class=\"hljs-attr\">kind<\/span>: StatefulSet\n<span class=\"hljs-attr\">metadata<\/span>:\n  name: web\n<span class=\"hljs-attr\">spec<\/span>:\n  serviceName: <span class=\"hljs-string\">\"nginx\"<\/span>\n  <span class=\"hljs-attr\">replicas<\/span>: <span class=\"hljs-number\">2<\/span>\n  <span class=\"hljs-attr\">selector<\/span>:\n    matchLabels:\n      app: nginx\n  <span class=\"hljs-attr\">template<\/span>:\n    metadata:\n      labels:\n        app: nginx\n    <span class=\"hljs-attr\">spec<\/span>:\n      containers:\n      - name: nginx\n        <span class=\"hljs-attr\">image<\/span>: k8s.gcr.io\/nginx-slim:<span class=\"hljs-number\">0.8<\/span>\n        <span class=\"hljs-attr\">ports<\/span>:\n        - containerPort: <span class=\"hljs-number\">80<\/span>\n          <span class=\"hljs-attr\">name<\/span>: web\n        <span class=\"hljs-attr\">volumeMounts<\/span>:\n        - name: www\n          <span class=\"hljs-attr\">mountPath<\/span>: <span class=\"hljs-regexp\">\/usr\/<\/span>share\/nginx\/html\n  <span class=\"hljs-attr\">volumeClaimTemplates<\/span>:\n  - metadata:\n      name: www\n    <span class=\"hljs-attr\">spec<\/span>:\n      accessModes: &#91; <span class=\"hljs-string\">\"ReadWriteOnce\"<\/span> ]\n      <span class=\"hljs-attr\">resources<\/span>:\n        requests:\n          storage: <span class=\"hljs-number\">1<\/span>Gi<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">apiVersion: v1\nkind: Service\nmetadata:\n  name: nginx\n  labels:\n    app: nginx\nspec:\n  ports:\n  - port: 80\n    name: web\n  clusterIP: None\n  selector:\n    app: nginx<\/code><\/span><\/pre>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<div class=\"epyt-gallery\" data-currpage=\"1\" id=\"epyt_gallery_50794\"><iframe loading=\"lazy\"  id=\"_ytid_71303\"  width=\"760\" height=\"427\"  data-origwidth=\"760\" data-origheight=\"427\" src=\"https:\/\/www.youtube.com\/embed\/?enablejsapi=1&#038;autoplay=0&#038;cc_load_policy=0&#038;cc_lang_pref=&#038;iv_load_policy=1&#038;loop=0&#038;rel=1&#038;fs=1&#038;playsinline=0&#038;autohide=2&#038;theme=dark&#038;color=red&#038;controls=1&#038;disablekb=0&#038;\" class=\"__youtube_prefs__  no-lazyload\" title=\"YouTube player\"  data-epytgalleryid=\"epyt_gallery_50794\"  allow=\"fullscreen; 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