{"id":3113,"date":"2017-10-23T17:15:38","date_gmt":"2017-10-23T14:15:38","guid":{"rendered":"https:\/\/www.systemcodegeeks.com\/?p=3113"},"modified":"2017-10-23T11:18:00","modified_gmt":"2017-10-23T08:18:00","slug":"kubernetes-simple-example-pod-running","status":"publish","type":"post","link":"https:\/\/www.systemcodegeeks.com\/devops\/kubernetes-simple-example-pod-running\/","title":{"rendered":"Kubernetes: Simple example of pod running"},"content":{"rendered":"<p>I recently needed to create a Kubernetes pod that would \u2018just sit there\u2019 while I used <cite>kube cp<\/cite> to copy some files to a persistent volume to which it was bound.<\/p>\n<p>I started out with this naive pod spec:<\/p>\n<p><cite>pod_no_while.yaml<\/cite><\/p>\n<pre class=\"brush:php\">kind: Pod\r\napiVersion: v1\r\nmetadata:\r\n  name: marks-dummy-pod\r\nspec:\r\n  containers:\r\n    - name: marks-dummy-pod\r\n      image: ubuntu\r\n  restartPolicy: Never<\/pre>\n<p>Let\u2019s apply that template:<\/p>\n<pre class=\"brush:bash\">$ kubectl apply -f pod_no_while.yaml \r\npod \"marks-dummy-pod\" created<\/pre>\n<p>And let\u2019s check if we have any running pods:<\/p>\n<pre class=\"brush:bash\">$ kubectl get pods\r\nNo resources found, use --show-all to see completed objects.<\/pre>\n<p>We won\u2019t see anything here because unsurprisingly the pod has run to completion as there\u2019s nothing to keep it running! We can confirm that by running this command:<\/p>\n<pre class=\"brush:bash\">$ kubectl get pods --show-all\r\nNAME              READY     STATUS      RESTARTS   AGE\r\nmarks-dummy-pod   0\/1       Completed   0          1m<\/pre>\n<p>Now let\u2019s create a pod that has an infinite bash while loop:<\/p>\n<p><cite>pod.yaml<\/cite><\/p>\n<pre class=\"brush:php\">kind: Pod\r\napiVersion: v1\r\nmetadata:\r\n  name: marks-dummy-pod\r\nspec:\r\n  containers:\r\n    - name: marks-dummy-pod\r\n      image: ubuntu\r\n      command: [\"\/bin\/bash\", \"-ec\", \"while :; do echo '.'; sleep 5 ; done\"]\r\n  restartPolicy: Never<\/pre>\n<p>Let\u2019s apply that one instead:<\/p>\n<pre class=\"brush:bash\">$ kubectl apply -f pod.yaml \r\nThe Pod \"marks-dummy-pod\" is invalid: spec: Forbidden: pod updates may not change fields other than `spec.containers[*].image`, `spec.initContainers[*].image`, `spec.activeDeadlineSeconds` or `spec.tolerations` (only additions to existing tolerations)<\/pre>\n<p>Oops, we need to delete it first so let\u2019s do that:<\/p>\n<pre class=\"brush:bash\">$ kubectl delete pod marks-dummy-pod\r\npod \"marks-dummy-pod\" deleted<\/pre>\n<p>Attempt #2:<\/p>\n<pre class=\"brush:bash\">$ kubectl apply -f pod.yaml \r\npod \"marks-dummy-pod\" created<\/pre>\n<p>And let\u2019s checkup on our pod:<\/p>\n<pre class=\"brush:bash\">$ kubectl get pods\r\nNAME              READY     STATUS    RESTARTS   AGE\r\nmarks-dummy-pod   1\/1       Running   0          14s<\/pre>\n<p>Looks better already. Let\u2019s check the logs<\/p>\n<pre class=\"brush:bash\">$ kubectl logs marks-dummy-pod \r\n.\r\n.<\/pre>\n<p>Great! We can now <cite>kubectl cp<\/cite> to our heart\u2019s content and then delete the pod aftewards.<\/p>\n<div class=\"attribution\">\n<table>\n<tbody>\n<tr>\n<td>Published on System Code Geeks with permission by Mark Needham, partner at our <a href=\"http:\/\/www.systemcodegeeks.com\/join-us\/scg\/\" target=\"_blank\" rel=\"noopener\">SCG program<\/a>. See the original article here: <a href=\"http:\/\/www.markhneedham.com\/blog\/2017\/10\/21\/kubernetes-simple-example-pod-running\/\" target=\"_blank\" rel=\"noopener\">Kubernetes: Simple example of pod running<\/a><\/p>\n<p>Opinions expressed by System Code Geeks contributors are their own.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>I recently needed to create a Kubernetes pod that would \u2018just sit there\u2019 while I used kube cp to copy some files to a persistent volume to which it was bound. I started out with this naive pod spec: pod_no_while.yaml kind: Pod apiVersion: v1 metadata: name: marks-dummy-pod spec: containers: &#8211; name: marks-dummy-pod image: ubuntu restartPolicy: &hellip;<\/p>\n","protected":false},"author":29,"featured_media":188,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[39],"tags":[],"class_list":["post-3113","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-devops"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Kubernetes: Simple example of pod running - System Code Geeks - 2026<\/title>\n<meta name=\"description\" content=\"I recently needed to create a Kubernetes pod that would \u2018just sit there\u2019 while I used kube cp to copy some files to a persistent volume to which it was\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.systemcodegeeks.com\/devops\/kubernetes-simple-example-pod-running\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Kubernetes: Simple example of pod running - 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