{"id":6295,"date":"2019-07-26T18:55:40","date_gmt":"2019-07-26T18:55:40","guid":{"rendered":"https:\/\/www.devopsschool.com\/blog\/?p=6295"},"modified":"2021-11-16T11:11:55","modified_gmt":"2021-11-16T11:11:55","slug":"working-with-kubernetes-cluster-using-kubectl-part-9-multi-containers-pods","status":"publish","type":"post","link":"https:\/\/www.devopsschool.com\/blog\/working-with-kubernetes-cluster-using-kubectl-part-9-multi-containers-pods\/","title":{"rendered":"Working with Kubernetes Cluster using Kubectl Part &#8211; 9 &#8211; Multi Containers Pods"},"content":{"rendered":"\n<p><strong>multicontainer-pod.yaml<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" 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>: Pod\n<span class=\"hljs-attr\">metadata<\/span>:\n  name: multicontainer-pod\n<span class=\"hljs-attr\">spec<\/span>:\n  containers:\n  - name: producer\n    <span class=\"hljs-attr\">image<\/span>: ubuntu\n    <span class=\"hljs-attr\">command<\/span>: &#91;<span class=\"hljs-string\">\"\/bin\/bash\"<\/span>]\n    <span class=\"hljs-attr\">args<\/span>: &#91;<span class=\"hljs-string\">\"-c\"<\/span>, <span class=\"hljs-string\">\"while true; do echo $(hostname) $(date) &gt;&gt; \/var\/log\/index.html; sleep 10; done\"<\/span>]\n    <span class=\"hljs-attr\">volumeMounts<\/span>:\n    - name: webcontent\n      <span class=\"hljs-attr\">mountPath<\/span>: <span class=\"hljs-regexp\">\/var\/<\/span>log\n  - name: consumer\n    <span class=\"hljs-attr\">image<\/span>: nginx\n    <span class=\"hljs-attr\">ports<\/span>:\n      - containerPort: <span class=\"hljs-number\">80<\/span>\n    <span class=\"hljs-attr\">volumeMounts<\/span>:\n    - name: webcontent\n      <span class=\"hljs-attr\">mountPath<\/span>: <span class=\"hljs-regexp\">\/usr\/<\/span>share\/nginx\/html\n  <span class=\"hljs-attr\">volumes<\/span>:\n  - name: webcontent \n    <span class=\"hljs-attr\">emptyDir<\/span>: {}\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><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<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">\n<span class=\"hljs-comment\">#Review the code for a multi-container pod, the volume webcontent is an emptyDir...essentially a temporary file system.<\/span>\n<span class=\"hljs-comment\">#This is mounted in the containers at mountPath, in two different locations inside the container.<\/span>\n<span class=\"hljs-comment\">#As producer writes data, consumer can see it immediatly since it's a shared file system.<\/span>\nmore multicontainer-pod.yaml\n\n<span class=\"hljs-comment\">#Let's create our multi-container Pod.<\/span>\nkubectl apply -f multicontainer-pod.yaml\n\n<span class=\"hljs-comment\">#Let's connect to our Pod...not specifying a name defaults to the first container in the configuration<\/span>\nkubectl exec -it multicontainer-pod -- \/bin\/sh\nls -la \/<span class=\"hljs-keyword\">var<\/span>\/log\ntail \/<span class=\"hljs-keyword\">var<\/span>\/log\/index.html\n<span class=\"hljs-keyword\">exit<\/span>\n\n<span class=\"hljs-comment\">#Let's specify a container name and access the consumer container in our Pod<\/span>\nkubectl exec -it multicontainer-pod --container consumer -- \/bin\/sh\nls -la \/usr\/share\/nginx\/html\ntail \/usr\/share\/nginx\/html\/index.html\n<span class=\"hljs-keyword\">exit<\/span>\n\n<span class=\"hljs-comment\">#This application listens on port 80, we'll forward from 8080-&gt;80<\/span>\nkubectl port-forward multicontainer-pod <span class=\"hljs-number\">8080<\/span>:<span class=\"hljs-number\">80<\/span> &amp;\ncurl http:<span class=\"hljs-comment\">\/\/localhost:8080<\/span>\n\n<span class=\"hljs-comment\">#Kill our port-forward.<\/span>\nfg\nctrl+c\n\nkubectl delete pod multicontainer-pod<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><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<div class=\"epyt-gallery\" data-currpage=\"1\" id=\"epyt_gallery_30014\"><iframe loading=\"lazy\"  id=\"_ytid_96896\"  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_30014\"  allow=\"fullscreen; accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen data-no-lazy=\"1\" data-skipgform_ajax_framebjll=\"\"><\/iframe><div class=\"epyt-gallery-list\"><div>Sorry, there was a YouTube error.<\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>multicontainer-pod.yaml<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[4859],"tags":[],"class_list":["post-6295","post","type-post","status-publish","format-standard","hentry","category-kubernetes"],"_links":{"self":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/6295","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/comments?post=6295"}],"version-history":[{"count":2,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/6295\/revisions"}],"predecessor-version":[{"id":25476,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/6295\/revisions\/25476"}],"wp:attachment":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/media?parent=6295"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/categories?post=6295"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/tags?post=6295"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}