{"id":7962,"date":"2019-12-06T09:49:23","date_gmt":"2019-12-06T09:49:23","guid":{"rendered":"https:\/\/www.devopsschool.com\/blog\/?p=7962"},"modified":"2021-11-15T09:44:50","modified_gmt":"2021-11-15T09:44:50","slug":"kubernetes-configmap-explained-using-example","status":"publish","type":"post","link":"https:\/\/www.devopsschool.com\/blog\/kubernetes-configmap-explained-using-example\/","title":{"rendered":"Kubernetes Configmap explained using example"},"content":{"rendered":"\n<p><strong>Content of reverseproxy.conf<\/strong><\/p>\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\">\n---------------------------\nserver {\n    listen       <span class=\"hljs-number\">80<\/span>;\n    server_name  localhost;\n\n    location \/ {\n        proxy_bind <span class=\"hljs-number\">127.0<\/span><span class=\"hljs-number\">.0<\/span><span class=\"hljs-number\">.1<\/span>;\n        proxy_pass http:<span class=\"hljs-comment\">\/\/127.0.0.1:3000;<\/span>\n    }\n\n    error_page   <span class=\"hljs-number\">500<\/span> <span class=\"hljs-number\">502<\/span> <span class=\"hljs-number\">503<\/span> <span class=\"hljs-number\">504<\/span>  \/<span class=\"hljs-number\">50<\/span>x.html;\n    location = \/<span class=\"hljs-number\">50<\/span>x.html {\n        root   \/usr\/share\/nginx\/html;\n    }\n}<\/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<p><strong>Commands to execute to create configmap<\/strong><\/p>\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\">\n---------------------------\nkubectl create configmap my-config --<span class=\"hljs-keyword\">from<\/span>-file=reverseproxy.conf\nkubectl <span class=\"hljs-keyword\">get<\/span> cm\nkubectl describe cm my-config<\/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<p><strong>Example pod using configmap<\/strong><\/p>\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\">\n---------------------------\napiVersion: v1\n<span class=\"hljs-attr\">kind<\/span>: Pod\n<span class=\"hljs-attr\">metadata<\/span>:\n  name: helloworld-nginx\n  <span class=\"hljs-attr\">labels<\/span>:\n    app: helloworld-nginx\n<span class=\"hljs-attr\">spec<\/span>:\n  containers:\n  - name: nginx\n    <span class=\"hljs-attr\">image<\/span>: nginx:<span class=\"hljs-number\">1.11<\/span>\n    <span class=\"hljs-attr\">ports<\/span>:\n    - containerPort: <span class=\"hljs-number\">80<\/span>\n    <span class=\"hljs-attr\">volumeMounts<\/span>:\n    - name: config-volume\n      <span class=\"hljs-attr\">mountPath<\/span>: <span class=\"hljs-regexp\">\/etc\/<\/span>nginx\/conf.d\n  - name: k8s-demo\n    <span class=\"hljs-attr\">image<\/span>: wardviaene\/k8s-demo\n    <span class=\"hljs-attr\">ports<\/span>:\n    - containerPort: <span class=\"hljs-number\">3000<\/span>\n  <span class=\"hljs-attr\">volumes<\/span>:\n    - name: config-volume\n      <span class=\"hljs-attr\">configMap<\/span>:\n        name: my-config\n        <span class=\"hljs-attr\">items<\/span>:\n        - key: reverseproxy.conf\n          <span class=\"hljs-attr\">path<\/span>: myconfo.conf<\/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<p><strong>Validating configmap inside a pod<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">---------------------------\nkubectl exec -it helloworld-nginx \/bin\/bash\ncd \/etc\/nginx\/conf.d<\/code><\/span><\/pre>\n\n<div class=\"epyt-gallery\" data-currpage=\"1\" id=\"epyt_gallery_38801\"><figure class=\"wp-block-embed wp-block-embed-youtube is-type-video is-provider-youtube epyt-figure\"><div class=\"wp-block-embed__wrapper\"><iframe loading=\"lazy\"  id=\"_ytid_86060\"  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_38801\"  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><\/figure><div class=\"epyt-gallery-list\"><div>Sorry, there was a YouTube error.<\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Content of reverseproxy.conf Commands to execute to create configmap Example pod using configmap Validating configmap inside a pod<\/p>\n","protected":false},"author":1,"featured_media":8134,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","_joinchat":[],"footnotes":""},"categories":[4859],"tags":[5600,5449,519,4860,213],"class_list":["post-7962","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-kubernetes","tag-configmap","tag-devopsschool","tag-example","tag-kubernetes","tag-tutorial"],"_links":{"self":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/7962","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=7962"}],"version-history":[{"count":3,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/7962\/revisions"}],"predecessor-version":[{"id":25294,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/7962\/revisions\/25294"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/media\/8134"}],"wp:attachment":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/media?parent=7962"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/categories?post=7962"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/tags?post=7962"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}