{"id":22631,"date":"2022-10-03T14:13:01","date_gmt":"2022-10-03T14:13:01","guid":{"rendered":"https:\/\/www.devopsschool.com\/blog\/?p=22631"},"modified":"2025-07-12T05:40:17","modified_gmt":"2025-07-12T05:40:17","slug":"how-to-create-a-image-using-dockerfile","status":"publish","type":"post","link":"https:\/\/www.devopsschool.com\/blog\/how-to-create-a-image-using-dockerfile\/","title":{"rendered":"Docker Tutorials: Image &#8211; Create a image using Dockerfile"},"content":{"rendered":"\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>We learnt docker so we can create better docker images using dockerfile?<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">What is dockerfile?<\/h2>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">- a file\n- contains instructions\n- for writing each layer\n- multiple layers == one image<\/code><\/span><\/pre>\n\n\n<h2 class=\"wp-block-heading\">Rule of dockerfile?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>each line ==== one layer<\/li>\n\n\n\n<li>Each layer would be created from a container from the previous layer<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Example of Dockerfile<\/h2>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\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\">FROM ubuntu\nMAINTAINER Rajesh Kumar &lt;rajesh@devopsschool.com?\nRUN apt-<span class=\"hljs-keyword\">get<\/span> update\nRUN apt-<span class=\"hljs-keyword\">get<\/span> install git -y\nCOPY index.html \/opt<\/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\n<hr class=\"wp-block-separator has-css-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\">FROM ubuntu\nMAINTAINER Rajesh Kumar &lt;rajesh@devopsschool.com?\nRUN apt-<span class=\"hljs-keyword\">get<\/span> update\nRUN apt-<span class=\"hljs-keyword\">get<\/span> install git -y\nCOPY index.html \/opt<\/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-css-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\">FROM httpd\nMAINTAINER Rajesh Kumar &lt;rajesh@devopsschool.com?\nRUN apt-<span class=\"hljs-keyword\">get<\/span> update\nRUN apt-<span class=\"hljs-keyword\">get<\/span> install git -y\nCOPY index.html \/opt<\/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-css-opacity\"\/>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">   15  mkdir dock-image\n   16  cd dock-image\/\n   17  clear\n   18  vi dockerfile\n   19  touch index.html\n   20  docker build -t ub-up-git .\n   21  docker images\n<\/code><\/span><\/pre>\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Lab &amp; Excercise<\/h2>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">- https:<span class=\"hljs-comment\">\/\/devopsschool.com\/tutorial\/docker\/dockerfile\/dockerfile-example-sample-lab.html<\/span>\n\nExample of App Dockerfile\n<span class=\"hljs-comment\"># https:\/\/github.com\/jenkinsci\/docker\/blob\/587b2856cd225bb152c4abeeaaa24934c75aa460\/Dockerfile<\/span>\n<span class=\"hljs-comment\"># https:\/\/github.com\/tianon\/docker-brew-ubuntu-core\/blob\/50b110c15148c069706b155a60d21ecfcbb59de9\/focal\/Dockerfile<\/span>\n<span class=\"hljs-comment\"># https:\/\/github.com\/docker-library\/httpd\/blob\/6d68525ac47c0474d3d74269b2669104c1d867dd\/2.4\/Dockerfile<\/span>\n\nHow to set PID1 <span class=\"hljs-keyword\">for<\/span> the image?\n- CMD <span class=\"hljs-keyword\">or<\/span> ENTRYPOINT\n\nReference \n- https:<span class=\"hljs-comment\">\/\/devopsschool.com\/tutorial\/docker\/commands\/index.html<\/span>\n- $ docker help\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><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<h2 class=\"wp-block-heading\">Reference<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.devopsschool.com\/blog\/example-and-sample-programs-of-dockerfile\/\">https:\/\/www.devopsschool.com\/blog\/example-and-sample-programs-of-dockerfile\/<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.devopsschool.com\/blog\/understanding-dockerfiles-instructions-options-of-docker\/\">https:\/\/www.devopsschool.com\/blog\/understanding-dockerfiles-instructions-options-of-docker\/<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.devopsschool.com\/blog\/dockerfile-lab-exercise-1\/\">https:\/\/www.devopsschool.com\/blog\/dockerfile-lab-exercise-1\/<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.devopsschool.com\/blog\/how-to-create-a-image-using-dockerfile\/\">https:\/\/www.devopsschool.com\/blog\/how-to-create-a-image-using-dockerfile\/<\/a><\/li>\n<\/ul>\n\n\n\n<div class=\"epyt-gallery\" data-currpage=\"1\" id=\"epyt_gallery_31791\"><iframe loading=\"lazy\"  id=\"_ytid_70300\"  width=\"760\" height=\"427\"  data-origwidth=\"760\" data-origheight=\"427\" src=\"https:\/\/www.youtube.com\/embed\/?enablejsapi=1&autoplay=0&cc_load_policy=0&cc_lang_pref=&iv_load_policy=1&loop=0&rel=1&fs=1&playsinline=0&autohide=2&theme=dark&color=red&controls=1&disablekb=0&\" class=\"__youtube_prefs__  no-lazyload\" title=\"YouTube player\"  data-epytgalleryid=\"epyt_gallery_31791\"  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>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>We learnt docker so we can create better docker images using dockerfile? What is dockerfile? Rule of dockerfile? Example of Dockerfile Lab &amp; Excercise Reference<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[4862],"tags":[],"class_list":["post-22631","post","type-post","status-publish","format-standard","hentry","category-docker"],"_links":{"self":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/22631","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=22631"}],"version-history":[{"count":5,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/22631\/revisions"}],"predecessor-version":[{"id":50118,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/22631\/revisions\/50118"}],"wp:attachment":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/media?parent=22631"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/categories?post=22631"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/tags?post=22631"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}