{"id":61946,"date":"2021-06-08T18:13:53","date_gmt":"2021-06-08T15:13:53","guid":{"rendered":"https:\/\/www.altoros.com\/blog\/?p=61946"},"modified":"2021-06-15T13:15:30","modified_gmt":"2021-06-15T10:15:30","slug":"cloud-native-buildpacks-how-to-create-a-custom-builder","status":"publish","type":"post","link":"https:\/\/www.altoros.com\/blog\/cloud-native-buildpacks-how-to-create-a-custom-builder\/","title":{"rendered":"Cloud Native Buildpacks: How to Design a Custom Builder"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_79_2 counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.altoros.com\/blog\/cloud-native-buildpacks-how-to-create-a-custom-builder\/#The_builder\" >The builder<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.altoros.com\/blog\/cloud-native-buildpacks-how-to-create-a-custom-builder\/#The_buildertoml_file\" >The builder.toml file<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.altoros.com\/blog\/cloud-native-buildpacks-how-to-create-a-custom-builder\/#Building_the_image\" >Building the image<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.altoros.com\/blog\/cloud-native-buildpacks-how-to-create-a-custom-builder\/#Putting_it_all_together\" >Putting it all together<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.altoros.com\/blog\/cloud-native-buildpacks-how-to-create-a-custom-builder\/#More_in_this_series\" >More in this series<\/a><\/li><\/ul><\/nav><\/div>\n<h3><span class=\"ez-toc-section\" id=\"The_builder\"><\/span>The builder<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>After creating a <a href=\"https:\/\/www.altoros.com\/blog\/cloud-native-buildpacks-creating-custom-components\/\">stack<\/a> and a <a href=\"https:\/\/www.altoros.com\/blog\/cloud-native-buildpacks-how-to-create-a-custom-buildpack\/\">buildpack<\/a>, we are ready to add the third and final Cloud Native Buildpacks component, the <b>builder<\/b>, to our example <a href=\"https:\/\/github.com\/Altoros\/cn-buildpacks-example\">repository<\/a>. The builder specifies which stack and buildpacks are available for use during the building of app images. This abstraction greatly simplifies the CNB build process.<\/p>\n<p><center><a href=\"https:\/\/www.altoros.com\/blog\/wp-content\/uploads\/2021\/06\/builder-placement-in-CNB-process.png\"><img decoding=\"async\" src=\"https:\/\/www.altoros.com\/blog\/wp-content\/uploads\/2021\/06\/builder-placement-in-CNB-process-1024x576.png\" alt=\"\" width=\"640\" class=\"aligncenter size-large wp-image-61952\" \/><\/a><small>The builder\u2019s place in the CNB process<\/small><\/center><\/p>\n<p>The builder encapsulates multiple buildpacks, which means it can support different tech stacks. A single stack ensures consistency in the built app images. This means producing an app image only requires two inputs, an app and a builder.<\/p>\n<p><center><a href=\"https:\/\/www.altoros.com\/blog\/wp-content\/uploads\/2021\/06\/CNB-builder-structure-and-usage.png\"><img decoding=\"async\" src=\"https:\/\/www.altoros.com\/blog\/wp-content\/uploads\/2021\/06\/CNB-builder-structure-and-usage-1024x576.png\" alt=\"\" width=\"640\" class=\"aligncenter size-large wp-image-61953\" \/><\/a><small>The structure and use of the CNB builder<\/small><\/center><\/p>\n<p>The builder itself is quite simple, only a single configuration file. Unlike the stack and buildpack, the builder\u2019s work is organizational rather than functional, so there is not much code necessary. The important decisions here are which buildpacks and what stack will package applications.<\/p>\n<p>This simplicity is reflected in the repository\u2019s files. Only <code style=\"color: black; background-color: #e6e6e6;\">builder.toml<\/code>, a <a href=\"https:\/\/toml.io\/en\/\" rel=\"noopener noreferrer\" target=\"_blank\">TOML markup file<\/a>, is needed.<\/p>\n<p><center><a href=\"https:\/\/www.altoros.com\/blog\/wp-content\/uploads\/2021\/06\/Builder-related-files.png\"><img decoding=\"async\" src=\"https:\/\/www.altoros.com\/blog\/wp-content\/uploads\/2021\/06\/Builder-related-files.png\" alt=\"\" width=\"500\" class=\"aligncenter size-full wp-image-61951\" \/><\/a><small>Builder-related files in the example repository<\/small><\/center><\/p>\n<p>&nbsp;<\/p>\n<h3><span class=\"ez-toc-section\" id=\"The_buildertoml_file\"><\/span>The <code style=\"color: black; background-color: #e6e6e6;\">builder.toml<\/code> file<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Just as with the buildpack, TOML files are used to declare the CNB framework configuration information. Unlike the buildpack configuration, the complete <a href=\"https:\/\/buildpacks.io\/docs\/reference\/config\/builder-config\/\" rel=\"noopener noreferrer\" target=\"_blank\">set of options<\/a> for <code style=\"color: black; background-color: #e6e6e6;\">builder.toml<\/code> is fairly small. For example, rather than arbitrary metadata, it only allows a single optional line:<\/p>\n<pre class=\"brush: plain; title: ; notranslate\" title=\"\">description = &quot;Altoros example CNB builder&quot;\r\n<\/pre>\n<p>This is a brief description of the builder, and <code style=\"color: black; background-color: #e6e6e6;\">pack builder inspect &lt;builder image&gt;<\/code> will show the text. The main job of the builder is managing available buildpacks. Availability is declared as shown below.<\/p>\n<pre class=\"brush: plain; title: ; notranslate\" title=\"\">&#x5B;&#x5B;buildpacks]]\r\nid = &quot;altoros\/gradle&quot;\r\nversion = &quot;0.0.1&quot;\r\nuri = &quot;docker:\/\/altoros\/buildpack:gradle&quot;\r\n<\/pre>\n<p>The URI is the only required field and can point to a number of different file representations of a buildpack, including to the configuration source files. However, the best practice is to use a Docker image. Keeping every operations deliverable the same type means only a single process of storing and auditing, so things remain simple.<\/p>\n<p>Multiple buildpacks can be specified with additional <code style=\"color: black; background-color: #e6e6e6;\">[[buildpacks]]<\/code> blocks containing the same information. This list of buildpacks is not strictly required and does not need to be in any particular order. It is used, for example, to specify the URIs of different versions of the same buildpack. The order the buildpacks apply in is explicitly laid out in its own, required, section:<\/p>\n<pre class=\"brush: plain; title: ; notranslate\" title=\"\">&#x5B;&#x5B;order]]\r\n&#x5B;&#x5B;order.group]]\r\nid = &quot;altoros\/gradle&quot;\r\nversion = &quot;0.0.1&quot;\r\n<\/pre>\n<p>This <a href=\"https:\/\/toml.io\/en\/v1.0.0#array-of-tables\" rel=\"noopener noreferrer\" target=\"_blank\">TOML structure<\/a> is equivalent to the JSON below.<\/p>\n<pre class=\"brush: plain; title: ; notranslate\" title=\"\">{ &quot;order&quot;: &#x5B; \r\n  { &quot;order.group&quot;: &#x5B; \r\n    { &quot;id&quot;: &quot;altoros\/gradle&quot;, &quot;version&quot;: &quot;0.0.1&quot; } \r\n  ] }\r\n] }\r\n<\/pre>\n<p>Every buildpack in the builder has its own <code style=\"color: black; background-color: #e6e6e6;\">[[order.group]]<\/code> block. A new <code style=\"color: black; background-color: #e6e6e6;\">[[order]]<\/code> declaration indicates a new buildpack group. Groups are used to collect relevant or related buildpacks into a single working set. In the order written here, the framework runs the detect script for each buildpack in the group. The first group with all of its required buildpacks passing the detect phase is the group used to build the image. Buildpacks using different tech stacks (e.g., Java and Python) should be in separate groups, and, thus, separate <code style=\"color: black; background-color: #e6e6e6;\">[[order]]<\/code> sections.<\/p>\n<p>The other job of the builder is specifying a stack:<\/p>\n<pre class=\"brush: plain; title: ; notranslate\" title=\"\">&#x5B;stack]\r\nid = &quot;com.altoros.demo.cnb.stacks.ubuntu&quot;\r\nbuild-image = &quot;altoros\/build-image:ubuntu&quot;\r\nrun-image = &quot;altoros\/run-image:ubuntu&quot;\r\n<\/pre>\n<p>This required section specifies which stack is used, and what that stack\u2019s build and run images are. With this, our builder is complete.<\/p>\n<p>&nbsp;<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Building_the_image\"><\/span>Building the image<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Just as with the stack and buildpack, we\u2019ll package the builder component into a Docker image. Similarly, the pack command is straightforward. From the <code style=\"color: black; background-color: #e6e6e6;\">cnb-components\/builders<\/code> directory in the example:<\/p>\n<pre style=\"padding-left: 20px;\">pack builder create altoros\/builder:ubuntu --config .\/builder.toml\r\n<\/pre>\n<p>This creates the Docker image <code style=\"color: black; background-color: #e6e6e6;\">altoros\/builder:ubuntu<\/code> as a CNB builder. This command can be found in the <code style=\"color: black; background-color: #e6e6e6;\">create-images.sh<\/code> script. Once the image is created, we can view its information with <code style=\"color: black; background-color: #e6e6e6;\">pack builder inspect altoros\/builder:ubuntu<\/code> which will show the included buildpacks, their order and grouping, the chosen stack, and some framework metadata, including the description we wrote. Though the stack and buildpack images are necessary to create the builder, the packaged builder image has all of the data embedded in it, so producing an app image will only pull and use the builder image.<\/p>\n<p>&nbsp;<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Putting_it_all_together\"><\/span>Putting it all together<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>With a completed builder, we can now use it to build an app image for the example Spring Boot API. From the root of the repository, run <code style=\"color: black; background-color: #e6e6e6;\">pack build altoros\/cn-buildpacks-example --builder altoros\/builder:ubuntu<\/code> to produce the final app image. Start the image with <code style=\"color: black; background-color: #e6e6e6;\">docker run -d -p 8080:8080 altorosdev\/cn-buildpacks-example<\/code>, then <code style=\"color: black; background-color: #e6e6e6;\">GET http:\/\/localhost:8080\/<\/code>. You should receive <code style=\"color: black; background-color: #e6e6e6;\">Greetings from Spring Boot!<\/code> as the response.<\/p>\n<p>All of the CNB components can be published as Docker images to the <a href=\"https:\/\/registry.buildpacks.io\/\" rel=\"noopener noreferrer\" target=\"_blank\">CNB component registry<\/a> to share with the community. Producing components as images makes them easy to consume, audit, manage, and maintain internally, as well.<\/p>\n<p>Making your own Cloud Native Buildpacks framework components offers a great deal of flexibility and control over the Docker images used to deploy apps to production. The use of scaffolding to streamline the image building process can save organizations a great deal of time and complexity. Leveraging community-provided components means teams can try out the CNB process in an Agile manner, with minimal investment and risk. All in all, Cloud Native Buildpacks is an excellent addition to the software life cycle toolbox.<\/p>\n<p>&nbsp;<\/p>\n<h3><span class=\"ez-toc-section\" id=\"More_in_this_series\"><\/span>More in this series<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><a href=\"https:\/\/www.altoros.com\/blog\/cloud-native-buildpacks-how-to-create-a-custom-buildpack\/\">Cloud Native Buildpacks: How to Create a Custom Buildpack<\/a><\/li>\n<li><a href=\"https:\/\/www.altoros.com\/blog\/streamlining-the-creation-of-docker-images-with-cloud-native-buildpacks\/\">Cloud Native Buildpacks: Streamlining the Creation of Docker Images<\/a><\/li>\n<li><a href=\"https:\/\/www.altoros.com\/blog\/cloud-native-buildpacks-creating-custom-components\/\">Cloud Native Buildpacks: Creating a Stack for Custom Components<\/a><\/li>\n<\/ul>\n<hr \/>\n<p><center><small>This blog post was written by <a href=\"https:\/\/www.altoros.com\/blog\/author\/m-beaverson\/\">Michael Beaverson<\/a>,<br \/>\nedited by <a href=\"https:\/\/www.altoros.com\/blog\/author\/carlo\/\">Carlo Gutierrez<\/a>, <a href=\"https:\/\/www.altoros.com\/blog\/author\/sophie.turol\/\">Sophia Turol<\/a>, and <a href=\"https:\/\/www.altoros.com\/blog\/author\/alex\/\">Alex Khizhniak<\/a>.<\/small><\/center><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The builder<\/p>\n<p>After creating a stack and a buildpack, we are ready to add the third and final Cloud Native Buildpacks component, the builder, to our example repository. The builder specifies which stack and buildpacks are available for use during the building of app images. This abstraction greatly simplifies the CNB [&#8230;]<\/p>\n","protected":false},"author":194,"featured_media":61950,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":"","_links_to":"","_links_to_target":""},"categories":[214],"tags":[873,912],"class_list":["post-61946","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tutorials","tag-cloud-native","tag-kubernetes"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Cloud Native Buildpacks: How to Design a Custom Builder | Altoros<\/title>\n<meta name=\"description\" content=\"With code samples, this tutorial demonstrates how to create and consume a CNB builder, including the builder.toml file and usage commands.\" \/>\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.altoros.com\/blog\/cloud-native-buildpacks-how-to-create-a-custom-builder\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cloud Native Buildpacks: How to Design a Custom Builder | Altoros\" \/>\n<meta property=\"og:description\" content=\"The builder After creating a stack and a buildpack, we are ready to add the third and final Cloud Native Buildpacks component, the builder, to our example repository. 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