{"id":12958,"date":"2023-04-05T05:18:09","date_gmt":"2023-04-05T05:18:09","guid":{"rendered":"https:\/\/www.devopsschool.com\/blog\/?p=12958"},"modified":"2023-04-05T06:16:05","modified_gmt":"2023-04-05T06:16:05","slug":"templating-in-terraform-using-template_file-with-sample-program","status":"publish","type":"post","link":"https:\/\/www.devopsschool.com\/blog\/templating-in-terraform-using-template_file-with-sample-program\/","title":{"rendered":"Terraform Tutorials: Templating in Terraform"},"content":{"rendered":"\n<p>In Terraform, the template process refers to the process of using a template engine to dynamically generate configuration files or values based on a set of input parameters.<\/p>\n\n\n\n<p>Terraform supports various template engines, including Go&#8217;s <code>text\/template<\/code> and <code>html\/template<\/code>, as well as the Jinja2 template engine. These template engines enable you to write dynamic templates with placeholders for values that will be replaced by actual values at runtime.<\/p>\n\n\n\n<p>The template process in Terraform involves the following steps:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Define a template file: Create a template file with placeholders for the values that will be replaced at runtime.<\/li>\n\n\n\n<li>Define variables: Define input variables that will be used to replace the placeholders in the template file.<\/li>\n\n\n\n<li>Use the template engine: Use the <code>templatefile()<\/code> function or <code>template_file<\/code> data source to render the template and generate the final output.<\/li>\n\n\n\n<li>Use the output: Use the generated output in your Terraform configuration, such as passing it to a resource as a value.<\/li>\n<\/ol>\n\n\n\n<p>The template process is useful for generating dynamic configuration files, such as cloud-init scripts, Kubernetes manifests, and shell scripts, among others. It enables you to generate configuration files based on the specific needs of your environment, without having to hard-code the values in your Terraform configuration.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"880\" height=\"693\" src=\"https:\/\/www.devopsschool.com\/blog\/wp-content\/uploads\/2023\/04\/image-49.png\" alt=\"\" class=\"wp-image-33270\" srcset=\"https:\/\/www.devopsschool.com\/blog\/wp-content\/uploads\/2023\/04\/image-49.png 880w, https:\/\/www.devopsschool.com\/blog\/wp-content\/uploads\/2023\/04\/image-49-300x236.png 300w, https:\/\/www.devopsschool.com\/blog\/wp-content\/uploads\/2023\/04\/image-49-768x605.png 768w\" sizes=\"auto, (max-width: 880px) 100vw, 880px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Example &#8211; 1<\/h2>\n\n\n\n<script src=\"https:\/\/gist.github.com\/devops-school\/8b2a6720c116417637c963a3111af865.js\"><\/script>\n\n\n\n<h2 class=\"wp-block-heading\">Example 2<\/h2>\n\n\n\n<script src=\"https:\/\/gist.github.com\/devops-school\/7d5b9948bb3b857fd94fa028393ff961.js\"><\/script>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\"><\/code><\/span><\/pre>\n\n\n<h2 class=\"wp-block-heading\">List 10 real use case where i can use Template template_file of Terrraform<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Cloud-init Configuration:<\/strong> You can use Terraform&#8217;s <code>template_file<\/code> data source to create cloud-init configuration files for your virtual machines or instances.<\/li>\n\n\n\n<li><strong>Nginx Configuration: <\/strong>With <code>template_file<\/code>, you can create an Nginx configuration file to customize the web server based on your specific needs.<\/li>\n\n\n\n<li><strong>DNS Records: <\/strong>Use <code>template_file<\/code> to create custom DNS records and add them to your DNS server configuration files.<\/li>\n\n\n\n<li><strong>Configuration Files for Services:<\/strong> <code>template_file<\/code> can be used to generate configuration files for various services such as Apache, MySQL, Postgres, etc.<\/li>\n\n\n\n<li><strong>SSL\/TLS Certificates<\/strong>: You can use <code>template_file<\/code> to generate SSL\/TLS certificate configuration files for various web servers.<\/li>\n\n\n\n<li><strong>Bash Scripts:<\/strong> Use <code>template_file<\/code> to generate bash scripts to automate repetitive tasks such as backing up files or deploying code.<\/li>\n\n\n\n<li><strong>User Data for EC2 Instances:<\/strong> With <code>template_file<\/code>, you can create EC2 instance user data scripts to configure your instances when they launch.<\/li>\n\n\n\n<li><strong>Load Balancer Configuration:<\/strong> You can use <code>template_file<\/code> to create load balancer configuration files for services like AWS Elastic Load Balancer (ELB) or NGINX.<\/li>\n\n\n\n<li><strong>Kubernetes Manifests:<\/strong> <code>template_file<\/code> can be used to create Kubernetes manifest files for deploying applications to a Kubernetes cluster.<\/li>\n\n\n\n<li><strong>Database Configuration Files: <\/strong>Use <code>template_file<\/code> to generate database configuration files for various databases like MongoDB, Redis, Cassandra, etc.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<div class=\"epyt-gallery\" data-currpage=\"1\" id=\"epyt_gallery_31690\"><iframe loading=\"lazy\"  id=\"_ytid_30626\"  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_31690\"  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>In Terraform, the template process refers to the process of using a template engine to dynamically generate configuration files or values based on a set of input parameters. Terraform supports&#8230; <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[5129],"tags":[],"class_list":["post-12958","post","type-post","status-publish","format-standard","hentry","category-terraform"],"_links":{"self":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/12958","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=12958"}],"version-history":[{"count":8,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/12958\/revisions"}],"predecessor-version":[{"id":33274,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/12958\/revisions\/33274"}],"wp:attachment":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/media?parent=12958"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/categories?post=12958"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/tags?post=12958"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}