{"id":2961,"date":"2019-08-30T09:53:40","date_gmt":"2019-08-30T09:53:40","guid":{"rendered":"https:\/\/www.testpreptraining.com\/tutorial\/?page_id=2961"},"modified":"2020-05-01T11:00:00","modified_gmt":"2020-05-01T11:00:00","slug":"cloudformation","status":"publish","type":"page","link":"https:\/\/www.testpreptraining.ai\/tutorial\/aws-certified-developer-associate\/cloudformation\/","title":{"rendered":"Learning about CloudFormation"},"content":{"rendered":"\n<ul class=\"wp-block-list\"><li>It is a AWS service<\/li><li>It simplifies Infrastructure Management<\/li><li>Used to model and set up AWS resources<\/li><li>Involves creating&nbsp; template which lists AWS resources needed<\/li><li>responsible for provisioning and configuring AWS resources<\/li><li>Used by Elastic Beanstalk<\/li><li>Cloud formation (CFN) template describes all needed resources and their properties.<\/li><li>Template\n<ul>\n<li>has JSON format<\/li>\n<\/ul>\n<ul>\n<li>JSON document gives instructions for CFN<\/li>\n<\/ul>\n<ul>\n<li>Instructions on resources to act and what resources to create\/update<\/li>\n<\/ul>\n<\/li><li>Stack&nbsp;\n<ul>\n<li>refers to CFN unit of grouping infra<\/li>\n<\/ul>\n<\/li><li>Stack Policy\n<ul>\n<li>IAM style policy<\/li>\n<\/ul>\n<ul>\n<li>governs what or who can change<\/li>\n<\/ul>\n<ul>\n<li>can be added via CLI or UI<\/li>\n<\/ul>\n<ul>\n<li>updated but cannot be removed<\/li>\n<\/ul>\n<\/li><li>Create CFN template -&gt; Add template to CFN -&gt; Create CFNStack -&gt; Resources (200 per template) -&gt; Update template\/Stack -&gt; Delete Stack<\/li><li>Template components\n<ul>\n<li>Parameters&nbsp; &#8211; used to pass variables into template<\/li>\n<\/ul>\n<ul>\n<li>Mappings (allow processing of hash&#8217;s by CFN template)<\/li>\n<\/ul>\n<ul>\n<li>Resources,<\/li>\n<\/ul>\n<ul>\n<li>Outputs (results from template);<\/li>\n<\/ul>\n<ul>\n<li>&nbsp;Only Resources is mandatory.<\/li>\n<\/ul>\n<ul>\n<li>CFN can run scripts within instances, expand files within instances, stack id(unique).<\/li>\n<\/ul>\n<\/li><li>Use cases:\n<ul>\n<li>Template for manual deployment of bespoke infra.<\/li>\n<\/ul>\n<ul>\n<li>create repeatable patterned environment (ex:wordpress site with DB)<\/li>\n<\/ul>\n<ul>\n<li>run automated testing for CI\/CD environments (dev, test, prod)<\/li>\n<\/ul>\n<ul>\n<li>define an environment once, deployed<\/li>\n<\/ul>\n<ul>\n<li>manage infra config using software development style versioning and testing concepts.<\/li>\n<\/ul>\n<\/li><li>It provisions\n<ul>\n<li>Auto Scaling group<\/li>\n<\/ul>\n<ul>\n<li>load balancer<\/li>\n<\/ul>\n<ul>\n<li>and database<\/li>\n<\/ul>\n<\/li><li>Can easily edit or delete resources &nbsp;<\/li><li>manage a collection of resources as a single unit or stack.<\/li><li>Quickly replicate infrastructure<\/li><li>control and track changes to infrastructure<\/li><\/ul>\n\n\n\n<p><strong>CloudFormation Working<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Easily create an infrastructure stack, with CloudFormation by\n<ul>\n<li>making underlying service calls to AWS<\/li>\n<\/ul>\n<ul>\n<li>provision and configure AWS resources.<\/li>\n<\/ul>\n<\/li><li>calls are as per defined template.<\/li><li>CloudFormation perform only actions having permission to do.<\/li><li>CloudFormation template can be a JSON or YAML-formatted document<\/li><li>After all resources have been created, AWS CloudFormation reports stack creation<\/li><li>If stack creation fails, CloudFormation rolls back changes by deleting the resources that it created.<\/li><\/ul>\n\n\n\n<p><strong>Steps<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Design an CloudFormation template in AWS CloudFormation Designer or text editor.<\/li><li>Save template either in s3 or locally<\/li><li>Create an AWS CloudFormation stack by specifying the location of template file<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"549\" height=\"245\" src=\"https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2019\/09\/image-239.png\" alt=\"\" class=\"wp-image-3939\"\/><\/figure>\n\n\n\n<p><strong>Change Sets<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>It is a summary of proposed changes to stack<\/li><li>Used for stack updation<\/li><li>stack updation is done to reflect changes on resources being used<\/li><li>Before making changes, generate a change set<\/li><li>Change sets enables seeing impact of change on running resources, before implementing them.<\/li><li>Updates can cause interruptions, depending on resource and properties being updated<\/li><li>Change sets do not indicate successful stack update.<\/li><li>Example, changing Amazon RDS database instance name,\n<ul>\n<li>CloudFormation will create a new database and delete the old one and and will lose data in old database<\/li>\n<\/ul>\n<ul>\n<li>With change set, see changes on database to be replaced, and plan accordingly<\/li>\n<\/ul>\n<\/li><\/ul>\n\n\n\n<p>Updating a Stack with Change Sets<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>To update stack&#8217;s resources, modify stack&#8217;s template.<\/li><li>Do not create new stack and delete old one.<\/li><li>Instead, create change set by submitting a modified version of original stack template,<\/li><li>CloudFormation compares the modified with original template and generates a change set.<\/li><li>Change set lists the proposed changes.<\/li><li>After reviewing changes, execute the change set to update stack<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"624\" height=\"158\" src=\"https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2019\/09\/image-240.png\" alt=\"\" class=\"wp-image-3940\"\/><\/figure>\n\n\n\n<p><strong>Steps<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\r\n<li>Modify CloudFormation stack template using CloudFormation Designer or a text editor.<\/li>\r\n<li>Save CFN template can be saved either to s3 bucket or locally<\/li>\r\n<li>changeset is created to reflect any changes needed in stack<\/li>\r\n<li>View changeset to check CloudFormation will perform with the changes<\/li>\r\n<li>Execute changeset to apply to stack.<\/li>\r\n<\/ul>\r\n<p><strong>Enrich and Enhance your skills to become an <a href=\"https:\/\/www.testpreptraining.ai\/aws-certified-developer-associate-practice-exam\">AWS Certified Developer &#8211; Associate<\/a> with hundreds of Free Practice Test. Try Now!<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>It is a AWS service It simplifies Infrastructure Management Used to model and set up AWS resources Involves creating&nbsp; template which lists AWS resources needed responsible for provisioning and configuring AWS resources Used by Elastic Beanstalk Cloud formation (CFN) template describes all needed resources and their properties. Template has JSON format JSON document gives instructions&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":2476,"menu_order":44,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"categories":[2],"tags":[7,351],"class_list":["post-2961","page","type-page","status-publish","hentry","category-amazon-aws","tag-aws","tag-cloudformation"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Learning about CloudFormation - Testprep Training Tutorials<\/title>\n<meta name=\"description\" content=\"Qualify as an AWS Certified Developer - Associate with hundreds of real time practice exam. 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