Cloudformation userdata json

Are there any lessons learned from the pattern? At time of this comment no revisions have been made and it's been over a year since publication. In any-case this is a great example of clean infrastructure provisioning.

cloudformation userdata json

Thank you for your contribution. I see this error. But the cloudformation designer will convert it automatically if it is valid JSON.

cloudformation userdata json

Even the JSON linter needs it. It's not a full cloudformation script, only a partial snippet. You have to fit it into a bigger one. Skip to content. Instantly share code, notes, and snippets. Code Revisions 2 Stars 2. Embed What would you like to do? Embed Embed this gist in your website. Share Copy sharable link for this gist. Learn more about clone URLs.

Download ZIP. This comment has been minimized. Sign in to view. Copy link Quote reply. Looks awesome, very simple to port to Terraform as well. InternetFacingRouteTable and many other resources are missing. Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment.

You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window.Infrastructure as Code IaC is the process of managing, provisioning and configuring computing infrastructure using machine-processable definition files or templates. They permit system architects, engineers, and developers to leverage reusable and updatables templates to deploy and manage complete resource stacks.

As the stack is templated, detailed and versioned, using such tools results in efficient and fast deployment to serve modern DevOps methods such as continuous delivery. Automation of the delivery using these tools also eliminates risks of misconfigurations and together with automated testing protects production environments.

In this article we will delve deep into CloudFormation, discussing the formats and structure of templates using real-life examples. Discover more about how to obtain versatility with Infrastructure as Code here.

Take a look at its basic components:. All the parameters we want to be editable in our stack. We can use them to introduce passwords, name a particular resource, or decide the type of resources, as shown in these examples:. Deciding which IP address can access our resources [2]:. The example below shows the mapping of an advanced configuration. In addition, it will deploy an ElastiCache nodes across multiple availability zones:.

Conditions are generally used to match parameter values with resources or properties. For example, using the Parameters at [1], we can match the application branch to different Security Groups :.

These Conditions can also trigger choices in the Resources section. The Resources section contains all the AWS objects we want to include in our stack. Continuing from the preceding example, we can match a Security Group to the application branch assuming we want our staging instances available only to the CustomerIpAddress declared in the Parameters [2]:. The Output section collects the information that we may need or want to pass to other stacks.

This gives us smaller and more readable files, the ability to add comments, and support for multi-line strings. Managing CloudFormation templates has recently become easier: AWS has introduced a graphic tool with diagrams and a drag-and-drop interface for managing templates.

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Creating, viewing, and updating even a complete stack is fast and less prone to errors as we have a complete overview of all the resource correlations while editing the details. Templates can be edited using a canvas pane or using a simple text file, but pay attention, currently only JSON formatted templates are supported.Tagging can restrict the control that you have over your instances. In the code editor, on the Parameters tab, choose Template. See the following UserData section examples for Linux and Windows.

You must also attach an instance profile to your EC2 instances. In the Parameters section, enter the appropriate information based on the needs of your environment, including your instance type, EC2 key pair, and AMI.

In the Options section, enter the appropriate information for your stack, and then choose Next. Open the Amazon EC2 console. In the navigation pane, in the Elastic Block Store section, choose Volumes.

How can I tag a root volume from an instance created by AWS CloudFormation?

Last updated: Choose Create Stackand then choose Design template. JSON template:. You will be billed for the AWS resources used if you create a stack from this template. Ref InstanceType AvailabilityZone:!

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Ref InstanceProfile KeyName:! Ref InstanceRole. Linux example:. Choose the Create stack icon. For Stack nameenter a name for your stack. Choose Next. Choose Create.

Tag the root volume of the instance 1.Examples for this could be:. AWS gives you, as the provisioner of instances, the capability of injecting code into the launch process of an EC2 instance, no matter if you go straight to EC2 or use for example CloudFormation to deploy your infrastructure. UserData is code that is executed on instances upon instance launch. On Windows that code can come in two flavours, script and powershell. UserData is a block of code with a maximum size of 16kb, after it has been encoded to Base A very basic test showed me that around lines of PowerShell encoded into Base64 equal around 16kb.

UserData on Windows can call two different shells, well, the two that exist on Windows except for Bash, for now? Part of this CloudFormation template would be the UserData block as you can see below. This example json is used to configure the local proxy on an instance leveraging the script call.

When both script and powershell are used in a userdata block then the batch script always gets executed first, no matter in what order the blocks are put in the userdata field. My recommendation is to only use script or powershellnot both. The Ref calls are used to gather input parameters to the CloudFormation script.

If you are going straight to the aws cli to provision your instances then using the userdata script is just as easy. If yes, then New-EC2Instance has two parameters that will help you pass in your userdata into a new instance. If not, and you are on WMF5 or have PackageManagement installed on your machine, then run the following command to install it from the command line:.

Depending on what you need to do you need to be aware of the execution context of your userdata script. Here you will be able to see the resulting script and check if your parameters were passed into your userdata script correctly for example.

Just recently I was tasked to find a product that, amongst others, does the following things: check infrastructure code for compliance be multi cloud c Version 2 released later that Sadly, application deployments that require downtime of your environment are still a common practice, sometimes it is because people do not know better and s Interested in all things around cloud automation.

Leave a Comment. Cloud Governance - The Best Way 4 minutes read Just recently I was tasked to find a product that, amongst others, does the following things: check infrastructure code for compliance be multi cloud c Azure Front Door to Support Deployments 2 minutes read Sadly, application deployments that require downtime of your environment are still a common practice, sometimes it is because people do not know better and sToggle nav.

Scattered over various blog posts and pieces of documentation are various tricks that I've yet to see collected anywhere, but that make working with CloudFormation variously less an exercise in a Matrix-like comprehension of never-ending braces, and in some cases possible at all when you mix and match features.

cloudformation userdata json

This article documents a couple that have helped us out. A common use for this is to pass a small shell script in order to bootstrap a node into a configuration management system of some kind. According to the reference documentationthat property takes a String. UserData must be Base64 encoded, and that function also takes a string. There is a slightly ugly hack what in CloudFormation isn't?

This might be moot if you're generating your stack manifests programatically from some other more palatable DSL, but it also can't hurt for those times when you want to read and understand what is going on. For example:. By using a null string as the delimeter and ensuring we specify escape sequences for the line endings, we can present something that is approaching readable whilst still satisfying the syntactic requirements of CloudFormation. Again taking AWS::ECInstance as an example, the documentation states that when defining security groups, the property that you should populate and what that property should contain is dependent on whether you are using VPC or not.

Plain EC2 security groups should be passed in the SecurityGroups property as a "list of strings". VPC security groups should be passed using the SecurityGroupIds property, again a list of strings - but this time a list of IDs not names. Except the documentation states that this type, when passed to Ref as an argument, will return the GroupName. A more promising place you might think to look is the documentation for the Fn::GetAtt intrinsic function, given that you can pass it both the logical name of a resource obtainable via Reffor exampleand the name of an attribute you would like returned.

The kicker here is that the table at the time of writing in the documentation that lists the types that Fn::GetAtt can be used against and the attributes that are returned does not include security groups of any kind nor their IDs. Manually configuring a given AWS entity that you are not sure how to encode and describing it in this way can reveal a whole host of attributes not documented in the reference material. About Consultancy Development Contact Blog.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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CloudFormation templates often contain repeated stanzas, information which must be loaded from external sources, and other functionality that would be easier handled as code, instead of configuration. Consider when a userdata script needs to be added to a CloudFormation template. Traditionally, you would re-write the script by hand in a valid JSON format. Using the DSL, you can specify the file containing the script and generate the correct information at runtime.

Additionally, CloudFormation templates are just massive JSON documents, making general readability and reusability an issue. The DSL allows not only a cleaner format and comments! To use in a specific project, add gem 'cloudformation-ruby-dsl' to your Gemfile, and then run bundle. See Contributing. It can respond to the following subcommands which are listed if you run without parameters :.

Below are the various functions currently available in the DSL. See the example script for more usage information. The tool defaults to region us-east Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

Sign up. Ruby DSL for creating Cloudformation templates. Ruby Branch: master. Find file. Sign in Sign up. Go back.

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Motivation CloudFormation templates often contain repeated stanzas, information which must be loaded from external sources, and other functionality that would be easier handled as code, instead of configuration.

Installation Run gem install cloudformation-ruby-dsl to install system-wide. Releasing See Releasing. Contributing See Contributing. It can respond to the following subcommands which are listed if you run without parameters : expand : output the JSON template to the command line takes optional --nopretty to minimize the output diff : compare an existing stack with your template.

Produces following exit codes: 0 - no differences, nothing to update 1 - stack does not exist, template Validation error 2 - there are differences between an existing stack and your template validate : run validation against the stack definition create : create a new stack from the output takes optional --s3-bucket to upload the template to the specified S3 bucket prior to creating the stack update : update an existing stack from the output takes optional --s3-bucket to upload the template to the specified S3 bucket prior to creating the stack.

Produces following exit codes: 0 - update finished successfully 1 - no updates to perform, stack doesn't exist, unable to update immutable parameter or tag, AWS ServiceError exception cancel-update : cancel updating a stack delete : delete a stack with prompt describe : get output of an existing stack and output it takes optional --nopretty to minimize output describe-resource : given two arguments: stack-name and logical-resource-id, get output from a stack concerning the specific resource takes optional --nopretty to minimize output get-template : get entire template output of an existing stack Command line options similar to cloudformation commands, but parsed by the dsl.

DSL Statements Add the named object to the appropriate collection.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I created a AWS cloudformation, which creates a launch configuration and an autoscaling group.

AWS CloudFormation DEMO - Stack, Template, Parameters, Mapping, IAM Role, Stack Policy

In the user Data in the launch Config I have configured the file system mount target, and I installed the cloudwatch agent:. After running the template, the resources got created successfuly. So I connected to my instance that got created by the autoscaling group via SSH to see if the userData was properly run and set. Can any one tell me what is wrong in the user data that it didn't get executed?

Check to see whether anything is in the log file. If not, then something's wrong with passing the User Data script from the template. Why do you have the initial empty quotes in the Join? See my previous answer to the question, " Installing packages using apt-get in CloudFormation file " for more info.

Here is how I resolved the problem: I Update the cloud-init in the user data before calling the meta-data and instead of installing the cloudwatch agent in the metadata, I did in the userdata. Learn more. Asked 3 years, 2 months ago. Active 2 years ago. Viewed 4k times. Cloud-init v. Up Datasource DataSourceEc2.

Souad Souad 3, 6 6 gold badges 47 47 silver badges 97 97 bronze badges.

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Active Oldest Votes. John Rotenstein John Rotenstein k 9 9 gold badges silver badges bronze badges. Your UserData format looks correct. You'll need to do some testing to see why User Data isn't running. It looks like you're using ubuntu instead. Nice find!

7 Awesome CloudFormation Hacks

It appears that User Data is installed on Ubuntu cloud images, but not cfn-init. I enhanced the template because I realized I was forgetting some important commands. I tried wjordan solution, by keeping ubuntu image and adding the cfn-init installation; but still no good result. I'm still trying Sign up or log in Sign up using Google.

cloudformation userdata json

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