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Just copy subnet IDs for any two of the subnets that will appear and you're in business. And subnets? Well more of the same, obviously. Need a VPC ID? Keeping in mind that VPCs are EC2 objects, you can run aws ec2 describe-vpcs and all the data you'll need - including the VPC ID - will magically appear. How will that work? It's the AWS CLI to the rescue. Specifically, we'll need references to a VPC and to two subnets - and because this is a multi-availability-zone deployment, they'll need to be in different zones. That's because, as you'll no doubt remember from looking through the template, there are some extra parameters that need satisfying. The problem is that, if you were to run that command against the template in your JSON document, it would fail. ParameterKey=KeyName,ParameterValue=mykey
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This minimal example shows you how to point CloudFormation to your JSON template file, a name to assign to your stack, and a valid SSH key so I'll be able to log into the instance it creates. The command, however, takes a few arguments to pass important information. You use the CLI to fire up a Cloudformation stack using the create-stack command. To get things going, you can simply click to view the template ( which you can see here), and copy the contents, pasting it into a new JSON file on your local machine. We'll have to figure out a way to add those values. It's critical that all the right services know those details because, otherwise, they won't be able to talk to each other. There you'll see Parameters sections defining the VPC and subnets into which your instance will launch and the MySQL database name, user, and password. You can click View from that AWS documentation page and take a look at the template itself. The Application Frameworks template set includes a template for auto scaled Linux servers that will come pre-provisioned with the Apache web server and the PHP scripting language, and a connection to a Multi-AZ RDS database instance running the MySQL database engine. To show you what I mean, let's experiment with a more complex stack using a template that comes from the AWS documentation samples. But how you're expected to get that information through the CLI might, at first, not appear so obvious. If you do choose to go with the AWS CLI – something I highly recommend – you'll need a way to gather key information about other account resources.
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You may also know that you can mange your CloudFormation stacks both through the AWS Management Console and, as I discuss in my new Pluralsight course, Create and Manage Stacks with AWS CloudFormation Using the Command Line Interface, using the AWS CLI. The CloudFormation templates that define those stacks can be shared, edited, and launched anywhere, giving you predictable and reliable cloud application environments wherever and whenever you need them. You may already know that Amazon's CloudFormation service exists to let you manage your application infrastructure by organising it into stacks of your AWS account resources. With that, we'll all set to get down to work in the next clip. Just to confirm it all worked, I'll list all the S3 buckets in my account. The format won't be an issue so I'll leave it as default. If you like you can then choose a default AWS region and output format.
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With your credentials in hand, you can run "aws configure." You'll be prompted to enter your access key ID and the secret key itself. You access the security credentials page from the drop-down account menu at the top of any page on the console. I'm sure you understand the problem with that. Now, the CLI has a "create-access-key" command that'll generate a new key, but that's only possible once I've authenticated. You see, to authenticate the CLI to your account you'll need a valid access key. The next step will require one quick trip to the management console. I'll run aws -version to confirm everything worked as it was supposed to. That'll create a new directory called aws that'll contain a install script, which I can run using sudo to get admin privileges.
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To get it done, I'll paste the curl command from the Amazon page into my Linux shell that'll download the package and write it to a local zip file, which I'll then unzip.
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I'm working with Linux so that's where I'd head next. Right now they're pushing us towards version 2 of the CLI and I haven't seen any reason not to go along. The best way to get it done is to head over to the AWS installation guide and follow instructions for your OS. Installing the AWS CLI is actually quite simple. How to get exactly the account and environment information you need to manage your AWS account using just the AWS CLI