Newbie: Installing applications on aws instance using terraform.

[Venson Joy]

Hi Guys,

Ive just started working on terraform so please correct me if i am wrong. I want to know if there is any way to install applications on aws instance using terraform, if its even possible.

Example: i want to host a web application (Node.js) in public instance accessing database (myql) in private instance and would like to know if this could be sone via terraform.

Thanks in advance guys,

Venson

[Andrew Langhorn]

Hi!

In this example, you can sort your VPCs, subnets, DHCP option sets etc., ASGs, routes and all that through Terraform, but Terraform's not used to add configuration to an instance; for that, you'll either be wanting to bake an AMI using, say, Packer first, and passing the AMI ID to Terraform, or having the instance pull a configuration on boot using cloudinit/userdata and run it -- something like Puppet or Chef would work for that.

Andrew

[Venson Joy]

Thank you so much for your prompt response andrew. This information is very useful for me.

Thanks,
Venson

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[Andrew Langhorn]

:)

[Ionut Cadariu]

Hi Venson,

I've been using   something like this, and do all the needed configurations:

user_data                   = "${file("${path.module}/instance-provision.sh")}" # in case you are using modules

user_data                   = "${file("instance-provision.sh")}"              # without using modules

Hope it helps. 

Ionut

[Lowe Schmidt]

Hey,

I would advise against it, but you can use the Terraform provisioners to make some things you're asking for. See https://www.terraform.io/docs/provisioners/index.html

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Lowe Schmidt | +46 723 867 157

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[Venson Joy]

Thanks Inout,

So the user data part must be done in aws instance in advance rite? Or is there a place in terraform where i can write the installation scrip for individual instance?

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[ja...@fpcomplete.com]

I would recommend a) using packer to do pre-launch heavy lifting (install everything you want to use, configure what you can), and b) init provisioning to configure/run services you want running at launch. Launching the instance should be fast and simple. Before launching, the AMI should have all the apps/services you want to use, you should only need to configure/run during that init with Terraform. Regardless of what size operation, I highly recommend CM tooling to assist with a) and b).

[Poluvex Tripplex]

One way of doing it however you end up heavy on AMI management - that is for complex apps you will end up with a lot of AMIs - even more if you need to manage code/config lifecycle and maintain different versions of your stack/configs.

Alternative, just bake a minimum image and use Ansible or Puppet to configure and build your app stack on top,

This way you only need single AMI and gain ability to reconfigure your apps on the fly.