How To Structure Terraform Project (3 Levels)
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- Опубліковано 2 сер 2024
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#Terraform #Kubernetes #DevOps - Наука та технологія
🔴 - To support my channel, I’d like to offer Mentorship/On-the-Job Support/Consulting - me@antonputra.com
👉 Terraform Tutorials for Beginners: ua-cam.com/play/PLiMWaCMwGJXmJdmfJjG3aK1IkU7oWvxIj.html
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Anton, you and Cloud Champs youtube channels are seriously holding it down for the DevOps learning community. Im constantly bouncing between the channels because the content is practical and great.
thanks❤️
Dude you're putting serious quality content with these videos. Liking before seeing and already saving this on my watchlist ...
THANKS
thank you! :)
What a awesome lesson! I was looking for that info 1 month ago because changed my job place and needed to create terraform repo from a scratch. Very useful
thanks!
Thank you so much for making such a thorough yet simplified video about this, I'm new to TF and have been experimenting with so many different ideas. I've been running into a lot of the issues you covered, consistently, this is such a great help.
Welcome! Those are not the only approaches you can take, but they are the most common.
I found that Terragrunt method which you uploaded here is the best for me. I hope you extend about Terragrunt more. Thanks Anton
Welcome! Yeah, Dependency is way better, but there is a lot going on around OpenTofu (a fork of Terraform to work with Terragrunt), so I would suggest learning about it before committing to Terragrunt.
Thank you for this kind of video. There are thousands of Terraform videos in youtube but it is hard to find one that show how to use it professionally.
thank you!!!
Amazing video Anton! I saw a lot of companies trying to scale with V2 version and is impossible! Other common mistake is use one repository for the entire IaC, with the same life cycle for a VPC and a simple resource(S3 for audit team, DynamoDB for specific API...)
Thanks. I find the most difficult part is building Terraform/Ansible modules for managing distributed systems such as Kafka and Cassandra. Usually, Terraform/Packer is not enough...
I was waiting for that video!
here you go :)
Thank you so much for this video! It's a great reference.
❤️
Thank you so much for this incredible vidéo. I'm going to watch to Terragrunt to get more deeper on the subjet. Much appreciate
thank you!
Thanks, awesome content.
thank you!!
Having one root module per environment (e.g. dev, stg, prd) makes sense to me, as you definitely want those to be different terraform states and be able to run in parallel, but I simply can't wrap my head around why you'd want to have a root module for each service as well (e.g. envs/dev/subnet, envs/dev/vpc as opposed to a single envs/dev that has all services).
I know Google suggests a similar thing for their terraform guide, as it helps keep the state file and thus blast radius small and makes terraform plan run fast.
However, you no longer manage dependencies between services in terraform and have to move to bash scripts with specific order in them. As a developer you then need to be extremely mindful in which order you've applied things as it's no longer as simple as running one single `plan` or `apply`.
The number of root modules also rises significantly, and becomes a product of `envs` and `services` - which can lead to a large amount of boilerplate code one has to manage.
It seems that the reason you'd want a state file per envⓧservice pair is due to terraform's limitations - if it could impute which part needs to be re-planned / fetched, it wouldn't really matter how big your state file is. Kinda how git & web state management frameworks can be pretty efficient and spot diffs accurately.
Any advice on this would be appreciated, still learning how to do this best.
Usually, you never let anyone apply locally, therefore, they don't need to worry about dependencies as everything is done via PR and applied on some remote CI server (e.g., Jenkins, GitHub Actions). You can also use Terragrunt and explicitly define dependencies. The main reason for splitting the state is to make it more efficient and quicker to refresh when you run a plan. You can use the -target flag, but it is not convenient. Splitting the state should only be done for very large projects. When you have multiple large kafka clusters with hunderds of nodes deployed on ec2 instance, cassandra clusters etc. Every time terraform would need to refresh every single ec2.
@@AntonPutra I tend to apply locally when developing infra code using infra-dev environments. It gives me a way to quickly iterate and provides a good signal of correctness - there's nothing worse than approved PRs failing at terraform apply stage or just not producing the desired effect because your code is wrong and you never tested it. I use terraform variables to specify the project/environment (dev.tfvars & cd.tfvars) and terraform config to specify backend buckets (dev.conf & cd.conf). Adds a bit of boilerplate but helps in the end.
Thanks for Terragrunt, I'll definitely look into it. Might be more than what we need, but I can see how it solves this specific problem.
terraform workspace :)
Hi Anton,
Great video as always! I went through a similar evolutionary process to what you described. I started with a very basic setup, and as the infrastructure grew, the problems you mentioned arose. Eventually, I ended up with a structure like yours, except I set up a private Terraform registry to manage the modules more efficiently and conveniently. I use Terrareg, which I believe is the ultimate option.
I have a few questions:
1. Do you think it's correct to manage the providers as a separate module instead of creating a file for each project?
2. You mentioned that some resources can be put in the global folder. What do you think should go there?
Thanks!
Thanks!
1. Well, I like the Terragrunt approach. You define it in the root, and it gets generated in every single environment. I don't suggest using Terragrunt, but you should definitely take a look at the "best" practices they have implemented.
2. IAM users, global S3 buckets to share artifacts like jars, ECR repos, etc. Some, including me, like to manage their own centralized monitoring and logging in a single place. It is much cheaper than Datadog, SignalFx, etc.
Thank you, consider a blog with some of the slides or ReadMe to the same git repo...just a thought...thx
thanks, i'll think about it
can you do please a deep full course on ecs like you did on eks with terraform and all the concepts that would help a lot because you have a way of teaching so great ! cuz sometimes you don't need eks for simple projects , ecs would satisfy the need ! thnks in advance
Thanks, I'll see what I can do. Are there a lot of people still using ECS? let's see :) - www.linkedin.com/feed/update/urn:li:activity:7217542062328422404/
It would be very cool to learn more about terragrunt =)
yeap, just be carefull with licences :) - ua-cam.com/video/yduHaOj3XMg/v-deo.html
Nice video. What about using git submodules? i think you can create git repo and store all modules there and then add this repo as git submodule to your project. After that you can simple reference module in submodule folder. Also you can switch between branches in this submodule so you can test changes or deploy different configurations
Yes, you can, but not many people get used to working with Git submodules, lol. But it's a 100% legitimate option!
Thank you for the awesome video! What do you think about terraform workspaces? Any pluses/minuses to using them instead of splitting the environments into folders?
I cover it in one of the tutorials in that playlist. The biggest issue is authorization, you won't be able to grant different users access to different environments. By using folders and saving states in different buckets or simply using prefixes, you can limit access accordingly. I'll refresh that topic soon.
Interesting, as far as I'm aware if you run terraform apply when using workspaces, terraform will automatically assign the statefile to "env:/$TF_WORKSPACE" prefix in that S3 bucket. So if there is a way to grant granular access to different iam roles for each prefix, it could be done. Once again thank you for the awesome content you push so regularly!
Hi , thank you very much for this great effort , does it mean vpc-02 folder will replace the /modules/vpc ? coz you mentioned that will act like versioning
Welcome, no it’s stays until it’s referenced in at least 1 environment
I am looking forward some lessons
👌
Nice Video, Thanks! One question when i store my module in a private repo and i run my terraform deployment in a cicd pipeline like github action, how would you configure the github action to be able to pull the module repo? Whats the best approach here?
Well, you generally have 2 options (GitHub):
1. Create a PAT token. The maximum expiration, I think, is 1 year. Then use git clone [TOKEN]@github.com/[REPO-OWNER]/[REPO-NAME].
2. Create a 'deploy key' at the repository level and use it to authenticate. I prefer this option because it does not have an expiration.
@@AntonPutra thanks!
Better use terraform workspace and stop managing directory structure :)
With workspaces, you can't limit access to specific environments as you can with S3 buckets and paths.
@@AntonPutra But I don't need to have all those directories and every workspace has one state file created automatically :)
Why are you creating different environments instead of having the logic in the terraform files and let runtime variables from files and environment variables (secrets). This reduces the complexity significantly instead of having to maintain so many different directories and files.
Also, don't read outputs from state file, use a data source directly to your provider. That is how hashicorp suggest, and for good reason. It will query your endpoint for a resource that is live rather than your state, which could be corrupted, or the resource could've been changed outside of Terraform.
Thanks for the feedback. Well, it's one of the options.
I use terraform workspace to avoid to directory per env :)
@@emmanuelgelatimesa2712 it works in small teams
yeah, that's three ways to do it but... terraform "state" is ephemeral and therefore "state" should be relative!
Can you elaborate? The state file should be set to the name of the component. For example, Terragrunt automatically generates the state path based on the folder structure.
example - github.com/antonputra/tutorials/blob/main/lessons/160/git-infrastructure-live/terragrunt.hcl#L13
@@AntonPutra - I'm not poo hoo'ing your video but years of experience in large deployments (GovCloud) has proved that trying to maintain a single source of "truth" for terraform "state" is all but impossible and that managing terraform "state" relative to the context you are working in is enough. Not to mention that in large deployments (GovCloud) that are managed hierarchically, decisions made at levels above your pay grade, such as policy changes, can and will trickle down so that the terraform "state" becomes "stale" or more appropriately becomes invalid. At this point, remediation by way of "terraform import" becomes the task of the day. Once again, not poo hoo'ing your excellent work or this video but Hashicorp's recommended process and layout has never scaled or even worked for the large deployments (GovCloud) I have been involved in.
Bro, this is too much just to create an image. Just because we can doesn't mean we should.
image?? what do you mean?
Everything before 4:35 is a bad practice and shouldn't be even mentioned as "evolution". Beginners should learn how to write reusable, composable, and fully parameterized code (with full separation of code and data) from the start. Hence splitting your code by "environments"/regions etc. is also a bad idea.
Common fallacies, again...
The more 'reusable' you make your code, the harder it is to use to maintain large projects.😊 There are always trade-offs...
For some reason, nobody wants to think about Day 2 operations and everyone only wants one-click deployments. Managers love it.
@@AntonPutra "The more 'reusable' you make your code, the harder it is to use to maintain large projects." :-[]
It's, actually, the opposite. And If it becomes hard to maintain large projects with existing code, that is, it can't scale well, it means that the initial approach/design was bad (and, generally speaking, it has nothing to do with "one-click deployments", or day 2 operations).
@@maxbashyrov5785 Would you please describe your approach or provide a link to an article? I'll make another video covering it.