UKHSA Data Dashboard Infrastructure

This repo contains the infrastructure to bootstrap our AWS accounts and deploy an instance of the UKHSA Data Dashboard app.

The tooling and scripts in this repo are tested with Linux and Mac. If you're using Windows these may work with WSL2 🤞.

Prerequisites

There are a few steps needed before you can get started:

1. Setup an SSH key for GitHub
2. Clone this repo
3. Install tools
4. Configure AWS SSO
5. Login to the GitHub CLI
6. Enable multi-platform Docker builds

Setup an SSH key for GitHub

Please follow the instructions here to setup an SSH key for GitHub.

Clone this repo

Open a terminal and run the following commands:

git clone git@github.com:UKHSA-Internal/data-dashboard-infra.git
cd data-dashboard-infra

Install tools

We use homebrew to manage our software dependencies. If you don't already have it installed:

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

Then run the following commands to install the software dependencies:

brew install awscli
brew install --cask docker
brew install gh
brew install jq
brew install python@3.11
brew install tfenv

Configure AWS SSO

You need to sign into AWS and configure your profiles. You can either do this via the AWS CLI or by editing your config files directly. For UKHSA engineers we recommend editing your config files directly.

Using the AWS CLI

Sign into AWS and configure your profiles:

aws configure sso

Follow the prompts and configure the accounts / roles with the following profile names. When prompted for the region, enter eu-west-2.

Account	Role	Profile Name
Development	Developer	uhd-dev
Tooling	Developer	uhd-tools

Post config steps

Due to a bug in the AWS Terraform provider (hashicorp/terraform-provider-aws#28263), the following manual post config steps are needed:

1. Open your .aws/config file
2. Remove the sso_session parameter from the profile
3. Add the sso_start_url and sso_region to the profile

Example:

[profile foo]
sso_region = eu-west-2
sso_start_url = https://bar.awsapps.com/start
sso_account_id = 999999999
sso_role_name = Baz
region = eu-west-2

You will also need to add the assumed-role profiles the CLI is expecting for both the dev and tools accounts:

[profile foo/assumed-role]
role_arn = arn:aws:iam::foo:role/Developer
source_profile = foo
region = eu-west-2

Updating the config files directly

The ~/.aws/config should be updated with the profile names we use. Please follow the instructions in Confluence.

Login to the GitHub CLI

We use the GitHub CLI to check out pull request branches. To enable this feature you must login to the GitHub CLI:

gh auth login

Enable multi-platform Docker builds

We use docker buildx to enable us to produce arm64 images from x86_64 platforms. You'll need to enable it if you haven't already:

docker buildx create --use

Getting started

Source our CLI tool:

source uhd.sh

Assume the Developer role in our tools and dev accounts:

uhd aws login

And then test that you can query whoami

uhd aws whoami

Terraform

We use Terraform to manage the resources we deploy to AWS.

The Terraform code is split into two layers:

1. For account level resources. We deploy one each of these resources in each AWS account.
2. For application resources. This is the infrastructure to run an instance of the application. We deploy multiple instances of these resources into each AWS account.

Initialize

Terraform must be initialized on a new machine. To initialize for all layers:

uhd terraform init

Or to initialize a specific layer:

uhd terraform init <layer>

For example:

uhd terraform init 10-account

Plan

To run terraform plan for the application layer in your dev environment:

uhd terraform plan

Or to plan for a specific layer and environment:

uhd terraform plan:layer <layer> <env>

For example:

uhd terraform plan:layer 20-app foo

Apply

To run terraform apply for the application layer in your dev environment:

uhd terraform apply

Or to apply for a specific layer and environment:

uhd terraform apply:layer <layer> <env>

For example:

uhd terraform apply:layer 20-app foo

Push containers to your ECR

Until we finalize our strategy for ECR, you'll need to pull the latest container images and push them to your ECR:

uhd docker update <account> <env>

For example:

uhd docker update dev 12345678

Note that when pushing to the ECR in the next account, you will be logged into the ECR for that account automatically as part of the uhd docker update <account> <env> step.

Otherwise, should you wish to log in to the ECR within a specific account which is not the tools account:

uhd docker ecr:login <account>

For example:

uhd docker ecr:login dev

Bootstrap your environment

Once your infrastructure is deployed, you'll need to bootstrap your environment. This will set the API key, CMS admin user password, and seed your database with content and metrics.

These commands must be run from the dev account

Open a new terminal window and login to AWS:

source uhd.sh
uhd aws login uhd-dev

Run the bootstrap job:

uhd ecs run bootstrap-env

Make a note of the task ID. It is the last part of the task ARN. In the example below it is e3a5dc3fc35546c6980fabe45bc59fe6

arn:aws:ecs:eu-west-2:123456789012:task/uhd-12345678-cluster/e3a5dc3fc35546c6980fabe45bc59fe6

You can then tail the logs from the task. It may take a minute or two for the task to start:

uhd ecs logs <env> <task id>

For example:

uhd ecs logs 12345678 d20ee493b97143f293ae6ebb5f7b7c0a

Restart your services

Your environment should now be setup. The final step is to restart your services:

uhd ecs restart-services

Update your dev environment

The update command can be used to run all the previous steps together to simplify updating your environment. This command requires you to be logged in to both the tools and dev accounts at the same time. This can be done with the following command:

uhd aws login

Now that you are logged in to both accounts, you can run the update command:

uhd update

The update command will perform the following tasks:

1. Switch to the tools account
2. Run terraform init
3. Run terraform apply
4. Run Docker ECR login
5. Run Docker pull to grab the latest images from the tools account
6. Run Docker push to deploy the latest images to your environment
7. Switch to the dev account
8. Restart ecs services
9. Restart lambda functions
10. Switch back to tools account

Flushing caches

We cache very aggressively in the app to maximize performance. The trade off is that at the moment we must flush the caches if we make changes to CMS content or metric data. We have three caches:

1. A Redis cache which sits between the private API and the database
2. A CloudFront cache which sits in front of the public API load balancer
3. A CloudFront cache which sits in front of the front end load balancer

Depending on what has changed, there are a couple of options:

Flushing caches for CMS content changes

Both the Redis and front end CloudFront caches must be flushed.

First sign into AWS and switch to the dev account:

uhd aws login
uhd aws use uhd-dev

Then flush the caches:

uhd cache flush-redis
uhd cache flush-front-end
uhd cache fill-front-end

Flushing caches for metric data changes

All caches must be flushed for metric data changes:

uhd cache flush-redis
uhd cache flush-front-end
uhd cache flush-public-api
uhd cache fill-front-end
uhd cache fill-public-api

Flush all caches

Flushing the caches one by one, and waiting for each one to finish before starting the next one is tedious. To flush them all in one command:

uhd cache flush

Testing a feature branch in your dev environment

There are a few steps to test feature branch in your dev environment:

1. Clone all repos
2. Pull the latest code
3. Deploy the latest infra
4. Cut a custom image and push it (for API and front end changes)
5. Apply infra changes (for infra changes)
6. Test it

Clone all repos

Firstly, clone all the repos if you don't have them already. Our tooling expects the other repos to be cloned as siblings of this repo.

uhd gh clone

Pull the latest code

If you have been working on other tickets, it's recommended to switch all branches back to main and pull the latest code:

uhd gh main

If for some reason you don't want to do that, at least pull the latest infra:

git checkout main && git pull

Deploy the latest infra

This will pull the latest prod images, and update your env to use the latest infra:

uhd aws login
uhd update

Cut a custom image and push it (for API and front end changes)

Only use this step if you're testing API or front end changes.

Now we can checkout the branch for pull request. The pattern is:

uhd gh co [repo] [pull request number | url | branch]

For example:

uhd gh co api 123

Next, build and push a custom image:

uhd docker build [repo]

For example:

uhd docker build api

And finally restart the ECS services:

uhd aws use uhd-dev
uhd ecs restart-services

Flush the cache to reflect Front-end changes

uhd cache flush

Apply infra changes (for infra changes)

Only use this step if you're testing infra changes

First, checkout the branch for the pull request. For example:

uhd gh co infra 123

If you would like to preview the infra changes that Terraform will make:

uhd terraform plan

Then apply the changes:

uhd terraform apply

Test it

You can now commence testing the pull request in your dev environment.

Destroy

Destroy infrastructure

To run terraform destroy for the application layer in your dev environment:

uhd terraform destroy

Or to destroy for a specific layer and environment:

uhd terraform destroy:layer <layer> <env>

For example:

uhd terraform destroy:layer 20-app foo

Note that production-grade environments, which are set via the use_prod_sizing variable, have deletion protection enabled on the main db cluster.

To destroy the infra for these environments, you must switch use_prod_sizing off for that environment prior to running the above.

Remove secrets

When you run uhd terraform destroy then by default all secrets for that environment will be scheduled for deletion. This does not delete secrets immediately.

As such, you will need to delete the secrets associated with the environment separately. This can be done with the following command:

uhd secrets delete-all-secrets <env>

This command must be run from the dev account

Related repos

These repos contain the app source code:

• UKHSA-Internal/data-dashboard-frontend
• UKHSA-Internal/data-dashboard-api