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Prometheus configuration on AWS

Terraform configuration to manage a Prometheus server running on AWS.

Setup

Install dependencies

brew bundle
tfenv install # this will pick up the version from .terraform-version

Allow access to secrets

You will need to clone the re-secrets repo into ~/.password-store/re-secrets:

git clone git@github.com:alphagov/re-secrets.git ~/.password-store/re-secrets

Deploying Terraform

cd terraform/projects/PROJECT-ENV/
gds aws re-prom-<env> -- terraform init
gds aws re-prom-<env> -- terraform plan
gds aws re-prom-<env> -- terraform apply

eg

cd terraform/projects/app-ecs-albs-staging
gds aws re-prom-staging -- terraform plan

Deploy EC2 Prometheus with zero downtime

To avoid all three instances being respun at the same time you can do one instance at a time using:

gds aws re-prom-<env> -- terraform apply -target=module.paas-config.aws_route53_record.prom_ec2_a_record[i] -target=module.prometheus.aws_volume_attachment.attach-prometheus-disk[i] -target=module.prometheus.aws_instance.prometheus[i] -target=module.prometheus.aws_lb_target_group_attachment.prom_target_group_attachment[i]

where i is 0, 1 or 2.

EC2 Prometheus

Prometheis are not deployed on Amazon ECS and are instead deployed using the prom-ec2 modules onto EC2 instances. For details of how to develop and deploy them see the terraform/modules/prom-ec2 README.

ECS

Alertmanager and NGINX are deployed on Amazon ECS Fargate.

License

MIT License