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PRODUCTION-AWS-CLUSTER.md

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Creating a Production CKAN Cloud cluster using Amazon Kubernetes service

Prerequisites

  • An Amazon Account with admin privileges and matching access and secret keys.
  • An existing VPC with an existing subnet in each availability zone
  • An external domain registered to Amazon Route53
  • A CKAN Cloud Operator working environment

Provision the cluster

Terraform

In the CCO environment, go to the terraform/aws directory.

There you can find main.tf, which is a Terraform configuration file to provision a CCO cluster and some peripheral services.

It contains initializations for:

  • an EKS cluster with a node-group of 3 nodes
  • an RDS instance to serve as a centralized database for CKAN instance on a db.m4.large machine
  • an EFS filesystem for creating volumes containing configurations that need to be sheared among containers
  • all necessary security groups and IAM roles

you could use this file as-is or tweak it based on your needs and requirements.

To apply the configuration, use terraform apply. You will need to set some input variables as environment variables (or create a terraform.tfvars file - see Terraform's docs for more info), like so:

export TF_VAR_aws_access_key_id="..."        # AWS Access Key
export TF_VAR_aws_secret_access_key="..."    # AWS Secret Access Key
export TF_VAR_region="..."                   # Region where to apply (e.g. 'us-east-1')
export TF_VAR_vpc_id="..."                   # ID of the VPC where to apply 
export TF_VAR_cluster_name="..."             # Name of the cluster to create

./terraform apply

Once Terraform completes, it will generate a CCO initialization parameter object. You can save it to a file like so:

./terraform output cco-interactive-yaml > interactive.yaml

A kubectl configuration is also created in the process, and it will be saved in the local directory as kubeconfig_<cluster-name>. You should copy it to ~/.kube/config or set the KUBECONFIG environment variable to point to it.

CCO Provision Cluster

Once Terraform finishes the cluser setup, we can use CCO to initialize the cluster itself.

CCO initialize will:

  • Create all necessary K8S objects and configurations
  • Run required services on the cluster (DB proxy, EFS provisioner, SOLR Cloud etc.) and initialize them properly.

For an unattended initialization, using the outputs of terraform apply, run:

export CCO_INTERACTIVE_CI=interactive.yaml
ckan-cloud-operator cluster initialize --interactive --cluster-provider=aws

You can also run the same without setting the CCO_INTERACTIVE_CI environment variable for an interactive initialization session.