terraform-riak

terraform-riak allows you to provision a Riak KV or a Riak TS cluster on AWS with a single Terraform command. You can also provision a separate instance pre-configured with the Python, Java and Erlang clients.

Setup

Configure AWS Access

You will need to create an AWS SSH key pair as well as a set of access keys. Please note that AWS SSH keys are region-specific, and that terraform-riak defaults to the US-East (N. Virginia) region.

Set the following environment variables accordingly:

$ export KEY_PATH=[PATH_TO_AWS_SSH_KEY]
$ export AWS_ACCESS_KEY=[AWS_ACCESS_KEY]
$ export AWS_SECRET_KEY=[AWS_SECRET_KEY]

For example:

$ export KEY_PATH=$HOME/.ssh/aws-us-east.pem
$ export AWS_ACCESS_KEY=AKIAI3MEITMDDTB00000
$ export AWS_SECRET_KEY=b/keH4gFgERz12K3Eai7Q+zGZG8PJ1f4Oy100000

Check your user and instance configuration on AWS

Terraform swallows error messages - so you get something like "doesn't work, meh" so it is best to ensure that your AWS user and security stuff is correct and lets you connect to boxes before trying to use terraform.

You need to set up a user:

Give that user access to do stuff on the box with a security policy - AmazonEC2FullAccess is the brute force one:

But you also need to 'wire up' the instances to make them visible to the outside world via Security Groups:

Vagrant local environment

The repo includes a Vagrantfile for your convenience. The OS used by Vagrant can be set using the VAGRANT_OS environment variable (set to UBUNTU or CENTOS).

$ git clone https://github.com/basho-labs/terraform-riak.git
$ cd terraform-riak
$ export VAGRANT_OS=UBUNTU
$ vagrant plugin install vagrant-env
$ vagrant up
$ vagrant ssh

Verify that your AWS credentials and access keys have been properly set in aws/global.tf (scroll to the bottom).

Non-Vagrant local environment

Use the relevant bootstrap script as a reference for the required dependencies or just run it as-is:

$ git clone https://github.com/basho-labs/terraform-riak.git
$ cd terraform-riak
$ bash bootstrap-ubuntu.sh
$ PATH=$PATH:$PWD

If you opt not to run one of the bootstrap scripts directly, you will need to populate the AWS configs in aws/global.tf directly.

Usage

Create working subdirectories for your cluster and client(s)

$ mkdir -p working/cluster working/clients

Provision Riak

The terraform apply command takes the following variables for a Riak cluster config:

• product_version (default: ts-1.3; options: ts-1.3, ts-1.2, kv-2.1.3, kv-2.0.6)
• platform (default: ubuntu14; options: rhel6, rhel7, ubuntu12, ubuntu14, debian7)
• nodes (default: 5; options: must be >= 3)
• instance_type (default: t2.medium; options: any AWS instance type)

The following command uses the default settings to provision a 5-node Riak TS 1.3 cluster using the Ubuntu 14 package:

$ cd working/cluster
$ terraform apply ../../aws/riak

To provision a Riak KV 2.1.3 cluster using the RHEL 6 package:

$ terraform apply -var 'product_version=kv-2.1.3' -var 'platform=rhel6' ../../aws/riak

Provision a client

To provision a client instance, first change to the clients working subdirectory:

$ cd working/clients
$ terraform apply ../../aws/clients

You can provision multiple client instances with a single command by adding the count variable:

$ cd working/clients
$ terraform apply -var 'count=2' ../../aws/clients

Take note of the IPs printed to the console at the end of each process.

Destroy infrastructure

To destroy provisioned infrastructure, simply replace apply with destroy in the commands above. Run the command from the relevant working subdirectory. For example:

$ cd working/cluster
$ terraform destroy ../../aws/riak

$ cd working/clients
$ terraform destroy ../../aws/clients

Riak TS sample data & queries

The Riak client config downloads a sample time series data file (containing traffic data), and includes example Python scripts to both load and query the data. To run the examples, first SSH in to your client instance:

$ ssh -i [PATH_TO_AWS_SSH_KEY] ubuntu@[CLIENT_IP]

Then, run:

$ export RIAK_IP=[RIAK_PRIVATE_IP]
$ export TABLE=table1
$ python examples/load.py $RIAK_IP $TABLE
$ python examples/query.py $RIAK_IP $TABLE

You can get a RIAK_PRIVATE_IP from the output of the relevant terraform apply command. The table name table1 is arbitrary.

Remote command execution with Ansible

Ansible can be used to remotely execute ad-hoc commands against a client or the Riak cluster. Ansible is pre-installed, but requires activation:

$ source ansible/hacking/env-setup
$ ssh-agent bash
$ ssh-add [PATH_TO_AWS_SSH_KEY]

Command example:

$ RIAK_IP=[RIAK_PUBLIC_IP]
$ ansible all -i "$RIAK_IP," -u "ubuntu" -m shell -a "sudo riak ping"
$ ansible all -i "$RIAK_IP," -u "ubuntu" -m shell -a "sudo riak-admin member_status"

Ansible ad-hoc commands require the target host's Linux user name (-u parameter above). Use ubuntu for Ubuntu-based instances, ec2-user for RHEL-based instances and admin for Debian-based instances.