Run Relayers
Steps to set up your own Snowbridge message relayers.
1. Setup
1.1 AWS account
The first thing you will need is an AWS account. Register if you do not have an account yet.
1.2 Clone infra repo
Clone the infrastructure repository:
git clone https://github.com/Snowfork/snowbridge-relayers-infra.git1.3 Install Ansible & dependencies
Install Ansible and its dependencies:
brew install pipx
pipx install --include-deps ansible boto3 botocore
pipx ensurepath
ansible-galaxy collection install amazon.aws1.4 Create AWS key pair
On the AWS console, under the EC2 section, create an ED25519 key pair called snowbridge-relayers-key.
1.5 Set AWS env variables
In the snowbridge-relayers-infra directory, create a .envrc file with the following values:
Add your AWS access key ID, secret access key and account ID.
1.6 Create EC2 instance
Run command from inside the snowbridge-relayers-infra directory:
ansible-playbook -i inventory/message-relayers/aws_ec2.yml infra.yml
It will create an EC2 instance to run the relayers on.
1.7 Add secrets
Add the following plaintext secrets to AWS secrets manager:
1.7.1 Lodestar, Polkadot Nodes & Chainalysis key
Ask for API keys for dwellir-eth-node-api-key, dwellir-polkadot-node-api-key and chainalysis-api-key in Snowbridge Relayer Telegram group: https://t.me/+I8Iel-Eaxcw3NjU0 (keys will be DM'ed to you).
1.7.2 Ethereum relay key
The asset-hub-ethereum-relay is a private key for an prefunded account on Polkadot BridgeHub. To retrieve the private key from an account on Polkadot with seedphrase "cat cow milk...", use subkey:
Use the secret seed hash as the snowbridge/asset-hub-ethereum-relay secret.
1.7.3 Parachain relayer key
The asset-hub-parachain-relay is a private key for a funded account on Ethereum.
1.8 Fund relayer accounts
The Ethereum and Polkadot BridgeHub account should be funded with $10 each, at least.
1.9 Set relayer number
Once you have set up all of the above, ask for a relayer ID and relayer count in Snowbridge Relayer Telegram group: https://t.me/+I8Iel-Eaxcw3NjU0. Add the key and ID in your .envrc file. Example .envrc file.
1.10 Install Relayers
Once you have added all the secrets, you can deploy your relayers:
Once it has completed, ssh into your instance.
Check that you see no relayer errors for each relayer:
1.11 Increment Relayer count
Once the relayer has started up successfully, all relaying parties should increment their relayer count config and redeploy their relayer config. This action will be prompted in the TG group.
1.12 Monitoring
To set up monitoring, register an account with PagerDuty.
Once registered, create a new service: Services -> Services Directory. Click on New. Call the service "Snowbridge Message Relayers"
Under service "Snowbridge Message Relayers", click on Integrations. Add a new Amazon Cloudwatch integration. Copy the integration URL.
In your snowbridge-relayers-infra project, copy the URL to your .envrc file:
Now run the Ansible script to create all the necessary metrics, alarms, topic and subscription on AWS:
Test the alarms by triggering a failure condition (i.e. change the URL of one of the service endpoints to an invalid value).
2. Upgrade
To upgrade the relayer, run the following commands:
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