Milestone Review

Grant Milestone Delivery

Technical Contributions Overview

• Goal was to build a set of load balanced endpoints for Polkadot and Substrate chains using industry-standard DevOps tooling
• A consideration was given to find the right level of modularity and reusability
• Dual VM/k8s architecture was chosen to both provide some familiarity to those new to microservices and to separate out different concerns
  • If people choose to only run a subset/combination of modules, that's still possible and can reduce their complexity/spend based on needs

General Architecture

DNS

• Chose to have a single provider (CF) handle root domain
  • Partly to be able to have a single point of contact to manage the domain
  • Partly because CF will eventually handle geo-routing general API endpoints
• Delegations are made via TF to hosted subdomain zones on each provider
  • This allows for control over subdomains to be handled by cloud provider, which means more automation around:
    • let's encrypt certs
    • resource A-records (if necessary/desired)
    • API endpoint aggregation

Infrastructure

Library Nodes

• Library (full) nodes are deployed on VMs in an autoscaling group
• Internal load balancers are used to route RPC API requests across instances within the ASG
• Library node images are built from a base Ubuntu 18.04 image, which has been configured with Ansible to include the Polakdot client, Prometheus monitoring, and Consul service discovery