This repository is HashiCorp Vault, a production-grade secrets management platform that secures, stores, and controls access to tokens, passwords, certificates, API keys, and other sensitive data. In production, it operates as a distributed system with a Go server backend, a RESTful HTTP API, a CLI client, and an optional Ember.js web UI. The architecture is modular: core server logic (token store, identity store, policy engine, audit brokerage, replication) is extensible via a plugin SDK for custom authentication methods (LDAP, OIDC, Kubernetes, AWS, etc.) and secrets engines (PKI, transit encryption, dynamic database credentials, SSH, etc.). Primary entry points are the `main.go` binary, the `api/` Go client library, and the `command/` CLI package. Data flows involve client requests routed through the HTTP handler to the logical backend, which uses a physical storage abstraction (Raft, Consul, file, etc.) and optionally triggers external plugins over gRPC. The system relies heavily on cryptographic primitives, a lease/expiration manager, and an event pipeline for audit logging and telemetry.
HashiCorp Consul is a distributed service mesh platform providing service discovery, health checking, dynamic configuration, and multi-datacenter federation. The codebase implements a full-stack system: a Go-based agent that runs as a server or client, a CLI tool for administration, a web UI built with Ember.js, and extensive gRPC/protobuf-based APIs for internal and external communication. The agent uses Raft consensus for state replication, maintains an in-memory database (memdb) for service and configuration state, and generates Envoy xDS configuration for service mesh gateways. Key entry points include the agent server (agent/consul/), CLI commands (command/), and the UI router (ui/packages/consul-ui/app/router.js). External dependencies include protobuf, gRPC, Envoy, and various cloud provider SDKs (AWS, Azure, GCP). The codebase is actively maintained with a large test suite covering unit, integration, and acceptance tests.
This is a Terraform module for deploying a production-grade HashiCorp Vault cluster on Google Compute Engine (GCE). It provisions all necessary networking (VPC, subnets, NAT, firewalls), a GCS bucket for Vault's storage backend, a KMS key for auto-unseal and TLS encryption, and manages the full lifecycle of Vault nodes via a managed instance group with autoscaling and autohealing. The module supports both internal and external load balancers, and includes an optional submodule (`modules/cluster`) for organizations that need to separate concerns (e.g., shared VPC setups). The core logic resides in the `modules/cluster` submodule, which contains instance templates, load balancer configuration, health checks, IAM bindings, and self-signed TLS certificate generation. A startup script template handles Vault installation, configuration, mTLS setup, logging agents, and security hardening (core dumps disabled, swap disabled, unprivileged user). The module is highly parameterized with ~60 input variables, allowing customization of machine types, Vault versions, networking, and TLS management. It is designed for high availability (HA) with GCS backend and auto-unseal via Cloud KMS. The repository includes examples, integration tests using Kitchen/Terraform and Inspec, and CI/CD pipelines, indicating a mature, community-maintained module. The code is clean and follows Google's Cloud Foundation Toolkit conventions, but it is relatively conventional Terraform infrastructure code, not particularly novel or reusable beyond its intended purpose.