5fb6ab6a3a
* Add function to get update channel for watching HCP Link * Add MonitorHCPLink function This function can be called in a goroutine to manage the lifecycle of the HCP manager. * Update HCP Manager config in link monitor before starting This updates HCPMonitorLink so it updates the HCP manager with an HCP client and management token when a Link is upserted. * Let MonitorHCPManager handle lifecycle instead of link controller * Remove cleanup from Link controller and move it to MonitorHCPLink Previously, the Link Controller was responsible for cleaning up the HCP-related files on the file system. This change makes it so MonitorHCPLink handles this cleanup. As a result, we are able to remove the PlacementEachServer placement strategy for the Link controller because it no longer needs to do this per-node cleanup. * Remove HCP Manager dependency from Link Controller The Link controller does not need to have HCP Manager as a dependency anymore, so this removes that dependency in order to simplify the design. * Add Linked prefix to Linked status variables This is in preparation for adding a new status type to the Link resource. * Add new "validated" status type to link resource The link resource controller will now set a "validated" status in addition to the "linked" status. This is needed so that other components (eg the HCP manager) know when the Link is ready to link with HCP. * Fix tests * Handle new 'EndOfSnapshot' WatchList event * Fix watch test * Remove unnecessary config from TestAgent_scadaProvider Since the Scada provider is now started on agent startup regardless of whether a cloud config is provided, this removes the cloud config override from the relevant test. This change is not exactly related to the changes from this PR, but rather is something small and sort of related that was noticed while working on this PR. * Simplify link watch test and remove sleep from link watch This updates the link watch test so that it uses more mocks and does not require setting up the infrastructure for the HCP Link controller. This also removes the time.Sleep delay in the link watcher loop in favor of an error counter. When we receive 10 consecutive errors, we shut down the link watcher loop. * Add better logging for link validation. Remove EndOfSnapshot test. * Refactor link monitor test into a table test * Add some clarifying comments to link monitor * Simplify link watch test * Test a bunch more errors cases in link monitor test * Use exponential backoff instead of errorCounter in LinkWatch * Move link watch and link monitor into a single goroutine called from server.go * Refactor HCP link watcher to use single go-routine. Previously, if the WatchClient errored, we would've never recovered because we never retry to create the stream. With this change, we have a single goroutine that runs for the life of the server agent and if the WatchClient stream ever errors, we retry the creation of the stream with an exponential backoff.
Consul
Consul is a distributed, highly available, and data center aware solution to connect and configure applications across dynamic, distributed infrastructure.
- Website: https://www.consul.io
- Tutorials: HashiCorp Learn
- Forum: Discuss
Consul provides several key features:
-
Multi-Datacenter - Consul is built to be datacenter aware, and can support any number of regions without complex configuration.
-
Service Mesh - Consul Service Mesh enables secure service-to-service communication with automatic TLS encryption and identity-based authorization. Applications can use sidecar proxies in a service mesh configuration to establish TLS connections for inbound and outbound connections with Transparent Proxy.
-
API Gateway - Consul API Gateway manages access to services within Consul Service Mesh, allow users to define traffic and authorization policies to services deployed within the mesh.
-
Service Discovery - Consul makes it simple for services to register themselves and to discover other services via a DNS or HTTP interface. External services such as SaaS providers can be registered as well.
-
Health Checking - Health Checking enables Consul to quickly alert operators about any issues in a cluster. The integration with service discovery prevents routing traffic to unhealthy hosts and enables service level circuit breakers.
-
Dynamic App Configuration - An HTTP API that allows users to store indexed objects within Consul, for storing configuration parameters and application metadata.
Consul runs on Linux, macOS, FreeBSD, Solaris, and Windows and includes an optional browser based UI. A commercial version called Consul Enterprise is also available.
Please note: We take Consul's security and our users' trust very seriously. If you believe you have found a security issue in Consul, please responsibly disclose by contacting us at security@hashicorp.com.
Quick Start
A few quick start guides are available on the Consul website:
- Standalone binary install: https://learn.hashicorp.com/collections/consul/get-started-vms
- Minikube install: https://learn.hashicorp.com/tutorials/consul/kubernetes-minikube
- Kind install: https://learn.hashicorp.com/tutorials/consul/kubernetes-kind
- Kubernetes install: https://learn.hashicorp.com/tutorials/consul/kubernetes-deployment-guide
- Deploy HCP Consul: https://learn.hashicorp.com/tutorials/consul/hcp-gs-deploy
Documentation
Full, comprehensive documentation is available on the Consul website: https://consul.io/docs
Contributing
Thank you for your interest in contributing! Please refer to CONTRIBUTING.md for guidance. For contributions specifically to the browser based UI, please refer to the UI's README.md for guidance.