0b79707beb
The grpc resolver implementation is fed from changes to the router.Router. Within the router there is a map of various areas storing the addressing information for servers in those areas. All map entries are of the WAN variety except a single special entry for the LAN. Addressing information in the LAN "area" are local addresses intended for use when making a client-to-server or server-to-server request. The client agent correctly updates this LAN area when receiving lan serf events, so by extension the grpc resolver works fine in that scenario. The server agent only initially populates a single entry in the LAN area (for itself) on startup, and then never mutates that area map again. For normal RPCs a different structure is used for LAN routing. Additionally when selecting a server to contact in the local datacenter it will randomly select addresses from either the LAN or WAN addressed entries in the map. Unfortunately this means that the grpc resolver stack as it exists on server agents is either broken or only accidentally functions by having servers dial each other over the WAN-accessible address. If the operator disables the serf wan port completely likely this incidental functioning would break. This PR enforces that local requests for servers (both for stale reads or leader forwarded requests) exclusively use the LAN "area" information and also fixes it so that servers keep that area up to date in the router. A test for the grpc resolver logic was added, as well as a higher level full-stack test to ensure the externally perceived bug does not return. |
||
|---|---|---|
| .changelog | ||
| .github | ||
| .release | ||
| acl | ||
| agent | ||
| api | ||
| bench | ||
| build-support | ||
| command | ||
| connect | ||
| contributing | ||
| docs | ||
| envoyextensions | ||
| grafana | ||
| internal | ||
| ipaddr | ||
| lib | ||
| logging | ||
| proto | ||
| proto-public | ||
| sdk | ||
| sentinel | ||
| service_os | ||
| snapshot | ||
| test | ||
| testrpc | ||
| tlsutil | ||
| tools/internal-grpc-proxy | ||
| troubleshoot | ||
| types | ||
| ui | ||
| version | ||
| website | ||
| .copywrite.hcl | ||
| .dockerignore | ||
| .gitattributes | ||
| .gitignore | ||
| .golangci.yml | ||
| CHANGELOG.md | ||
| Dockerfile | ||
| GNUmakefile | ||
| LICENSE | ||
| NOTICE.md | ||
| README.md | ||
| buf.work.yaml | ||
| fixup_acl_move.sh | ||
| go.mod | ||
| go.sum | ||
| main.go | ||
README.md
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.
-
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.
-
Key/Value Storage - A flexible key/value store enables storing dynamic configuration, feature flagging, coordination, leader election and more. The simple HTTP API makes it easy to use anywhere.
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.