Consul
Technical Specifications
This topic describes the technical specifications associated with using Consul API Gateway.
Requirements
Verify that your environment meets the following requirements prior to using Consul API Gateway.
Datacenter Requirements
Your datacenter must meet the following requirements prior to configuring the Consul API Gateway:
- Kubernetes 1.21+
- Kubernetes 1.24 is not supported at this time.
kubectl1.21+- Consul 1.11.2+
- HashiCorp Consul Helm chart 0.45.0+
- Consul Service Mesh must be deployed on the Kubernetes cluster that API Gateway is deployed on.
- Envoy: Envoy proxy support is determined by the Consul version deployed. Refer to Envoy Integration for details.
TCP Port Requirements
The following table describes the TCP port requirements for each component of the API Gateway.
| Port | Description | Component |
|---|---|---|
| 9090 | Secret discovery service (SDS) | Gateway controller pod Gateway instance pod |
| 20000 | Kubernetes readiness probe | Gateway instance pod |
| Configurable | Port for scraping Prometheus metrics. Disabled by default. | Gateway controller pod |
Consul Server Deployments
- Consul Editions supported: OSS and Enterprise
- Supported Consul Server deployment types:
- Self-Managed
- HCP Consul
Limited Support of some Consul Features
The following table lists API Gateway limitations related to specific Consul features
| Consul Feature | Limitation |
|---|---|
| Admin partitions | You can only deploy Consul API Gateway into the default admin partition. |
| Datacenter federation | If you are connecting multiple Consul datacenters to create a federated network, you can only deploy Consul API Gateway in the primary datacenter. |
| Routing between datacenters | If you are connecting multiple Consul datacenters to create a federated network, API Gateway can only route traffic to Services in the local datacenter. However, API Gateway can route to Services in other Kubernetes clusters when they are in the same Consul datacenter. Refer to Single Consul Datacenter in Multiple Kubernetes Clusters for more details. |
Deployment Environments
Consul API Gateway can be deployed in the following Kubernetes-based environments:
- Generic Kubernetes
- AWS Elastic Kubernetes Service (EKS)
- Google Kubernetes Engine (GKE)
- Azure Kubernetes Service (AKS)
Kubernetes Gateway API Specification - Supported Versions
See the Release Notes for the version of Consul API Gateway being used.
Resource Allocations
The following resources are allocated for each component of the API Gateway.
Gateway Controller Pod
- CPU: None. Either the namespace or cluster default is allocated, depending on the Kubernetes cluster configuration.
- Memory: None. Either the the namespace or cluster default is allocated, depending on the Kubernetes cluster configuration.
Gateway Instance Pod
- CPU: None. Either the namespace or cluster default is allocated, depending on the Kubernetes cluster configuration.
- Memory: None. Either the namespace or cluster default is allocated, depending on the Kubernetes cluster configuration.