Consul
Consul on AWS Elastic Container Service (ECS) Configuration Reference
This topic describes configuration options for the JSON configuration format used by the consul-ecs binary. This configuration is passed to the consul-ecs binary as a string using the CONSUL_ECS_CONFIG_JSON environment variable.
This configuration format follows a JSON schema that can be used for validation.
Terraform mesh-task module configuration
The mesh-task Terraform module provides input variables for commonly used fields. The following table shows which Terraform input variables correspond to each field of the Consul ECS configuration. Refer to the Terraform registry documentation for a complete reference of supported input variables for the mesh-task module.
| Terraform Input Variable | Consul ECS Config Field |
|---|---|
upstreams | proxy.upstreams |
checks | service.checks |
consul_service_name | service.name |
consul_service_tags | service.tags |
consul_service_meta | service.meta |
consul_namespace | service.namespace |
consul_partition | service.partition |
Each of these Terraform input variables follows the Consul ECS configuration schema. The remaining fields of the Consul ECS configuration that are not listed in this table can be passed using the consul_ecs_config input variable.
Top-level fields
These are the top-level fields for the Consul ECS configuration format.
| Field | Type | Required | Description |
|---|---|---|---|
bootstrapDir | string | required | The directory at which to mount the shared volume where Envoy bootstrap configuration is written by consul-ecs mesh-init. |
consulCACertFile | string | optional | The file path of the Consul server CA certificate. |
consulHTTPAddr | string | optional | The HTTP(S) URL of the Consul server. Required when authMethod.enabled is set |
consulLogin | object | optional | Configuration for logging into the AWS IAM auth method. |
gateway | object | optional | Configuration for the gateway proxy registration. |
healthSyncContainers | array | optional | The names of containers that will have health check status synced from ECS into Consul. Cannot be specified with service.checks. |
logLevel | string | optional | Sets the log level for the consul-ecs mesh-init and consul-ecs health-sync commands. Defaults to INFO. Must be one of TRACE, DEBUG, INFO, WARN, ERROR, or null. |
proxy | object | optional | Configuration for the sidecar proxy registration with Consul. |
service | object | optional | Configuration for Consul service registration. |
consulLogin
Configuration for logging into the AWS IAM auth method.
| Field | Type | Required | Description |
|---|---|---|---|
enabled | boolean | optional | Enables logging into Consul's AWS IAM auth method to obtain an ACL token. The auth method must be configured on the Consul server and the ECS task role must be trusted by the auth method. After logging in, the token is written to the file <bootstrapDir>/service-token. |
extraLoginFlags | array | optional | Additional CLI flags to pass to the consul login command. These are appended to the command consul login -type aws -method <name> -token-sink-file <file> -aws-auto-bearer-token -aws-include-identity. |
includeEntity | boolean | optional | Adds the -aws-include-entity flag to the consul login command. Defaults to true. Set to false to remove the flag from the command. The -aws-include-entity flag should only be passed if the Consul AWS IAM auth method is configured with EnableIAMEntityDetails=true. |
method | string | optional | The name of Consul auth method. This is passed as the -method option to the consul login command. Defaults to iam-ecs-service-token. |
gateway
Configuration for the gateway proxy registration.
| Field | Type | Required | Description |
|---|---|---|---|
kind | string | required | Specifies the type of gateway to register. Must be mesh-gateway. |
lanAddress | object | optional | LAN address and port for the gateway. If not specified, defaults to the task/node address. |
meta | object | optional | Key-value pairs of metadata to include for the gateway. |
name | string | optional | The name the gateway will be registered as in Consul. Defaults to the Task family name. |
namespace | string | optional | Enterprise Consul namespace in which the gateway will be registered. |
partition | string | optional | Enterprise Consul admin partition in which the gateway will be registered. |
proxy | object | optional | Object that contains the proxy parameters. |
tags | array | optional | List of string values that can be used to add labels to the gateway. |
wanAddress | object | optional | WAN address and port for the gateway. If not specified, defaults to the task/node address. |
gateway.lanAddress
LAN address and port for the gateway. If not specified, defaults to the task/node address.
| Field | Type | Required | Description |
|---|---|---|---|
address | string | optional | |
port | integer | optional |
gateway.proxy
Object that contains the proxy parameters.
| Field | Type | Required | Description |
|---|---|---|---|
config | object | optional |
gateway.wanAddress
WAN address and port for the gateway. If not specified, defaults to the task/node address.
| Field | Type | Required | Description |
|---|---|---|---|
address | string | optional | |
port | integer | optional |
proxy
Configuration for the sidecar proxy registration with Consul.
| Field | Type | Required | Description |
|---|---|---|---|
config | object | optional | Object value that specifies an opaque JSON configuration. The JSON is stored and returned along with the service instance when called from the API. |
meshGateway | object | optional | Specifies the mesh gateway configuration for the proxy. |
upstreams | array | optional | The list of the upstream services that the proxy should create listeners for. |
proxy.meshGateway
Specifies the mesh gateway configuration for the proxy.
| Field | Type | Required | Description |
|---|---|---|---|
mode | string | required | Specifies how upstreams with a remote destination datacenter are resolved. Must be one of none, local, or remote. |
proxy.upstreams
The list of the upstream services that the proxy should create listeners for. Each upstream object may contain the following fields.
| Field | Type | Required | Description |
|---|---|---|---|
config | object | optional | Specifies opaque configuration options that will be provided to the proxy instance for the upstream. |
datacenter | string | optional | Specifies the datacenter to issue the discovery query to. |
destinationName | string | required | Specifies the name of the upstream service or prepared query to route the service mesh to. |
destinationNamespace | string | optional | Enterprise Specifies the namespace containing the upstream service. |
destinationPartition | string | optional | Enterprise Specifies the name of the admin partition containing the upstream service. |
destinationType | string | optional | Specifies the type of discovery query the proxy should use for finding service mesh instances. Must be one of service, prepared_query, or null. |
localBindAddress | string | optional | Specifies the address to bind a local listener to. |
localBindPort | integer | required | Specifies the port to bind a local listener to. The application will make outbound connections to the upstream from the local port. |
meshGateway | object | optional | Specifies the mesh gateway configuration for the proxy for this upstream. |
proxy.upstreams.meshGateway
Specifies the mesh gateway configuration for the proxy for this upstream.
| Field | Type | Required | Description |
|---|---|---|---|
mode | string | required | Specifies how the upstream with a remote destination datacenter gets resolved. Must be one of none, local, or remote. |
service
Configuration for Consul service registration.
| Field | Type | Required | Description |
|---|---|---|---|
checks | array | optional | The list of Consul checks for the service. Cannot be specified with healthSyncContainers. |
enableTagOverride | boolean | optional | Determines if the anti-entropy feature for the service is enabled |
meta | object | optional | Key-value pairs of metadata to include for the Consul service. |
name | string | optional | The name the service will be registered as in Consul. Defaults to the Task family name if empty or null. |
namespace | string | optional | Enterprise The Consul namespace where the service will be registered. |
partition | string | optional | Enterprise The Consul admin partition where the service will be registered. |
port | integer | required | Port the application listens on, if any. |
tags | array | optional | List of string values that can be used to add service-level labels. |
weights | object | optional | Configures the weight of the service in terms of its DNS service (SRV) response. |
service.checks
Defines the Consul checks for the service. Each check object may contain the following fields.
| Field | Type | Required | Description |
|---|---|---|---|
aliasNode | string | optional | Specifies the ID of the node for an alias check. |
aliasService | string | optional | Specifies the ID of a service for an alias check. |
args | array | optional | Command arguments to run to update the status of the check. |
body | string | optional | Specifies a body that should be sent with HTTP checks. |
checkId | string | optional | The unique ID for this check on the node. Defaults to the check name. |
failuresBeforeCritical | integer | optional | Specifies the number of consecutive unsuccessful results required before check status transitions to critical. |
grpc | string | optional | Specifies a gRPC check. Must be an endpoint that supports the standard gRPC health checking protocol. The endpoint will be probed every interval. |
grpcUseTls | boolean | optional | Specifies whether to use TLS for this gRPC health check. |
h2ping | string | optional | Specifies this is an h2ping check. Must be an address, which will be pinged every interval. |
h2pingUseTls | boolean | optional | Specifies whether TLS is used for an h2ping check. |
header | object | optional | Specifies a set of headers that should be set for HTTP checks. Each header can have multiple values. |
http | string | optional | Specifies this is an HTTP check. Must be a URL against which request is performed every interval. |
interval | string | optional | Specifies the frequency at which to run this check. Required for HTTP, TCP, and UDP checks. |
method | string | optional | Specifies the HTTP method to be used for an HTTP check. When no value is specified, GET is used. |
name | string | optional | The name of the check. |
notes | string | optional | Specifies arbitrary information for humans. This is not used by Consul internally. |
os_service | string | optional | Specifies the name of a service on which to perform an OS service check. The check runs according the frequency specified in the interval parameter. |
status | string | optional | Specifies the initial status the health check. Must be one of passing, warning, critical, maintenance, or null. |
successBeforePassing | integer | optional | Specifies the number of consecutive successful results required before check status transitions to passing. |
tcp | string | optional | Specifies this is a TCP check. Must be an IP/hostname plus port to which a TCP connection is made every interval. |
tcpUseTls | boolean | optional | Specifies whether to use TLS for this TCP health check. If TLS is enabled, then by default, a valid TLS certificate is expected. Certificate verification can be disabled by setting TLSSkipVerify to true. |
timeout | string | optional | Specifies a timeout for outgoing connections. Applies to script, HTTP, TCP, UDP, and gRPC checks. Must be a duration string, such as 10s or 5m. |
tlsServerName | string | optional | Specifies an optional string used to set the SNI host when connecting via TLS. |
tlsSkipVerify | boolean | optional | Specifies if the check should verify the chain and hostname of the certificate presented by the server being checked. Set to true to disable verification. We recommend setting to false for production use. Default is false. Supported check types: HTTP, H2Ping, gRPC, and TCP |
ttl | string | optional | Specifies this is a TTL check. Must be a duration string, such as 10s or 5m. |
udp | string | optional | Specifies this is a UDP check. Must be an IP/hostname plus port to which UDP datagrams are sent every interval. |
service.weights
Configures the weight of the service in terms of its DNS service (SRV) response.
| Field | Type | Required | Description |
|---|---|---|---|
passing | integer | required | Weight for the service when its health checks are passing. |
warning | integer | required | Weight for the service when it has health checks in warning status. |