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Website: edits for docs/agent/http/catalog.
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Ryan Breen
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@ -4,13 +4,13 @@ page_title: "Catalog (HTTP)"
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sidebar_current: "docs-agent-http-catalog"
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description: >
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The Catalog is the endpoint used to register and deregister nodes,
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services, and checks. It also provides a number of query endpoints.
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services, and checks. It also provides query endpoints.
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---
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# Catalog HTTP Endpoint
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The Catalog is the endpoint used to register and deregister nodes,
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services, and checks. It also provides a number of query endpoints.
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services, and checks. It also provides query endpoints.
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The following endpoints are supported:
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@ -22,17 +22,17 @@ The following endpoints are supported:
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* [`/v1/catalog/service/<service>`](#catalog_service) : Lists the nodes in a given service
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* [`/v1/catalog/node/<node>`](#catalog_nodes) : Lists the services provided by a node
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The last 4 endpoints of the catalog support blocking queries and
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consistency modes.
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The `nodes` and `services` endpoints support blocking queries and
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tunable consistency modes.
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### <a name="catalog_register"></a> /v1/catalog/register
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The register endpoint is a low level mechanism for directly registering
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or updating entries in the catalog. It is usually recommended to use
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the agent local endpoints, as they are simpler and perform anti-entropy.
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The register endpoint is a low-level mechanism for registering or updating
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entries in the catalog. Note: it is usually preferrable instead to use the
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[agent endpoints](agent.html) for registration as they are simpler and perform anti-entropy.
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The register endpoint expects a JSON request body to be PUT. The request
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body must look like:
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body must look something like:
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```javascript
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{
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@ -61,37 +61,39 @@ body must look like:
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```
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The behavior of the endpoint depends on what keys are provided. The endpoint
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requires `Node` and `Address` to be provided, while `Datacenter` will be defaulted
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requires `Node` and `Address` to be provided while `Datacenter` will be defaulted
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to match that of the agent. If only those are provided, the endpoint will register
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the node with the catalog.
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If the `Service` key is provided, then the service will also be registered. If
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`ID` is not provided, it will be defaulted to `Service`. It is mandated that the
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ID be node-unique. The `Tags`, `Address` and `Port` fields can be omitted.
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If the `Service` key is provided, the service will also be registered. If
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`ID` is not provided, it will be defaulted to the value of the `Service.Service` property.
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Only one service with a given `ID` may be present per node. The service `Tags`, `Address`,
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and `Port` fields are all optional.
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If the `Check` key is provided, then a health check will also be registered. It
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is important to remember that this register API is very low level. This manipulates
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the health check entry, but does not setup a script or TTL to actually update the
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status. For that behavior, an agent local check should be setup.
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If the `Check` key is provided, a health check will also be registered. Note: this
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register API manipulates the health check entry in the Catalog, but it does not setup
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the script, TTL, or HTTP check to monitor the node's health. To truly enable a new
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health check, the check must either be provided in agent configuration or set via
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the [agent endpoint](agent.html).
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The `CheckID` can be omitted, and will default to the `Name`. Like before, the
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`CheckID` must be node-unique. The `Notes` is an opaque field that is meant to
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hold human readable text. If a `ServiceID` is provided that matches the `ID`
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of a service on that node, then the check is treated as a service level health
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The `CheckID` can be omitted and will default to the value of `Name`. As with `Service.ID`,
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the `CheckID` must be unique on this node. `Notes` is an opaque field that is meant to
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hold human-readable text. If a `ServiceID` is provided that matches the `ID`
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of a service on that node, the check is treated as a service level health
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check, instead of a node level health check. The `Status` must be one of
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"unknown", "passing", "warning", or "critical". The "unknown" status is used
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`unknown`, `passing`, `warning`, or `critical`. The `unknown` status is used
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to indicate that the initial check has not been performed yet.
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It is important to note that `Check` does not have to be provided with `Service`
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and visa-versa. They can be provided or omitted at will.
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and vice versa. A catalog entry can have either, neither, or both.
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If the API call succeeds a 200 status code is returned.
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If the API call succeeds, a 200 status code is returned.
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### <a name="catalog_deregister"></a> /v1/catalog/deregister
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The deregister endpoint is a low level mechanism for directly removing
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entries in the catalog. It is usually recommended to use the agent local
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endpoints, as they are simpler and perform anti-entropy.
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The deregister endpoint is a low-level mechanism for directly removing
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entries from the Catalog. Note: it is usually preferrable instead to use the
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[agent endpoints](agent.html) for deregistration as they are simpler and perform anti-entropy.
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The deregister endpoint expects a JSON request body to be PUT. The request
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body must look like one of the following:
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@ -120,15 +122,14 @@ body must look like one of the following:
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```
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The behavior of the endpoint depends on what keys are provided. The endpoint
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requires `Node` to be provided, while `Datacenter` will be defaulted
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to match that of the agent. If only `Node` is provided, then the node, and
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requires `Node` to be provided while `Datacenter` will be defaulted
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to match that of the agent. If only `Node` is provided, the node and
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all associated services and checks are deleted. If `CheckID` is provided, only
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that check belonging to the node is removed. If `ServiceID` is provided, then the
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service along with its associated health check (if any) is removed.
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that check is removed. If `ServiceID` is provided, the
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service and its associated health check (if any) is removed.
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If the API call succeeds a 200 status code is returned.
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### <a name="catalog_datacenters"></a> /v1/catalog/datacenters
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This endpoint is hit with a GET and is used to return all the
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@ -140,15 +141,15 @@ It returns a JSON body like this:
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["dc1", "dc2"]
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```
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This endpoint does not require a cluster leader, and as such
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will succeed even during an availability outage. It can thus be
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a simple check to see if any Consul servers are routable.
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This endpoint does not require a cluster leader and
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will succeed even during an availability outage. Therefore, it can be
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used as a simple check to see if any Consul servers are routable.
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### <a name="catalog_nodes"></a> /v1/catalog/nodes
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This endpoint is hit with a GET and returns the nodes known
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about in a given DC. By default the datacenter of the agent is queried,
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however the dc can be provided using the "?dc=" query parameter.
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This endpoint is hit with a GET and returns the nodes registered
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in a given DC. By default, the datacenter of the agent is queried;
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however, the dc can be provided using the "?dc=" query parameter.
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It returns a JSON body like this:
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@ -169,9 +170,9 @@ This endpoint supports blocking queries and all consistency modes.
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### <a name="catalog_services"></a> /v1/catalog/services
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This endpoint is hit with a GET and returns the services known
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about in a given DC. By default the datacenter of the agent is queried,
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however the dc can be provided using the "?dc=" query parameter.
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This endpoint is hit with a GET and returns the services registered
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in a given DC. By default, the datacenter of the agent is queried;
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however, the dc can be provided using the "?dc=" query parameter.
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It returns a JSON body like this:
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@ -186,18 +187,18 @@ It returns a JSON body like this:
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}
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```
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The main object keys are the service names, while the array
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provides all the known tags for a given service.
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The keys are the service names, and the array values provide all known
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tags for a given service.
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This endpoint supports blocking queries and all consistency modes.
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### <a name="catalog_service"></a> /v1/catalog/service/\<service\>
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This endpoint is hit with a GET and returns the nodes providing a service
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in a given DC. By default the datacenter of the agent is queried,
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however the dc can be provided using the "?dc=" query parameter.
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in a given DC. By default, the datacenter of the agent is queried;
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however, the dc can be provided using the "?dc=" query parameter.
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The service being queried must be provided after the slash. By default
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The service being queried must be provided on the path. By default
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all nodes in that service are returned. However, the list can be filtered
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by tag using the "?tag=" query parameter.
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@ -221,10 +222,10 @@ This endpoint supports blocking queries and all consistency modes.
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### <a name="catalog_node"></a> /v1/catalog/node/\<node\>
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This endpoint is hit with a GET and returns the node provided services.
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By default the datacenter of the agent is queried,
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however the dc can be provided using the "?dc=" query parameter.
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The node being queried must be provided after the slash.
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This endpoint is hit with a GET and returns the node's registered services.
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By default, the datacenter of the agent is queried;
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however, the dc can be provided using the "?dc=" query parameter.
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The node being queried must be provided on the path.
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It returns a JSON body like this:
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