--- layout: api page_title: Catalog - HTTP API sidebar_current: api-catalog description: |- The /catalog endpoints register and deregister nodes, services, and checks in Consul. --- # Catalog HTTP API The `/catalog` endpoints register and deregister nodes, services, and checks in Consul. The catalog should not be confused with the agent, since some of the API methods look similar. ## Register Entity This endpoint is a low-level mechanism for registering or updating entries in the catalog. It is usually preferable to instead use the [agent endpoints](/api/agent.html) for registration as they are simpler and perform [anti-entropy](/docs/internals/anti-entropy.html). | Method | Path | Produces | | ------ | ---------------------------- | -------------------------- | | `PUT` | `/catalog/register` | `application/json` | The table below shows this endpoint's support for [blocking queries](/api/index.html#blocking-queries), [consistency modes](/api/index.html#consistency-modes), and [required ACLs](/api/index.html#acls). | Blocking Queries | Consistency Modes | ACL Required | | ---------------- | ----------------- | -------------------------- | | `NO` | `none` | `node:write,service:write` | ### Parameters - `ID` `(string: "")` - An optional UUID to assign to the service. If not provided, one is generated. This must be a 36-character UUID. - `Node` `(string: )` - Specifies the node ID to register. - `Address` `(string: )` - Specifies the address to register. - `Datacenter` `(string: "")` - Specifies the datacenter, which defaults to the agent's datacenter if not provided. - `TaggedAddresses` `(map: nil)` - Specifies the tagged addresses. - `Meta` `(map: nil)` - Specifies arbitrary KV metadata pairs for filtering purposes. - `Service` `(Service: nil)` - Specifies to register a service. If `ID` is not provided, it will be defaulted to the value of the `Service.Service` property. Only one service with a given `ID` may be present per node. The service `Tags`, `Address`, and `Port` fields are all optional. - `Check` `(Check: nil)` - Specifies to register a check. The register API manipulates the health check entry in the Catalog, but it does not setup the script, TTL, or HTTP check to monitor the node's health. To truly enable a new health check, the check must either be provided in agent configuration or set via the [agent endpoint](agent.html). The `CheckID` can be omitted and will default to the value of `Name`. As with `Service.ID`, the `CheckID` must be unique on this node. `Notes` is an opaque field that is meant to hold human-readable text. If a `ServiceID` is provided that matches the `ID` of a service on that node, the check is treated as a service level health check, instead of a node level health check. The `Status` must be one of `passing`, `warning`, or `critical`. Multiple checks can be provided by replacing `Check` with `Checks` and sending an array of `Check` objects. It is important to note that `Check` does not have to be provided with `Service` and vice versa. A catalog entry can have either, neither, or both. ### Sample Payload ```json { "Datacenter": "dc1", "ID": "40e4a748-2192-161a-0510-9bf59fe950b5", "Node": "foobar", "Address": "192.168.10.10", "TaggedAddresses": { "lan": "192.168.10.10", "wan": "10.0.10.10" }, "NodeMeta": { "somekey": "somevalue" }, "Service": { "ID": "redis1", "Service": "redis", "Tags": [ "primary", "v1" ], "Address": "127.0.0.1", "Port": 8000 }, "Check": { "Node": "foobar", "CheckID": "service:redis1", "Name": "Redis health check", "Notes": "Script based health check", "Status": "passing", "ServiceID": "redis1" } } ``` ### Sample Request ```text $ curl \ --request PUT \ --data @payload.json \ https://consul.rocks/v1/catalog/register ``` ## Deregister Entity This endpoint is a low-level mechanism for directly removing entries from the Catalog. It is usually preferable to instead use the [agent endpoints](/api/agent.html) for deregistration as they are simpler and perform [anti-entropy](/docs/internals/anti-entropy.html). | Method | Path | Produces | | ------ | ---------------------------- | -------------------------- | | `PUT` | `/catalog/deregister` | `application/json` | The table below shows this endpoint's support for [blocking queries](/api/index.html#blocking-queries), [consistency modes](/api/index.html#consistency-modes), and [required ACLs](/api/index.html#acls). | Blocking Queries | Consistency Modes | ACL Required | | ---------------- | ----------------- | -------------------------- | | `NO` | `none` | `node:write,service:write` | ### Parameters The behavior of the endpoint depends on what keys are provided. - `Node` `(string: )` - Specifies the ID of the node. If no other values are provided, this node, all its services, and all its checks are removed. - `Datacenter` `(string: "")` - Specifies the datacenter, which defaults to the agent's datacenter if not provided. - `CheckID` `(string: "")` - Specifies the ID of the check to remove. - `ServiceID` `(string: "")` - Specifies the ID of the service to remove. The service and all associated checks will be removed. ### Sample Payloads ```json { "Datacenter": "dc1", "Node": "foobar" } ``` ```json { "Datacenter": "dc1", "Node": "foobar", "CheckID": "service:redis1" } ``` ```json { "Datacenter": "dc1", "Node": "foobar", "ServiceID": "redis1" } ``` ### Sample Request ```text $ curl \ --request PUT \ --data @payload.json \ https://consul.rocks/v1/catalog/deregister ``` ## List Datacenters This endpoint returns the list of all known datacenters. The datacenters will be sorted in ascending order based on the estimated median round trip time from the server to the servers in that datacenter. This endpoint does not require a cluster leader and will succeed even during an availability outage. Therefore, it can be used as a simple check to see if any Consul servers are routable. | Method | Path | Produces | | ------ | ---------------------------- | -------------------------- | | `GET` | `/catalog/datacenters` | `application/json` | The table below shows this endpoint's support for [blocking queries](/api/index.html#blocking-queries), [consistency modes](/api/index.html#consistency-modes), and [required ACLs](/api/index.html#acls). | Blocking Queries | Consistency Modes | ACL Required | | ---------------- | ----------------- | ------------ | | `NO` | `none` | `none` | ### Sample Request ```text $ curl \ https://consul.rocks/v1/catalog/datacenters ``` ### Sample Respons ```json ["dc1", "dc2"] ``` ## List Nodes This endpoint and returns the nodes registered in a given datacenter. | Method | Path | Produces | | ------ | ---------------------------- | -------------------------- | | `GET` | `/catalog/nodes` | `application/json` | The table below shows this endpoint's support for [blocking queries](/api/index.html#blocking-queries), [consistency modes](/api/index.html#consistency-modes), and [required ACLs](/api/index.html#acls). | Blocking Queries | Consistency Modes | ACL Required | | ---------------- | ----------------- | ------------ | | `YES` | `all` | `node:read` | ### Parameters - `dc` `(string: "")` - Specifies the datacenter to query. This will default to the datacenter of the agent being queried. This is specified as part of the URL as a query parameter. - `near` `(string: "")` - Specifies a node name to sort the node list in ascending order based on the estimated round trip time from that node. Passing `?near=_agent` will use the agent's node for the sort. This is specified as part of the URL as a query parameter. - `node-meta` `(string: "")` - Specifies a desired node metadata key/value pair of the form `key:value`. This parameter can be specified multiple times, and will filter the results to nodes with the specified key/value pairs. This is specified as part of the URL as a query parameter. ### Sample Request ```text $ curl \ https://consul.rocks/v1/catalog/nodes ``` ### Sample Response ```json [ { "ID": "40e4a748-2192-161a-0510-9bf59fe950b5", "Node": "baz", "Address": "10.1.10.11", "Datacenter": "dc1", "TaggedAddresses": { "lan": "10.1.10.11", "wan": "10.1.10.11" }, "Meta": { "instance_type": "t2.medium" } }, { "ID": "8f246b77-f3e1-ff88-5b48-8ec93abf3e05", "Node": "foobar", "Address": "10.1.10.12", "Datacenter": "dc2", "TaggedAddresses": { "lan": "10.1.10.11", "wan": "10.1.10.12" }, "Meta": { "instance_type": "t2.large" } } ] ``` ## List Services This endpoint returns the services registered in a given datacenter. | Method | Path | Produces | | ------ | ---------------------------- | -------------------------- | | `GET` | `/catalog/services` | `application/json` | The table below shows this endpoint's support for [blocking queries](/api/index.html#blocking-queries), [consistency modes](/api/index.html#consistency-modes), and [required ACLs](/api/index.html#acls). | Blocking Queries | Consistency Modes | ACL Required | | ---------------- | ----------------- | -------------- | | `TEST` | `all` | `service:read` | ### Parameters - `dc` `(string: "")` - Specifies the datacenter to query. This will default to the datacenter of the agent being queried. This is specified as part of the URL as a query parameter. - `node-meta` `(string: "")` - Specifies a desired node metadata key/value pair of the form `key:value`. This parameter can be specified multiple times, and will filter the results to nodes with the specified key/value pairs. This is specified as part of the URL as a query parameter. ### Sample Request ```text $ curl \ https://consul.rocks/v1/catalog/services ``` ### Sample Response ```json { "consul": [], "redis": [], "postgresql": [ "primary", "secondary" ] } ``` The keys are the service names, and the array values provide all known tags for a given service. ## List Nodes for Service This endpoint returns the nodes providing a service in a given datacenter. | Method | Path | Produces | | ------ | ---------------------------- | -------------------------- | | `GET` | `/catalog/service/:service` | `application/json` | The table below shows this endpoint's support for [blocking queries](/api/index.html#blocking-queries), [consistency modes](/api/index.html#consistency-modes), and [required ACLs](/api/index.html#acls). | Blocking Queries | Consistency Modes | ACL Required | | ---------------- | ----------------- | ------------------------ | | `YES` | `all` | `node:read,service:read` | ### Parameters - `service` `(string: )` - Specifies the name of the service for which to list nodes. This is specified as part of the URL. - `dc` `(string: "")` - Specifies the datacenter to query. This will default to the datacenter of the agent being queried. This is specified as part of the URL as a query parameter. - `tag` `(string: "")` - Specifies tags to filter on. - `near` `(string: "")` - Specifies a node name to sort the node list in ascending order based on the estimated round trip time from that node. Passing `?near=_agent` will use the agent's node for the sort. This is specified as part of the URL as a query parameter. - `node-meta` `(string: "")` - Specifies a desired node metadata key/value pair of the form `key:value`. This parameter can be specified multiple times, and will filter the results to nodes with the specified key/value pairs. This is specified as part of the URL as a query parameter. ### Sample Request ```text $ curl \ https://consul.rocks/v1/catalog/service/my-service ``` ### Sample Response ```json [ { "ID": "40e4a748-2192-161a-0510-9bf59fe950b5", "Node": "foobar", "Address": "192.168.10.10", "Datacenter": "dc1", "TaggedAddresses": { "lan": "192.168.10.10", "wan": "10.0.10.10" }, "Meta": { "instance_type": "t2.medium" }, "CreateIndex": 51, "ModifyIndex": 51, "ServiceAddress": "172.17.0.3", "ServiceEnableTagOverride": false, "ServiceID": "32a2a47f7992:nodea:5000", "ServiceName": "foobar", "ServicePort": 5000, "ServiceTags": [ "tacos" ] } ] ``` - `Address` is the IP address of the Consul node on which the service is registered. - `Datacenter` is the data center of the Consul node on which the service is registered. - `TaggedAddresses` is the list of explicit LAN and WAN IP addresses for the agent - `Meta` is a list of user-defined metadata key/value pairs for the node - `CreateIndex` is an internal index value representing when the service was created - `ModifyIndex` is the last index that modified the service - `Node` is the name of the Consul node on which the service is registered - `ServiceAddress` is the IP address of the service host — if empty, node address should be used - `ServiceEnableTagOverride` indicates whether service tags can be overridden on this service - `ServiceID` is a unique service instance identifier - `ServiceName` is the name of the service - `ServicePort` is the port number of the service - `ServiceTags` is a list of tags for the service ## List Services for Node This endpoint returns the node's registered services. | Method | Path | Produces | | ------ | ---------------------------- | -------------------------- | | `GET` | `/catalog/node/:node` | `application/json` | The table below shows this endpoint's support for blocking queries and consistency modes. The table below shows this endpoint's support for [blocking queries](/api/index.html#blocking-queries), [consistency modes](/api/index.html#consistency-modes), and [required ACLs](/api/index.html#acls). | Blocking Queries | Consistency Modes | ACL Required | | ---------------- | ----------------- | ------------------------ | | `YES` | `all` | `node:read,service:read` | ### Parameters - `node` `(string: )` - Specifies the name of the node for which to list services. This is specified as part of the URL. - `dc` `(string: "")` - Specifies the datacenter to query. This will default to the datacenter of the agent being queried. This is specified as part of the URL as a query parameter. ### Sample Request ```text $ curl \ https://consul.rocks/v1/catalog/node/my-node ``` ### Sample Response ```json { "Node": { "ID": "40e4a748-2192-161a-0510-9bf59fe950b5", "Node": "foobar", "Address": "10.1.10.12", "Datacenter": "dc1", "TaggedAddresses": { "lan": "10.1.10.12", "wan": "10.1.10.12" }, "Meta": { "instance_type": "t2.medium" } }, "Services": { "consul": { "ID": "consul", "Service": "consul", "Tags": null, "Port": 8300 }, "redis": { "ID": "redis", "Service": "redis", "Tags": [ "v1" ], "Port": 8000 } } } ```