open-consul/website/content/api-docs/health.mdx

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---
layout: api
page_title: Health - HTTP API
description: |-
The /health endpoints query health-related information for services and checks
in Consul.
---
# Health HTTP Endpoint
The `/health` endpoints query health-related information. They are provided
separately from the `/catalog` endpoints since users may prefer not to use the
optional health checking mechanisms. Additionally, some of the query results
from the health endpoints are filtered while the catalog endpoints provide the
raw entries.
## List Checks for Node
This endpoint returns the checks specific to the node provided on the path.
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| Method | Path | Produces |
| ------ | -------------------- | ------------------ |
| `GET` | `/health/node/:node` | `application/json` |
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The table below shows this endpoint's support for
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[blocking queries](/api/features/blocking),
[consistency modes](/api/features/consistency),
[agent caching](/api/features/caching), and
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[required ACLs](/api#authentication).
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| Blocking Queries | Consistency Modes | Agent Caching | ACL Required |
| ---------------- | ----------------- | ------------- | ------------------------ |
| `YES` | `all` | `none` | `node:read,service:read` |
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### Parameters
- `node` `(string: <required>)` - Specifies the name or ID of the node to query.
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.
- `filter` `(string: "")` - Specifies the expression used to filter the
queries results prior to returning the data.
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- `ns` `(string: "")` <EnterpriseAlert inline /> - Specifies the namespace to list checks.
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This value may be provided by either the `ns` URL query parameter or in the
`X-Consul-Namespace` header. If not provided, the namespace will be inherited
from the request's ACL token or will default to the `default` namespace. To view
checks for multiple namespaces the `*` wildcard namespace may be used. Added in Consul 1.7.0.
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### Sample Request
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```shell-session
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$ curl \
--header "X-Consul-Namespace: *" \
http://127.0.0.1:8500/v1/health/node/my-node
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```
### Sample Response
```json
[
{
"ID": "40e4a748-2192-161a-0510-9bf59fe950b5",
"Node": "foobar",
"CheckID": "serfHealth",
"Name": "Serf Health Status",
"Status": "passing",
"Notes": "",
"Output": "",
"ServiceID": "",
"ServiceName": "",
"ServiceTags": [],
"Namespace": "default"
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},
{
"ID": "40e4a748-2192-161a-0510-9bf59fe950b5",
"Node": "foobar",
"CheckID": "service:redis",
"Name": "Service 'redis' check",
"Status": "passing",
"Notes": "",
"Output": "",
"ServiceID": "redis",
"ServiceName": "redis",
"ServiceTags": ["primary"],
"Namespace": "foo"
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}
]
```
### Filtering
The filter will be executed against each health check in the results list with
the following selectors and filter operations being supported:
| Selector | Supported Operations |
| ------------- | -------------------------------------------------- |
| `CheckID` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Name` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Node` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Notes` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Output` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `ServiceID` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `ServiceName` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `ServiceTags` | In, Not In, Is Empty, Is Not Empty |
| `Status` | Equal, Not Equal, In, Not In, Matches, Not Matches |
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## List Checks for Service
This endpoint returns the checks associated with the service provided on the
path.
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| Method | Path | Produces |
| ------ | ------------------------- | ------------------ |
| `GET` | `/health/checks/:service` | `application/json` |
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The table below shows this endpoint's support for
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[blocking queries](/api/features/blocking),
[consistency modes](/api/features/consistency),
[agent caching](/api/features/caching), and
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[required ACLs](/api#authentication).
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| Blocking Queries | Consistency Modes | Agent Caching | ACL Required |
| ---------------- | ----------------- | ------------- | ------------------------ |
| `YES` | `all` | `none` | `node:read,service:read` |
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### Parameters
- `service` `(string: <required>)` - Specifies the service to list checks for.
This is provided 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.
- `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
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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.
- `filter` `(string: "")` - Specifies the expression used to filter the
queries results prior to returning the data.
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- `ns` `(string: "")` <EnterpriseAlert inline /> - Specifies the namespace of the service.
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This value may be provided by either the `ns` URL query parameter or in the
`X-Consul-Namespace` header. If not provided, the namespace will be inherited
from the request's ACL token or will default to the `default` namespace. Added in Consul 1.7.0.
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### Sample Request
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```shell-session
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$ curl \
http://127.0.0.1:8500/v1/health/checks/my-service?ns=default
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```
### Sample Response
```json
[
{
"Node": "foobar",
"CheckID": "service:redis",
"Name": "Service 'redis' check",
"Status": "passing",
"Notes": "",
"Output": "",
"ServiceID": "redis",
"ServiceName": "redis",
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"ServiceTags": ["primary"],
"Namespace": "default"
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}
]
```
### Filtering
The filter will be executed against each health check in the results list with
the following selectors and filter operations being supported:
| Selector | Supported Operations |
| ------------- | -------------------------------------------------- |
| `CheckID` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Name` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Node` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Notes` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Output` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `ServiceID` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `ServiceName` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `ServiceTags` | In, Not In, Is Empty, Is Not Empty |
| `Status` | Equal, Not Equal, In, Not In, Matches, Not Matches |
## List Service Instances for Service ((#list-nodes-for-service))
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This endpoint returns the service instances providing the service indicated on the path.
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Users can also build in support for dynamic load balancing and other features by
incorporating the use of health checks.
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| Method | Path | Produces |
| ------ | -------------------------- | ------------------ |
| `GET` | `/health/service/:service` | `application/json` |
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The table below shows this endpoint's support for
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[blocking queries](/api/features/blocking),
[consistency modes](/api/features/consistency),
[agent caching](/api/features/caching), and
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[required ACLs](/api#authentication).
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| Blocking Queries | Consistency Modes | Agent Caching | ACL Required |
| -------------------- | ----------------- | -------------------- | ------------------------ |
| `YES` <sup>1</sup> | `all` | `background refresh` | `node:read,service:read` |
<p>
<sup>1</sup>some query parameters will use the
<a href="/api/features/blocking#streaming-backend">streaming backend</a>
</p>
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### Parameters
- `service` `(string: <required>)` - Specifies the service to list services for.
This is provided 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.
- `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. **Note** that using `near` will ignore
[`use_streaming_backend`](/docs/agent/options#use_streaming_backend) and always
use blocking queries, because the data required to sort the results is not available
to the streaming backend.
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- `tag` `(string: "")` **Deprecated** - Use `filter` with the `Service.Tags` selector instead.
This parameter will be removed in a future version of Consul.
Specifies the tag to filter the list. This is
specified as part of the URL as a query parameter. Can be used multiple times
for additional filtering, returning only the results that include all of the tag
New ACLs (#4791) This PR is almost a complete rewrite of the ACL system within Consul. It brings the features more in line with other HashiCorp products. Obviously there is quite a bit left to do here but most of it is related docs, testing and finishing the last few commands in the CLI. I will update the PR description and check off the todos as I finish them over the next few days/week. Description At a high level this PR is mainly to split ACL tokens from Policies and to split the concepts of Authorization from Identities. A lot of this PR is mostly just to support CRUD operations on ACLTokens and ACLPolicies. These in and of themselves are not particularly interesting. The bigger conceptual changes are in how tokens get resolved, how backwards compatibility is handled and the separation of policy from identity which could lead the way to allowing for alternative identity providers. On the surface and with a new cluster the ACL system will look very similar to that of Nomads. Both have tokens and policies. Both have local tokens. The ACL management APIs for both are very similar. I even ripped off Nomad's ACL bootstrap resetting procedure. There are a few key differences though. Nomad requires token and policy replication where Consul only requires policy replication with token replication being opt-in. In Consul local tokens only work with token replication being enabled though. All policies in Nomad are globally applicable. In Consul all policies are stored and replicated globally but can be scoped to a subset of the datacenters. This allows for more granular access management. Unlike Nomad, Consul has legacy baggage in the form of the original ACL system. The ramifications of this are: A server running the new system must still support other clients using the legacy system. A client running the new system must be able to use the legacy RPCs when the servers in its datacenter are running the legacy system. The primary ACL DC's servers running in legacy mode needs to be a gate that keeps everything else in the entire multi-DC cluster running in legacy mode. So not only does this PR implement the new ACL system but has a legacy mode built in for when the cluster isn't ready for new ACLs. Also detecting that new ACLs can be used is automatic and requires no configuration on the part of administrators. This process is detailed more in the "Transitioning from Legacy to New ACL Mode" section below.
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values provided.
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- `node-meta` `(string: "")` **Deprecated** - Use `filter` with the `Node.Meta` selector instead.
This parameter will be removed in a future version of Consul.
Specifies a desired node metadata key/value pair
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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.
- `passing` `(bool: false)` - Specifies that the server should return only nodes
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with all checks in the `passing` state. This can be used to avoid additional
filtering on the client side.
- `filter` `(string: "")` - Specifies the expression used to filter the
queries results prior to returning the data.
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- `ns` `(string: "")` <EnterpriseAlert inline /> - Specifies the namespace of the service.
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This value may be provided by either the `ns` URL query parameter or in the
`X-Consul-Namespace` header. If not provided, the namespace will be inherited
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from the request's ACL token or will default to the `default` namespace. Added in Consul 1.7.0.
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### Sample Request
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```shell-session
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$ curl \
http://127.0.0.1:8500/v1/health/service/my-service?ns=default
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```
### Sample Response
```json
[
{
"Node": {
"ID": "40e4a748-2192-161a-0510-9bf59fe950b5",
"Node": "foobar",
"Address": "10.1.10.12",
"Datacenter": "dc1",
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"TaggedAddresses": {
"lan": "10.1.10.12",
"wan": "10.1.10.12"
},
"Meta": {
"instance_type": "t2.medium"
}
},
"Service": {
"ID": "redis",
"Service": "redis",
"Tags": ["primary"],
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"Address": "10.1.10.12",
"TaggedAddresses": {
"lan": {
"address": "10.1.10.12",
"port": 8000
},
"wan": {
"address": "198.18.1.2",
"port": 80
}
},
"Meta": {
"redis_version": "4.0"
},
"Port": 8000,
"Weights": {
"Passing": 10,
"Warning": 1
},
"Namespace": "default"
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},
"Checks": [
{
"Node": "foobar",
"CheckID": "service:redis",
"Name": "Service 'redis' check",
"Status": "passing",
"Notes": "",
"Output": "",
"ServiceID": "redis",
"ServiceName": "redis",
"ServiceTags": ["primary"],
"Namespace": "default"
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},
{
"Node": "foobar",
"CheckID": "serfHealth",
"Name": "Serf Health Status",
"Status": "passing",
"Notes": "",
"Output": "",
"ServiceID": "",
"ServiceName": "",
"ServiceTags": [],
"Namespace": "default"
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}
]
}
]
```
### Filtering
The filter will be executed against each entry in the top level results list with the
following selectors and filter operations being supported:
| Selector | Supported Operations |
| ----------------------------------------------------- | -------------------------------------------------- |
| `Checks` | Is Empty, Is Not Empty |
| `Checks.CheckID` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Checks.Name` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Checks.Node` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Checks.Notes` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Checks.Output` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Checks.ServiceID` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Checks.ServiceName` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Checks.ServiceTags` | In, Not In, Is Empty, Is Not Empty |
| `Checks.Status` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Node.Address` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Node.Datacenter` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Node.ID` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Node.Meta` | Is Empty, Is Not Empty, In, Not In |
| `Node.Meta.<any>` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Node.Node` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Node.TaggedAddresses` | Is Empty, Is Not Empty, In, Not In |
| `Node.TaggedAddresses.<any>` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Service.Address` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Service.Connect.Native` | Equal, Not Equal |
| `Service.EnableTagOverride` | Equal, Not Equal |
| `Service.ID` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Service.Kind` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Service.Meta` | Is Empty, Is Not Empty, In, Not In |
| `Service.Meta.<any>` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Service.Port` | Equal, Not Equal |
| `Service.Proxy.DestinationServiceID` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Service.Proxy.DestinationServiceName` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Service.Proxy.LocalServiceAddress` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Service.Proxy.LocalServicePort` | Equal, Not Equal |
| `Service.Proxy.Mode` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Service.Proxy.TransparentProxy.OutboundListenerPort` | Equal, Not Equal |
| `Service.Proxy.MeshGateway.Mode` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Service.Proxy.Upstreams` | Is Empty, Is Not Empty |
| `Service.Proxy.Upstreams.Datacenter` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Service.Proxy.Upstreams.DestinationName` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Service.Proxy.Upstreams.DestinationNamespace` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Service.Proxy.Upstreams.DestinationType` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Service.Proxy.Upstreams.LocalBindAddress` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Service.Proxy.Upstreams.LocalBindPort` | Equal, Not Equal |
| `Service.Proxy.Upstreams.MeshGateway.Mode` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Service.Service` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Service.TaggedAddresses` | Is Empty, Is Not Empty, In, Not In |
| `Service.TaggedAddresses.<any>.Address` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Service.TaggedAddresses.<any>.Port` | Equal, Not Equal |
| `Service.Tags` | In, Not In, Is Empty, Is Not Empty |
| `Service.Weights.Passing` | Equal, Not Equal |
| `Service.Weights.Warning` | Equal, Not Equal |
## List Service Instances for Connect-enabled Service
This endpoint returns the service instances providing a
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[Connect-capable](/docs/connect) service in a given datacenter.
This will include both proxies and native integrations. A service may
register both Connect-capable and incapable services at the same time,
so this endpoint may be used to filter only the Connect-capable endpoints.
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| Method | Path | Produces |
| ------ | -------------------------- | ------------------ |
| `GET` | `/health/connect/:service` | `application/json` |
Parameters and response format are the same as
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[`/health/service/:service`](/api/health#list-nodes-for-service).
## List Service Instances for Ingress Gateways Associated with a Service
-> **1.8.0+:** This API is available in Consul versions 1.8.0 and later.
This endpoint returns the service instances providing an [ingress
gateway](/docs/connect/gateways/ingress-gateway) for a service in a given datacenter.
| Method | Path | Produces |
| ------ | -------------------------- | ------------------ |
| `GET` | `/health/ingress/:service` | `application/json` |
Parameters and response format are the same as
[`/health/service/:service`](/api/health#list-nodes-for-service).
**Note** that unlike `/health/connect/:service` and `/health/service/:service` this
endpoint does not support the [streaming backend](/api/features/blocking#streaming-backend).
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## List Checks in State
This endpoint returns the checks in the state provided on the path.
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| Method | Path | Produces |
| ------ | ---------------------- | ------------------ |
| `GET` | `/health/state/:state` | `application/json` |
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The table below shows this endpoint's support for
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[blocking queries](/api/features/blocking),
[consistency modes](/api/features/consistency),
[agent caching](/api/features/caching), and
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[required ACLs](/api#authentication).
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| Blocking Queries | Consistency Modes | Agent Caching | ACL Required |
| ---------------- | ----------------- | ------------- | ------------------------ |
| `YES` | `all` | `none` | `node:read,service:read` |
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### Parameters
- `state` `(string: <required>)` - Specifies the state to query. Supported states
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are `any`, `passing`, `warning`, or `critical`. The `any` state is a wildcard
that can be used to return all checks.
- `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.
- `filter` `(string: "")` - Specifies the expression used to filter the
queries results prior to returning the data.
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- `ns` `(string: "")` <EnterpriseAlert inline /> - Specifies the namespace to query.
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This value may be provided by either the `ns` URL query parameter or in the
`X-Consul-Namespace` header. If not provided, the namespace will be inherited
from the request's ACL token or will default to the `default` namespace. Added in Consul 1.7.0.
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### Sample Request
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```shell-session
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$ curl \
http://127.0.0.1:8500/v1/health/state/passing?ns=default
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```
### Sample Response
```json
[
{
"Node": "foobar",
"CheckID": "serfHealth",
"Name": "Serf Health Status",
"Status": "passing",
"Notes": "",
"Output": "",
"ServiceID": "",
"ServiceName": "",
"ServiceTags": [],
"Namespace": "default"
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},
{
"Node": "foobar",
"CheckID": "service:redis",
"Name": "Service 'redis' check",
"Status": "passing",
"Notes": "",
"Output": "",
"ServiceID": "redis",
"ServiceName": "redis",
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"ServiceTags": ["primary"],
"Namespace": "default"
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}
]
```
### Filtering
The filter will be executed against each health check in the results list with
the following selectors and filter operations being supported:
| Selector | Supported Operations |
| ------------- | -------------------------------------------------- |
| `CheckID` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Name` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Node` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Notes` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `Output` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `ServiceID` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `ServiceName` | Equal, Not Equal, In, Not In, Matches, Not Matches |
| `ServiceTags` | In, Not In, Is Empty, Is Not Empty |
| `Status` | Equal, Not Equal, In, Not In, Matches, Not Matches |