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Update HealthInformation reference documentation
Clean and align with changes in Spring Boot 1.2 Fixes gh-2104
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Phillip Webb
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@ -86,8 +86,9 @@ The following endpoints are available:
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|true
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|`health`
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|Shows application health information (defaulting to a simple '`OK`' message).
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|false
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|Shows full application health information when accessed securely or a simple '`status`'
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message when accessed over an insecure HTTP connection.
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|true
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|`info`
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|Displays arbitrary application info.
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@ -137,13 +138,67 @@ that is being configured.
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[[production-ready-health]]
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=== Custom health information
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The default information exposed by the `health` endpoint is a simple '`OK`' message. It
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is often useful to perform some additional health checks, for example you might check
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that a database connection works, or that a remote REST endpoint is functioning.
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=== Health information
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Health information can be used to check the status of your running application. It is
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often used by monitoring software to alert someone if a production system goes down.
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The default information exposed by the `health` endpoint depends on how it is accessed.
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For an insecure unauthenticated connection a simple '`status`' message is returned, for a
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secure or authenticated connection additional details are also displayed (see
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<<production-ready-health-access-restrictions>> for HTTP details).
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To provide custom health information you can register a Spring bean that implements the
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Heath information is collected from all
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{sc-spring-boot-actuator}/health/HealthIndicator.{sc-ext}[`HealthIndicator`] beans defined
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in your `ApplicationContext`. Spring Boot includes a number of auto-configured
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`HealthIndicators` and you can also write your own.
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=== Security with HealthIndicators
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Information returned by `HealthIndicators` is often somewhat sensitive in nature. For
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example and you probably don't want to publish details of your database server to the
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world. For this reason, by default, only the health status is exposed on an insecure HTTP
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connection. If you are happy for complete heath information to always be exposed you can
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set `endpoints.health.sensitive` to `false`.
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Heath responses are also cached to prevent "`denial of service`" attacks. Use the
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`endpoints.health.time-to-live` property if you want to change the default cache period
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of 1000 milliseconds.
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==== Auto-configured HealthIndicators
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The following `HealthIndicators` are auto-configured by Spring Boot when appropriate:
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|===
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|Name |Description
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|{sc-spring-boot-actuator}/health/DiskSpaceHealthIndicator.{sc-ext}[`DiskSpaceHealthIndicator`]
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|Checks for low disk space.
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|{sc-spring-boot-actuator}/health/DataSourceHealthIndicator.{sc-ext}[`DataSourceHealthIndicator`]
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|Checks that a connection to `DataSource` can be obtained.
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|{sc-spring-boot-actuator}/health/MongoHealthIndicator.{sc-ext}[`MongoHealthIndicator`]
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|Checks that a Mongo database is up.
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|{sc-spring-boot-actuator}/health/RabbitHealthIndicator.{sc-ext}[`RabbitHealthIndicator`]
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|Checks that a Rabbit server is up.
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|{sc-spring-boot-actuator}/health/SolrHealthIndicator.{sc-ext}[`RedisHealthIndicator`]
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|Checks that a Redis server is up.
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|{sc-spring-boot-actuator}/health/SolrHealthIndicator.{sc-ext}[`SolrHealthIndicator`]
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|Checks that a Solr server is up.
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|===
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==== Writing custom HealthIndicators
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To provide custom health information you can register Spring beans that implement the
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{sc-spring-boot-actuator}/health/HealthIndicator.{sc-ext}[`HealthIndicator`] interface.
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You need to provide an implementation of the `health()` method and return a `Health`
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response. The `Health` response should include a status and can optionally include
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additional details to be displayed.
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[source,java,indent=0]
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----
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@ -155,30 +210,35 @@ To provide custom health information you can register a Spring bean that impleme
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@Override
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public Health health() {
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// perform some specific health check
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return ...
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int errorCode = check(); // perform some specific health check
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if (errorCode != 0) {
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return Health.down().withDetail("Error Code", errorCode);
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}
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return Health.up();
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}
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}
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----
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Spring Boot provides a
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{sc-spring-boot-actuator}/health/DataSourceHealthIndicator.{sc-ext}[`DataSourceHealthIndicator`]
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implementation that attempts a simple database test (reusing the validation query set on the data
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source, if any) as well as implementations for Redis, MongoDB and RabbitMQ. Spring Boot adds the
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`HealthIndicator` instances automatically if beans of type `DataSource`, `MongoTemplate`,
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`RedisConnectionFactory`, and `RabbitTemplate` respectively are present in the
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`ApplicationContext`. A health indicator that checks free disk space is also provided.
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In addition to Spring Boot's default {sc-spring-boot-actuator}/health/Status.{sc-ext}[`Status`]
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types, it is also possible to introduce custom `Status` types to represent more
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complex system states. In such cases a custom implementation of the
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{sc-spring-boot-actuator}/health/HealthAggregator.{sc-ext}[`HealthAggregator`]
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interface also needs to be provided, or the default implementation has to be configured
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using the `management.health.status.order` configuration property.
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Besides implementing custom a `HealthIndicator` type and using out-of-box {sc-spring-boot-actuator}/health/Status.{sc-ext}[`Status`]
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types, it is also possible to introduce custom `Status` types for different or more complex system
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states. In that case a custom implementation of the {sc-spring-boot-actuator}/health/HealthAggregator.{sc-ext}[`HealthAggregator`]
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interface needs to be provided or the default implementation has to be configured using the
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`management.health.status.order` configuration property.
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For example, assuming a new `Status` with code `FATAL` is being used in one of your
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`HealthIndicator` implementations. To configure the severity order add the following
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to your application properties:
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Assuming a new `Status` with code `FATAL` is being used in one of your `HealthIndicator`
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implementations. To configure the severity or order add the following to your application properties:
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`management.health.status.order: DOWN, OUT_OF_SERVICE, UNKNOWN, UP`.
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[source,properties,indent=0]
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----
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management.health.status.order: DOWN, OUT_OF_SERVICE, UNKNOWN, UP
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----
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You might also want to register custom status mappings with the `HealthMvcEndpoint`
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if you access the health endpoint over HTTP. For example you could map `FATAL` to
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`HttpStatus.SERVICE_UNAVAILABLE`.
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@ -411,7 +471,7 @@ If you don't want to expose endpoints over HTTP you can set the management port
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[[production-ready-health-access-restrictions]]
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=== Health endpoint anonymous access restrictions
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=== HTTP Health endpoint access restrictions
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The information exposed by the health endpoint varies depending on whether or not it's
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accessed anonymously. By default, when accessed anonymously, any details about the
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server's health are hidden and the endpoint will simply indicate whether or not the server
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