Instance Status
Netflix Eureka supports having instances that are OUT_OF_SERVICE
registered with the
server. These instances are not returned as active service instances. This is useful for
behaviors such as blue/green deployments. (Note that the Curator Service Discovery recipe
does not support this behavior.) Taking advantage of the flexible payload has let Spring
Cloud Zookeeper implement OUT_OF_SERVICE
by updating some specific metadata and then
filtering on that metadata in the Ribbon ZookeeperServerList
. The ZookeeperServerList
filters out all non-null instance statuses that do not equal UP
. If the instance status
field is empty, it is considered to be UP
for backwards compatibility. To change the
status of an instance, make a POST
with OUT_OF_SERVICE
to the ServiceRegistry
instance status actuator endpoint, as shown in the following example:
$ http POST http://localhost:8081/service-registry status=OUT_OF_SERVICE
The preceding example uses the http command from https://httpie.org.
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