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Etcd-Based Discovery Provider

Revision as of 16:56, 17 December 2017 by Slewis.composent.com (Talk | contribs)

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As per enhancement request 440824, recently a new ECF discovery provider has been created, based upon the etcd server/service. See the etcd github project here for specifics about the etcd project.

Getting and Etcd Discovery Provider

The ECF Etcd Discovery Provider is currently available as one of ECF's github repositories. The etcd provider repository is here.

A binary build of the Etcd Discovery Provider is available here

Etcd Discovery Provider Configuration Properties

As with other discovery providers, the ECF Etcd Discovery Provider is configured properties. Here is a table of the Etcd Discovery Provider configuration properties and their default values:

Property Name Description Type Default value
ecf.discovery.etcd.protocol Etcd Server URL protocol. Example: 'http' in constructed Etcd Server URL 'http://127.0.0.1:2379/v2/keys' String http
ecf.discovery.etcd.hostname Etcd Server URL hostname. Example: '127.0.0.1' in constructed Etcd Server URL 'http://127.0.0.1:2379/v2/keys' String None. Note that this system property is required and must be set to an operational etcd host.
ecf.discovery.etcd.port Etcd Server URL port. Example: '2379' in constructed Etcd Server URL 'http://127.0.0.1:2379/v2/keys' String 2379
ecf.discovery.etcd.path Etcd Server URL initial path. Example: '/v2/keys' in constructed Etcd Server URL 'http://127.0.0.1:2379/v2/keys' String /v2/keys
ecf.discovery.etcd.targetid Etcd Server target. Example: 'http://foo.bar:2379/v2/keys' in 'http://foo.bar:2379/v2/keys'. Note that

if set, the value provided by this property will override the protocol, hostname, port, and path specified by the properties defined above.

String null/no value resulting in the protocol, hostname, port, and path properties used to construct the etcd service URL
ecf.discovery.etcd.sessionid Etcd Client Container SessionId. This is typically an automatically-generiated UUID String value...e.g.: de1326d9-1ac6-431f-8ae1-9c0e31294047. If this property is set String null/no value resulting in a new UUID being created and assigned as the Etcd Client Container SessionId.
ecf.discovery.etcd.sessionTTL Etcd Client Container SessionId Time To Live (TTL). This is the time to live in seconds for the directory associated with the ectd-provider client. The default behavior of the etcd-provider is to update the time to live when ~75% of the seconds in the TTL have expired. If the ectd-provider gets disconnected from the etcd provider, any published services will remain available for =< TTL. Integer 30 seconds
ecf.discovery.etcd.containerId Etcd Client Container Id. This is the id that is shared for all etc-provider clients The default is 'org.eclipse.ecf.provider.etcd.EtcdDiscoveryContainer' which means that all etcd-provider subscriptions are available at the following path: http://127.0.0.1:2379/v2/keys/org.eclipse.ecf.provider.etcd.EtcdDiscoveryContainer/ String org.eclipse.ecf.provider.etcd.EtcdDiscoveryContainer

Note that these values and defaults are also defined in the source code in the org.eclipse.ecf.provider.etcd.EtcdDiscoveryContainerConfig class available at githhub here.

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