The Heron API server is a necessary component
If you‘re running Heron locally on your laptop, you won’t need to run the Heron API server separately; its functions will be handled automatically.
The Heron API server executable (heron-apiserver
) is installed automatically when you install the Heron tools.
You can start up the Heron API server using the heron-apiserver
command. When you do so you'll need to specify two things:
Here's an example:
$ heron-apiserver \ --base-template mesos \ --cluster sandbox
The Heron API server works by accepting incoming commands from the Heron CLI tool and interacts with a variety of Heron components, including:
When you install the Heron tools, a directory will automatically be created in ~/.herontools/conf
on MacOS and /usr/local/herontools/conf
on other platforms. That directory contains a number of base templates for all of the currently supported schedulers. Modify the configuration for your scheduler, for example Mesos using the YAML files in the mesos
folder, and then select the proper base template using the --base-template
flag. Here's an example for Mesos:
$ heron-apiserver \ --base-template mesos \ --cluster my-cluster
For a full guide to Heron configuration, see Configuring a cluster.
In addition to specifying a base template when starting up the API server, you also need to specify a name for the cluster that the Heron API server will be serving. Here's an example:
$ heron-apiserver \ --base-template mesos \ --cluster us-west-prod
{{< alert “api-server-cluster-name” >}}
In addition to specifying a base template and cluster name, you can also specify:
Flag | Description |
---|---|
--config-path | A non-default path to a base configuration |
--port | The port to bind to (the default is 9000) |
When you specify a base template when running the Heron API server, the server will use whatever configuration is found in the template files. You can override configuration on a per-parameter basis, however, using the -D
flag. Here's an example:
$ heron-apiserver \ --base-template aurora \ --cluster us-west-prod \ -D heron.statemgr.connection.string=zk-1:2181,zk-2:2181,zk-3:2181 \ -D heron.class.uploader=com.acme.uploaders.MyCustomUploader