Unable to resolve project from metadata server for GCE discovery service – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch is unable to retrieve project information from the Google Compute Engine (GCE) metadata server for its discovery service. This could be due to network issues, incorrect configuration, or lack of necessary permissions. To resolve this, ensure that your OpenSearch instance has network access to the GCE metadata server. Check your configuration settings for any errors and ensure that the correct project ID is specified. Also, verify that your OpenSearch instance has the necessary permissions to access the GCE metadata server.

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This guide will help you check for common problems that cause the log ” unable to resolve project from metadata server for GCE discovery service ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: discovery-gce, plugins, metadata, discovery.

Log Context

Log “unable to resolve project from metadata server for GCE discovery service” classname is GceInstancesServiceImpl.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        try {
            // this code is based on a private GCE method: {@link com.google.cloud.ServiceOptions#getAppEngineProjectIdFromMetadataServer()}
            return getAppEngineValueFromMetadataServer("/computeMetadata/v1/project/project-id");
        } catch (Exception e) {
            logger.warn("unable to resolve project from metadata server for GCE discovery service"; e);
        return null;

    private List resolveZones() {


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