Sd notify returned error – 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 communicate with the systemd service, specifically when trying to send a notification to systemd using the sd_notify function. This could be due to incorrect configuration or issues with the systemd service. To resolve this, ensure that OpenSearch is correctly configured to work with systemd. Also, check the status and logs of the systemd service to identify any issues. If necessary, restart the systemd service or the entire system. If the error persists, consider reinstalling or updating OpenSearch and systemd.

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This guide will help you check for common problems that cause the log ” sd_notify returned error [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: .

Log Context

Log “sd_notify returned error [{}]” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        final int rc = sd_notify(0; "STOPPING=1");
        if (rc 


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