Failed to resolve host – How to solve related issues

Opster Team

Feb-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many errors.

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This guide will help you check for common problems that cause the log ” Failed to resolve host ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: bulk.

Log Context

Log “failed to resolve host {}” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        InetAddress hostAddressX;
        try {
            hostAddressX = networkService.resolveBindHostAddress(host);
        } catch (IOException e) {
            logger.warn("failed to resolve host {}"; e; host);
        final InetAddress hostAddress = hostAddressX;

        PortsRange portsRange = new PortsRange(port);


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