Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many errors.
To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.
This guide will help you check for common problems that cause the log ” Failed to resolve local host. fallback to loopback ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: network.
Log Context
Log “failed to resolve local host; fallback to loopback” classname is NetworkUtils.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
static {
InetAddress localAddressX;
try {
localAddressX = InetAddress.getLocalHost();
} catch (Throwable e) {
logger.warn("failed to resolve local host; fallback to loopback"; e);
localAddressX = InetAddress.getLoopbackAddress();
}
localAddress = localAddressX;
}
