No seed node left for cluster clusterAlias – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 8.8-8.9

Briefly, this error occurs when Elasticsearch cannot find any seed nodes to form or join a cluster. Seed nodes are essential for cluster formation as they provide the initial point of contact for other nodes. This could be due to network issues, incorrect configuration, or all seed nodes being down. To resolve this, ensure that your network is functioning properly, check your Elasticsearch configuration for any errors, and verify that at least one seed node is up and running. If necessary, add more seed nodes to your cluster to increase its resilience.

This guide will help you check for common problems that cause the log ” no seed node left for cluster: [” + clusterAlias + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: alias, node, cluster.

Log Context

Log “no seed node left for cluster: [” + clusterAlias + “]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 logger.debug(() -> format("[%s] failed to open managed connection to seed node: [%s]"; clusterAlias; node); e);
 } else {
 listener.onFailure(new NoSeedNodeLeftException("no seed node left for cluster: [" + clusterAlias + "]"));
 }  private ConnectionManager.ConnectionValidator getConnectionValidator(DiscoveryNode node) {
 return (connection; profile; listener) -> {


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