Failed to lock node s directory – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.5

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Briefly, this error occurs when Elasticsearch is unable to lock the data directory of a node, usually due to another instance of Elasticsearch already running on the same directory. This can also happen if the directory is read-only or the user running Elasticsearch doesn’t have the necessary permissions. To resolve this issue, ensure that no other Elasticsearch instances are running on the same directory. If that’s not the case, check the directory’s permissions and make sure the user running Elasticsearch has write access to it.

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This guide will help you check for common problems that cause the log ” Failed to lock node’s directory [ ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: shard, index.

Log Context

Log “Failed to lock node’s directory [” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 } catch (LockObtainFailedException lofe) {
 throw new ElasticsearchException("Failed to lock node's directory [" + lofe.getMessage()
 + "]; is Elasticsearch still running ?");
 throw new ElasticsearchException("Unable to resolve shard path for index [" + indexName + "] and shard id [" + shardId + "]");


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