Elasticsearch requires very little configuration to get started, but there are a number of items which must be considered before using your cluster in production:
Our Elastic Cloud service configures these items automatically, making your cluster production-ready by default.
Elasticsearch writes the data you index to indices and data streams to a
directory. Elasticsearch writes its own application logs, which contain information about
cluster health and operations, to a
In production, we strongly recommend you set the
elasticsearch.yml to locations outside of
path.logs values vary by platform:
Linux and macOS installations support Unix-style paths:
path: data: /var/data/elasticsearch logs: /var/log/elasticsearch
Windows installations support DOS paths with escaped backslashes:
path: data: "C:\\Elastic\\Elasticsearch\\data" logs: "C:\\Elastic\\Elasticsearch\\logs"
If needed, you can specify multiple paths in
path.data. Elasticsearch stores the node’s
data across all provided paths but keeps each shard’s data on the same path.
Elasticsearch does not balance shards across a node’s data paths. High disk usage in a single path can trigger a high disk usage watermark for the entire node. If triggered, Elasticsearch will not add shards to the node, even if the node’s other paths have available disk space. If you need additional disk space, we recommend you add a new node rather than additional data paths.
Linux and macOS installations support multiple Unix-style paths in
path: data: - /mnt/elasticsearch_1 - /mnt/elasticsearch_2 - /mnt/elasticsearch_3
Windows installations support multiple DOS paths in
path: data: - "C:\\Elastic\\Elasticsearch_1" - "E:\\Elastic\\Elasticsearch_1" - "F:\\Elastic\\Elasticsearch_3"
Cluster name settingedit
A node can only join a cluster when it shares its
cluster.name with all the
other nodes in the cluster. The default name is
elasticsearch, but you should
change it to an appropriate name that describes the purpose of the cluster.
Do not reuse the same cluster names in different environments. Otherwise, nodes might join the wrong cluster.
Node name settingedit
node.name as a human-readable identifier for a
particular instance of Elasticsearch. This name is included in the response
of many APIs. The node name defaults to the hostname of the machine when
Elasticsearch starts, but can be configured explicitly in
Network host settingedit
By default, Elasticsearch only binds to loopback addresses such as
[::1]. This is sufficient to run a cluster of one or more nodes on a single
server for development and testing, but a
resilient production cluster must involve
nodes on other servers. There are many network settings but
usually all you need to configure is
When you provide a value for
network.host, Elasticsearch assumes that you
are moving from development mode to production mode, and upgrades a number of
system startup checks from warnings to exceptions. See the differences between
development and production modes.
Discovery and cluster formation settingsedit
Configure two important discovery and cluster formation settings before going to production so that nodes in the cluster can discover each other and elect a master node.
Out of the box, without any network configuration, Elasticsearch will bind to
the available loopback addresses and scan local ports
connect with other nodes running on the same server. This behavior provides an
auto-clustering experience without having to do any configuration.
When you want to form a cluster with nodes on other hosts, use the
discovery.seed_hosts setting. This setting
provides a list of other nodes in the cluster
that are master-eligible and likely to be live and contactable to seed
the discovery process. This setting
accepts a YAML sequence or array of the addresses of all the master-eligible
nodes in the cluster. Each address can be either an IP address or a hostname
that resolves to one or more IP addresses via DNS.
The port is optional and defaults to
If a hostname resolves to multiple IP addresses, the node will attempt to discover other nodes at all resolved addresses.
IPv6 addresses must be enclosed in square brackets.
If your master-eligible nodes do not have fixed names or addresses, use an alternative hosts provider to find their addresses dynamically.
When you start an Elasticsearch cluster for the first time, a cluster bootstrapping step determines the set of master-eligible nodes whose votes are counted in the first election. In development mode, with no discovery settings configured, this step is performed automatically by the nodes themselves.
Because auto-bootstrapping is inherently
unsafe, when starting a new cluster in production
mode, you must explicitly list the master-eligible nodes whose votes should be
counted in the very first election. You set this list using the
After the cluster forms successfully for the first time, remove the
cluster.initial_master_nodes setting from each nodes'
configuration. Do not use this setting when
restarting a cluster or adding a new node to an existing cluster.
Identify the initial master nodes by their
Heap size settingsedit
By default, Elasticsearch automatically sets the JVM heap size based on a node’s roles and total memory. We recommend the default sizing for most production environments.
Automatic heap sizing requires the bundled JDK or, if using a custom JRE location, a Java 14 or later JRE.
If needed, you can override the default sizing by manually setting the JVM heap size.
JVM heap dump path settingedit
By default, Elasticsearch configures the JVM to dump the heap on out of
memory exceptions to the default data directory. On RPM and
Debian packages, the data directory is
Linux and MacOS and Windows distributions,
data directory is located under the root of the Elasticsearch installation.
If this path is not suitable for receiving heap dumps, modify the
-XX:HeapDumpPath=... entry in
- If you specify a directory, the JVM will generate a filename for the heap dump based on the PID of the running instance.
- If you specify a fixed filename instead of a directory, the file must not exist when the JVM needs to perform a heap dump on an out of memory exception. Otherwise, the heap dump will fail.
GC logging settingsedit
By default, Elasticsearch enables garbage collection (GC) logs. These are configured in
jvm.options and output to the same default location as
the Elasticsearch logs. The default configuration rotates the logs every 64 MB and
can consume up to 2 GB of disk space.
You can reconfigure JVM logging using the command line options described in
JEP 158: Unified JVM Logging. Unless you
change the default
jvm.options file directly, the Elasticsearch default
configuration is applied in addition to your own settings. To disable the
default configuration, first disable logging by supplying the
-Xlog:disable option, then supply your own command line options. This
disables all JVM logging, so be sure to review the available options
and enable everything that you require.
To see further options not contained in the original JEP, see Enable Logging with the JVM Unified Logging Framework.
Change the default GC log output location to
$ES_HOME/config/jvm.options.d/gc.options with some sample
# Turn off all previous logging configuratons -Xlog:disable # Default settings from JEP 158, but with `utctime` instead of `uptime` to match the next line -Xlog:all=warning:stderr:utctime,level,tags # Enable GC logging to a custom location with a variety of options -Xlog:gc*,gc+age=trace,safepoint:file=/opt/my-app/gc.log:utctime,pid,tags:filecount=32,filesize=64m
Configure an Elasticsearch Docker container to send GC debug logs to
standard error (
stderr). This lets the container orchestrator
handle the output. If using the
ES_JAVA_OPTS environment variable,
MY_OPTS="-Xlog:disable -Xlog:all=warning:stderr:utctime,level,tags -Xlog:gc=debug:stderr:utctime" docker run -e ES_JAVA_OPTS="$MY_OPTS" # etc
Temporary directory settingsedit
By default, Elasticsearch uses a private temporary directory that the startup script creates immediately below the system temporary directory.
On some Linux distributions, a system utility will clean files and directories
/tmp if they have not been recently accessed. This behavior can lead to
the private temporary directory being removed while Elasticsearch is running if
features that require the temporary directory are not used for a long time.
Removing the private temporary directory causes problems if a feature that
requires this directory is subsequently used.
If you install Elasticsearch using the
.rpm packages and run it
systemd, the private temporary directory that Elasticsearch uses
is excluded from periodic cleanup.
If you intend to run the
.tar.gz distribution on Linux or MacOS for
an extended period, consider creating a dedicated temporary
directory for Elasticsearch that is not under a path that will have old files
and directories cleaned from it. This directory should have permissions set
so that only the user that Elasticsearch runs as can access it. Then, set the
$ES_TMPDIR environment variable to point to this directory before starting
JVM fatal error log settingedit
By default, Elasticsearch configures the JVM to write fatal error logs
to the default logging directory. On RPM and Debian packages,
this directory is
/var/log/elasticsearch. On Linux and MacOS and Windows distributions, the
directory is located under the root of the Elasticsearch installation.
These are logs produced by the JVM when it encounters a fatal error, such as a
segmentation fault. If this path is not suitable for receiving logs,
-XX:ErrorFile=... entry in
The only reliable and supported way to back up a cluster is by taking a snapshot. You cannot back up an Elasticsearch cluster by making copies of the data directories of its nodes. There are no supported methods to restore any data from a filesystem-level backup. If you try to restore a cluster from such a backup, it may fail with reports of corruption or missing files or other data inconsistencies, or it may appear to have succeeded having silently lost some of your data.