Where to configure systems settings depends on which package you have used to install Elasticsearch, and which operating system you are using.
When using the
.tar.gz packages, system settings can be configured:
When using the RPM or Debian packages, most system settings are set in the system configuration file. However, systems which use systemd require that system limits are specified in a systemd configuration file.
On Linux systems,
ulimit can be used to change resource limits on a
temporary basis. Limits usually need to be set as
root before switching to
the user that will run Elasticsearch. For example, to set the number of
open file handles (
ulimit -n) to 65,536, you can do the following:
Change the max number of open files.
The new limit is only applied during the current session.
You can consult all currently applied limits with
On Linux systems, persistent limits can be set for a particular user by
/etc/security/limits.conf file. To set the maximum number of
open files for the
elasticsearch user to 65,535, add the following line to
elasticsearch - nofile 65535
This change will only take effect the next time the
elasticsearch user opens
a new session.
Ubuntu ignores the
limits.conf file for processes started by
limits.conf file, edit
/etc/pam.d/su and uncomment the
# session required pam_limits.so
When using the RPM or Debian packages, environment variables can be specified in the system configuration file, which is located in:
However, system limits need to be specified via systemd.
When using the RPM or Debian packages on systems that use systemd, system limits must be specified via systemd.
The systemd service file (
contains the limits that are applied by default.
To override them, add a file called
you may run
sudo systemctl edit elasticsearch which opens the file
automatically inside your default editor). Set any changes in this file,
Once finished, run the following command to reload units:
sudo systemctl daemon-reload