110 lines
3.4 KiB
Plaintext
110 lines
3.4 KiB
Plaintext
[[setting-system-settings]]
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=== Configuring system settings
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Where to configure systems settings depends on which package you have used to
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install Elasticsearch, and which operating system you are using.
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When using the `.zip` or `.tar.gz` packages, system settings can be configured:
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* temporarily with <<ulimit,`ulimit`>>, or
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* permanently in <<limits.conf,`/etc/security/limits.conf`>>.
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When using the RPM or Debian packages, most system settings are set in the
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<<sysconfig,system configuration file>>. However, systems which use systemd
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require that system limits are specified in a
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<<systemd,systemd configuration file>>.
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[[ulimit]]
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==== `ulimit`
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On Linux systems, `ulimit` can be used to change resource limits on a
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temporary basis. Limits usually need to be set as `root` before switching to
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the user that will run Elasticsearch. For example, to set the number of
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open file handles (`ulimit -n`) to 65,536, you can do the following:
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[source,sh]
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--------------------------------
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sudo su <1>
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ulimit -n 65536 <2>
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su elasticsearch <3>
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--------------------------------
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<1> Become `root`.
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<2> Change the max number of open files.
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<3> Become the `elasticsearch` user in order to start Elasticsearch.
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The new limit is only applied during the current session.
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You can consult all currently applied limits with `ulimit -a`.
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[[limits.conf]]
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==== `/etc/security/limits.conf`
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On Linux systems, persistent limits can be set for a particular user by
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editing the `/etc/security/limits.conf` file. To set the maximum number of
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open files for the `elasticsearch` user to 65,536, add the following line to
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the `limits.conf` file:
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[source,sh]
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--------------------------------
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elasticsearch - nofile 65536
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--------------------------------
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This change will only take effect the next time the `elasticsearch` user opens
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a new session.
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[NOTE]
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.Ubuntu and `limits.conf`
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===============================
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Ubuntu ignores the `limits.conf` file for processes started by `init.d`. To
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enable the `limits.conf` file, edit `/etc/pam.d/su` and uncomment the
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following line:
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[source,sh]
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--------------------------------
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# session required pam_limits.so
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--------------------------------
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===============================
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[[sysconfig]]
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==== Sysconfig file
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When using the RPM or Debian packages, system settings and environment
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variables can be specified in the system configuration file, which is located
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in:
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[horizontal]
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RPM:: `/etc/sysconfig/elasticsearch`
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Debian:: `/etc/default/elasticsearch`
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However, for systems which uses `systemd`, system limits need to be specified
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via <<systemd,systemd>>.
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[[systemd]]
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==== Systemd configuration
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When using the RPM or Debian packages on systems that use
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https://en.wikipedia.org/wiki/Systemd[systemd], system limits must be
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specified via systemd.
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The systemd service file (`/usr/lib/systemd/system/elasticsearch.service`)
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contains the limits that are applied by default.
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To override them, add a file called
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`/etc/systemd/system/elasticsearch.service.d/override.conf` (alternatively,
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you may run `sudo systemctl edit elasticsearch` which opens the file
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automatically inside your default editor). Set any changes in this file,
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such as:
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[source,sh]
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---------------------------------
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[Service]
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LimitMEMLOCK=infinity
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---------------------------------
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Once finished, run the following command to reload units:
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[source,sh]
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---------------------------------
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sudo systemctl daemon-reload
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---------------------------------
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