[[deb]]
=== Install Elasticsearch with Debian Package

The Debian package for Elasticsearch can be <<install-deb,downloaded from our website>>
or from our  <<deb-repo,APT repository>>. It can be used to install
Elasticsearch on any Debian-based system such as Debian and Ubuntu.

The latest stable version of Elasticsearch can be found on the
link:/downloads/elasticsearch[Download Elasticsearch] page. Other versions can
be found on the link:/downloads/past-releases[Past Releases page].

NOTE: Elasticsearch requires Java 8 or later. Use the
http://www.oracle.com/technetwork/java/javase/downloads/index.html[official Oracle distribution]
or an open-source distribution such as http://openjdk.java.net[OpenJDK].

[[deb-key]]
==== Import the Elasticsearch PGP Key

include::key.asciidoc[]

[source,sh]
-------------------------
wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo apt-key add -
-------------------------

[[deb-repo]]
==== Installing from the APT repository

ifeval::["{release-state}"=="unreleased"]

Version {version} of Elasticsearch has not yet been released.

endif::[]

ifeval::["{release-state}"!="unreleased"]

You may need to install the `apt-transport-https` package on Debian before proceeding:

[source,sh]
--------------------------------------------------
sudo apt-get install apt-transport-https
--------------------------------------------------

Save the repository definition to  +/etc/apt/sources.list.d/elastic-{major-version}.list+:

ifeval::["{release-state}"=="released"]

["source","sh",subs="attributes,callouts"]
--------------------------------------------------
echo "deb https://artifacts.elastic.co/packages/{major-version}-prerelease/apt stable main" | sudo tee -a /etc/apt/sources.list.d/elastic-{major-version}.list
--------------------------------------------------

endif::[]

ifeval::["{release-state}"=="prerelease"]

["source","sh",subs="attributes,callouts"]
--------------------------------------------------
echo "deb https://artifacts.elastic.co/packages/{major-version}/apt stable main" | sudo tee -a /etc/apt/sources.list.d/elastic-{major-version}.list
--------------------------------------------------

endif::[]


[NOTE]
==================================================

These instructions do not use `add-apt-repository` for several reasons:

. `add-apt-repository` adds entries to the system `/etc/apt/sources.list` file
  rather than a clean per-repository file in `/etc/apt/sources.list.d`
. `add-apt-repository` is not part of the default install on many distributions
  and requires a number of non-default dependencies.
. Older versions of `add-apt-repository` always add a `deb-src` entry which
  will cause errors because we do not provide a source package. If you have added
  the `deb-src` entry, you will see an error like the following until you delete
  the `deb-src` line:

    Unable to find expected entry 'main/source/Sources' in Release file
    (Wrong sources.list entry or malformed file)

==================================================

You can install the Elasticsearch Debian package with:

[source,sh]
--------------------------------------------------
sudo apt-get update && sudo apt-get install elasticsearch
--------------------------------------------------

[WARNING]
==================================================
If two entries exist for the same Elasticsearch repository, you will see an error like this during `apt-get update`:

["literal",subs="attributes,callouts"]

Duplicate sources.list entry https://artifacts.elastic.co/packages/{major-version}/apt/ ...`

Examine +/etc/apt/sources.list.d/elasticsearch-{major-version}.list+ for the duplicate entry or locate the duplicate entry amongst the files in `/etc/apt/sources.list.d/` and the `/etc/apt/sources.list` file.
==================================================

endif::[]

include::skip-set-kernel-parameters.asciidoc[]

[[install-deb]]
==== Download and install the Debian package manually

ifeval::["{release-state}"=="unreleased"]

Version {version} of Elasticsearch has not yet been released.

endif::[]

ifeval::["{release-state}"!="unreleased"]

The Debian package for Elasticsearch v{version} can be downloaded from the website and installed as follows:

["source","sh",subs="attributes"]
--------------------------------------------
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-{version}.deb
sha1sum elasticsearch-{version}.deb <1>
sudo dpkg -i elasticsearch-{version}.deb
--------------------------------------------
<1> Compare the SHA produced by `sha1sum` or `shasum` with the
    https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-{version}.deb.sha1[published SHA].

endif::[]

include::init-systemd.asciidoc[]

[[deb-running-init]]
==== Running Elasticsearch with SysV `init`

Use the `update-rc.d` command to configure Elasticsearch to start automatically
when the system boots up:

[source,sh]
--------------------------------------------------
sudo update-rc.d elasticsearch defaults 95 10
--------------------------------------------------

Elasticsearch can be started and stopped using the `service` command:

[source,sh]
--------------------------------------------
sudo -i service elasticsearch start
sudo -i service elasticsearch stop
--------------------------------------------

If Elasticsearch fails to start for any reason, it will print the reason for
failure to STDOUT. Log files can be found in `/var/log/elasticsearch/`.

[[deb-running-systemd]]
include::systemd.asciidoc[]

[[deb-check-running]]
include::check-running.asciidoc[]

[[deb-configuring]]
==== Configuring Elasticsearch

Elasticsearch loads its configuration from the `/etc/elasticsearch/elasticsearch.yml`
file by default.  The format of this config file is explained in
<<settings>>.

The Debian package also has a system configuration file (`/etc/default/elasticsearch`),
which allows you to set the following parameters:

include::sysconfig-file.asciidoc[]

NOTE: Distributions that use `systemd` require that system resource limits be
configured via `systemd` rather than via the `/etc/sysconfig/elasticsearch`
file.  See <<systemd>> for more information.

[[deb-layout]]
==== Directory layout of Debian package

The Debian package places config files, logs, and the data directory in the appropriate
locations for a Debian-based system:


[cols="<h,<,<m,<m",options="header",]
|=======================================================================
| Type | Description | Default Location | Setting
| home
  | Elasticsearch home directory or `$ES_HOME`
  | /usr/share/elasticsearch
 d|

| bin
  | Binary scripts including `elasticsearch` to start a node
    and `elasticsearch-plugin` to install plugins
  | /usr/share/elasticsearch/bin
 d|

| conf
  | Configuration files including `elasticsearch.yml`
  | /etc/elasticsearch
  | path.conf

| conf
  | Environment variables including heap size, file descriptors.
  | /etc/default/elasticsearch
 d|

| data
  | The location of the data files of each index / shard allocated
    on the node. Can hold multiple locations.
  | /var/lib/elasticsearch
  | path.data

| logs
  | Log files location.
  | /var/log/elasticsearch
  | path.logs

| plugins
  | Plugin files location. Each plugin will be contained in a subdirectory.
  | /usr/share/elasticsearch/plugins
  |

| repo
  | Shared file system repository locations. Can hold multiple locations. A file system repository can be placed in to any subdirectory of any directory specified here.
 d| Not configured
  | path.repo

| script
  | Location of script files.
  | /etc/elasticsearch/scripts
  | path.scripts

|=======================================================================

include::next-steps.asciidoc[]
