Debian-based distributions (.deb)

You can install Neo4j on Debian, and Debian-based distributions like Ubuntu, using the Neo4j Debian package.

Java prerequisites

Neo4j 2025.01 requires the Java 21 runtime.

OpenJDK Java 21

Most of our supported Linux distributions have OpenJDK Java 21 available by default. Consequently, no extra setup is required if you are using OpenJDK Java, the correct Java dependency will be installed by the package manager when installing Neo4j.

Oracle JDK, Zulu JDK, or Corretto JDK

If you wish to use a non-default JDK, it must be installed before starting the Neo4j installation. Otherwise, your package manager will install the default Java distribution for your operating system, usually OpenJDK.

Java download and installation instructions can be found on the manufacturer’s website:

Dealing with multiple installed Java versions

You must configure your default Java version to point to Java 21, or Neo4j 2025.01.0 will be unable to start. Do so with the update-java-alternatives command.

List all your installed versions of Java with update-java-alternatives --list.

Your results may vary, but this is an example of the output:

java-1.21.0-openjdk-amd64 2111 /usr/lib/jvm/java-1.21.0-openjdk-amd64
java-1.17.0-openjdk-amd64 1711 /usr/lib/jvm/java-1.17.0-openjdk-amd64

Identify your Java 21 version from the list of installed javas. In this case, it is java-1.21.0-openjdk-amd64.
Set Java 21 as the default by replacing <java21name> with its name:
```
sudo update-java-alternatives --jre --set <java21name>
```
Confirm which version of Java is the default using java -version.

Installation

Add the repository

The Debian package is available from https://debian.neo4j.com.

To add the Neo4j repository to the package manager, run the following as a sudo user:

wget -O - https://debian.neo4j.com/neotechnology.gpg.key | sudo gpg --dearmor -o /etc/apt/keyrings/neotechnology.gpg
echo 'deb [signed-by=/etc/apt/keyrings/neotechnology.gpg] https://debian.neo4j.com stable latest' | sudo tee -a /etc/apt/sources.list.d/neo4j.list
sudo apt-get update

Once the repository has been added to apt, you can verify which Neo4j versions are available by running:

apt list -a neo4j

In Ubuntu server installations, you also need to make sure that the universe repository is enabled. If the universe repository is not present, the Neo4j installation will fail with the error Depends: daemon but it is not installable.

This can be fixed by running the command:

sudo add-apt-repository universe

Install Neo4j

To install Neo4j, run one of the following commands depending on which version you want to install:

Neo4j Community Edition:
```
sudo apt-get install neo4j=1:2025.01.0
```

Neo4j Enterprise Edition:

sudo apt-get install neo4j-enterprise=1:2025.01.0

Note that the version includes an epoch version component (1:), following the Debian policy on versioning.

When installing Neo4j Enterprise Edition, you will be prompted to accept the license agreement. Once the license agreement is accepted installation begins. Your answer to the license agreement prompt will be remembered for future installations on the same system.

To forget the stored answer, and trigger the license agreement prompt on subsequent installation, use debconf-communicate to purge the stored answer:

echo purge | sudo debconf-communicate neo4j-enterprise

Non-interactive installation of Neo4j Enterprise Edition

For Neo4j Enterprise Edition, the license agreement is presented in an interactive prompt. If you require non-interactive installation of Neo4j Enterprise Edition, you can indicate that you have read and accepted the license agreement using debconf-set-selections:

echo "neo4j-enterprise neo4j/accept-license select Accept commercial license" | sudo debconf-set-selections

Offline installation

If you cannot reach https://debian.neo4j.com, perhaps due to a firewall, you need to obtain Neo4j via an alternative machine that has the relevant access, and then move the package manually.

It is important to note that using this method will mean that the offline machine will not receive the dependencies that are normally downloaded and installed automatically when using apt for installing Neo4j; Cypher Shell and Java (if not installed already):

The Cypher Shell package can be downloaded from Neo4j Deployment Center.
For information on supported versions of Java, see System requirements.

Run the following to download the required Debian software package:
- Neo4j Enterprise Edition:
  curl -O https://dist.neo4j.org/deb/neo4j-enterprise_2025.01.0_all.deb
  To list all files that the Debian software package (.deb file) installs:
  
  dpkg --contents neo4j_2025.01.0_all.deb
- Neo4j Community Edition:
  curl -O https://dist.neo4j.org/deb/neo4j_2025.01.0_all.deb
Manually move the downloaded Debian package to the offline machine.
Run the following on the offline machine to install Neo4j:
```
sudo dpkg -i <deb file name>
```

File locations

File locations for all Neo4j packages are documented here.

Operation

Most Neo4j configuration goes into neo4j.conf.

For operating systems using systemd, some package-specific options are set in neo4j.service and can be edited using systemctl edit neo4j.service.

For operating systems that are not using systemd, some package-specific options are set in /etc/default/neo4j.

Environment variable	Default value	Details
NEO4J_SHUTDOWN_TIMEOUT	120	Timeout in seconds when waiting for Neo4j to stop. If it takes longer than this then the shutdown is considered to have failed. This may need to be increased if the system serves long-running transactions.
NEO4J_ULIMIT_NOFILE	60000	Maximum number of file handles that can be opened by the Neo4j process.

Environment variable

Default value

Details

NEO4J_SHUTDOWN_TIMEOUT

120

Timeout in seconds when waiting for Neo4j to stop. If it takes longer than this then the shutdown is considered to have failed. This may need to be increased if the system serves long-running transactions.

NEO4J_ULIMIT_NOFILE

60000

Maximum number of file handles that can be opened by the Neo4j process.

Starting the service automatically on system start

On Debian-based distributions, run the following command to ensure that Neo4j starts automatically at boot time:

sudo systemctl enable neo4j

Before starting up the database for the first time, it is recommended to use the set-initial-password command of neo4j-admin to define the password for the native user neo4j.

If the password is not set explicitly using this method, it will be set to the default password neo4j. In that case, you will be prompted to change the default password at first login.

For more information, see Set an initial password.

For more information on operating the Neo4j system service, see Neo4j system service.

Uninstall Neo4j

Follow these steps to uninstall Neo4j:

(Optional) Create a backup to avoid losing your data.
Uninstall Neo4j:
```
---
sudo apt remove neo4j
---
```