# Gerrit Code Review - Standalone Daemon Installation Guide

version v2.11.4-13-g93a6f3b

## Requirements

To run the Gerrit service, the following requirements must be met on the host:

- JDK, minimum version 1.7 Download

You’ll also need an SQL database to house the review metadata. You have the choice of either using the embedded H2 or to host your own MySQL or PostgreSQL.

## Configure Java for Strong Cryptography

Support for extra strength cryptographic ciphers: AES128CTR, AES256CTR, ARCFOUR256, and ARCFOUR128 can be enabled by downloading the Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files from Oracle and installing them into your JRE.

Note | Installing JCE extensions is optional and export restrictions may apply.

1. Download the unlimited strength JCE policy files.

   - JDK7 JCE policy files

   - JDK8 JCE policy files

2. Uncompress and extract the downloaded file.

   The downloaded file contains the following files:

   README.txt | Information about JCE and installation guide
   local_policy.jar | Unlimited strength local policy file
   US_export_policy.jar | Unlimited strength US export policy file

3. Install the unlimited strength policy JAR files by following instructions found in `README.txt`.

## Download Gerrit

Current and past binary releases of Gerrit can be obtained from the Gerrit Releases site.

Download any current `*.war` package. The war will be referred to as `gerrit.war` from this point forward, so you may find it easier to rename the downloaded file.

If you would prefer to build Gerrit directly from source, review the notes under developer setup.

## Database Setup

During the init phase of Gerrit you will need to specify which database to use.

### H2

If you choose H2, Gerrit will automatically set up the embedded H2 database as backend so no set up or configuration is necessary.

Using the embedded H2 database is the easiest way to get a Gerrit site up and running, making it ideal for proof of concepts or small team servers. On the flip side, H2 is not the recommended option for large corporate installations. This is because there is no easy way to interact with the database while Gerrit is offline, it’s not easy to backup the data, and it’s not possible to set up H2 in a load balanced/hotswap configuration.

If this option interests you, you might want to consider the quick guide.

### PostgreSQL

This option is more complicated than the H2 option but is recommended for larger installations. It’s the database backend with the largest userbase in the Gerrit community.

Create a user for the web application within Postgres, assign it a password, create a database to store the metadata, and grant the user full rights on the newly created database:

      $ createuser --username=postgres -RDIElPS gerrit2
      $ createdb --username=postgres -E UTF-8 -O gerrit2 reviewdb

Visit PostgreSQL’s documentation for further information regarding using PostgreSQL.

### MySQL

This option is also more complicated than the H2 option. Just as with PostgreSQL it’s also recommended for larger installations.

Create a user for the web application within the database, assign it a password, create a database, and give the newly created user full rights on it:

      mysql

      CREATE USER 'gerrit2'@'localhost' IDENTIFIED BY 'secret';
      CREATE DATABASE reviewdb;
      GRANT ALL ON reviewdb.* TO 'gerrit2'@'localhost';
      FLUSH PRIVILEGES;

Visit MySQL’s documentation for further information regarding using MySQL.

### Oracle

PostgreSQL or H2 is the recommended database for Gerrit Code Review. Oracle is supported for environments where running on an existing Oracle installation simplifies administrative overheads, such as database backups.

Create a user for the web application within sqlplus, assign it a password, and grant the user full rights on the newly created database:

      SQL> create user gerrit2 identified by secret_password default tablespace users;
      SQL> grant connect, resources to gerrit2;

JDBC driver ojdbc6.jar must be obtained from your Oracle distribution. Gerrit initialization process tries to copy it from a known location:

    /u01/app/oracle/product/11.2.0/xe/jdbc/lib/ojdbc6.jar

If this file can not be located at this place, then the alternative location can be provided.

Instance name is the Oracle SID. Sample database section in $site_path/etc/gerrit.config:

    [database]
            type = oracle
            instance = xe
            hostname = localhost
            username = gerrit2
            port = 1521

Sample database section in $site_path/etc/secure.config:

    [database]
            password = secret_pasword

### SAP MaxDB

SAP MaxDB is a supported database for running Gerrit Code Review. However it is recommended only for environments where you intend to run Gerrit on an existing MaxDB installation to reduce administrative overhead.

In the MaxDB studio or using the SQLCLI command line interface create a user 'gerrit2' with the user class 'RESOURCE' and a password <secret password>. This will also create an associated schema on the database.

To run Gerrit on MaxDB, you need to obtain the MaxDB JDBC driver. It can be found in your MaxDB installation at the following location:

- on Windows 64bit at "C:\Program Files\sdb\MaxDB\runtime\jar\sapdbc.jar"

- on Linux at "/opt/sdb/MaxDB/runtime/jar/sapdbc.jar"

It needs to be stored in the 'lib' folder of the review site.

In the following sample database section it is assumed that the database name is 'reviewdb' and the database is installed on localhost:

In $site_path/etc/gerrit.config:

    [database]
            type = maxdb
            database = reviewdb
            hostname = localhost
            username = gerrit2

In $site_path/etc/secure.config:

    [database]
            password = <secret password>

Visit SAP MaxDB’s documentation for further information regarding using SAP MaxDB.

Part of Gerrit Code Review

## Initialize the Site

Gerrit stores configuration files, the server’s SSH keys, and the managed Git repositories under a local directory, typically referred to as `'$site_path'`. If the embedded H2 database is being used, its data files will also be stored under this directory.

You also have to decide where to store your server side git repositories. This can either be a relative path under `'$site_path'` or an absolute path anywhere on your server system. You have to choose a place before commencing your init phase.

Initialize a new site directory by running the init command, passing the path of the site directory to be created as an argument to the '-d' option. Its recommended that Gerrit Code Review be given its own user account on the host system:

      sudo adduser gerrit2
      sudo su gerrit2

      java -jar gerrit.war init -d /path/to/your/gerrit_application_directory

'Please note:' If you choose a location where your new user doesn’t have any privileges, you may have to manually create the directory first and then give ownership of that location to the `'gerrit2'` user.

If run from an interactive terminal, the init command will prompt through a series of configuration questions, including gathering information about the database created above. If the terminal is not interactive, running the init command will choose some reasonable default selections, and will use the embedded H2 database. Once the init phase is complete, you can review your settings in the file `'$site_path/etc/gerrit.config'`.

When running the init command, additional JARs might be downloaded to support optional selected functionality. If a download fails a URL will be displayed and init will wait for the user to manually download the JAR and store it in the target location.

When the init phase is complete, the daemon will be automatically started in the background and your web browser will open to the site:

      Initialized /home/gerrit2/review_site
      Executing /home/gerrit2/review_site/bin/gerrit.sh start
      Starting Gerrit Code Review: OK
      Waiting for server to start ... OK
      Opening browser ...

When the browser opens, sign in to Gerrit through the web interface. The first user to sign-in and register an account will be automatically placed into the fully privileged Administrators group, permitting server management over the web and over SSH. Subsequent users will be automatically registered as unprivileged users.

## Installation Complete

Your base Gerrit server is now installed and running. You’re now ready to either set up more projects or start working with the projects you’ve already imported.

## Project Setup

See Project Configuration for further details on how to register a new project with Gerrit. This step is necessary if existing Git repositories were not imported during 'init'.

## Start/Stop Daemon

To control the Gerrit Code Review daemon that is running in the background, use the rc.d style start script created by 'init':

    review_site/bin/gerrit.sh start
    review_site/bin/gerrit.sh stop
    review_site/bin/gerrit.sh restart

('Optional') Configure the daemon to automatically start and stop with the operating system.

Uncomment the following 3 lines in the `'$site_path/bin/gerrit.sh'` script:

    chkconfig: 3 99 99
    description: Gerrit Code Review
    processname: gerrit

Then link the `gerrit.sh` script into `rc3.d`:

    sudo ln -snf `pwd`/review_site/bin/gerrit.sh /etc/init.d/gerrit
    sudo ln -snf /etc/init.d/gerrit /etc/rc3.d/S90gerrit

('Optional') To enable autocompletion of the gerrit.sh commands, install autocompletion from the `/contrib/bash_completion` script. Refer to the script’s header comments for installation instructions.

To install Gerrit into an existing servlet container instead of using the embedded Jetty server, see J2EE installation.

## Site Customization

Gerrit Code Review supports some site-specific customization options. For more information, see the related topics in this manual:

- Reverse Proxy

- Single Sign-On Systems

- Themes

- Gitweb Integration

- Other System Settings

- Automatic Site Initialization on Startup

## Anonymous Access

Exporting the Git repository directory (gerrit.basePath) over the anonymous, unencrypted git:// protocol is more efficient than Gerrit’s internal SSH daemon. See the `git-daemon` documentation for details on how to configure this if anonymous access is desired.

- man git-daemon

## Plugins

Place Gerrit plugins in the review_site/plugins directory to have them loaded on Gerrit startup.

## External Documentation Links

- PostgreSQL Documentation

- MySQL Documentation

- git-daemon

Part of Gerrit Code Review