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Installing MusicBrainz Server

The easiest method of installing a local MusicBrainz Server is to download the pre-configured virtual machine.

If you want to manually set up MusicBrainz Server from source, read on!

Prerequisites

  1. A Unix based operating system

    The MusicBrainz development team uses a variety of Linux distributions, but Mac OS X will work just fine, if you're prepared to potentially jump through some hoops. If you are running Windows we recommend you set up a Ubuntu virtual machine.

    This document will assume you are using Ubuntu for its instructions.

  2. Perl (at least version 5.10.1)

    Perl comes bundled with most Linux operating systems, you can check your installed version of Perl with:

    perl -v

  3. PostgreSQL (at least version 8.4)

    PostgreSQL is required, along with its development libraries. To install using packages run the following, replacing 8.x with the latest version.

    sudo apt-get install postgresql-8.x postgresql-server-dev-8.x postgresql-contrib-8.x

    Since Ubuntu 11.10, you can also install postgresql 9.x; replace '8.x' by the most recent 9.x version to do so.

    Alternatively, you may compile PostgreSQL from source, but then make sure to also compile the cube extension found in contrib/cube. The database import script will take care of installing that extension into the database when it creates the database for you.

  4. Git

    The MusicBrainz development team uses Git for their DVCS. To install Git, run the following:

    sudo apt-get install git-core

  5. Memcached

    By default the MusicBrainz server requires a Memcached server running on the same server with default settings. To install Memcached, run the following:

    sudo apt-get install memcached

    You can change the memcached server name and port, or configure other datastores in lib/DBDefs.pm.

  6. Standard Development Tools

    In order to install some of the required Perl and Postgresql modules, you'll need a C compiler and make. You can install a basic set of development tools with the command:

    sudo apt-get install build-essential

Server configuration

  1. Download the source code.

    git clone git://git.musicbrainz.org/musicbrainz-server.git
cd musicbrainz-server

  2. Modify the server configuration file.

    cp lib/DBDefs.pm.default lib/DBDefs.pm

    Fill in the appropriate values for MB_SERVER_ROOT and WEB_SERVER.

    Determine what type of server this will be and set REPLICATION_TYPE accordingly:

    1. RT_SLAVE (mirror server)

      A mirror server will always be in sync with the master database at http://musicbrainz.org by way of an hourly replication packet. Mirror servers do not allow any local editing. After the initial data import, the only changes allowed will be to load the next replication packet in turn.

      Mirror servers will have their WikiDocs automatically kept up to date.

      If you are not setting up a mirror server for development purposes, make sure to set DB_STAGING_SERVER to 0.

      If you're setting up a slave server, make sure you have something set up for the READONLY database setting in lib/DBDefs.pm; it can just be a copy of what's in READWRITE if you don't need anything fancy.

    2. RT_STANDALONE

      A stand alone server is recommended if you are setting up a server for development purposes. They do not accept the replication packets and will require manually importing a new database dump in order to bring it up to date with the master database. Local editing is available, but keep in mind that none of your changes will be pushed up to http://musicbrainz.org.

      Stand alone servers will need to manually download and update their WikiDoc transclusion table:

      wget -O root/static/wikidocs/index.txt http://musicbrainz.org/static/wikidocs/index.txt

    If you chose RT_SLAVE, please ensure that there is a configuration for both READONLY and READWRITE, or the server will not function correctly. (Both can be configured the same in a simple setup).

Installing Perl dependencies

The fundamental thing that needs to happen here is all the dependency Perl modules get installed, somewhere where your server can find them. There are many ways to make this happen, and the best choice will be very site-dependent. MusicBrainz ships with support for Carton, a Perl package manager, which will allow you to have the exact same dependencies as our production servers. Carton also manages everything for you, and lets you avoid polluting your system installation with these dependencies.

Below outlines how to setup MusicBrainz server with Carton.

  1. Prerequisites

    Before you get started you will actually need to have Carton installed as MusicBrainz does not yet ship with an executable. There are also a few development headers that will be needed when installing dependencies. Run the following steps as a normal user on your system.

    sudo apt-get install libxml2-dev libpq-dev libexpat1-dev libdb-dev memcached
sudo cpan Carton

    NOTE: This installs Carton at the system level, if you prefer to install this in your home directory, use local::lib.

  2. Install dependencies

    To install the dependencies for MusicBrainz server, first make sure you are in the MusicBrainz source code directory and run the following:

    carton install --deployment

    Note that if you've previously used this command in the musicbrainz folder it will not always upgrade all packages to their correct version. If you're having trouble running musicbrainz, run "rm -rf local" in the musicbrainz directory to remove all packages previously installed by carton, and then run the above step again.

    If you still see errors, you can install individual packages manually by running:

    carton install {module name}

    Where {module name} is something like Function::Parameters or Locale::TextDomain.

Creating the database

  1. Install PostgreSQL Extensions

    Before you start, you need to install the PostgreSQL Extensions on your database server. To build the musicbrainz_unaccent extension run these commands:

    cd postgresql-musicbrainz-unaccent
make
sudo make install
cd ..

    To build our collate extension you will need libicu and its development headers, to install these run:

    sudo apt-get install libicu-dev

    With libicu installed, you can build and install the collate extension by running:

    cd postgresql-musicbrainz-collate
make
sudo make install
cd ..

    Note: If you are using Ubuntu 11.10, the collate extension currently does not work with gcc 4.6 and needs to be built with an older version such as gcc 4.4. To do this, run the following:

    sudo apt-get install gcc-4.4
cd postgresql-musicbrainz-collate
CC=gcc-4.4 make -e
sudo make install
cd ..

  2. Setup PostgreSQL authentication

    For normal operation, the server only needs to connect from one or two OS users (whoever your web server / crontabs run as), to one database (the MusicBrainz Database), as one PostgreSQL user. The PostgreSQL database name and user name are given in DBDefs.pm (look for the READWRITE key). For example, if you run your web server and crontabs as "www-user", the following configuration recipe may prove useful:

    # in pg_hba.conf (Note: The order of lines is important!):
local    musicbrainz_db    musicbrainz    ident    map=mb_map

# in pg_ident.conf:
mb_map    www-user    musicbrainz

    Alternatively, if you are running a server for development purposes and don't require any special access permissions, the following configuration in pg_hba.conf will suffice (make sure to insert this line before any other permissions):

    local   all    all    trust

  3. Create the database

    You have two options when it comes to the database. You can either opt for a clean database with just the schema (useful for developers with limited disk space), or you can import a full database dump.

    1. Use a clean database

      To use a clean database, all you need to do is run:

      carton exec ./admin/InitDb.pl -- --createdb --clean

    2. Import a database dump

      Our database dumps are provided twice a week and can be downloaded from ftp://ftp.musicbrainz.org/pub/musicbrainz/data/fullexport/

      To get going, you need at least the mbdump.tar.bz2, mbdump-editor.tar.bz2 and mbdump-derived.tar.bz2 archives, but you can grab whichever dumps suit your needs.

      Assuming the dumps have been downloaded to /tmp/dumps/ you can verify that the data is correct by running:

      pushd /tmp/dumps/ && md5sum -c MD5SUMS && popd

      You can also verify that the data dumps were indeed created by MusicBrainz verifying them against our GPG signing key:

      gpg --recv-keys C777580F
gpg --verify-files /tmp/dump/*.gpg

      If this is OK and you wish to continue, you can import them with:

      carton exec ./admin/InitDb.pl -- --createdb --import /tmp/dumps/mbdump*.tar.bz2 --echo

      --echo just gives us a bit more feedback in case this goes wrong, you may leave it off. Remember to change the paths to your mbdump*.tar.bz2 files, if they are not in /tmp/dumps/.

    NOTE: on a fresh postgresql install you may see the following error:

    CreateFunctions.sql:33: ERROR:  language "plpgsql" does not exist

    To resolve that login to postgresql with the "postgres" user (or any other postgresql user with SUPERUSER privileges) and load the "plpgsql" language into the database with the following command:

    postgres=# CREATE LANGUAGE plpgsql;

Starting the server

You should now have everything ready to run the development server!

The development server is a lightweight HTTP server that gives good debug output and is much more convenient than having to set up a standalone server. Just run:

carton exec -- plackup -Ilib -r

Visiting http://your.machines.ip.address:5000 should now present you with your own running instance of the MusicBrainz Server.

If you'd like a more permanent setup, the plackup documentation may prove useful in setting up a server such as nginx, using FastCGI.

Translations

If you intend to run a server with translations, there are a few steps to follow:

  1. Prerequisites

    Make sure gettext is installed (you need msgmerge and msgfmt, at least), and the transifex client 'tx' (http://help.transifex.com/features/client/index.html):

      sudo apt-get install gettext transifex-client

    Configure a username and password in ~/.transifexrc using the format listed on the above page.

  2. Change to the po directory

      cd po/

  3. Get translations

      tx pull -l {a list of languages you want to pull}

    This will download the .po files for your language(s) of choice to the po/ folder with the correct filenames.

  4. Install translations

      make install

    This will compile and install the files to lib/LocaleData/{language}/LC_MESSAGES/{domain}.mo

  5. Add the languages to MB_LANGUAGES in DBDefs.pm. These should be formatted {lang}-{country}, e.g. 'es', or 'fr-ca', in a space-separated list.

  6. Ensure you have a system locale for any languages you want to use, and for some languages, be wary of https://rt.cpan.org/Public/Bug/Display.html?id=78341

    For many languages, this will suffice:

      sudo apt-get install language-pack-{language code}

    To work around the linked CPAN bug, you may need to edit the file for Locale::Util (if you've installed with carton, local/lib/perl5/Locale/Util.pm) to add entries to LANG2COUNTRY. Suggested ones include:

    • es => 'ES'
    • et => 'EE'
    • el => 'GR'
    • sl => 'SI' (this one is there in 1.20, but needs amendment)

Troubleshooting

If you have any difficulties, please feel free to contact ocharles or warp in #musicbrainz-devel on irc.freenode.net, or email the developer mailing list at musicbrainz-devel [at] lists.musicbrainz.org.

Please report any issues on our bug tracker.

Good luck, and happy hacking!