- 1 MusicBrainz Server virtual machine
- 2 Migrating the MusicBrainz Server from a Virtual Machine to a Physical Machine
- 3 Setup MusicBrainz Server from source code
- 4 External Links
MusicBrainz Server virtual machine
Running a MusicBrainz Server as a virtual machine requires some Linux knowledge, but it is vastly simpler than installing the server from scratch. (Have a look at the open issues in the bug tracker, though.) The pre-built virtual image can be imported into either VirtualBox or VMware. If you are using Amazon EC2 you can not use this virtual image and will instead have to follow the steps outlined in the source code INSTALL.md. To set up a virtual machine instance, download the torrent file and follow these steps:
Running with VMware
- Start VMWare Player/VMWare Fusion and choose Import... from the File menu. Select the downloaded file.
- Once VMWare has imported the file, select the imported virtual machine from the list of virtual machines and click on Start/Play.
Running with VirtualBox
- Start VirtualBox and choose Import Appliance from the File menu. Select the downloaded file.
- Once VirtualBox has imported the appliance, select the imported virtual machine from the list of virtual machines and click on Start.
Running with QEMU/KVM
- Extract the disk image:
tar -xf musicbrainz-server-2013-10-14.ova
- Covert it from VMWare format:
qemu-img convert -O qcow2 musicbrainz-server-2013-10-14-disk1.vmdk /var/lib/libvirt/images/musicbrainz-server-2013-10-14-disk1.qcow2
- Create and start the new VM:
virt-install --ram 1024 --os-type=linux --os-variant=ubuntuprecise --name musicbrainz-server-2013-10-14 --import --disk /var/lib/libvirt/images/musicbrainz-server-2013-10-14-disk1.qcow2
Using the VM
- Once the instance has started up, log in on the console using the username vm and password musicbrainz. This account has sudo privileges -- if you would like to set a root password, you can do that via sudo.
- You can SSH into the machine via the port 2222 on localhost of the host OS. (e.g. ssh -p 2222 localhost )
- To access the MusicBrainz web site and web service, go to: http://localhost:5000
- To access the Search Server web service, go to: http://localhost:8080
Tuning your VM
We recommend that you give your VM 2GB of ram, if that is possible. The more RAM you give to the VM, the faster it is going to run. To change the memory settings, you will need to shut down the VM, change the settings and then re-start the VM. The Postgres database will be automatically tuned based on the available RAM when the VM starts up.
note: The replication for the current VM might not work. Details on how to fix this are in this blog post.
This VM comes "replication ready". To enable replication, and have the database catch up with the latest replication packets, do this:
This will load all of the changes to the database since the VM update.
NOTE: Loading replication changes might take a long time. If the VM is more than a couple of weeks old, it might be better for you to import a fresh data set. Drop pre-filled database using command
and check the INSTALL.md file for how to import new data.
To turn on background replication, run:
to turn it off:
We recommend leaving replication off for the time being, until you've built search indexes for the VM.
Building search indexes
The VM comes with support to build search indexes. In order to build the indexes, log in to the account and then:
Depending on your machine, this may take quite a long time. We recommend that you leave this running overnight. After the indexes are complete, you should be able to carry out indexed searches in your VM.
Note: Currently, the VM’s resources are too restricted for a full reindexing; see MBVM-8.
Accessing the database
To access the main postgres database, you can do this:
sudo su - musicbrainz cd musicbrainz-server/admin ./psql READWRITE
If you would like to access the DB from outside the virtual box, take a look at how to change postgres connection settings.
Turning the VM into development box
If you would like to use the VM to do development instead of using it as a simple database slave, you'll need to edit lib/DBDefs.pm and set REPLICATION_TYPE to RT_STANDALONE and run admin/psql READWRITE and execute the following queries:
DELETE FROM annotation WHERE editor > (SELECT max(id) FROM editor); DELETE FROM release_annotation WHERE NOT EXISTS (SELECT 1 FROM annotation WHERE annotation.id = release_annotation.annotation);
then from the command line execute:
admin/psql READWRITE < admin/sql/CreateFKConstraints.sql admin/psql READWRITE < admin/sql/CreateFunctions.sql
TODO: The server will probably run out of disk space during this process. We need to add instructions on how to move the DB to a new partition.
Migrating the MusicBrainz Server from a Virtual Machine to a Physical Machine
Taken from AskUbuntu.
It is possible to migrate the MusicBrainz Server image (or any virtual image) from a virtual machine onto bare metal, should you desire to.
- A LiveCD or LiveUSB (this walkthrough will assume you are using a Ubuntu variant as that is what the image is based on.) If you are using an image from 2013-08-01 or earlier, you must have a Ubuntu 12.04.1 Live media.
- USB media large enough to store the raw disk image for writing on a new computer.
Step 1: Converting the Disk to a Raw format
This step is included mostly for the sake of convenience. By doing some prep work on the image before writing, standard Linux tools can be used to write to and manipulate the disk afterwards. This can be done from your current host environment without booting to your LiveCD.
- Load a terminal
cd /path/to/image/ # for VMWare sudo apt-get install qemu-kvm qemu-img convert your-vmware-disk.vmdk -O raw disk.img # For VirtualBox VBoxManage internalcommands converttoraw your-virtualbox-disk.vdi disk.img
disk.imgto somewhere that you're not about to write to. If your target is another physical machine, then an external medium is probably the most convenient way to move the image. These instructions assume that you have moved it to
/media/external/disk.img. Adjust accordingly.
- Before you do anything permanent, make sure you do backups. These instructions will erase anything on the target disk or partition. It's better to be safe than sorry.
Option 1: Write the Image to it's Own Disk
This assumes that you're going to overwrite an entire disk. This is the most ideal situation since the server will have an entire disk to work with. If you're looking to have the image installed along side an existing operating system, skip to Option 2.
- Boot into your LiveCD and Click Try Ubuntu.
- Mount the volume where
disk.imgresides to somewhere safe (like /media/external).
- Determine which volume is your target using a command like
- Then we copy the contents of the image to the drive Replace
sdXwith the correct destination disk. The password for
sudo dd if=/media/external/disk.img of=/dev/sdX
- After this has finished, you can use
gpartedor another utility to manipulate the partition table to the desired layout. It is recommended to have a sizeable swap partition (see this article for some recommendations on how big it should be) as well as expand the root partition to use all remaining available space on the disk. If you desire a seperate boot partition for the system as well, set aside some space here. (Steps for this can be found in the Ubuntu community documentation)
- If you are using an image from 2013-08-01 or earlier, please see here.
Option 2: Installing the Image Alongside Another OS
This is potentially safer than the above method and is very similar. Your LiveCD must be the same Ubuntu version as the virtual image.
- Boot into the LiveCD and click Install Ubuntu.
- Follow the installer prompts, repartition things as you see fit. When the installer finishes, it will ask you to reboot. Do not reboot. You must be in the Live environment for the next instructions.
- Mount your new Ubuntu install (target) and your external disk where you stored
sudo mkdir /media/oldinstall sudo mount -o loop /media/external/disk.img /media/oldinstall
- From there you can either cherry pick files or copy over everything on top of your target. For example, using
sudo rsync /media/oldinstall /media/newinstall
- Reboot and you should be greeted by your virtual machine, but on bare metal. If you have GRUB errors, see this article from the Ubuntu community documentation
Changing Kernel Versions
Parts taken from the Ubuntu community documentation.
For images from 2013-08-01 and older, you will need to change the kernel flavour from -virtual to -generic. The -virtual kernel flavour is lighter, but only supports hardware typically seen in virtual environments while -generic provides support for a wider range of hardware, such as what you would see in a physical server. Both of these versions are provided in the default Ubuntu repositories.
- Boot into your LiveCD. Click "Try Ubuntu"
- Open a terminal.
- Determine which disk is yours using a command like
- Mount your root partition. X is the drive letter and Y is the partition number:
sudo mount /dev/sdXY /mnt
- If you have a seperate boot partition, mount it as well (Z is the boot partition number):
sudo mount /dev/sdXZ /mnt/boot
- Mount the virtual filesystems using the following single command:
for i in /dev /dev/pts /proc /sys /run; do sudo mount -B $i /mnt$i; done
- Chroot into your installation
sudo chroot /mnt
- Install the latest -generic image and headers by installing the metapackage. This will regenerate GRUB's configuration.
sudo apt-get install linux-image-generic linux-header-generic
- Purge the -virtual image and headers. This should also regenerate GRUB's configuration:
sudo apt-get purge --auto-remove linux-image-virtual linux-header-virtual
- Check for leftover -virtual images in
/boot. If you find any, remove them and then run
- Reboot into your installation.
Setup MusicBrainz Server from source code
This can potentially be a very laborious and time consuming method of getting a functioning MusicBrainz server. Using the virtual machine is recommended.
Get a copy of musicbrainz-server from git:
git clone --recursive https://github.com/metabrainz/musicbrainz-server.git musicbrainz-server cd musicbrainz-server
And follow the instructions in the INSTALL file.
The setup process may look daunting, but please don't let this discourage you; the INSTALL is thorough and contains a lot of information, and we are willing to provide assistance. If you have questions about installing, join us in the #musicbrainz-devel IRC channel or post a question on the developers mailing list and we will attempt to help you out.
We recommend that you dive in and give it a try - who knows how far you'll get and what you might learn along the way!
In order to set up a running MusicBrainz server with the full database you will need:
- A linux box, preferably Ubuntu.
- 20GB+ of free disk space, (if you are a developer and only want the server code and database structure somewhat less should do).
- Git knowledge which will enable you to check out the source code.
- PostgreSQL 9.1 or later
As a developer the following knowledge/skills are beneficial:
- Perl and a number of perl modules, PostgreSQL, nginx.
- How to compile and install packages from source on a Linux box.
- How to patch existing packages, although we can help you out if you have questions about that.
Note: The server has never been ported to Windows, and we suspect that it would be a fair amount of work to make that happen.