Migrating to a Different Server
If the need arises, ownCloud can be migrated to a different server. A typical use case would be a hardware change or a migration from the Enterprise appliance to a physical server. All migrations have to be performed with ownCloud in maintenance mode. Online migration is supported by ownCloud only when implementing industry-standard clustering and high-availability solutions before ownCloud is installed for the first time.
To start, let’s work through a potential use case. A configured ownCloud instance runs reliably on one machine, but for some reason the instance needs to be moved to a new machine. Depending on the size of the ownCloud instance the migration might take several hours.
For the purpose of this use case, it is assumed that:
The end users reach the ownCloud instance via a virtual hostname (such as a DNS
CNAMErecord) which can be pointed at the new location.
The authentication method (e.g., LDAP) remains the same after the migration.
|During the migration, do not make any changes to the original system, except for putting it into maintenance mode. This ensures, should anything unforeseen happen, that you can go back to your existing installation and resume availability of your installation while debugging the problem.|
Then, on the original machine turn on maintenance mode and then stop ownCloud. After waiting 6 - 7 minutes for all sync clients to register that the server is in maintenance mode, stop the web server that is serving ownCloud.
After that, create a database dump from the database, copy it to the new machine, and import it into the new database. Then, copy only your data, configuration, and database files from your original ownCloud instance to the new machine.
You must keep the
The data files should keep their original timestamp otherwise the
clients will re-download all the files after the migration. This step
might take several hours, depending on your installation. This can be
done on a number of sync clients, such as by using
With ownCloud still in maintenance mode and before changing the DNS
CNAME record, start up the database and web server on the new machine.
Then point your web browser to the migrated ownCloud instance and
You see the maintenance mode notice
That a log file entry is written by both the web server and ownCloud
That no error messages occur.
If all of these things occur, then take ownCloud out of maintenance mode and repeat. After doing this, log in as an admin and confirm that ownCloud functions as normal.
At this point, change the DNS
CNAME entry to point your users to the
new location. And with the
CNAME entry updated, you now need to update
the trusted domains.
All URLs used to access your ownCloud server must be whitelisted in your
config.php file, under the
trusted_domains setting. Users are
allowed to log into ownCloud only when they point their browsers to a
URL that is listed in the
|This setting is important when changing or moving to a new domain name. You may use IP addresses and domain names.|
A typical configuration looks like this:
'trusted_domains' => [ 0 => 'localhost', 1 => 'server1.example.com', 2 => '192.168.1.50', ],
The loopback address,
127.0.0.1, is automatically whitelisted, so as
long as you have access to the physical server you can always log in. In
the event that a load-balancer is in place, there will be no issues as
long as it sends the correct
Now, let’s step through an example migration. For this example to work, you will need the following on both the servers that you will use for the migration:
Before you can perform a migration, you have to prepare. To do this, first make sure SSH is installed:
apt install ssh -y
Next, edit ssh-config and enable root ssh login.
nano /etc/ssh/sshd_config PermitRootLogin yes
And then restart SSH.
service ssh restart
Lastly, install ownCloud on the new server.
The first step is to enable maintenance mode. To do that, use the following commands:
cd /var/www/owncloud/ sudo -u www-data php occ maintenance:mode --on
After that’s done, wait for 6-7 minutes and stop Apache:
service apache2 stop
Now, you have to transfer the database from the old server to the new one. To do that, first backup the database.
cd /var/www/owncloud/ mysqldump --single-transaction -h localhost -u admin -ppassword owncloud > owncloud-dbbackup.bak
Then, export the database to the new server.
rsync -Aaxt owncloud-dbbackup.bak root@new_server_address:/var/www/owncloud
With that completed, import the database on new server.
mysql -h localhost -u admin -ppassword owncloud < owncloud-dbbackup.bak
You can find the values for the mysqldump command in your config.php, in your owncloud root directory.
For InnoDB tables only
The –single-transaction flag will start a transaction before running.
Rather than lock the entire database, this will let
For Mixed MyISAM / InnoDB tables
Either dumping your MyISAM tables separately from InnoDB tables or use
rsync -Aavxt config data root@new_server_address:/var/www/owncloud
|If you want to move your data directory to another location on the target server, it is advised to do this as a second step. Please see the data directory migration document for more details.|
Now it’s time to finish the migration. To do that, on the new server, first verify that ownCloud is in maintenance mode.
sudo -u www-data php occ maintenance:mode
Next, start up the database and web server on the new machine.
service mysql start service apache2 start
With that done, point your web browser to the migrated ownCloud instance, and confirm that you see the maintenance mode notice, and that no error messages occur. If both of these occur, take ownCloud out of maintenance mode.
sudo -u www-data php occ maintenance:mode --off
And finally, log in as admin and confirm normal function of ownCloud. If you have a domain name, and you want an SSL certificate, we recommend certbot.
Now you need to reverse the change to ssh-config. Specifically, set
no and restart ssh. To do that, run the following command:
service ssh restart
Finally, update the DNS’
CNAME entry to point to your new server.
If you have not only migrated physically from server to server but have also changed your ownCloud server’s domain name, you also need to update the domain in the Trusted Domain setting in
config.php, on the target server.