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How to migrate from an already existing Nextcloud installation to Nextcloud AIO?

There are basically two ways how to migrate from an already existing Nextcloud installation to Nextcloud AIO:

  1. Migrate only the files which is the easiest way
  2. Migrate the files and the database which is much more complicated

Migrate only the files

Please note: If you used groupfolders or encrypted your files before, you will need to restore the database, as well!

The procedure for migrating only the files works like this:

  1. Take a backup of your former instance (especially from your datadirectory)
  2. Install Nextcloud AIO on a new server/linux installation, enter your domain and wait until all containers are running
  3. Recreate all users that were present on your former installation
  4. Take a backup using Nextcloud AIO's built-in backup solution (so that you can easily restore to this state again) (Note: this will stop all containers and is expected: don't start the container again at this point!)
  5. Restore the datadirectory of your former instance into the following directory: /var/lib/docker/volumes/nextcloud_aio_nextcloud_data/_data/
  6. Next, run sudo chown -R 33:0 /var/lib/docker/volumes/nextcloud_aio_nextcloud_data/_data/* and sudo chmod -R 750 /var/lib/docker/volumes/nextcloud_aio_nextcloud_data/_data/* to apply the correct permissions
  7. Start the containers again and wait until all containers are running
  8. Run sudo docker exec -it nextcloud-aio-nextcloud php occ files:scan-app-data && sudo docker exec -it nextcloud-aio-nextcloud php occ files:scan --all in order to scan all files in the datadirectory.

Migrate the files and the database

Please note: this is much more complicated than migrating only the files and also not as failproof so be warned!
Also, you will currently not be able to use local external storage in Nextcloud AIO since that is not supported, yet. See nextcloud#76

The procedure for migrating the files and the database works like this:

  1. Make sure that your old instance is on exactly the same version like the version used in Nextcloud AIO. (e.g. 23.0.0) If not, simply upgrade your former installation to that version or wait until the version used in Nextcloud AIO got updated to the same version of your former installation or the other way around.
  2. Take a backup of your former instance (especially from your datadirectory and database)
  3. If your former installation didn't use Postgresql already, you will now need to convert your old installation to use Postgresql as database temporarily (in order to be able to perform a pg_dump afterwards):
    1. Install Postgresql on your former installation: on a Debian based OS should the following command work: 
      sudo apt update && sudo apt install postgresql -y
    2. Create a new database by running: 
      export PG_USER="ncadmin"
export PG_PASSWORD="my-temporary-password"
export PG_DATABASE="nextcloud_db"
sudo -u postgres psql <<END
CREATE USER $PG_USER WITH PASSWORD '$PG_PASSWORD';
CREATE DATABASE $PG_DATABASE WITH OWNER $PG_USER TEMPLATE template0 ENCODING 'UTF8';
END
    3. Run the following command to start the conversion: 
      occ db:convert-type --all-apps --password "$PG_PASSWORD" pgsql "$PG_F
USER" 127.0.0.1 "$PG_DATABASE"
      Please note: You might need to change the ip-address 127.0.0.1 based on your exact installation.
      Further information on the conversion is additionally available here: https://docs.nextcloud.com/server/stable/admin_manual/configuration_database/db_conversion.html#converting-database-type
    4. Hopefully does the conversion finish successfully. If not, simply restore your old Nextcloud installation from backup. If yes, you should now log in to your Nextcloud and test if everything works and if all data has been converted successfully.
    5. If everything works as expected, feel free to continue with the steps below.
  4. Now, run a pg_dump to get an export of your current database. Something like the following command should work: 
    sudo -Hiu postgres pg_dump "$PG_DATABASE"  > ./database-dump.sql
    Please note: The exact name of the database export file is important! (database-dump.sql)
    And of course you need to to use the correct name that the Postgresql database has for the export (if $PG_DATABASE doesn't work directly).
  5. At this point, you can finally install Nextcloud AIO on a new server/linux installation, enter your domain (use the same domain that you used on your former installation) and wait until all containers are running
  6. Next, take a backup using Nextcloud AIO's built-in backup solution (so that you can easily restore to this state again) (Note: this will stop all containers and is expected: don't start the container again at this point!)
  7. Now, we are slowly starting to import your files and database. First, you need to modify the datadirectory that is stored inside the database export:
    1. Find out what the directory of your old Nextcloud installation is by e.g. opening the config.php file and looking at the value datadirectory.
    2. Now, create a copy of the database file so that you can simply restore it if you should make a mistake while editing: cp database-dump.sql database-dump.sql.backup
    3. Next, open the database export with e.g. nano: nano database-dump.sql
    4. Press [CTRL] + [w] in order to open the search
    5. Type in local::/your/old/datadir/ which should bring up the exact line where you need to modify the path to use the one used in Nextcloud AIO, instead.
    6. Change it to look like this: local::/mnt/ncdata/.
    7. Now save the file by pressing [CTRL] + [o] then [ENTER] and close nano by pressing [CTRL] + [x]
    8. In order to make sure that everything is good, you can now run grep "/your/old/datadir" database-dump.sql which should not bring up further results.
  8. Next, copy the database dump into the correct place and prepare the database container which will import from the database dump automatically the next container start: 
    sudo rm /var/lib/docker/volumes/nextcloud_aio_database_dump/_data/database-dump.sql
sudo cp database-dump.sql /var/lib/docker/volumes/nextcloud_aio_database_dump/_data/
sudo chmod 777 /var/lib/docker/volumes/nextcloud_aio_database_dump/_data/database-dump.sql
sudo rm -r /var/lib/docker/volumes/nextcloud_aio_database/_data/*
  9. If the commands above were executed successfully, restore the datadirectory of your former instance into the following directory: /var/lib/docker/volumes/nextcloud_aio_nextcloud_data/_data/
  10. Next, run sudo chown -R 33:0 /var/lib/docker/volumes/nextcloud_aio_nextcloud_data/_data/* and sudo chmod -R 750 /var/lib/docker/volumes/nextcloud_aio_nextcloud_data/_data/*to apply the correct permissions
  11. Edit the Nextcloud AIO config.php file that is stored in /var/lib/docker/volumes/nextcloud_aio_nextcloud/_data/config/config.php and modify only passwordsalt, secret, instanceid and set it to the old values that you used on your old installation. If you are brave, feel free to modify further values e.g. add your old LDAP config or S3 storage config. (Some things like Mail server config can be added back using Nextcloud's webinterface later on).
  12. When you are done and saved your changes to the file, finally start the containers again and wait until all containers are running.
  13. Now run sudo docker exec -it nextcloud-aio-nextcloud php occ maintenance:data-fingerprint.
  14. As last step, install all apps again that were installed before on your old instance by using the webinterface.

Now the whole Nextcloud instance should work again.
If not, feel free to restore the AIO instance from backup and start at step 8 again.