all mine!: Migrating to Nextcloud 9

Now that Nextcloud 9 is out, many users are already interested in migration so I'd like to address the why and how in this blog post.

Edit: Nextcloud 10 is out with loads of unique features. We now also have a client! You can find out about client account migration here.

Why migrate

Let's start with the why. First, you don't have to migrate yet. This release as well as at least the upcoming releases of own- and Nextcloud will be compatible so you'll be able to migrate between them in the future. We don't want to break compatibility if we can avoid it!

Of course, right now Nextcloud 9 has some extra features and fixes and future releases will introduce other capabilities. With regards to security, we have Lukas Reschke working for us. However, we promise that for the foreseeable future we will continue to report all security issues we find to upstream in advance of any release we do. That means well ahead of our usual public disclosure policy, so security doesn't have to be a reason for people to move.

Edit: Nextcloud 10 comes with far more features on top of this. For Nextcloud 11 we have a ambitious road map already but we'll still enable migration from ownCloud 9.1 to Nextcloud 11 so you can migrate at your leisure!

Migration overview

If you've decided to migrate there are a number of steps to go through:

Make sure you have everything set up properly and do a backup
Move the old ownCloud install, preserving data and config
Extract Nextcloud, correct permissions and put back data and config
Switch data and config
Trigger the update via command line or the web UI

Note that we don't offer packages. This has been just too problematic in the past and while we might offer some for enterprise distributions, we hope to work together with distributions to create packages for Nextcloud 9 and newer releases. Once that is done we will of course link to those on our installation page.

There are other great resources besides this blog, especially this awesome post on our forums which gives a great and even more detailed overview of a migration with an Ubuntu/NGINX/PHP7/MariaDB setup.

Edit: With regard to packages, there are now packages for CentOS and Fedora and other distributions will likely follow soon. See our packages repository if you want to help!

Preparation

First, let's check if you're set up properly. Make sure:

You are on ownCloud 8.2.3 or later
Make sure you have all dependencies
Your favorite apps are compatible (with ownCloud 9), you can check this by visiting the app store at apps.owncloud.com
You made a backup

Once that's all done, time to move to the next step: cleaning out the old files.

Removing old files

In this step, we'll move the existing installation preserving the data and configuration.

Put your server in maintenance mode. Go to the folder ownCloud is installed in and execute sudo -u www-data php occ maintenance:mode --on (www-data has to be your HTTP user). You can also edit your config.php file and changing 'maintenance' => false, to 'maintenance' => true,.
Now move the data and config folder out of the way. Best to go to your webserver folder (something like /var/www/htdocs/ and do a mv owncloud owncloud-backup

Deploying Nextcloud

Now, we will put Nextcloud in place.

Grab Nextcloud from our download page or use wget: wget https://download.nextcloud.com/server/releases/nextcloud-9.0.50.zip

Optional: you can verify if the download went correct using our MD5 code, see this page. Run md5sum nextcloud-9.0.50.zip. The output has to match this value: 5ae47c800d1f9889bd5f0075b6dbb3ba

Now extract Nextcloud: unzip nextcloud-9.0.50.zip or tar -xvf nextcloud-9.0.50.tar.bz2
Put the config.php file in the right spot: cp owncloud-backup/config/config.php nextcloud/config/config.php
Now change the ownership of the files to that of your webserver, for example chown wwwrun:www * -R or chown www-data *
If you keep your data/ directory in your owncloud/ directory, copy it to your new nextcloud/ [*]. If you keep it outside of owncloud/ then you don't need to do anything as its location is in config.php.

* Note that if you have been upgrading your server from before ownCloud 6.0 there is a risk that moving the data directory causes issues. It is best to keep the folder with Nextcloud named 'owncloud'. This also avoids having to change all kinds of settings on the server, so it might be a wise choice in any case: rename the nextcloud folder to owncloud.

Now upgrade!

Next up is restarting the webserver and upgrading.

Restart your webserver. How depends on your distribution. For example, rcapache2 restart on openSUSE, service restart apache2 on Ubuntu.
You can now trigger the update either via OCC or via web. Command line is the most reliable solution. Run it as sudo -u apache php occ upgrade from the nextcloud folder. This has to run as the user of your webserver and thus can also be www-data or www for example.
Then, finally, turn of maintenance mode: sudo -u www-data php occ maintenance:mode --off