We can install docker-ce like this:

curl -fsSL https://get.docker.com -o get-docker.sh
sh get-docker.sh

Docker-Scripts is a shell script framework for Docker. Install it with these commands:

apt install m4 git
git clone https://gitlab.com/docker-scripts/ds /opt/docker-scripts/ds
cd /opt/docker-scripts/ds/
make install
ds
ds -h

We will need wsproxy for getting a letsencrypt SSL certificate. We can install it like this:

ds pull wsproxy
ds init wsproxy @wsproxy
cd /var/ds/wsproxy/
vim settings.sh
ds make

Now we can install a nextcloud container like this:

ds pull nextcloud
ds init nextcloud @<nc.example.org>
cd /var/ds/<nc.example.org>/
vim settings.sh
vim apps.txt
ds make

Make sure to replace <nc.example.org> with your domain and also to set proper values on settings.sh. To make an automatic installation, uncomment ADMIN_USER and ADMIN_PASS and change the value of the password.

Finally, open https://nc.example.org in browser.

If there are many users that will use this instance of nextcloud, using a DB like mysql or postgresql may help to make things faster and more efficient. You can install a mariadb container like this:

ds pull mariadb
ds init mariadb @mariadb
cd /var/ds/mariadb/
vim settings.sh
ds make

Then uncomment the DB section on /var/ds/<nc.example.org>/settings.sh and build it again:

cd /var/ds/<nc.example.org>/
ds make

To send notifications you can use GMail as an SMTP server. See these instructions and set properly GMAIL_ADDRESS and GMAIL_PASSWD on settings.sh: https://www.lifewire.com/get-a-password-to-access-gmail-by-pop-imap-2-1171882 Then run:

cd /var/ds/<nc.example.org>/
ds update

Note: GMail has some limitations about the amount of emails that can be sent. If you have many users, it is worth to build and use your own SMTP server in order to send notifications. This article describes how to install Postfix in a container and configure it as a SMTP server:

If out RPi is in the network 192.168.1.0/24 and we want to set a fixed IP of 192.168.1.200 to its WiFi interface, we can edit /etc/dhcpcd.conf and append these lines to it:

interface wlan0
static ip_address=192.168.1.200/24
static routers=192.168.1.1
static domain_name_servers=192.168.1.1

Reboot the RPi so that this takes effect. This has been tested on raspbian/buster.

Installation steps and instructions are the same as for the VPS. However, because we don't have a domain name, we also cannot get a SSL certificate, so don't need to install wsproxy.

• Install docker:

  curl -fsSL https://get.docker.com -o get-docker.sh
  sh get-docker.sh
  

• Install docker-scripts:

  apt install m4 git
  git clone https://gitlab.com/docker-scripts/ds /opt/docker-scripts/ds
  cd /opt/docker-scripts/ds/
  make install
  

• Install nextcloud:

  ds pull nextcloud
  ds init nextcloud @nextcloud
  cd /var/ds/nextcloud/
  vim settings.sh
  vim apps.txt
  ds make
  

Make sure to change at least the ADMIN_PASS on settings.sh. Also make sure to add the line PORTS"80:80 443:443"= below the DOMAIN line (this is needed because we are not using the Web Server Proxy).

I don't recommend using a MySQL server for a RPi installation of nextcloud, but it would be nice if you could set properly the settings GMAIL_ADDRESS and GMAIL_PASSWD, so that you could receive notification emails from your nextcloud (look at the end of settings.sh).

A RPi usually has a small disk. If we want to use nextcloud as a backup for our data (for example to store photos), we have to mount an external hard drive and configure nextcloud to use it as a data storage.

For mounting an external drive use these instructions: https://www.raspberrypi.org/documentation/configuration/external-storage.md Mount it on a directory like this: `/var/ds/nextcloud/www/data-external`, which is inside the container. Then follow these steps:

• Make it writable by apache:

  ds exec ls -al data-external
  ds exec chown www-data: -R data-external
  ds exec ls -al data-external
  

• Copy any existing data from the old directory to the new one:

  ds exec ls -al data/
  ds exec rsysnc -a data/ data-external/
  ds exec ls -al data-external/
  

• Change the configuration of nextcloud to use the new data directory:

  ds occ config:system:get datadirectory
  ds occ config:system:set datadirectory --value=/var/www/html/data-external
  cat www/config/config.php | grep datadirectory