See full tutorial here : https://cedricleruth.com/how-to-configure-your-own-dropbox-alternative-encrypted-private-file-cloud-storage-on-aws-with-owncloud/

installOwnCloudOnLinuxEC2.sh

#SSH to your instance
#example :
#chmod 600 YOURPEMKEY.pem
#ssh -i YOURPEMKEY.pem ec2-user@YOURELASTICIP
#update current packages
 sudo yum update -y

#install prerequisites
 sudo rpm -ivh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
 sudo rpm -ivh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm
 sudo yum –enablerepo=webtatic
 sudo amazon-linux-extras install -y lamp-mariadb10.2-php7.2 php7.2
 sudo yum install -y httpd mariadb-server
 sudo yum remove -y php*
 sudo yum install -y php72w php72w-gd php72w-json php72w-pdo php72w-curl php72w-intl php72w-mcrypt php72w-zip php72w-xml php72w-mbstring php72w-mysqlnd
 


#Install Owncloud
 sudo yum –enablerepo=epel install php-pear-Net-Curl php-pear-MDB2-Driver-mysqli
 cd /etc/yum.repos.d/
sudo rpm --import https://download.owncloud.org/download/repositories/production/CentOS_7/repodata/repomd.xml.key
sudo wget http://download.owncloud.org/download/repositories/production/CentOS_7/ce:stable.repo
sudo yum -y install owncloud-files
sudo chown -R apache.apache /var/www/html/owncloud/

#Start and enable httpd and mariadb
sudo systemctl start httpd
sudo systemctl start mariadb
sudo systemctl enable httpd
sudo systemctl enable mariadb
sudo mysql_secure_installation

#configure Owncloud db
 mysql -u root -p
# Press enter when they ask you for password

MariaDB [(none)]> create database clouddb;
Query OK, 1 row affected (0.00 sec)

MariaDB [(none)]> grant all on clouddb.* to 'clouddbuser'@'localhost' identified by 'YOUR_PASSWORD';
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]>exit


#Setup second disk to be able to receive owncloud files
[root@ip-YOUR_ELASTIC_IP ] lsblk
NAME    MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
xvda    202:0    0    8G  0 disk
└─xvda1 202:1    0    8G  0 part /
xvdb    202:16   0  500G  0 disk

#Mount the disk, more detail here :https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-using-volumes.html
#So here we see that my disk is name xvdb
#Let's mount it
sudo file -s /dev/xvdb
sudo mkfs -t ext4 /dev/xvdb
sudo mkdir /owncloudDisk
sudo mount /dev/xvdb /owncloudDisk
sudo cp /etc/fstab /etc/fstab.orig
sudo file -s /dev/xvdb
sudo vim /etc/fstab
# Add a line with your UID example : UUID=YOURUID  /owncloudDisk  ext4  quiet,defaults,permissions,locale=en_US.utf8  0  2
sudo mount -a
sudo chmod 0770 /owncloudDisk/
sudo chown -R apache:apache /owncloudDisk

sudo service httpd restart