Today, we configure our Nextcloud to automatically scan files for viruses. To do this, we need to install ClamAV and configure the antivirus app.

Step 1: First install ClamAV

sudo apt install clamav clamav-freshclam clamav-daemon

and start the ClamAV update process:

sudo systemctl stop clamav-freshclam
sudo freshclam

Then we edit the ClamAV configuration

sudo nano /etc/clamav/clamd.conf

and adjust the following values to fit our installation:

MaxDirectoryRecursion 30
MaxFileSize 100M
PCREMaxFileSize 100M
StreamMaxLength 100M

now we restart ClamAv and freshclam

sudo systemctl restart clamav-freshclam
sudo systemctl restart clamav-daemon

freshclam checks every hour to see if there are any updates for ClamAV.

Step 2: Install Antivirus-App in Nextcloud

We switch to the Nextcloud directory and the apps folder in there:

cd /var/www/html/nextcloud/apps

and download the antivirus app, unpack it and set the rights for Apache:

sudo wget https://github.com/nextcloud/files_antivirus/archive/master.zip
sudo unzip master.zip
sudo mv files_antivirus-master files_antivirus
sudo rm master.zip
sudo chown -R www-data:www-data /var/www/html/nextcloud/apps/files_antivirus

Now we activate the antivirus app in the settings of Nextcloud:

and go to the additional settings to change the values for scanning:

We set the mode to „Daemon (Socket)“
Transmission length to „104857600“
and the last settings to „Log only“ or „Delete file“, as we favor it:

Now we have made our Nextcloud even safer. 🙂

That’s it and have fun…