To allow openvasmd to work, you need to do the following
# Generate a Server Certificate
openvas-mkcert
# Generate a Client Certificate
openvas-mkcert-client -n -i
# get nvt feed
openvas-nvt-sync (free) or greenbone-nvt-sync (commercial)
# get scap feed
openvas-scapdata-sync (free) or greenbone-scapdata-sync (commercial)
# get cert feed
openvas-certdata-sync (free) or greenbone-certdata-sync (commercial
# Generate initial NVT cache (takes some minutes)
rc-service openvassd create_cache
# Start the OpenVAS Scanner
rc-service openvassd start or systemctl start openvassd.service
# Initialize the Database (This is going to take some time, pehaps time to get coffee?)
openvasmd --rebuild --progress -v
# Create an admin user and note down the initial password
openvasmd --create-user=admin --role=Admin
# Start the OpenVAS Manager
rc-service openvasmd start or systemctl start openvasmd
# Start the Greenbone Security Assistant
rc-service gsad start or systemctl start gsad
