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How to enable new Quad9 ( DNS and DNSSEC service in Ubuntu 17.10 64-bit using a bash shell script

# How to enable new Quad9 ( DNS and DNSSEC service 
# in Ubuntu 17.10 64-bit using a bash shell script
# adapt /etc/resolv.conf symlink in order to get DNSSEC support
# working again:
sudo rm /etc/resolv.conf
sudo ln -s /run/systemd/resolve/resolv.conf /etc/resolv.conf
# enable systemd caching DNS resolver
rm /tmp/nsswitch.conf
rm /tmp/nsswitch.conf.1
cp /etc/nsswitch.conf /tmp/nsswitch.conf
grep -v hosts /tmp/nsswitch.conf > /tmp/nsswitch.conf.1
# dns must be mentioned in next line, or else wget does not work
echo 'hosts: files mdns4_minimal  resolv dns myhostname' >> /tmp/nsswitch.conf.1
sudo cp /tmp/nsswitch.conf.1 /etc/nsswitch.conf
# set DNS server to
rm /tmp/resolved.conf
rm /tmp/resolved.conf.1
cp /etc/systemd/resolved.conf /tmp/resolved.conf
grep -v DNS /tmp/resolved.conf > /tmp/resolved.conf.1
# enable new Quad9 ( DNS and DNSSEC service
# https://arstechnica.com/information-technology/2017/11/new-quad9-dns-service-blocks-malicious-domains-for-everyone/
echo 'DNS=' >> /tmp/resolved.conf.1
echo 'DNSSEC=yes' >> /tmp/resolved.conf.1
sudo cp /tmp/resolved.conf.1 /etc/systemd/resolved.conf
sudo systemd-resolve --flush-caches
sudo systemctl restart systemd-resolved
sudo systemd-resolve --flush-caches
sudo systemd-resolve --status
# test DNSSEC validation using dig command-line tool
# see: https://docs.menandmice.com/display/MM/How+to+test+DNSSEC+validation
dig pir.org +dnssec +multi

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