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Install DNS Safety on Ubuntu 18.04

The following steps show how to install DNS Safety filter on 64-bit Ubuntu Server 18.04 LTS. It is recommended to download installation scripts mentioned on each step from our GitHub repository (sub folder scripts.ubuntu18). Just run them one by one as root.

Step 1. Update

It is recommended to update the system prior to installation. Run bash 01_update.sh in the console.

#!/bin/bash

# update should be done as root
if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root" 1>&2
   exit 1
fi

# add universe repo
add-apt-repository universe

# update, upgrade and reboot
apt update && apt -y upgrade && reboot

Step 2. Install

Run bash 02_dnssafety.sh in the console to install the latest stable version of DNS Safety. Note the /opt/dnssafety/bin/dsdnsd daemon runs as standard daemon user in Linux.

#!/bin/bash

# all packages are installed as root
if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root" 1>&2
   exit 1
fi

# default arc
MAJOR="0.5.0"
MINOR="6D2A"
ARCH="amd64"

# download
wget http://packages.diladele.com/dnssafety/$MAJOR.$MINOR/$ARCH/release/ubuntu18/dnssafety-$MAJOR.${MINOR}_$ARCH.deb

# install
dpkg --install dnssafety-$MAJOR.${MINOR}_$ARCH.deb

# relabel folder
chown -R daemon:daemon /opt/dnssafety

Step 3. Integrate

Finally, to integrate DNS Safety filter with the system run bash 03_integrate.sh. Note how we disable standard systemd-resolver here and place our own DNS server into the system instead.

#!/bin/bash

# all packages are installed as root
if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root" 1>&2
   exit 1
fi

# disable and remove systemd resolver
systemctl disable systemd-resolved
systemctl stop systemd-resolved

# resolv.conf is a link under systemd resolver
ls -lh /etc/resolv.conf

# remove it
rm /etc/resolv.conf

# recreate default one
echo "nameserver 127.0.0.1" > /etc/resolv.conf

# and restart dns safety dns server
systemctl restart dsdnsd

Reboot your server now to see that everything comes back to life correctly after it.