mailinabox/setup/dns.sh

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# DNS: Configure a DNS server using nsd
#######################################
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# After running this script, you also must run setup/dns_update.sh,
# and any time a zone file is added/changed/removed, and any time a
# new domain name becomes in use by a mail user.
#
# This script will turn on DNS for $PUBLIC_HOSTNAME.
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source setup/functions.sh # load our functions
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# Install nsd, our DNS server software.
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# ...but first, we have to create the user because the
# current Ubuntu forgets to do so in the .deb
# see issue #25 and https://bugs.launchpad.net/ubuntu/+source/nsd/+bug/1311886
if id nsd > /dev/null 2>&1; then
true; #echo "nsd user exists... good";
else
useradd nsd;
fi
# Okay now install the package.
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# bc is needed by dns_update.
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apt_install nsd bc
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# Prepare nsd's configuration.
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sudo mkdir -p /var/run/nsd
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mkdir -p "$STORAGE_ROOT/dns";
# Create the default zone if it doesn't exist.
if [ ! -f "$STORAGE_ROOT/dns/$PUBLIC_HOSTNAME.txt" ]; then
# can be an empty file, defaults are applied elsewhere
cat > "$STORAGE_ROOT/dns/$PUBLIC_HOSTNAME.txt" << EOF;
EOF
fi
# Let the storage user own all DNS configuration files.
chown -R $STORAGE_USER.$STORAGE_USER $STORAGE_ROOT/dns
# Permit DNS queries on TCP/UDP in the firewall.
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ufw_allow domain
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