rename the scripts directory to setup

setup/dns.sh

@@ -0,0 +1,48 @@
+# DNS: Configure a DNS server using nsd
+#######################################
+
+# 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 $PUBLIC_HOSTNAME.
+
+source setup/functions.sh # load our functions
+
+# Install nsd, our DNS server software.
+
+# ...but first, we have to create the user because the 
+# current Ubuntu forgets to do so in the .deb
+# see issue #25 and https://bugs.launchpad.net/ubuntu/+source/nsd/+bug/1311886
+if id nsd > /dev/null 2>&1; then
+	true; #echo "nsd user exists... good";
+else
+	useradd nsd;
+fi
+
+# Okay now install the package.
+# bc is needed by dns_update.
+
+apt_install nsd bc
+
+# Prepare nsd's configuration.
+
+sudo mkdir -p /var/run/nsd
+mkdir -p "$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.
+
+ufw_allow domain
+