infra/image system-services: Fix DNS forwarder

The DNS forwarder is set while deploying the IPA server. This forwarder
might not be correct later on.

The old /etc/resolv.conf is copied to /etc/resolv.conf.fixnet by the
fixnet service and later on the fixipaip service is trying to get the
nameserver from the copied file. If the retrieval failed of if the
namesever is 127.0.0.1, then the nameserver will be set to 8.8.8.8.

After fixing the IP addresses for the forward and reverse zone, also the
forwarder is set for the dnsserver "${HOSTNAME}".

infra/image/system-service/fixipaip.sh

@@ -44,11 +44,16 @@ if [ -z "${PTR}" ] || [ -n "${PTR//[0-9]}" ]; then
     echo "ERROR: Failed to get PTR from IPv4 address: '${PTR}'"
     exit 1
 fi
+FORWARDER=$(grep -s -m 1 ^nameserver /etc/resolv.conf.fixnet | cut -d" " -f 2)
+if [ -z "${FORWARDER}" ] || [ "${FORWARDER}" == "127.0.0.1" ]; then
+    FORWARDER="8.8.8.8"
+fi
 
-echo "Fix IPA IP:"
+echo "Fix IPA:"
 echo "  HOSTNAME: '${HOSTNAME}'"
 echo "  IP: '${IP}'"
 echo "  PTR: '${PTR}'"
+echo "  FORWARDER: '${FORWARDER}'"
 
 if ! echo "SomeADMINpassword" | kinit -c "${KRB5CCNAME}"
 then
@@ -77,6 +82,8 @@ for zone in ${ZONES}; do
     fi
 done
 
+ipa dnsserver-mod "${HOSTNAME}" --forwarder="${FORWARDER}"
+
 kdestroy -c "${KRB5CCNAME}" -A
 
 exit 0

infra/image/system-service/fixnet.sh

@@ -51,7 +51,11 @@ else
     echo -e "$IP\t${HOSTNAME} ${HOSTNAME%%.*}" >> /etc/hosts
 fi
 
-echo "nameserver 127.0.0.1" > /etc/resolv.conf
+cp -a /etc/resolv.conf /etc/resolv.conf.fixnet
+cat > /etc/resolv.conf <<EOF
+search ${HOSTNAME#*.}
+nameserver 127.0.0.1
+EOF
 
 echo "/etc/hosts:"
 cat "/etc/hosts"