diff options
| -rwxr-xr-x | roles/openshift_node_dnsmasq/files/networkmanager/99-origin-dns.sh | 47 |
1 files changed, 41 insertions, 6 deletions
diff --git a/roles/openshift_node_dnsmasq/files/networkmanager/99-origin-dns.sh b/roles/openshift_node_dnsmasq/files/networkmanager/99-origin-dns.sh index 5a187710b..ced0fa663 100755 --- a/roles/openshift_node_dnsmasq/files/networkmanager/99-origin-dns.sh +++ b/roles/openshift_node_dnsmasq/files/networkmanager/99-origin-dns.sh @@ -1,4 +1,5 @@ #!/bin/bash -x +# -*- mode: sh; sh-indentation: 2 -*- # This NetworkManager dispatcher script replicates the functionality of # NetworkManager's dns=dnsmasq however, rather than hardcoding the listening @@ -28,7 +29,16 @@ cd /etc/sysconfig/network-scripts [ -f ../network ] && . ../network if [[ $2 =~ ^(up|dhcp4-change)$ ]]; then - # couldn't find an existing method to determine if the interface owns the + # If the origin-upstream-dns config file changed we need to restart + NEEDS_RESTART=0 + UPSTREAM_DNS='/etc/dnsmasq.d/origin-upstream-dns.conf' + # We'll regenerate the dnsmasq origin config in a temp file first + UPSTREAM_DNS_TMP=`mktemp` + UPSTREAM_DNS_TMP_SORTED=`mktemp` + CURRENT_UPSTREAM_DNS_SORTED=`mktemp` + + ###################################################################### + # couldn't find an existing method to determine if the interface owns the # default route def_route=$(/sbin/ip route list match 0.0.0.0/0 | awk '{print $3 }') def_route_int=$(/sbin/ip route get to ${def_route} | awk '{print $3}') @@ -43,15 +53,37 @@ domain-needed server=/cluster.local/172.30.0.1 server=/30.172.in-addr.arpa/172.30.0.1 EOF + # New config file, must restart + NEEDS_RESTART=1 fi - # zero out our upstream servers list and feed it into dnsmasq - echo -n > /etc/dnsmasq.d/origin-upstream-dns.conf + + ###################################################################### + # Generate a new origin dns config file for ns in ${IP4_NAMESERVERS}; do if [[ ! -z $ns ]]; then - echo "server=${ns}" >> /etc/dnsmasq.d/origin-upstream-dns.conf + echo "server=${ns}" fi - done - systemctl restart dnsmasq + done > $UPSTREAM_DNS_TMP + + # Sort it in case DNS servers arrived in a different order + sort $UPSTREAM_DNS_TMP > $UPSTREAM_DNS_TMP_SORTED + sort $UPSTREAM_DNS > $CURRENT_UPSTREAM_DNS_SORTED + + # Compare to the current config file (sorted) + NEW_DNS_SUM=`md5sum ${UPSTREAM_DNS_TMP_SORTED} | awk '{print $1}'` + CURRENT_DNS_SUM=`md5sum ${CURRENT_UPSTREAM_DNS_SORTED} | awk '{print $1}'` + + if [ "${NEW_DNS_SUM}" != "${CURRENT_DNS_SUM}" ]; then + # DNS has changed, copy the temp file to the proper location (-Z + # sets default selinux context) and set the restart flag + cp -Z $UPSTREAM_DNS_TMP $UPSTREAM_DNS + NEEDS_RESTART=1 + fi + + ###################################################################### + if [ "${NEEDS_RESTART}" -eq "1" ]; then + systemctl restart dnsmasq + fi sed -i '0,/^nameserver/ s/^nameserver.*$/nameserver '"${def_route_ip}"'/g' /etc/resolv.conf @@ -59,4 +91,7 @@ EOF echo "# nameserver updated by /etc/NetworkManager/dispatcher.d/99-origin-dns.sh" >> /etc/resolv.conf fi fi + + # Clean up after yourself + rm -f $UPSTREAM_DNS_TMP $UPSTREAM_DNS_TMP_SORTED $CURRENT_UPSTREAM_DNS_SORTED fi |