initial dns failover script

1 files changed, 40 insertions, 0 deletions

diff --git a/frontends/scripts/dnsfailover.sh.tpl b/frontends/scripts/dnsfailover.sh.tpl
new file mode 100644
index 0000000..86fa4e8
--- /dev/null
+++ b/frontends/scripts/dnsfailover.sh.tpl
@@ -0,0 +1,40 @@
+#!/bin/sh
+
+ZONES_DIR=/var/nsd/zones/master/
+MASTER_A=master_a
+MASTER_AAAA=master_aaaa
+STANDBY_A=standby_a
+STANDBY_AAAA=standby_aaaa
+
+process_zone () {
+    sed -E '
+        /IN A .*; Enable failover/ {
+            /^mirror/! {
+                s/^(.*) 300 IN A (.*) ; (.*)/\1 300 IN A '$MASTER_A' ; \3/;
+            }
+            /^mirror/ {
+                s/^(.*) 300 IN A (.*) ; (.*)/\1 300 IN A '$STANDBY_A' ; \3/;
+            }
+        }
+        /IN AAAA .*; Enable failover/ {
+            /^mirror/! {
+                s/^(.*) 300 IN AAAA (.*) ; (.*)/\1 300 IN AAAA '$MASTER_AAAA' ; \3/;
+            }
+            /^mirror/ {
+                s/^(.*) 300 IN AAAA (.*) ; (.*)/\1 300 IN AAAA '$STANDBY_AAAA' ; \3/;
+            }
+        }
+        / ; serial/ {
+            s/^( +) ([0-9]+) .*; (.*)/\1 '`date +%s`' ; \3/;
+        }
+    '
+}
+
+failover_zone () {
+    zone=$1
+    cat $zone | process_zone
+}
+
+for zone in $ZONES_DIR/snonux.foo.zone; do
+    failover_zone $zone
+done