pdns slave, zone cleanup script

This script deletes zones on PowerDNS Slave servers, when
the master does not have a SOA record for it (delete zone on master).

helper_scripts/pdns-slave-zone-cleanup.sh

+#!/bin/bash
+#### Config ################################
+
+DBHOST="localhost"
+DBUSER="powerdns"
+DBPASS="password"
+DATABASE="powerdns"
+
+DEBUG="no"
+
+#### End of Config #########################
+
+REQUIRED_COMMANDS="
+mysql
+host
+grep
+awk
+tail
+"
+
+# print debug messages to STDERR
+function debug {
+        if [ "${DEBUG}" == "yes" ] ; then
+                echo "DEBUG: $@" >&2
+        fi
+}
+
+for CMD in ${REQUIRED_COMMANDS} ; do
+        CMDNAME=`echo ${CMD} | awk '{print toupper($1) }' | sed -e s@"-"@""@g`
+        export $(eval "echo ${CMDNAME}")=`which ${CMD} 2>/dev/null`
+        if [ -z "${!CMDNAME}" ] ; then
+                debug "Command: ${CMD} not found!"
+                exit 1
+        else
+                debug "Found command $(echo $CMDNAME) in ${!CMDNAME}"
+        fi
+done
+
+MYSQLCMD="${MYSQL} -h ${DBHOST} -u ${DBUSER} -p${DBPASS} --skip-column-name --silent -e"
+
+check() {
+	AUTH=`${HOST} -t SOA ${2} ${1} | ${TAIL} -n1 | ${GREP} "has no SOA record"`
+	if [ "${AUTH}" == "${2} has no SOA record" ]; then
+		debug "Server ${1} has no SOA for ${2} - removing zone..."
+		DOMAIN_ID=`${MYSQLCMD} "USE ${DATABASE}; SELECT id FROM domains WHERE name='${2}' AND type='SLAVE' AND master='${1}' LIMIT 1;"`
+		${MYSQLCMD} "USE ${DATABASE}; DELETE FROM records WHERE domain_id='${DOMAIN_ID}';"
+		${MYSQLCMD} "USE ${DATABASE}; DELETE FROM domains WHERE id='${DOMAIN_ID}';"
+	fi
+}
+
+MASTERS=(`${MYSQLCMD} "USE ${DATABASE}; SELECT DISTINCT ip FROM supermasters;"`)
+for m in "${MASTERS[@]}"; do
+	NAMES=(`${MYSQLCMD} "USE ${DATABASE}; SELECT name FROM domains WHERE type = 'SLAVE' AND master = '${m}';"`)
+	for d in "${NAMES[@]}"; do
+		check ${m} ${d}
+	done
+done