Scripts to check and restart kresd if it does not respond

sysadmin/turrisos-restart-kresd.sh

@@ -0,0 +1,64 @@
+# Checks DNS and restarts kresd if necessary
+
+# check prerequisites
+
+. /lib/functions.sh
+
+if [ ! -x "$(command -v host)" ]; then
+	echo 'dnscheck error: host is not installed, exiting' >&2
+	exit 1
+fi
+
+perform_check() {
+
+    local host
+    local server
+    local timeout
+    local maxfailures
+    local failure=0
+
+    config_get host check_service host "CHANGEME"
+    config_get server check_service server "10.64.0.1"
+    config_get timeout check_service timeout "5"
+    config_get maxfailures check_service maxfailures "3"
+
+    # check DNS
+    host -w "${timeout}" "${host}" "${server}" &> /dev/null
+    if [ $? -ne 0 ]; then
+        failure=1
+        logger -p err -t "dnscheck" "kresd failed to respond, ${failcount} of ${maxfailures}"
+        let "failcount++"
+    else
+        if [ $failcount -ge 0 ]; then
+            logger -p info -t "dnscheck" "kresd is responding again"
+        fi
+
+        failcount=0
+    fi
+
+    if [ $failcount -ge $maxfailures ]; then
+        failcount=0
+        logger -p err -t "dnscheck" "kresd not responding, restarting"
+
+        # restart service
+        /etc/init.d/resolver restart
+    fi
+
+    return $failure
+}
+
+
+# read configuration
+config_load dnscheck
+
+# check loop
+logger -p info -t "dnscheck" "Starting kresd monitoring"
+failcount=0
+while sleep 10; do
+    perform_check ${job}
+    if [ $? -ne 0 ]; then
+        logger -p err -t "dnscheck" "kresd did not respond and was restarted"
+    fi
+done
+
+exit 0