diff --git a/conf/etc/nagios/nrpe.d/check_nrpe.cfg b/conf/etc/nagios/nrpe.d/check_nrpe.cfg
index 4d61e0b..e2ceab4 100644
--- a/conf/etc/nagios/nrpe.d/check_nrpe.cfg
+++ b/conf/etc/nagios/nrpe.d/check_nrpe.cfg
@@ -22,6 +22,7 @@ command[check_memory]               = /usr/local/bin/check_memory
 command[check_systemd]              = /usr/local/bin/check_systemd
 command[check_service]              = /usr/local/bin/check_service
 command[check_log]                  = /usr/local/bin/check_log
+command[check_chrony]               = /usr/local/bin/check_chrony
 
 # with sudo
 
diff --git a/conf/usr/local/bin/check_chrony b/conf/usr/local/bin/check_chrony
new file mode 100755
index 0000000..166b6a0
--- /dev/null
+++ b/conf/usr/local/bin/check_chrony
@@ -0,0 +1,114 @@
+#!/usr/bin/env bash
+
+################################################################################
+# BSD 3-Clause License
+# 
+# Copyright © 2019 Aurélien Grimal - aurelien.grimal@tech-tips.fr
+# All rights reserved.
+#
+# Please see license file on root of this directory
+################################################################################
+
+# !! GIT FILE !!
+# https://framagit.org/zorval/scripts/check-nrpe
+
+################################################################################
+
+WARNING_SECONDS=0.5
+CRITICAL_SECONDS=5
+
+VAR_FILE=/etc/zorval/conf-check_chrony
+[ -f $VAR_FILE ] && source $VAR_FILE
+
+DEBUG=${DEBUG:false}
+
+cmd="chronyc -c tracking"
+CHRONYC_TRACKING=$($cmd)
+RC=$?
+
+if [ $RC -ne 0 ]; then
+    echo "[CRITICAL] Le code retour de '$cmd' vaut $RC !"
+    exit 2
+fi
+
+cmd="chronyc -c sources"
+CHRONYC_SOURCES=$($cmd)
+RC=$?
+
+if [ $RC -ne 0 ]; then
+    echo "[CRITICAL] Le code retour de '$cmd' vaut $RC !"
+    exit 2
+fi
+
+if echo "$CHRONYC_SOURCES" | grep -q ',\*,'; then
+    CHRONYC_SOURCES=$(echo "$CHRONYC_SOURCES" | grep ',\*,')
+else
+    CHRONYC_SOURCES=$(echo "$CHRONYC_SOURCES" | head -n 1)
+fi
+
+read -r Reference_ID Reference_IP Stratum Ref_time System_time Last_offset RMS_offset \
+        Frequency Residual_freq Skew Root_delay Root_dispersion Update_interval Leap_status \
+        <<< $(echo "$CHRONYC_TRACKING" | sed 's/,/ /g')
+
+read -r Source_mode Source_state Name_or_IP_address Stratum Poll Reach LastRx \
+        Last_sample_adjusted_offset Last_sample_measured_offset Last_sample_estimated_error \
+        <<< $(echo "$CHRONYC_SOURCES" | sed 's/,/ /g')
+
+if [ "$DEBUG" = true ]; then
+    echo "================="
+    echo "CHRONYC_TRACKING=$CHRONYC_TRACKING"
+    echo "================="
+    echo "Reference_ID=$Reference_ID"
+    echo "Reference_IP=$Reference_IP"
+    echo "Stratum=$Stratum"
+    echo "Ref_time=$Ref_time"
+    echo "System_time=$System_time"
+    echo "Last_offset=$Last_offset"
+    echo "RMS_offset=$RMS_offset"
+    echo "Frequency=$Frequency"
+    echo "Residual_freq=$Residual_freq"
+    echo "Skew=$Skew"
+    echo "Root_delay=$Root_delay"
+    echo "Root_dispersion=$Root_dispersion"
+    echo "Update_interval=$Update_interval"
+    echo "Leap_status=$Leap_status"
+    echo "================"
+    echo "CHRONYC_SOURCES=$CHRONYC_SOURCES"
+    echo "================"
+    echo "Source_mode=$Source_mode"
+    echo "Source_state=$Source_state"
+    echo "Name_or_IP_address=$Name_or_IP_address"
+    echo "Stratum=$Stratum"
+    echo "Poll=$Poll"
+    echo "Reach=$Reach"
+    echo "LastRx=$LastRx"
+    echo "Last_sample_adjusted_offset=$Last_sample_adjusted_offset"
+    echo "Last_sample_measured_offset=$Last_sample_measured_offset"
+    echo "Last_sample_estimated_error=$Last_sample_estimated_error"
+fi
+
+if [ "$Leap_status" != Normal ]; then
+    echo "[CRITICAL] Leap status vaut '$Leap_status' au lieu de 'Normal' !"
+    exit 2
+fi
+
+if [ "$Source_mode" != '^' ]; then
+    echo "[CRITICAL] Source mode vaut '$Source_mode' au lieu de '^' !"
+    exit 2
+fi
+
+if [ "$Source_state" != '*' ]; then
+    echo "[CRITICAL] Source state vaut '$Source_state' au lieu de '*' !"
+    exit 2
+fi
+
+if (( $(echo "$System_time > $CRITICAL_SECONDS" | bc -l) )) || (( $(echo "$System_time < -$CRITICAL_SECONDS" | bc -l) )); then
+    echo "[CRITICAL] Ce serveur a un décalage de $System_time secondes avec le serveur NTP !"
+    exit 2
+elif (( $(echo "$System_time > $WARNING_SECONDS" | bc -l) )) || (( $(echo "$System_time < -$WARNING_SECONDS" | bc -l) )); then
+    echo "[WARNING] Ce serveur a un décalage de $System_time secondes avec le serveur NTP !"
+    exit 1
+else
+    echo "[OK] Ce serveur a un décalage de $System_time secondes avec le serveur NTP"
+    exit 0
+fi