diff --git a/creationRoutesVM.sh b/creationRoutesVM.sh
index 09b2358..9f7037a 100755
--- a/creationRoutesVM.sh
+++ b/creationRoutesVM.sh
@@ -10,6 +10,13 @@
 # - LOG_PLACE
 # - CHEMIN_CACHE
 
+write_log() {
+	# $1: log level (INFO, ERR, etc.)
+	# $2: message
+	printf "$(date -Isecond) - $1: $2\n" >> \
+		${LOG_PLACE}/$(date -Idate)_vm_routing.log
+}
+
 # IPAM creds
 if [ -f creds ]; then
 	source creds
@@ -41,16 +48,16 @@ BOOL_V6=0
 LOG_PLACE='./vm_id_log/'
 if [ ! -d "${LOG_PLACE}" ];then
 	mkdir -p ${LOG_PLACE}
-	echo "$(date -Isecond) - INFO : Creation du repertoire de logs vm_id" > ${LOG_PLACE}/$(date -Idate)_vm_id.log
+	write_log INFO 'Creation of the log dir'
 fi
 
-echo "$(date -Isecond) - INFO : Début de l'exécution du script d'ajout de routes VM" >> ${LOG_PLACE}/$(date -Idate)_vm_id.log
+write_log INFO 'Beginning of the script execution'
 
 # Chemin fichier de CACHE (et création du répertoire s'il n'existe pas)
 CHEMIN_CACHE='./vm_id_cache/'
 if [ ! -d "${CHEMIN_CACHE}" ];then
 	mkdir -p ${CHEMIN_CACHE}
-	echo "$(date -Isecond) - INFO : Creation du repertoire de cache vm_id" >> ${LOG_PLACE}/$(date -Idate)_vm_id.log
+	write_log INFO 'Creation of the cache dir'
 fi
 
 # Fonction d'aide
@@ -64,7 +71,7 @@ if [ $? != 0 ]; then
 	echo "$(date -Isecond) - ERREUR : probleme au lancement du script" >> ${LOG_PLACE}/$(date -Idate)_vm_id.log
 	exit 1
 fi
- 
+
 # On vérifie la bonne présence d'un paramètre VM_ID
 if [ $1 ]; then
 	if [ $1 = '-h' ] || [ $1 = '--help' ]; then
@@ -130,7 +137,7 @@ if [ ${CODE_RETOUR_RES_AUTHENT} -eq 200 ] ;then
 				if [ -n "${VM_IPV4}" ]; then
 					# Ajout de la route associée
 					echo "ip -4 route add ${VM_IPV4}/32 dev tap${VM_ID}i0 (source : IPAM)"
-					echo "$(date -Isecond) - INFO : ip -4 route add ${VM_IPV4}/32 dev tap${VM_ID}i0 (source : IPAM)" >> ${LOG_PLACE}/$(date -Idate)_vm_id.log
+					write_log INFO "ip -4 route add ${VM_IPV4}/32 dev tap${VM_ID}i0 (source : IPAM)"
 					ip -4 route add ${VM_IPV4}/32 dev tap${VM_ID}i0
 					BOOL_V4=1
 				else
@@ -162,7 +169,7 @@ if [ ${CODE_RETOUR_RES_AUTHENT} -eq 200 ] ;then
 				if [ -n "${VM_IPV6}" ]; then
 					# Ajout de la route associée
 					echo "ip -6 route add ${VM_IPV6}/48 dev tap${VM_ID}i0 (source : IPAM)"
-					echo "$(date -Isecond) - INFO : IPAM : ip -6 route add ${VM_IPV6}/48 dev tap${VM_ID}i0" >> ${LOG_PLACE}/$(date -Idate)_vm_id.log
+					write_log INFO "ip -6 route add ${VM_IPV6}/48 dev tap${VM_ID}i0 (source IPAM)"
 					ip -6 route add ${VM_IPV6}/48 dev tap${VM_ID}i0
 					BOOL_V6=1
 				else
@@ -192,7 +199,7 @@ else
 				if [ -n "${VM_IPV4}" ]; then
 					# Ajout de la route associée
 					echo "ip -4 route add ${VM_IPV4}/32 dev tap${VM_ID}i0 (source : CACHE)"
-					echo "$(date -Isecond) - INFO : ip -4 route add ${VM_IPV4}/32 dev tap${VM_ID}i0 (source : CACHE)" >> ${LOG_PLACE}/$(date -Idate)_vm_id.log
+					write_log INFO "ip -4 route add ${VM_IPV4}/32 dev tap${VM_ID}i0 (source: cache)"
 					ip -4 route add ${VM_IPV4}/32 dev tap${VM_ID}i0
 					BOOL_V4=1
 				else
@@ -221,7 +228,7 @@ else
 				if [ -n "${VM_IPV6}" ]; then
 					# Ajout de la route associée
 					echo "ip -6 route add ${VM_IPV6}/48 dev tap${VM_ID}i0 (source : CACHE)"
-					echo "$(date -Isecond) - INFO : ip -6 route add ${VM_IPV6}/48 dev tap${VM_ID}i0 (source : CACHE)" >> ${LOG_PLACE}/$(date -Idate)_vm_id.log
+					write_log INFO "ip -6 route add ${VM_IPV6}/48 dev tap${VM_ID}i0 (source: cache)"
 					ip -6 route add ${VM_IPV6}/48 dev tap${VM_ID}i0
 					BOOL_V6=1
 				else
@@ -237,5 +244,5 @@ else
 		fi
 	done
 fi
-echo "$(date -Isecond) - INFO : Fin de l'exécution du script d'ajout de routes VM" >> ${LOG_PLACE}/$(date -Idate)_vm_id.log
+write_log INFO 'Script ended'
 exit 0