diff --git a/conf/.env b/conf/.env
new file mode 100644
index 0000000..f94c4e5
--- /dev/null
+++ b/conf/.env
@@ -0,0 +1,14 @@
+# The path to NODEJS
+PATH=__NODEJS_PATH__
+
+# URL of the mongodb
+MONGO_URL=mongodb://127.0.0.1:27017/__DB_NAME__
+
+# Root URL
+ROOT_URL=https://__DOMAIN_URI__
+
+#Port
+PORT=__PORT__
+
+# The Node Environnement
+NODE_ENV=production
diff --git a/conf/systemd.service b/conf/systemd.service
index 0fb4618..5abbcbf 100644
--- a/conf/systemd.service
+++ b/conf/systemd.service
@@ -7,10 +7,7 @@ After=network.target mongodb.service
 Type=simple
 User=__APP__
 Group=__APP__
-Environment="PATH=__ENV_PATH__"
-Environment=NODE_ENV=production
-Environment=MONGO_URL=mongodb://127.0.0.1:27017/__DB_NAME__
-Environment=ROOT_URL=https://__DOMAIN_URI__ PORT=__PORT__
+EnvironmentFile=__FINALPATH__/.env
 WorkingDirectory=__FINALPATH__
 ExecStart=/opt/node_n/bin/node __FINALPATH__/main.js
 Restart=on-failure
diff --git a/scripts/install b/scripts/install
index 90daf64..29f7d26 100755
--- a/scripts/install
+++ b/scripts/install
@@ -194,13 +194,32 @@ ynh_print_info "Configuring a systemd service..."
 ###		- And the section "SETUP SYSTEMD" in the upgrade script
 
 # Create a dedicated systemd config
-ynh_print_info "Adding wekan systemd service ..."
-ynh_replace_string "__ENV_PATH__" "$nodejs_path"               "../conf/systemd.service"
-ynh_replace_string "__DB_NAME__"  "$db_name"                "../conf/systemd.service"
-ynh_replace_string "__DOMAIN_URI__"      "$domain$path_url"          "../conf/systemd.service"
-ynh_replace_string "__PORT__"     "$port"               "../conf/systemd.service"
 ynh_add_systemd_config
 
+#=================================================
+# MODIFY A CONFIG FILE
+#=================================================
+
+### `ynh_replace_string` is used to replace a string in a file.
+### (It's compatible with sed regular expressions syntax)
+cp "../conf/.env" "$final_path/.env"
+
+ynh_replace_string "__NODEJS_PATH__" "$nodejs_path" "$final_path/.env"
+ynh_replace_string "__DB_NAME__" "$db_name" "$final_path/.env"
+ynh_replace_string "__DOMAIN_URI__" "$domain$path_url" "$final_path/.env"
+ynh_replace_string "__PORT__" "$port" "$final_path/.env"
+
+#=================================================
+# STORE THE CONFIG FILE CHECKSUM
+#=================================================
+
+### `ynh_store_file_checksum` is used to store the checksum of a file.
+### That way, during the upgrade script, by using `ynh_backup_if_checksum_is_different`,
+### you can make a backup of this file before modifying it again if the admin had modified it.
+
+# Calculate and store the config file checksum into the app settings
+ynh_store_file_checksum "$final_path/.env"
+
 #=================================================
 # GENERIC FINALIZATION
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index 4f48cfa..6240306 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -69,13 +69,17 @@ fi
 
 if ynh_version_gt "0.77-2" "${previous_version}" ; then
     ynh_install_nodejs 8.9.3
-	ynh_use_nodejs
+    ynh_use_nodejs
     # Create a dedicated systemd config
-    ynh_replace_string "__ENV_PATH__" "$nodejs_path"               "../conf/systemd.service"
-    ynh_replace_string "__DB_NAME__"  "$db_name"                "../conf/systemd.service"
-    ynh_replace_string "__DOMAIN_URI__"      "$domain$path_url"          "../conf/systemd.service"
-    ynh_replace_string "__PORT__"     "$port"               "../conf/systemd.service"
     ynh_add_systemd_config
+    # Create a dedicated .env config
+    ynh_backup_if_checksum_is_different "$final_path/.env"
+    cp "../conf/.env" "$final_path/.env"
+    ynh_replace_string "__NODEJS_PATH__" "$nodejs_path" "$final_path/.env"
+    ynh_replace_string "__DB_NAME__" "$db_name" "$final_path/.env"
+    ynh_replace_string "__DOMAIN_URI__" "$domain$path_url" "$final_path/.env"
+    ynh_replace_string "__PORT__" "$port" "$final_path/.env"
+    ynh_store_file_checksum "$final_path/.env"
 fi
 
 if ynh_version_gt "1.07~ynh2" "${previous_version}" ; then