update

doc/关于12.1服务器的配置.md

@@ -257,6 +257,17 @@ docker run \
     hwdsl2/ipsec-vpn-server
 ```
 
+vpn.env配置文件
+
+```shell
+# Define your own values for these variables
+# - DO NOT put "" or '' around values, or add space around =
+# - DO NOT use these special characters within values: \ " '
+VPN_IPSEC_PSK=civvpn.vicp.net
+VPN_USER=wohitech
+VPN_PASSWORD=wohitech
+```
+
 查看状态
 
 ```shell