我在我的 centos 7 盒子上安装了 varnish 4.0，我的 params 文件如下所示：
RELOAD_VCL=1
VARNISH_VCL_CONF=/etc/varnish/default.vcl
VARNISH_LISTEN_PORT=80
VARNISH_ADMIN_LISTEN_ADDRESS=127.0.0.1
VARNISH_ADMIN_LISTEN_PORT=6082
VARNISH_SECRET_FILE=/etc/varnish/secret
VARNISH_STORAGE_FILE=/var/lib/varnish/varnish_storage.bin
VARNISH_STORAGE_SIZE=5G
VARNISH_STORAGE="file,${VARNISH_STORAGE_FILE},${VARNISH_STORAGE_SIZE}"
VARNISH_TTL=120
VARNISH_USER=varnish
VARNISH_GROUP=varnish
当我启动我的清漆时，我收到以下错误：
Unit varnish.service has begun starting up.
varnishd[14888]: Error: (-sfile) "${VARNISH_STORAGE_FILE}" does not exist and could not be created
systemd[1]: varnish.service: control process exited, code=exited status=2
systemd[1]: Failed to start Varnish Cache, a high-performance HTTP accelerator.
文件的所有者是清漆，我已经没有想法如何让它工作了。