varnish 缓存到硬盘
方法一：在启动的时候设置
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varnishd -s file,/var/lib/varnish/varnish_storage.bin,50%
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方法二：修改默认启动文件
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vi /etc/default/varnishDAEMON_OPTS="-a :9350 \ -T localhost:9351 \ -f /etc/varnish/default.vcl \ -S /etc/varnish/secret \ -s file,/mnt/varnish/varnish_storage.bin,200G"
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参考：http://nwlinux.com/varnish-file-storage-malloc-or-file/
