今天在FreeBSD用dmesg命令查看信息时，发现最后几行出现了错误 提示信息：
/usr was not properly dismounted
/tmp was not properly dismounted
/var was not properly dismounted
几经周折，终于解决了，解决方法如下：
shutdown -h now /halt/reboot/
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nginx报错nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) 仔细参考nginx中文文档发现，发送信号USR2时，自动启动新的可执行文件，再手动启动的话就会报错 本质上也算是一种地址冲...
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The Vps is too old to get a newer OS from the provider. create /etc/apt/sources.list.d/jessie-backports.list, and fill in the following line...
