创建加密存储卷相对简单（例如：https ://www.digitalocean.com/community/tutorials/how-to-create-an-encrypted-file-system-on-a-digitalocean- block-storage-volume。）但是，由于文件系统在启动时被解密，并且服务器始终处于开启状态，所以数据不会以纯文本形式保存在我们的 VPS 上吗？
在永远在线的 VPS 上使用全盘加密有什么价值吗？
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我的目标是让主机在财务上无法访问我的数据和源代码。磁盘加密在这方面有用吗？
我刚刚在 Debian 上安装了 Postfix，并在我的 VPS 上遵循本指南。
当我执行命令时：
$ echo "test email" | sendmail [email protected]
sendmail: command not found
为什么会这样？
有人建议我运行以下命令：
$ sudo find / -name "sendmail"
/var/lib/sendmail
/usr/sbin/sendmail
/usr/lib/sm.bin/sendmail
/usr/lib/sendmail
/usr/share/sendmail
/usr/share/sendmail/examples/dhcp/dhclient-exit-hooks.d/sendmail
/usr/share/sendmail/examples/logcheck/ignore.d.paranoid/sendmail
/usr/share/sendmail/examples/logcheck/ignore.d.server/sendmail
/usr/share/sendmail/examples/logcheck/ignore.d.workstation/sendmail
/usr/share/sendmail/examples/network/if-down.d/sendmail
/usr/share/sendmail/examples/network/if-post-down.d/sendmail
/usr/share/sendmail/examples/network/if-up.d/sendmail
/usr/share/sendmail/examples/ppp/ip-down.d/sendmail
/usr/share/sendmail/examples/ppp/ip-up.d/sendmail
/usr/share/sendmail/examples/resolvconf/update-libc.d/sendmail
/usr/share/sendmail/sendmail
/etc/logcheck/ignore.d.server/sendmail
/etc/logcheck/ignore.d.paranoid/sendmail
/etc/logcheck/ignore.d.workstation/sendmail
/etc/cron.d/sendmail
/etc/network/if-down.d/sendmail
/etc/network/if-post-down.d/sendmail
/etc/network/if-up.d/sendmail
/etc/dhcp/dhclient-exit-hooks.d/sendmail
/etc/alternatives/sendmail
/etc/init.d/sendmail
/etc/cron.daily/sendmail
/etc/ppp/ip-up.d/sendmail
/etc/ppp/ip-down.d/sendmail
/etc/resolvconf/update-libc.d/sendmail
/run/sendmail