Public bug reported: The documentation in /usr/share/doc/cryptsetup/README.remote.gz write smth along these lines:
To unlock from remote, you could do something like this: ssh -o "UserKnownHostsFile=~/.ssh/known_hosts.initramfs" \ -i "~/id_rsa.initramfs" r...@initramfshost.example.com \ "echo -ne \"secret\" >/lib/cryptsetup/passfifo" However, due to plymouth being installed by default (maybe bug 595648) it doesn't respect the fifo we're supposed to be writing to. Uninstalling plymouth doesn't work: root@ubuntu:~# apt-get purge plymouth Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: cron : Depends: upstart-job E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages. root@ubuntu:~# Installing the plymouth-disabler also doesn't help. What helps is to kill the plymouthd process before writing to the fifo. However, I can't figure out how to reliably determine the PID of plymouthd. I expected the documentation to be reasonably accurate. ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: cryptsetup 2:1.6.1-1ubuntu7 ProcVersionSignature: Ubuntu 3.19.0-12.12-generic 3.19.3 Uname: Linux 3.19.0-12-generic x86_64 ApportVersion: 2.17-0ubuntu1 Architecture: amd64 CurrentDesktop: GNOME Date: Thu Apr 9 08:02:27 2015 SourcePackage: cryptsetup UpgradeStatus: No upgrade log present (probably fresh install) crypttab: # target source key options chinacrypto UUID=286618e1-09c0-4f5c-9bb9-1cf5f96b2dc6 none luks,retry=1,lvm=chinalvm ** Affects: cryptsetup (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug vivid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1441983 Title: documentation remote unlocking inaccurate To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cryptsetup/+bug/1441983/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs