Lennart Poettering <lenn...@poettering.net> writes: > On Tue, 09.12.14 13:43, Jan Synáček (jsyna...@redhat.com) wrote: > >> Hello, >> >> what is the difference between emergency, rescue and single-user? >> On F21, systemd-216-12.fc21.x86_64, they all boot into something that >> presents itself as "Welcome to emergency mode!" and they all require a >> root password. In case of booting into emergency.target, I can see >> "Starting Emergency Shell" in the console output. In single-user and >> rescue.target, I can see "Starting Rescue Shell", but they all look the >> same. systemd.special(7) doesn't help much. > > "rescue" is simply how we call the old sysv "single user" mode. This > means all early-boot services are started, but no later boot > service. File systems are hence checked, udev is started, and so > on. You get your shell right after sysinit.target but before > basic.target basically. > > "emergency" maps to the "emergency" mode that sysvinit already knew: > it just starts a shell, and does nothing else. No early-boot services > are run. No udev, no file system checks, no nothing. > > Lennart
Thanks for the explanation! -- Jan Synacek Software Engineer, Red Hat
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