[systemd-devel] emergency, rescue and single-user
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. Cheers, -- Jan Synacek Software Engineer, Red Hat signature.asc Description: PGP signature ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] emergency, rescue and single-user
On Tue, Dec 9, 2014 at 2:43 PM, 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.target pulls in sysinit.target (mounts, swaps, udev, sysctl...), while emergency.target starts a sulogin shell and nothing more. See the graph in bootup(7). The sysv single-user mode maps directly to rescue.target. -- Mantas Mikulėnas graw...@gmail.com ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] emergency, rescue and single-user
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 -- Lennart Poettering, Red Hat ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] emergency, rescue and single-user
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 signature.asc Description: PGP signature ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] emergency, rescue and single-user
Mantas Mikulėnas graw...@gmail.com writes: On Tue, Dec 9, 2014 at 2:43 PM, 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.target pulls in sysinit.target (mounts, swaps, udev, sysctl...), while emergency.target starts a sulogin shell and nothing more. See the graph in bootup(7). Ok, good to know about bootup(7), thanks! -- Jan Synacek Software Engineer, Red Hat signature.asc Description: PGP signature ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
