On Mon, Aug 28, 2017 at 9:05 PM, Justin Piszcz <jpis...@lucidpixels.com> wrote:
> Hello, > > Question - Is it no longer possible (on distributions with systemd) to use > a rescue USB/CD to boot into a Linux environment that uses systemd? > > Background- I've been using Linux for the past 20 years and I have always > been able to use Knoppix or System Recue CD to rescue/migrate/repair a > Linux system with: > boot: linux root=/dev/sda1 > > Thus, using the kernel+initrd built-in on the USB stick or CD and booting > into my system. > Kernel+initrd on the USB stick, but all remaining modules on the rootfs – which could potentially have modules only for a *very different kernel version* than the one on the USB stick. I am surprised this works at all with highly-modular distro kernels. (Well, I guess the initrd contains just enough modules for disk access and stuff, and a rescue environment rarely needs much else...) > Recently, I had to migrate my root filesystem from one array to another > and found I could no longer do this due to systemd. > > I tried: > boot: linux root=/dev/sda1 init=/bin/bash # this gets me into the system > as it normally would > > However, I cannot boot into the system normally like I could before with: > boot: linux root=/dev/sda1 > > The error with the System Rescue CD is it cannot find /sbin/init (as this > is a symlink to systemd) > > I then tried: > boot: linux root=/dev/sda1 init=/lib/systemd/systemd > > Then I get the following error: > > [!!!!!!] Failed to mount API filesystems, freezing. > Freezing execution. > I suspect this is also due to the kernel mismatch. Whether due to missing modules, or due to the Knoppix kernel missing e.g. cgroup support, or due to it being just *too old* for the installed systemd version... (Or, if systemd was compiled with SMACK support, then failing to mount /sys/fs/smackfs is considered to be critical, which I think is what the sysadmin would expect.) See src/core/mount-setup.c <https://github.com/systemd/systemd/blob/master/src/core/mount-setup.c#L73-L118> for which API filesystems are considered "critical". -- Mantas Mikulėnas <graw...@gmail.com>
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