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Why is switch root not found in initramfs?
The implication is that the switch_root command in your initramfs init script should run switch_root with exec. i.e. exec switch_root The other issue with your “not found” errors is likely because the shared libraries needed by the executables are not found, because the initramfs root filesystem does not have them.
What does it mean if you failed to switch root?
Failed to switch root: Specified switch root path ‘/sysroot’ does not seem to be an OS tree. os-release file is missing. the rdsosreport.txt indicates there is actually nothing mounted at /sysroot, and /proc/cmdline has only one kernel boot option: BOOT_IMAGE= (hd1,gpt7)/vmlinuz-5.8.0-1.el8.elrepo.x86_64.
Why is switch root not working with exec?
The other issue with your “not found” errors is likely because the shared libraries needed by the executables are not found, because the initramfs root filesystem does not have them. If you can get switch_root to work with exec, then is likely the “not found” error will go away.
How does the old systemd binary switch root?
1. The old systemd binary starts switching root by executing initrd-switch-root.service unit which internally executes old systemctl program 2. The new systemd binary on the root file system sends a SIGTERM to initrd-switch-root.service unit while old systemctl program was still executing 3.
What does switch _ root do to the filesystem?
What switch_root does is delete all the files out of rootfs (to free up the memory) and then chroot into a new filesystem and exec a new init process out of the new filesystem. The following shell script fragment demonstrates how to use switch_root:
Why is switch root not working on the command line?
The reason that switch_root is not working on the command line is this code in busybox: You are not PID 1, so you are falling through into this bb_show_usage. The implication is that the switch_root command in your initramfs init script should run switch_root with exec. i.e.
What happens if rootfs does not contain an init program?
If rootfs does not contain an init program after the embedded cpio archive is extracted into it, the kernel will fall through to the older code to locate and mount a root partition, then exec some variant of /sbin/init out of that. All this differs from the old initrd in several ways: