From a3628fc49db4d88ff3e4067268650710d1da3f6f Mon Sep 17 00:00:00 2001 From: Silvino Silva Date: Fri, 12 Feb 2021 03:59:34 +0000 Subject: initial openbsd support --- linux/reboot.html | 232 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 232 insertions(+) create mode 100644 linux/reboot.html (limited to 'linux/reboot.html') diff --git a/linux/reboot.html b/linux/reboot.html new file mode 100644 index 0000000..1a4783b --- /dev/null +++ b/linux/reboot.html @@ -0,0 +1,232 @@ + + + + + 1.3. Boot + + + + Core OS Index + +

1.3. Boot

+ +

Follow this instructions with active chroot, + first mount partitions + and before chroot mount follow file systems;

+ + 
+        $ sudo mount --bind /dev $CHROOT/dev
+        $ sudo mount -vt devpts devpts $CHROOT/dev/pts
+        $ sudo mount -vt tmpfs shm $CHROOT/dev/shm
+        $ sudo mount -vt proc proc $CHROOT/proc
+        $ sudo mount -vt sysfs sysfs $CHROOT/sys
+
+ +

Now you can chroot;

+ + 
+        $ sudo chroot $CHROOT /usr/bin/env -i \
+          HOME=/root TERM="$TERM" PS1='\u:\w\$ ' \
+          PATH=/bin:/usr/bin:/sbin:/usr/sbin \
+          /bin/bash --login
+
+ +

1.3.1. Kernel

+ +

Install linux-gnu port, + linux libre kernel is a true source based kernel that + respects your freedoms. Read linux kernel + for more information.

+ +

Default crux configuration can be obtained from iso, + kernel port depend on dracut, grub2 + and grub2-efi. You don't need them to build with pkgmk, to install + boot related tools use prt-get;

+ + 
+	$ prt-get depinst linux-gnu
+
+ +

If you don't have the port binary package build it;

+ + 
+        # cd /usr/ports/machine-ports/linux-gnu
+        # pkgmk -d
+
+ +

Install kernel;

+ + 
+        # pkgadd /usr/ports/packages/linux-gnu#4.9.86-2.pkg.tar.gz
+
+ +

1.3.2. Dracut

+ +

Install dracut;

+ + 
+        # cd /usr/ports/machine-ports/dracut
+        # pkgmk -d
+        # pkgadd /usr/ports/packages/dracut#044-2.pkg.tar.gz
+
+ +

Review configuration file;

+ + 
+        # PUT YOUR CONFIG IN separate files
+        # in /etc/dracut.conf.d named ".conf"
+
+        # Equivalent to -H
+        hostonly="no"
+
+        # Mount / and /usr read-only by default.
+        ro_mnt="no"
+
+        # Equivalent to -m "module module module"
+        dracutmodules+="dash kernel-modules rootfs-block udev-rules usrmount base fs-lib shutdown"
+
+        # Equivalent to -a "module"
+        add_dracutmodules+="caps debug"
+
+        # Equivalent to -o "module"
+        #omit_dracutmodules+="systemd systemd-bootchart systemd-networkd systemd-initrd"
+
+        # SEE man dracut.conf(5) for options
+
+ +

Run dracut to create init ram filesystem for + port linux-blob kernel;

+ + 
+        # dracut --kver 4.9.86-gnu
+
+ +

1.3.3. Grub

+ +

Create grub file in /etc/default/grub with values;

+ + 
+        GRUB_DISABLE_LINUX_UUID=false
+        GRUB_ENABLE_LINUX_LABEL=false
+
+ +

Grub Manual, + install grub on MBR of disk sdb;

+ + 
+        # grub-install /dev/sdb
+        Installation finished. No error reported.
+
+ +

If you are installing on removable media;

+ + 
+        # grub-install --removable /dev/sdb
+        Installation finished. No error reported.
+
+ +

grub-mkconfig generates grub.cfg, it will try to discover + available kernels and attempt to generate menu entries for + them;

+ + 
+        # grub-mkconfig -o /boot/grub/grub.cfg
+        Generating grub.cfg ...
+        Found linux image: /boot/vmlinuz-4.9.86-gnu
+        Found initrd image: /boot/initramfs-4.9.86-gnu.img
+        done
+        #
+
+ +

Check /boot/grub/grub.cfg, if is wrong add menu to + /etc/grub.d/40_custom, replace correct partition from grub-prob + output and correct UUID from fstab or blkid

+ + 
+        # grub-probe --target=hints_string /
+
+ +

1.3.3.1. Rescue iso

+ +

Simple way to have "resque" system is to mount boot as read only, + this assures that even as root nothing can be changed without remount. + To have different system independent from host grub will have entry to + boot small iso on /boot partition;

+ +

Crux iso is not used because at the moment it fails to + find "crux-media" during or after init.

+ + 
+        $ wget http://ftp.nluug.nl/os/Linux/distr/tinycorelinux/7.x/x86/release/CorePlus-current.iso
+        $ sudo mv CorePlus-current.iso /boot/tinycore.iso
+
+ +

Edit /etc/grub.d/40_custom

+ + 
+
+        menuentry "Rescue" {
+            load_video
+            set gfxpayload=keep
+
+            set isofile="/tinycore.iso"
+            loopback loop $isofile
+            linux (loop)/boot/vmlinuz64 loglevel=3 cde
+            initrd (loop)/boot/corepure64.gz
+        }
+
+ +

1.3.4. Recover

+ +

Root password

+ +

On grub boot menu press e to edit boot options, change;

+ + 
+        linux   /vmlinuz-4.9.92-gnu root=UUID=3bab76f8-e714-45f1-8e30-04cc8a09c3d1 ro single
+
+ +

to;

+ + 
+        linux   /vmlinuz-4.9.92-gnu root=UUID=3bab76f8-e714-45f1-8e30-04cc8a09c3d1 ro init=/bin/bash
+
+ +

Boot and mount;

+ + 
+        # mount -a
+        # mount -o remount,rw /
+        # passwd root
+        # mount -o remount,ro /
+        # sync
+
+ +

Reboot computer using power / reset.

+ +

1.3.5. Checkup

+ +

If you have qemu installed you can see if it boots, in this + example sdb is usb external drive;

+ + 
+        # qemu-system-x86_64 -kernel /boot/vmlinuz-linux -initrd /boot/initramfs-linux.img -append root=/dev/sdb /dev/sdb2
+
+ +

Debug Grub

+ +

Debug initram

+ + 
+        /usr/lib/dracut/skipcpio /boot/initramfs-4.9.86-gnu.img | gunzip -c | cpio -i -d
+        36875 blocks
+
+ + Core OS Index +

This is part of the Tribu System Documentation. + Copyright (C) 2020 + Tribu Team. + See the file Gnu Free Documentation License + for copying conditions.

+ + -- cgit 1.4.1-2-gfad0