Core OS Index

1.4. Prepare for Reboot

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

1.4.1. Linux Kernel

Install kernel with default crux configuration using pkgutils;

        # cd /usr/ports/c9-ports/linux-crux
        # pkgmk -d
        # pkgadd /usr/ports/packages/linux-crux#4.1.30-1.pkg.tar.gz

1.4.2. Dracut - Initramfs

Install dracut;

        # cd /usr/ports/c9-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="yes"

        # 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;

        # dracut -v /boot/initramfs-4.1.30-crux.img 4.1.30-crux

1.4.3. Configuring Grub2

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-4.1.30-crux
        Found initrd image: /boot/initramfs-4.1.30-crux.img
        done
        #

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

        # grub-probe --target=hints_string /

To add rw as default edit /etc/grub.d/10_linux file, current version change line 138 to;

        echo    '$message'
        linux   ${rel_dirname}/${basename} root=${linux_root_device_thisversion} rw ${args}

1.4.4. 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-4.1.32-c9k9.img | gunzip -c | cpio -i -d
        36875 blocks

Core OS Index