Some computer manufacturers that pre-install Windows provide a Windows recovery/re-installation CD or DVD with the computer. External hard drives, USB flash drives, and multiple DVDs or CDs are all useful for this purpose. Instead, it is best to do a native install of Ubuntu, and then virtualize the other operating system.Īlthough this may seem obvious, it is important to back up your files to an external backup medium before attempting a dual-boot installation (or any other hard drive manipulation), in case your hard drive becomes corrupted during the process. better performance for a native install), it is not recommended. While there are some benefits to dual-booting (e.g. This page describes how to set up your computer in order to dual boot Ubuntu and Windows. Master Boot Record backup and replacement.Recovering GRUB after reinstalling Windows.Automatic partition resizing (not recommended).Have a Windows recovery CD/DVD available.Updated FreeBSD efi boot loader name and location to match new FreeBSD 13.0 defaults. This way it provides better performance and doesn't cause troubles with some programs, like Firefox on Wayland, for instance. Removed /tmp from ZFS datasets, to use a tmpfs /tmp instead. Added a note about FreeBSD's efi loader name used in this tutorial. Remember to modify them to reflect your own reality: Here I share some sample entries to guide you a bit. # Exit Shell Partitioning mode, so bsdinstall can continue and complete the installation:Īfter finishing the installation, don't forget to add a boot entry for FreeBSD in GRUB or rEFInd. # Copy FreeBSD loader to the previously created directory:Ĭp /boot/loader.efi /media/efi/freebsd/loader.efiĮfibootmgr -create -activate -label "FreeBSD" -loader "/media/efi/freebsd/loader.efi" # Create FreeBSD boot directory in the EFI partition: # Mount the existing EFI partition of your disk: Printf "tmpfs\t/tmp\ttmpfs\trw,mode=1777\t0\t0\n" > /tmp/bsdinstall_etc/fstab # Add an fstab entry to use tmpfs for /tmp: Printf "/dev/gpt/swap0.eli\tnone\tswap\tsw\t0\t0\n" > /tmp/bsdinstall_etc/fstab # Add an fstab entry to use a GELI-encrypted swap partition: Printf 'zfs_enable="YES"' > /tmp/bsdinstall_etc/rc.conf # Instruct FreeBSD to mount ZFS pools during system initialization: Zpool set bootfs=zroot/ROOT/default zroot Zfs create -o exec=off -o setuid=off zroot/var/log Zfs create -o exec=off -o setuid=off zroot/var/crash Zfs create -o exec=off -o setuid=off zroot/var/audit Zfs create -o mountpoint=/var -o canmount=off zroot/var Zfs create -o mountpoint=/usr -o canmount=off zroot/usr Zfs create -o mountpoint=/tmp -o exec=on -o setuid=off zroot/tmp # We'll be using tmpfs for /tmp. # Define the default ZFS datasets for root zpool: Zfs create -o mountpoint=/ zroot/ROOT/default Zpool create -f -o altroot=/mnt -O compress=lz4 -O atime=off -m none zroot /dev/gpt/zfs0 # Mount tmpfs in /mnt, where the installer will install the operating system to: Gpart add -a 4k -l zfs0 -t freebsd-zfs ada0 # Create a ZFS partition to fill the remaining free space: Gpart add -a 4k -l swap0 -s 4G -t freebsd-swap ada0 # Create a swap partition (in this case, of 4 GB size): Here, choose the "Shell" option, so you can create your swap and ZFS partitions by hand: Proceed installing as usual, until you reach the "Partitioning" stage. Anyway, do it at your own risk!įirst of all, boot your FreeBSD install USB stick. This tutorial is not an unsafe procedure if you understand what you're doing (especially in regards to selecting the correct disk where you want to install). Just gonna show you how the respective entries should look like in each case.Ħ) Finally, I'm not responsible for any problem or data loss you may experience. Neither will I explain how to alter the GRUB config. I personally recommend rEFInd, but I won't detail how to install it here. Run gpart show to be sure.Ĥ) We will create our ZFS Pool with "Stripe" as the Virtual Device type (vdev).ĥ) After completing installation, to be able to choose what OS to boot you'll need to either install rEFInd boot manager, or use GRUB (assuming the other OS is a Linux distro). Change it according to your setup, if needed. As always, make sure to disable Secure Boot and Fast Boot.ģ) Here, we use ada0 (disk 1) for everything, and we assume your disk already has an EFI partition, located in partition 1 (ada0p1). Legacy BIOS and MBR disks are not supported. Essentially, you will be installing FreeBSD with root-on-ZFS on the remaining free space of the disk, instead of using the entire drive as it's done by default by FreeBSD's installer.Ģ) This method only works for GPT disk layouts using UEFI mode. 1) This tutorial assumes you have the OS you want to dual-boot with already installed on your drive, and that you already have freed up some disk space.
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