Chapter 14. Boot options

This section contains information about some of the boot options that you can use to modify the default behavior of the installation program. For a full list of boot options, see the upstream boot option content.

14.1. Types of boot options

There are two types of boot options; those with an equals "=" sign, and those without an equals "=" sign. Boot options are appended to the boot command line and multiple options must be separated by a single space. Boot options that are specific to the installation program always start with inst.

Options with an equals "=" sign
You must specify a value for boot options that use the = symbol. For example, the inst.vncpassword= option must contain a value, in this case, a password. The correct syntax for this example is inst.vncpassword=password.
Options without an equals "=" sign
This boot option does not accept any values or parameters. For example, the rd.live.check option forces the installation program to verify the installation media before starting the installation. If this boot option is present, the verification is performed; if the boot option is not present, the verification is skipped.

14.2. Editing boot options

This section contains information about the different ways that you can edit boot options from the boot menu. The boot menu opens after you boot the installation media.

Editing the boot: prompt in BIOS

When using the boot: prompt, the first option must always specify the installation program image file that you want to load. In most cases, you can specify the image using the keyword. You can specify additional options according to your requirements.

Prerequisites

  • You have created bootable installation media (USB, CD or DVD).
  • You have booted the installation from the media, and the installation boot menu is open.

Procedure

  1. With the boot menu open, press the Esc key on your keyboard.
  2. The boot: prompt is now accessible.
  3. Press the Tab key on your keyboard to display the help commands.
  4. Press the Enter key on your keyboard to start the installation with your options. To return from the boot: prompt to the boot menu, restart the system and boot from the installation media again.
Note

The boot: prompt also accepts dracut kernel options. A list of options is available in the dracut.cmdline(7) man page.

Editing the > prompt

You can use the > prompt to edit predefined boot options. For example, select Test this media and install Red Hat Enterprise Linux 8.0.0 from the boot menu to display a full set of options.

Note

This procedure is for BIOS-based AMD64 and Intel 64 systems.

Prerequisites

  • You have created bootable installation media (USB, CD or DVD).
  • You have booted the installation from the media, and the installation boot menu is open.

Procedure

  1. From the boot menu, select an option and press the Tab key on your keyboard. The > prompt is accessible and displays the available options.
  2. Append the options that you require to the > prompt.
  3. Press the Enter key on your keyboard to start the installation.
  4. Press the Esc key on your keyboard to cancel editing and return to the boot menu.

Editing the GRUB2 menu

The GRUB2 menu is available on UEFI-based AMD64, Intel 64, and 64-bit ARM systems.

Prerequisites

  • You have created bootable installation media (USB, CD or DVD).
  • You have booted the installation from the media, and the installation boot menu is open.

Procedure

  1. From the boot menu window, select an option and press the e key on your keyboard.
  2. When you finish editing, press F10 or Ctrl+X on your keyboard to start the installation using the specified options.

14.3. Installation source boot options

This section contains information about the various installation source boot options.

inst.repo=

The inst.repo= boot option specifies the installation source, that is, the location providing the package repositories and a valid .treeinfo file that describes them. For example: inst.repo=cdrom. The target of the inst.repo= option must be one of the following installation media:

  • an installable tree, which is a directory structure containing the installation program images, packages, and repository data as well as a valid .treeinfo file
  • a DVD (a physical disk present in the system DVD drive)
  • an ISO image of the full Red Hat Enterprise Linux installation DVD, placed on a hard drive or a network location accessible to the system.

    You can use the inst.repo= boot option to configure different installation methods using different formats. The following table contains details of the inst.repo= boot option syntax:

    Table 14.1. inst.repo= installation source boot options

    Source typeBoot option formatSource format

    CD/DVD drive

    inst.repo=cdrom[:device]

    Installation DVD as a physical disk. [a]

    Installable tree

    inst.repo=hd:device:/path

    Image file of the installation DVD, or an installation tree, which is a complete copy of the directories and files on the installation DVD.

    NFS Server

    inst.repo=nfs:[options:]server:/path

    Image file of the installation DVD. [b]

    HTTP Server

    inst.repo=http://host/path

    Installation tree, which is a complete copy of the directories and files on the installation DVD.

    HTTPS Server

    inst.repo=https://host/path

    FTP Server

    inst.repo=ftp://username:password@host/path

    HMC

    inst.repo=hmc

     
    [a] If device is left out, installation program automatically searches for a drive containing the installation DVD.
    [b] The NFS Server option uses NFS protocol version 3 by default. To use a different version X, add +nfsvers=X to options.
    Note

    The NFS Server option uses NFS protocol version 3 by default. To use a different version, add +nfsvers=X to the option.

    You can set disk device names with the following formats:

  • Kernel device name, for example /dev/sda1 or sdb2
  • File system label, for example LABEL=Flash or LABEL=RHEL8
  • File system UUID, for example UUID=8176c7bf-04ff-403a-a832-9557f94e61db

    Non-alphanumeric characters must be represented as \xNN, where NN is the hexadecimal representation of the character. For example, \x20 is a white space (" ").

inst.addrepo=

Use the inst.addrepo= boot option to add an additional repository that can be used as another installation source along with the main repository (inst.repo=). You can use the inst.addrepo= boot option multip le times during one boot. The following table contains details of the inst.addrepo= boot option syntax.

Note

The REPO_NAME is the name of the repository and is required in the installation process. These repositories are only used during the installation process; they are not installed on the installed system.

Table 14.2. inst.addrepo installation source boot options

Installation sourceBoot option formatAdditional information

Installable tree at a URL

inst.addrepo=REPO_NAME,[http,https,ftp]://<host>/<path>

Looks for the installable tree at a given URL.

Installable tree at an NFS path

inst.addrepo=REPO_NAME,nfs://<server>:/<path>

Looks for the installable tree at a given NFS path. A colon is required after the host. The installation program passes every thing after nfs:// directly to the mount command instead of parsing URLs according to RFC 2224.

Installable tree in the installation environment

inst.addrepo=REPO_NAME,file://<path>

Looks for the installable tree at the given location in the installation environment. To use this option, the repositor y must be mounted before the installation program attempts to load the available software groups. The benefit of this option is that you can have multiple repositories on one bootable ISO, and you can install both the main repository and additional repositories from the ISO. The path to the additional repositories is /run/install/source/REPO_ISO_PATH. Additional, you can mount the repository directory in the %pre secti on in the Kickstart file. The path must be absolute and start with /, for example inst.addrepo=REPO_NAME,file:///<path>

Hard Drive

inst.addrepo=REPO_NAME,hd:<device>:<path>

Mounts the given <device> partition and installs from the ISO that is specified by the <path>. If the <path> is not specified, the installation p rogram looks for a valid installation ISO on the <device>. This installation method requires an ISO with a valid installable tree.

inst.noverifyssl=
The noverifyssl= boot option prevents the installation program from verifying the SSL certificate for all HTTPS connections with the exception of the additional Kickstart repositories, where --noverifyssl can be set per repository.
inst.stage2=

Use the inst.stage2= boot option to specify the location of the installation program runtime image. This option expects a path to a directory containing a valid .treeinfo file. The location of the runtime image is read from the .treeinfo file. If the .treeinfo file is not available, the installation program attempts to load the image from LiveOS/squashfs.img.

When the inst.stage2 option is not specified, the installation program attempts to use the location specified with inst.repo option.

You should specify this option only for PXE boot. The installation DVD and Boot ISO already contain a correct inst.stage2 option to boot the installation program from themselves.

Note

By default, the inst.stage2= boot option is used on the installation media and is set to a specific label, for example, inst.stage2=hd:LABEL=RHEL-8-0-0-BaseOS-x86_64. If you modify the default label of the file system containing the runtime image, or if you use a customized procedure to boot the installation system, you must verify that the inst.stage2= boot option is set to the correct value.

inst.stage2.all

The inst.stage2.all boot option is used to specify several HTTP, HTTPS, or FTP sources. You can use the inst.stage2= boot option multiple times with the inst.stage2.all option to fetch the image from the sources sequentially until one succeeds. For example:

inst.stage2.all
inst.stage2=http://hostname1/path_to_install_tree/
inst.stage2=http://hostname2/path_to_install_tree/
inst.stage2=http://hostname3/path_to_install_tree/
inst.dd=
The inst.dd= boot option is used to perform a driver update during the installation. See the Performing an advanced RHEL installation document for information on how to update drivers during installation.
inst.repo=hmc
When booting from a Binary DVD, the installation program prompts you to enter additional kernel parameters. To set the DVD as an installation source, append inst.repo=hmc to the kernel parameters. The installation program then enables SE and HMC file access, fetches the images for stage2 from the DVD, and provides access to the packages on the DVD for software selection. This option eliminates the requirement of an external network setup and expands the installation options.
inst.proxy

The inst.proxy boot option is used when performing an installation from a HTTP, HTTPS, FTP source. For example:

[PROTOCOL://][USERNAME[:PASSWORD]@]HOST[:PORT]
inst.nosave

Use the inst.nosave boot option to control which installation logs and related files are not saved to the installed system, for example input_ks, output_ks, all_ks, logs and all. Multiple values can be combined as a comma-separated list, for example: input_ks,logs.

Note

The inst.nosave boot option is used for excluding files from the installed system that can’t be removed by a Kickstart %post script, such as logs and input/output Kickstart results.

Table 14.3. inst.nosave boot options

OptionDescription

input_ks

Disables the ability to save the input Kickstart results.

output_ks

Disables the ability to save the output Kickstart results generated by the installation program.

all_ks

Disables the ability to save the input and output Kickstart results.

logs

Disables the ability to save all installation logs.

all

Disables the ability to save all Kickstart results, and all logs.

inst.multilib
Use the inst.multilib boot option to set DNF’s multilib_policy to all, instead of best.
memcheck
The memcheck boot option performs a check to verify that the system has enough RAM to complete the installation. If there isn’t enough RAM, the installation process is stopped. The system check is approximate and memory usage during installation depends on the package selection, user interface, for example graphical or text, and other parameters.
nomemcheck
The nomemcheck boot option does not perform a check to verify if the system has enough RAM to complete the installation. Any attempt to perform the installation with less than the recommended minimum amount of memory is unsupported, and might result in the installation process failing.

14.4. Network boot options

This section contains information about commonly used network boot options.

Note

Initial network initialization is handled by dracut. For a complete list, see the dracut.cmdline(7) man page.

ip=

Use the ip= boot option to configure one or more network interfaces. To configure multiple interfaces, you can use the ip option multiple times, once for each interface; to do so, you must use the rd.neednet=1 option, and you must specify a primary boot interface using the bootdev option. Alternatively, you can use the ip option once, and then use Kickstart to set up further interfaces. This option accepts several different formats. The following tables contain information about the most common options.

Note

In the following tables:

  • The ip parameter specifies the client IP address. You can specify IPv6 addresses in square brackets, for example, [2001:DB8::1].
  • The gateway parameter is the default gateway. IPv6 addresses are also accepted.
  • The netmask parameter is the netmask to be used. This can be either a full netmask (for example, 255.255.255.0) or a prefix (for example, 64).
  • The hostname parameter is the host name of the client system. This parameter is optional.

Table 14.4. Network interface configuration boot option formats

Configuration methodBoot option format

Automatic configuration of any interface

ip=method

Automatic configuration of a specific interface

ip=interface:method

Static configuration

ip=ip::gateway:netmask:hostname:interface:none

Automatic configuration of a specific interface with an override

ip=ip::gateway:netmask:hostname:interface:method:mtu

Note

The method automatic configuration of a specific interface with an override brings up the interface using the specified method of automatic configuration, such as dhcp, but overrides the automatically-obtained IP address, gateway, netmask, host name or other specified parameters. All parameters are optional, so specify only the parameters that you want to override.

The method parameter can be any of the following:

Table 14.5. Automatic interface configuration methods

Automatic configuration methodValue

DHCP

dhcp

IPv6 DHCP

dhcp6

IPv6 automatic configuration

auto6

iSCSI Boot Firmware Table (iBFT)

ibft

Note
  • If you use a boot option that requires network access, such as inst.ks=http://host:/path, without specifying the ip option, the installation program uses ip=dhcp.
  • To connect to an iSCSI target automatically, you must activate a network device for accessing the target. The recommended way to activate a network is to use the ip=ibft boot option.
nameserver=
The nameserver= option specifies the address of the name server. You can use this option multiple times.
bootdev=
The bootdev= option specifies the boot interface. This option is mandatory if you use more than one ip option.
ifname=

The ifname= options assigns an interface name to a network device with a given MAC address. You can use this option multiple times. The syntax is ifname=interface:MAC. For example:

ifname=eth0:01:23:45:67:89:ab
Note

The ifname= option is the only supported way to set custom network interface names during installation.

inst.dhcpclass=
The inst.dhcpclass= option specifies the DHCP vendor class identifier. The dhcpd service sees this value as vendor-class-identifier. The default value is anaconda-$(uname -srm).
inst.waitfornet=
Using the inst.waitfornet=SECONDS boot option causes the installation system to wait for network connectivity before installation. The value given in the SECONDS argument specifies the maximum amount of time to wait for network connectivity before timing out and continuing the installation process even if network connectivity is not present.

Additional resources

14.5. Console boot options

This section contains information about configuring boot options for your console, monitor display, and keyboard.

console=
Use the console= option to specify a device that you want to use as the primary console. For example, to use a console on the first serial port, use console=ttyS0. Use this option in conjunction with the inst.text option. You can use the console= option multiple times. If you do, the boot message is displayed on all specified consoles, but only the last one is used by the installation program. For example, if you specify console=ttyS0 console=ttyS1, the installation program uses ttyS1.
inst.lang=
Use the inst.lang= option to set the language that you want to use during the installation. The locale -a | grep _ or localectl list-locales | grep _ options return a list of locales.
inst.singlelang
Use the inst.singlelang option to install in single language mode, which results in no available interactive options for the installation language and language support configuration. If a language is specified using the inst.lang boot option or the lang Kickstart command, then it is used. If no language is specified, the installation program defaults to en_US.UTF-8.
inst.geoloc=

Use the inst.geoloc= option to configure geolocation usage in the installation program. Geolocation is used to preset the language and time zone, and uses the following syntax: inst.geoloc=value. The value can be any of the following parameters:

Table 14.6. Values for the inst.geoloc boot option

ValueBoot option format

Disable geolocation

inst.geoloc=0

Use the Fedora GeoIP API

inst.geoloc=provider_fedora_geoip

Use the Hostip.info GeoIP API

inst.geoloc=provider_hostip

If you do not specify the inst.geoloc= option, the installation program uses provider_fedora_geoip.

inst.keymap=
Use the inst.keymap= option to specify the keyboard layout that you want to use for the installation.
inst.cmdline
Use the inst.cmdline option to force the installation program to run in command-line mode. This mode does not allow any interaction, and you must specify all options in a Kickstart file or on the command line.
inst.graphical
Use the inst.graphical option to force the installation program to run in graphical mode. This mode is the default.
inst.text
Use the inst.text option to force the installation program to run in text mode instead of graphical mode.
inst.noninteractive
Use the inst.noninteractive boot option to run the installation program in a non-interactive mode. User interaction is not permitted in the non-interactive mode, and inst.noninteractive can be used with a graphical or text installation. When the inst.noninteractive option is used in text mode it behaves the same as the inst.cmdline option.
inst.resolution=
Use the inst.resolution= option to specify the screen resolution in graphical mode. The format is NxM, where N is the screen width and M is the screen height (in pixels). The lowest supported resolution is 1024x768.
inst.vnc=
Use the inst.vnc= option to run the graphical installation using VNC. You must use a VNC client application to interact with the installation program. When VNC sharing is enabled, multiple clients can connect. A system installed using VNC starts in text mode.
inst.vncpassword=
Use the inst.vncpassword= option to set a password on the VNC server that is used by the installation program.
inst.vncconnect=
Use the inst.vncconnect= option to connect to a listening VNC client at the given host location. For example inst.vncconnect=<host>[:<port>] The default port is 5900. This option can be used with vncviewer -listen.
inst.xdriver=
Use the inst.xdriver= option to specify the name of the X driver that you want to use both during installation and on the installed system.
inst.usefbx=
Use the inst.usefbx option to prompt the installation program to use the frame buffer X driver instead of a hardware-specific driver. This option is equivalent to inst.xdriver=fbdev.
modprobe.blacklist=

Use the modprobe.blacklist= option to blacklist or completely disable one or more drivers. Drivers (mods) that you disable using this option cannot load when the installation starts, and after the installation finishes, the installed system retains these settings. You can find a list of the blacklisted drivers in the /etc/modprobe.d/ directory. Use a comma-separated list to disable multiple drivers. For example:

modprobe.blacklist=ahci,firewire_ohci
inst.xtimeout=
Use the inst.xtimeout= option to specify the timeout in seconds for starting X server.
inst.sshd

Use the inst.sshd option to start the sshd service during installation, so that you can connect to the system during the installation using SSH, and monitor the installation progress. For more information about SSH, see the ssh(1) man page. By default, the sshd option is automatically started only on the IBM Z architecture. On other architectures, sshd is not started unless you use the inst.sshd option.

Note

During installation, the root account has no password by default. You can set a root password during installation with the sshpw Kickstart command.

inst.kdump_addon=
Use the inst.kdump_addon= option to enable or disable the Kdump configuration screen (add-on) in the installation program. This screen is enabled by default; use inst.kdump_addon=off to disable it. Disabling the add-on disables the Kdump screens in both the graphical and text-based interface as well as the %addon com_redhat_kdump Kickstart command.

14.6. Debug boot options

This section contains information about the options that you can use when debugging issues.

inst.rescue=
Use the inst.rescue= option to run the rescue environment. The option is useful for trying to diagnose and fix systems.
inst.updates=

Use the inst.updates= option to specify the location of the updates.img file that you want to apply during installation. There are a number of sources for the updates.

Table 14.7. inst.updates= source updates

SourceDescriptionExample

Updates from a network

The easiest way to use inst.updates= is to specify the network location of updates.img. This does not require any modification to the installation tree. To use this method, edit the kernel command line to include inst.updates.

inst.updates=http://some.website.com/path/to/updates.img.

Updates from a disk image

You can save an updates.img on a floppy drive or a USB key. This can be done only with an ext2 filesystem type of updates.img. To save the contents of the image on your floppy drive, insert the floppy disc and run the command.

dd if=updates.img of=/dev/fd0 bs=72k count=20. To use a USB key or flash media, replace /dev/fd0 with the device name of your USB key.

Updates from an installation tree

If you are using a CD, hard drive, HTTP, or FTP install, you can save the updates.img in the installation tree so that all installations can detect the .img file. Save the file in the images/ directory. The file name must be updates.img.

For NFS installs, there are two options: You can either save the image in the images/ directory, or in the RHupdates/ directory in the installation tree.

inst.loglevel=
Use the inst.loglevel= option to specify the minimum level of messages logged on a terminal. This concerns only terminal logging; log files always contain messages of all levels. Possible values for this option from the lowest to highest level are: debug, info, warning, error and critical. The default value is info, which means that by default, the logging terminal displays messages ranging from info to critical.
inst.syslog=
When installation starts, the inst.syslog= option sends log messages to the syslog process on the specified host. The remote syslog process must be configured to accept incoming connections.
inst.virtiolog=
Use the inst.virtiolog= option to specify the virtio port (a character device at /dev/virtio-ports/name) that you want to use for forwarding logs. The default value is org.fedoraproject.anaconda.log.0; if this port is present, it is used.
inst.zram
The inst.zram option controls the usage of zRAM swap during installation. The option creates a compressed block device inside the system RAM and uses it for swap space instead of the hard drive. This allows the installation program to run with less available memory than is possible without compression, and it might also make the installation faster. By default, swap on zRAM is enabled on systems with 2 GiB or less RAM, and disabled on systems with more than 2 GiB of memory. You can use this option to change this behavior; on a system with more than 2 GiB RAM, use inst.zram=1 to enable the feature, and on systems with 2 GiB or less memory, use inst.zram=0 to disable the feature.
rd.live.ram
If the rd.live.ram option is specified, the stage 2 image is copied into RAM. Using this option when the stage 2 image is on an NFS server increases the minimum required memory by the size of the image by roughly 500 MiB.
inst.nokill
The inst.nokill option is a debugging option that prevents the installation program from rebooting when a fatal error occurs, or at the end of the installation process. Use the inst.nokill option to capture installation logs which would be lost upon reboot.
inst.noshell
Use inst.noshell option if you do not want a shell on terminal session 2 (tty2) during installation.
inst.notmux
Use inst.notmux option if you do not want to use tmux during installation. The output is generated without terminal control characters and is meant for non-interactive uses.
remotelog
You can use the remotelog option to send all of the logs to a remote host:port using a TCP connection. The connection is retired if there is no listener and the installation proceeds as normal.

14.7. Storage boot options

inst.nodmraid=
Use the inst.nodmraid= option to disable dmraid support.
Warning

Use this option with caution. If you have a disk that is incorrectly identified as part of a firmware RAID array, it might have some stale RAID metadata on it that must be removed using the appropriate tool, for example, dmraid or wipefs.

inst.nompath=
Use the inst.nompath= option to disable support for multipath devices. This option can be used for systems on which a false-positive is encountered which incorrectly identifies a normal block device as a multipath device. There is no other reason to use this option.
Warning

Use this option with caution. You should not use this option with multipath hardware. Using this option to attempt to install to a single path of a multipath is not supported.

inst.gpt
The inst.gpt boot option forces the installation program to install partition information to a GUID Partition Table (GPT) instead of a Master Boot Record (MBR). This option is not valid on UEFI-based systems, unless they are in BIOS compatibility mode. Normally, BIOS-based systems and UEFI-based systems in BIOS compatibility mode attempt to use the MBR schema for storing partitioning information, unless the disk is 232 sectors in size or larger. Disk sectors are typically 512 bytes in size, meaning that this is usually equivalent to 2 TiB. Using the inst.gpt boot option changes this behavior, allowing a GPT to be written to smaller disks.

14.8. Kickstart boot options

This section contains information about the Kickstart boot options.

inst.ks=

Use the inst.ks= boot option to define the location of a Kickstart file that you want to use to automate the installation. You can then specify locations using any of the inst.repo formats. If you specify a device and not a path, the installation program looks for the Kickstart file in /ks.cfg on the device that you specify. If you use this option without specifying a device, the installation program uses the following option:

inst.ks=nfs:next-server:/filename

In the previous example, next-server is the DHCP next-server option or the IP address of the DHCP server itself, and filename is the DHCP filename option, or /kickstart/. If the given file name ends with the / character, ip-kickstart is appended. The following table contains an example.

Table 14.8. Default Kickstart file location

DHCP server addressClient addressKickstart file location

192.168.122.1

192.168.122.100

192.168.122.1:/kickstart/192.168.122.100-kickstart

If a volume with a label of OEMDRV is present, the installation program attempts to load a Kickstart file named ks.cfg. If your Kickstart file is in this location, you do not need to use the inst.ks= boot option.

inst.ks.all
Specify this option to sequentially try multiple Kickstart file locations provided by multiple inst.ks options. The first successful location is used. This applies only to locations of type http, https or ftp, other locations are ignored.
inst.ks.sendmac

Use the inst.ks.sendmac option to add headers to outgoing HTTP requests that contain the MAC addresses of all network interfaces. For example:

X-RHN-Provisioning-MAC-0: eth0 01:23:45:67:89:ab

This can be useful when using inst.ks=http to provision systems.

inst.ks.sendsn

Use the inst.ks.sendsn option to add a header to outgoing HTTP requests. This header contains the system serial number, read from /sys/class/dmi/id/product_serial. The header has the following syntax:

X-System-Serial-Number: R8VA23D

Additional resources

14.9. Advanced installation boot options

This section contains information about advanced installation boot options.

inst.kexec

The inst.kexec option allows the installation program to use the kexec system call at the end of the installation, instead of performing a reboot. The inst.kexec option loads the new system immediately, and bypasses the hardware initialization normally performed by the BIOS or firmware.

Important

This option is deprecated and available as a Technology Preview only. For information on Red Hat scope of support for Technology Preview features, see the Technology Preview Features Support Scope document.

When kexec is used, device registers which would normally be cleared during a full system reboot, might stay filled with data, which could potentially create issues for some device drivers.

inst.multilib

Use the inst.multilib boot option to configure the system for multilib packages, that is, to allow installing 32-bit packages on a 64-bit AMD64 or Intel 64 system. Normally, on an AMD64 or Intel 64 system, only packages for this architecture (marked as x86_64) and packages for all architectures (marked as noarch) are installed. When you use the inst.multilib boot option, packages for 32-bit AMD or Intel systems (marked as i686) are automatically installed.

This applies only to packages directly specified in the %packages section. If a package is installed as a dependency, only the exact specified dependency is installed. For example, if you are installing the bash package which depends on the glibc package, the former is installed in multiple variants, while the latter is installed only in variants that the bash package requires.

selinux=0

By default, the selinux=0 boot option operates in permissive mode in the installation program, and in enforcing mode in the installed system. The selinux=0 boot option disables the use of SELinux in the installation program and the installed system.

Note

The selinux=0 and inst.selinux=0 options are not the same. The selinux=0 option disables the use of SELinux in the installation program and the installed system. The inst.selinux=0 option disables SELinux only in the installation program. By default, SELinux operates in permissive mode in the installation program, so disabling SELinux has little effect.

inst.nonibftiscsiboot=
Use the inst.nonibftiscsiboot= boot option to place the boot loader on iSCSI devices that were not configured in the iSCSI Boot Firmware Table (iBFT).

14.10. Deprecated boot options

This section contains information about deprecated boot options. These options are still accepted by the installation program but they are deprecated and are scheduled to be removed in a future release of Red Hat Enterprise Linux.

method
The method option is an alias for inst.repo.
repo=nfsiso
The repo=nfsiso: option is the same as inst.repo=nfs:.
dns
Use nameserver instead of dns. Note that nameserver does not accept comma-separated lists; use multiple nameserver options instead.
netmask, gateway, hostname
The netmask, gateway, and hostname options are provided as part of the ip option.
ip=bootif
A PXE-supplied BOOTIF option is used automatically, so there is no requirement to use ip=bootif.
ksdevice

Table 14.9. Values for the ksdevice boot option

ValueInformation

Not present

N/A

ksdevice=link

Ignored as this option is the same as the default behavior

ksdevice=bootif

Ignored as this option is the default if BOOTIF= is present

ksdevice=ibft

Replaced with ip=ibft. See ip for details

ksdevice=<MAC>

Replaced with BOOTIF=${MAC/:/-}

ksdevice=<DEV>

Replaced with bootdev

14.11. Removed boot options

This section contains the boot options that have been removed from Red Hat Enterprise Linux.

Note

dracut provides advanced boot options. For more information about dracut, see the dracut.cmdline(7) man page.

askmethod, asknetwork
initramfs is completely non-interactive, so the askmethod and asknetwork options have been removed. Instead, use inst.repo or specify the appropriate network options.
blacklist, nofirewire
The modprobe option handles blacklisting kernel modules; use modprobe.blacklist=<mod1>,<mod2>. You can blacklist the firewire module by using modprobe.blacklist=firewire_ohci.
inst.headless=
The headless= option specified that the system that is being installed to does not have any display hardware, and that the installation program is not required to look for any display hardware.
inst.decorated
The inst.decorated option was used to specify the graphical installation in a decorated window. By default, the window is not decorated, so it doesn’t have a title bar, resize controls, and so on. This option was no longer required.
serial
Use the console=ttyS0 option.
updates
Use the inst.updates option.
essid, wepkey, wpakey
Dracut does not support wireless networking.
ethtool
This option was no longer required.
gdb
This option was removed as there are many options available for debugging dracut-based initramfs.
inst.mediacheck
Use the dracut option rd.live.check option.
ks=floppy
Use the inst.ks=hd:<device> option.
display
For a remote display of the UI, use the inst.vnc option.
utf8
This option was no longer required as the default TERM setting behaves as expected.
noipv6
ipv6 is built into the kernel and cannot be removed by the installation program. You can disable ipv6 using ipv6.disable=1. This setting is used by the installed system.
upgradeany
This option was no longer required as the installation program no longer handles upgrades.