Install CentOS 8. For more details, see Performing a standard installation. To copy the file to another location, use the file manager. Remember to change permissions on the copy, so that the file can be read by non-root users.
This tool will walk you through the basic configuration and enables you to download the resulting Kickstart file. Click the Go to Application button to the left of heading and wait for the next page to load.
Select CentOS 8 in the drop-down menu and wait for the page to update. You can use the ksverdiff command to display the differences between two versions of the Kickstart syntax. This is useful when updating an existing Kickstart file to be used with a new release. To display a list of changes in syntax between CentOS 6 and 7, use the following command:.
The -f option specifies the release to start the comparison with, and the -t option to specify the release to end with. For additional information, see the ksverdiff 1 man page. Normally, a Kickstart file is copied to removable media or a hard drive, or made available on the network. Placing the file in a network location complements the usual approach to Kickstart installations, which is also network-based: the system is booted using a PXE server, the Kickstart file is downloaded from a network share, and software packages specified in the file are downloaded from remote repositories.
Making the Kickstart file available and reachable from the installation system is exactly the same as making the installation source available, only with the Kickstart file instead of the installation ISO image or tree. For full procedures, see Preparing Installation Sources. The Kickstart installation must access an installation source in order to install the packages needed by your system. See Installation Source on a Hard Drive for details about using a hard drive as the installation source.
See Installation Source on a Network for details. To load your Kickstart file automatically without having to specify the inst. To start a Kickstart installation, use the boot option inst. When you configure the PXE server, you can add the boot option into the boot loader configuration file, which in turn allows you to start the installation automatically. Using this approach, it is possible to automate the installation completely, including the boot process.
Procedures in this section assume that you already have a Kickstart file ready in a location accessible from the installation system, as well as boot media or a PXE server which can be used to boot the system and begin the installation.
This section explains how to start a Kickstart installation manually, which means some user interaction adding boot options at the boot: prompt will be required. For architecture-specific instructions, see:. At the boot prompt, specify the inst.
In some cases, the inst. For details about boot options and valid syntax, see Boot Options. The installation begins now, using the options specified in the Kickstart file.
If the Kickstart file is valid and contains all required commands, the installation is completely automated from this point forward. The following procedure explains how to completely automate the Kickstart installation, using a network boot PXE server and a properly configured boot loader. If you follow this procedure, you only need to turn on the system; no other interaction will be required from that moment until the installation finishes.
Open the boot loader configuration file on your PXE server, and add the inst. In this case, add the inst. A sample append line in the configuration file looks similar to the following:.
In this file, append the inst. A sample kernel line in the configuration file will look similar to the following:. The installation begins now, using the installation options specified in the Kickstart file. If the Kickstart file is valid and contains all required commands, the installation is completely automated. In the example commands, options in square brackets [ ] are optional arguments for the command. Sets up the authentication options for the system using the authconfig command, which can also be run on the command line after the installation finishes.
See the authconfig 8 manual page and the authconfig --help command for more details. Passwords are shadowed by default. By default, --enablenis uses whatever domain it finds on the network. To use this option, you must install the nss-pam-ldapd package. To use this option, you must have the nss-pam-ldapd package installed.
If your environment does not use TLS Transport Layer Security , use the --disableldaptls switch to ensure that the resulting configuration file works. Kerberos itself does not know about home directories, UIDs, or shells. If you have multiple KDCs in your realm, use a comma-separated list without spaces. This server handles password changing and other administrative requests.
Hesiod is an extension of DNS that uses DNS records to store information about users, groups, and various other items. To look up user information for the user name jim , the Hesiod library looks up jim.
To look up groups, the Hesiod library looks up jim. To look up users and groups by number, make Note that the library does not place a period. Therefore, if the LHS and RHS values need to have a period placed in front of them, you must include the period in the values you set for --hesiodlhs and --hesiodrhs.
To specify more than one server, separate the names with commas ,. The nscd service caches information about users, groups, and various other types of information. Accepts the following values:. For a description of the available partition schemes, see File System Types x The available values are ext2 , ext3 , ext4 , xfs , and vfat. The default file system is xfs.
For information about these file systems, see File System Types x This is equivalent to checking the Encrypt partitions check box on the initial partitioning screen during a manual graphical installation. When encrypting one or more partitions, Anaconda attempts to gather bits of entropy to ensure the partitions are encrypted securely. Gathering entropy can take some time - the process will stop after a maximum of 10 minutes, regardless of whether sufficient entropy has been gathered.
The process can be sped up by interacting with the installation system typing on the keyboard or moving the mouse. If you are installing in a virtual machine, you can also attach a virtio-rng device a virtual random number generator to the guest as described in the Red Hat Enterprise Linux 7 Virtualization Deployment and Administration Guide.
The keys are stored as a separate file for each encrypted volume. This option is only meaningful if --encrypted is specified. This option is only meaningful if --escrowcert is specified. You must use this option together with the --encrypted option; by itself it has no effect. Available types of encryption are listed in the Red Hat Enterprise Linux 7 Security Guide , but CentOS strongly recommends using either aes-xts-plain64 or aes-cbc-essiv:sha The installation then proceeds successfully.
Normally, Kickstart installations skip unnecessary screens. This option makes the installation program step through every screen, displaying each briefly. This option should not be used when deploying a system because it can disrupt package installation.
Each screen is only captured right before the installer switches to the next one. This is important, because if you do not use all required Kickstart options and the installation therefore does not begin automatically, you can go to the screens which were not automatically configured, perform any configuration you want. Then, when you click Done to continue, the screen is captured including the configuration you just provided. CentOS recommends setting up a boot loader password on every system.
For example, instead of:. This way the command will always target the same storage device. This is especially useful in large storage environments. See the chapter about persistent storage device naming in the Red Hat Enterprise Linux 7 Storage Administration Guide for more in-depth information about different ways to consistently refer to storage devices. For more information, see Boot Loader Installation x To specify multiple parameters, separate them with spaces. For example:. This option is useful for disabling mechanisms which were implemented to mitigate the Meltdown and Spectre speculative execution vulnerabilities found in most modern processors CVE, CVE, and CVE In some cases, these mechanisms may be unnecessary, and keeping them enabled causes decreased performance with no improvement in security.
Ensure your system is not at risk of attack before disabling any of the vulnerability mitigation mechanisms. See the Red Hat vulnerability response article for information about the Meltdown and Spectre vulnerabilities.
Valid values are the following:. On a GPT-formatted disk, this option installs stage 1. On an MBR-formatted disk, stage 1. This should be used to restrict access to the GRUB2 shell, where arbitrary kernel options can be passed. If a password is specified, GRUB2 also asks for a user name. The user name is always root.
If you want to encrypt the password, use this option and an encrypted password. An example bootloader Kickstart entry with an encrypted password looks similar to the following:. This option only works on systems supported by extlinux. One or more partitions can be specified in partitions. When specifying more than one partitions, the entries must be separated by a single space. See Creating Btrfs Volumes and Subvolumes for a demonstration. This parameter is optional, has no meaning for subvolumes, and requires more than one physical disk.
This option has no meaning for subvolumes and requires more than one physical disk. If the given label is already in use by another file system, a new label is created. This option has no meaning for subvolumes. No processing is done on the list of arguments, so they must be supplied in a format that can be passed directly to the mkfs program.
This means multiple options should be comma-separated or surrounded by double quotes, depending on the filesystem. The main volume is not mounted or used directly in this example. Removes partitions from the system, prior to creation of new partitions. By default, no partitions are removed. If the clearpart command is used, then the part --onpart command cannot be used on a logical partition. For a detailed example of partitioning including the clearpart command, see Advanced Partitioning Example.
This option will erase all disks which can be reached by the installer, including any attached network storage. Use this option with caution. For example, the following clears all the partitions on the first two drives on the primary IDE controller:. Never specify multipath devices by device names like mpatha.
Device names such as this are not specific to a particular disk. Therefore, the clearpart command could target the wrong disk. Because --initlabel can see all disks, it is important to ensure only those drives that are to be formatted are connected.
This option overrides the --all and --linux options if used. Can be used across different drives. Using the clearpart --all command in a Kickstart file to remove all existing partitions during the installation can cause Anaconda to pause and prompt you for a confirmation in certain cases.
If you need to perform the installation automatically with no interaction, add the zerombr command to your Kickstart file. Perform the installation in a completely non-interactive command line mode. Any prompt for interaction halts the installation. If no mode is specified, the system will prompt you to choose one before continuing.
However, on older systems and some PCI systems, Kickstart requires a hint to find the proper devices. The device command, which tells the installation program to install extra modules, uses the following format:. Driver disks can be used during Kickstart installations to provide additional drivers not included by default.
Then, you must use the driverdisk command to specify that the installation program should look for a driver disk and its location. Driver disks can also be loaded from a hard disk drive or a similar device instead of being loaded over the network or from initrd. Follow this procedure:. Replace DD with a specific label and replace dd. Use anything supported by the inst. Specifying this option prevents Initial Setup from prompting you to accept the license agreement after you finish the installation and reboot the system for the first time.
See Initial Setup for more information. This option must always be used, otherwise the eula command is meaningless. If access to services running on this machine is needed, you can choose to allow specific services through the firewall.
To list more than one device, use --trust em1 --trust em2. Do NOT use a comma-separated format such as --trust em1, em2. For example, to allow IMAP access through your firewall, specify imap:tcp. Numeric ports can also be specified explicitly; for example, to allow UDP packets on port through, specify udp. To specify multiple ports, separate them by commas. Some services like cups , avahi , and so on.
Valid options are anything recognized by the firewall-offline-cmd program in the firewalld package. If firewalld is running, firewall-cmd --get-services provides a list of known service names. Determine whether the Initial Setup application starts the first time the system is booted. If enabled, the initial-setup package must be installed.
If not specified, this option is disabled by default. This mode enables the language, mouse, keyboard, root password, security level, time zone and networking configuration options in addition to the default ones. Creates a new user group on the system. If a group with the given name or GID already exists, this command fails.
In addition, the user command can be used to create a new group for the newly created user. If not provided, defaults to the next available non-system GID. Halt the system after the installation has successfully completed. This is similar to a manual installation, where Anaconda displays a message and waits for the user to press a key before rebooting.
During a Kickstart installation, if no completion method is specified, this option is used as the default. The halt command is equivalent to the shutdown -h command. For other completion methods, see the poweroff , reboot , and shutdown commands.
Causes the installation program to ignore the specified disks. This is useful if you use automatic partitioning and want to be sure that some disks are ignored.
For example, without ignoredisk , attempting to deploy on a SAN-cluster the Kickstart would fail, as the installation program detects passive paths to the SAN that return no partition table. All other disks are ignored. For example, to use disk sda during installation and ignore all other disks:. The default installation mode. The install command and the installation method command must be on separate lines.
The drive must contain a file system the installation program can mount: ext2 , ext3 , ext4 , vfat , or xfs. The image can be the squashfs. Supported file systems are ext2 , ext3 , ext4 , vfat , and xfs. When using the liveimg installation mode with a driver disk, drivers on the disk will not automatically be included in the installed system. Specifies additional iSCSI storage to be attached during installation. If you use the iscsi command, you must also assign a name to the iSCSI node, using the iscsiname command.
The iscsiname command must appear before the iscsi command in the Kickstart file. Anaconda automatically detects and uses disks configured in BIOS or firmware and no special configuration is necessary in the Kickstart file.
If you must use the iscsi command, ensure that networking is activated at the beginning of the installation, and that the iscsi command appears in the Kickstart file before you refer to iSCSI disks with commands such as clearpart or ignoredisk. Once used, it must be specified in all instances of the iscsi command in the entire Kickstart file. Assigns a name to an iSCSI node specified by the iscsi parameter.
If you use the iscsi parameter in your Kickstart file, you must specify iscsiname earlier in the Kickstart file. This command configures the kdump kernel crash dumping mechanism. The syntax for this command is unusual because it is an add-on rather than a built-in Kickstart command. For more information about add-ons, see Kickstart Add-ons.
In case of a system crash, kexec boots into a second kernel a capture kernel. This capture kernel resides in a reserved part of the system memory that is inaccessible to the first kernel. You can also specify auto instead of a numeric value. In that case, the installer will determine the amount of memory automatically based on the criteria described in the Red Hat Enterprise Linux 7 Kernel Crash Dump Guide. Accepts values in the same format as setxkbmap 1 , either in the layout format such as cz , or in the layout variant format such as cz qwerty.
All available layouts can be viewed on the xkeyboard-config 7 man page under Layouts. Multiple options must be separated by commas without spaces. Accepts values in the same format as setxkbmap 1.
Available switching options can be viewed on the xkeyboard-config 7 man page under Options. Sets the language to use during installation and the default language to use on the installed system. For example, to set the language to English, the Kickstart file should contain the following line:.
Certain languages for example, Chinese, Japanese, Korean, and Indic languages are not supported during text-mode installation. If you specify one of these languages with the lang command, the installation process continues in English, but the installed system uses your selection as its default language.
Takes the form of comma-separated list without spaces. Controls the error logging of Anaconda during installation. It has no effect on the installed system. All messages are still sent to the log file regardless of this level, however. Possible values are debug , info , warning , error , or critical.
This command uses the following syntax:. Do not use the dash - character in logical volume and volume group names when installing CentOS using Kickstart.
This limitation only applies to newly created logical volume and volume group names. You can create it by using the Kickstart Configurator application, or writing it from scratch.
The Red Hat Enterprise Linux installation program also creates a sample kickstart file based on the options that you selected during installation. You should be able to edit it with any text editor or word processor that can save files as ASCII text. First, be aware of the following issues when you are creating your kickstart file:. Sections must be specified in order.
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