Applies to SUSE Linux Enterprise Server 15 SP6

2 Installation on AMD64 and Intel 64 #

This chapter describes the steps necessary to prepare for the installation of SUSE Linux Enterprise Server on AMD64 and Intel 64 computers. It introduces the steps required to prepare for various installation methods. The list of hardware requirements provides an overview of systems supported by SUSE Linux Enterprise Server. Find information about available installation methods and several commonly known problems. Also learn how to control the installation, provide installation media, and boot with regular methods.

2.1 Hardware requirements #

The SUSE® Linux Enterprise Server operating system can be deployed on a wide range of hardware. It is impossible to list all the different combinations of hardware SUSE Linux Enterprise Server supports. However, to provide you with a guide to help you during the planning phase, the minimum requirements are presented here.

If you want to be sure that a given computer configuration will work, find out which platforms have been certified by SUSE. Find a list at https://www.suse.com/yessearch/.

CPU

Most CPUs available at the time of release are supported.

Maximum number of CPUs

The maximum number of CPUs supported by software design is 8192 for Intel 64 and AMD64. If you plan to use such a large system, verify with our hardware system certification Web page for supported devices, see https://www.suse.com/yessearch/.

Memory requirements

A minimum of 1024 MB of memory is required for a minimal installation. On machines with more than two processors, add 512 MB per CPU. For remote installations via HTTP or FTP, add another 150 MB. Note that these values are only valid for the installation of the operating system—the actual memory requirement in production depends on the system's workload. For systems running the GNOME desktop environment, a minimum of 2048 MB of memory is required and 4096 MB is recommended.

Hard disk requirements

The disk requirements depend largely on the installation selected and how you use your machine. Commonly, you need more space than the installation software itself needs to have a system that works properly. Minimum requirements for different selections are:

Installation Scope	Minimum Hard Disk Requirements
Text Mode	1.5 GB
Minimal System	2.5 GB
GNOME Desktop	3 GB
All patterns	4 GB
Recommended Minimum (no Btrfs snapshots): 10 GB
Required Minimum (with Btrfs snapshots): 16 GB
Recommended Minimum (with Btrfs snapshots): 32 GB

If your root partition is smaller than 10 GB, the installer will not make an automated partitioning proposal and you need to manually create partitions. Therefore the recommended minimum size for the root partition is 10 GB. If you want to enable Btrfs snapshots on the root volume to enable system rollbacks (see Chapter 10, System recovery and snapshot management with Snapper) the minimum size for the root partition is 16 GB.

Boot methods

The computer can be booted from a CD or a network. A special boot server is required to boot over the network. This can be set up with SUSE Linux Enterprise Server.

2.2 Installation considerations #

This section encompasses many factors that need to be considered before installing SUSE Linux Enterprise Server on AMD64 and Intel 64 hardware.

2.2.1 Installation on hardware or virtual machine #

SUSE Linux Enterprise Server is normally installed as an independent operating system. With virtualization it is also possible to run multiple instances of SUSE Linux Enterprise Server on the same hardware. However, the installation of the VM Host Server is performed like a typical installation with some additional packages. The installation of virtual guests is described in Chapter 10, Guest installation.

2.2.2 Installation target #

Most installations are to a local hard disk. Therefore, it is necessary for the hard disk controllers to be available to the installation system. If a special controller (like a RAID controller) needs an extra kernel module, provide a kernel module update disk to the installation system.

Other installation targets may be various types of block devices that provide sufficient disk space and speed to run an operating system. This includes network block devices like iSCSI or SAN. It is also possible to install on network file systems that offer the standard Unix permissions. However, it may be problematic to boot these, because they must be supported by the initramfs before the actual system can start. Such installations can be useful when you need to start the same system in different locations or you plan to use virtualization features like domain migration.

2.3 Installation methods #

You can choose the desired installation method by booting the setup with one of the options listed in Section 2.4, “Booting the system”. To enable the additional installation methods, refer to Section 8.3.4, “Specifying remote access”. For information about how to use remote installation methods, refer to Chapter 12, Remote installation.

A brief overview of the different methods:

Local with monitor and keyboard: This is the method most frequently used to install SUSE Linux Enterprise Server. This also requires very little preparation but needs a lot of direct interaction.
Remote via SSH: You can perform installation via SSH either in text mode or use X-forwarding for a graphical installation. For details, refer to Section 12.4, “Monitoring installation via SSH”.
Remote via serial console: For this installation method, you need a second computer connected via a null modem cable to the target computer. The installation is done in text mode. For details, refer to Section 12.5, “Installation via serial console”.
Remote via VNC: Use this method to perform the installation using a graphical interface without direct access to the target machine. For details, refer to Section 12.3, “Monitoring installation via VNC”.
Automatic via AutoYaST: To install SUSE Linux Enterprise Server on several computers with similar hardware, it is recommended you perform the installation using AutoYaST. In this case, start by installing one SUSE Linux Enterprise Server and use it to create the necessary AutoYaST configuration files. For details, refer to AutoYaST Guide.

2.4 Booting the system #

This section gives an overview of the steps required for the complete installation of SUSE® Linux Enterprise Server.

Unlike previous SLE products, the entire SLE 15 SP6 product line can be installed using the Unified Installer. For details about the changes since SUSE Linux Enterprise 15 and which media to download for installation, see Section 1.5, “Changes in installation from SUSE Linux Enterprise Server version 15”.

For a full description of how to install and configure the system with YaST, refer to Part II, “Installation procedure”.

Important: Hardware support updates

When using very recent hardware, it can be necessary to boot the installation with a newer kernel from a Kernel Update ISO image. For details, refer to Chapter 7, Installation on hardware not supported at release.

Prepare the installation media.
USB Flash Drive
This is the simplest way to start the installation. To create a bootable flash disk, you need to copy a DVD image to the device using the dd command. The flash disk must not be mounted, and all data on the device will be erased.
# dd if=PATH_TO_ISO_IMAGE of=USB_STORAGE_DEVICE bs=4M
Network booting
If the target computer's firmware supports it, you can boot the computer from the network and install from a server. This booting method requires a boot server that provides the needed boot images over the network. The exact protocol depends on your hardware. Commonly you need several services, such as TFTP and DHCP or PXE boot. For details, read Chapter 18, Preparing network boot environment.
It is possible to install from many common network protocols, such as NFS, HTTP, FTP, or SMB. For more information on how to perform such an installation, refer to Chapter 12, Remote installation.
Configure the target system firmware to boot the medium you chose. Refer to the documentation of your hardware vendor about how to configure the correct boot order.
Set the boot parameters required for your installation control method. An overview of the different methods is provided in Section 2.3, “Installation methods”. A list of boot parameters is available in Chapter 8, Boot parameters.
Perform the installation as described in Chapter 9, Installation steps. The system needs to restart after the installation is finished.
Optional: Change the boot order of the system to directly boot from the medium to which SUSE Linux Enterprise Server has been installed. If the system boots from the installation medium, the first boot parameter will be to boot the installed system.

2.5 Dealing with boot and installation problems #

Prior to delivery, SUSE® Linux Enterprise Server is subjected to an extensive test program. Despite this, problems occasionally occur during boot or installation.

2.5.1 Problems booting #

Boot problems may prevent the YaST installer from starting on your system. Another symptom is when your system does not boot after the installation has been completed.

System does not boot from installation media: Change your computer's firmware or BIOS so that the boot sequence is correct. To do this, consult the manual for your hardware.
The computer hangs: Change the console on your computer so that the kernel outputs are visible. Be sure to check the last outputs. This is normally done by pressing Ctrl–Alt–F10. If you cannot resolve the problem, consult the SUSE Linux Enterprise Server support staff. To log all system messages at boot time, use a serial connection as described in Section 2.3, “Installation methods”.
Boot disk: The boot disk is a useful interim solution if you have difficulties setting the other configurations or if you want to postpone the decision regarding the final boot mechanism. For more details on creating boot disks, see grub2-mkrescue.
Virus warning after installation: There are BIOS variants that check the structure of the boot sector (MBR) and erroneously display a virus warning after the installation of GRUB 2. Solve this problem by entering the BIOS and looking for corresponding adjustable settings. For example, switch off virus protection. You can switch this option back on again later. It is unnecessary, however, if Linux is the only operating system you use.

2.5.2 Problems installing #

If an unexpected problem occurs during installation, information is needed to determine the cause of the problem. Use the following directions to help with troubleshooting:

Check the outputs on the various consoles. You can switch consoles with the key combination Ctrl–Alt–Fn. For example, obtain a shell in which to execute various commands by pressing Ctrl–Alt–F2.
Try launching the installation with “Safe Settings” (press F5 on the installation screen and choose Safe Settings). If the installation works without problems in this case, there is an incompatibility that causes either ACPI or APIC to fail. In some cases, a BIOS or firmware update fixes this problem.
Check the system messages on a console in the installation system by entering the command dmesg -T.

2.5.3 Initiating installation instead of booting #

The default option in the boot menu of the installation source for SUSE Linux Enterprise Server boots the machine into the already installed system. To avoid this and to initiate the installation process instead, choose one of the available installation options in the boot menu.