# Installation

## Minimal HW/VM Requirements
- 4GB RAM
- 33GB Disk

## Network Installation

The machine you want to install needs to be [registered in `sysdb`](../admin-guide/deployment/sample). If you don't have the bob command installed locally you can login to __lxsup.psi.ch__ to use it. Remember that you need a valid Kerberos ticket before modifying a sysdb entry via `bob`.
More details regaring `bob` can be found [here](https://git.psi.ch/linux-infra/bob).

Optional you can set `netboot` and RHEL 8 installer but that can also be selected manually in be boot menu:

```
bob node netboot $FQDN
bob node set-attr $FQDN ipxe_installer=rhel8install
```



### Installation with UEFI
Start the machine and select network boot (if not already the default), then you get following menu:  
![Grub default menu](_static/installation_grub_default.png)

There select "Install Red Hat Enterprise Linux 8.7"
![Grub menu selection for iPXE](_static/installation_grub_select.png)  


__NOTE:__ After the installation the boot order will be changed to localboot again! So if you reinstall make sure that you re-set the bootorder via the efi menu or the commandline: https://linux.die.net/man/8/efibootmgr
```
[root@lx-test-02 ~]# efibootmgr
BootCurrent: 0004
BootOrder: 0004,0002,0000,0001,0003
Boot0000* EFI Virtual disk (0.0)
Boot0001* EFI VMware Virtual SATA CDROM Drive (0.0)
Boot0002* EFI Network
Boot0003* EFI Internal Shell (Unsupported option)
Boot0004* Red Hat Enterprise Linux

[root@lx-test-02 ~]# efibootmgr --bootorder 2,4,0,1,3
```
(there is no need to have the leading 000 )

### Installation with Legacy BIOS 
Start the machine and select network boot (if not already the default), then you get following menu, where the default depends on the `sysdb` configuration, but you may override it manualy:

![select RHEL 8 installation](_static/installation_ipxe_select_rhel8.png)