Preparación para la instalación

Este capítulo describe los pasos que necesita tomar antes de empezar la instalación. No se deben seguir los pasos estrictamente - por ejemplo, si usted planea usar los ajustes de instalación predeterminados, no necesita recoger información del sistema como etiquetas/UUIDs, del dispositivo de disco o información de la red como la dirección IP del sistema. Sin embargo, debería continuar con este capitulo, puesto que también describe los tipos de medio de instalación disponibles y como preparar el medio de arranque y las fuentes de la instalación.

¿Modernizar o Instalar?

Si usted ya tiene instalado Fedora y desea modernizar su instalación a la versión actual, hay dos maneras básicas de hacerlo:

La modernización automática usando dnf system upgrade

La manera preferida de modernizar su sistema es una modernización automática usando la utilidad dnf system upgrade. Para información sobre llevar a cabo una modernización automática, vea Fedora Wiki dnf system upgrade.

Reinstalación manual

Usted puede modernizar a la última versión de Fedora manualmente en lugar de confiar en dnf system upgrade. Esto implica iniciar el instalador como si estuviera llevando a cabo una instalación limpia, dejándole detectar su sistema Fedora existente y sobreescribiendo la partición root a la vez que preserva los datos en las otras particiones y volúmenes. El mismo procedimiento se puede usar para reinstala el sistema, si lo necesita. Para información detallada, vea Modernización Manual del Sistema o Reinstalación.

Haga siempre copia de seguridad de sus datos antes de llevar a cabo una actualización o reinstalación en su sistema, no importa el método que elija.

Preparar Medios de Arranque

Las imágenes Fedora son ISOs Híbridos y pueden ser usadas para crear medios de instalación tanto en discos ópticos como USB, para arrancar en sistemas tanto BIOS como UEFI.

Escritor de Medios Fedora

Fedora Media Writer has been significantly improved and is now the official, tested and supported way to make bootable media. Fedora Media Writer supports Linux, Mac, and Windows. It is an easy way to make bootable USB media to install Fedora (or other operating systems). Using Fedora Media Writer is strongly encouraged, although other USB media creation software can work as well.

Some of the new additions to Fedora Media Writer are that Fedora Workstation and Server are easily and quickly accessible from the selection on the main screen. Further choices are available if you select the button below Custom OS. This offers a selection of various Fedora Spins, such as XFCE or Mate.

Históricamente, las herramientas universales de creación de USB, como Unetbootin, eran una manera popular de crear instaladores USB desde ISOs destinados a medios ópticos. Ellos normalmente crean un sistema de archivos sobre el dispositivo USB extrayendo archivos de la imagen y escribiendo el cargador de arranque syslinux en el dispositivo.

Estos métodos evitan la configuración del cargador de arranque integrado en las imágenes Fedora, que están pre particionadas y diseñadas para arrancar sobre sistemas UEFI con SecureBoot habilitado así como sobre sistemas BIOS y por lo tanto no producen resultados consistentes con imágenes Fedora, especialmente sobre sistemas UEFI.

Los mejores resultados se producen con utilidades que usan un método de lectura directa y no modifican la imagen Fedora.

Piense siempre dos veces antes de escribir una imagen en el dispositivo. Los métodos de creación de medios descritos en este artículo son destructivos. Todos los datos en el lápiz USB son borrados durante el proceso, de modo que esté seguro de tener copia de seguridad de los datos del lápiz USB. ¡Haga una doble comprobación de que ha seleccionado el dispositivo correcto para escribir la imagen!

Instalar y ejecutar Escritor de Medios Fedora

Sobre Fedora

Sobre Fedora 25 o posteriores, Escritor de Medios Fedora está disponible en el repositorio predeterminado. Puede usar dnf para instalar el paquete.

  1. To install the Fedora Media Writer using:

    $ sudo dnf install mediawriter
  2. Run the Fedora Media Writer:

    $ mediawriter

    or in Gnome 3 select Activities, then select Utilities, and then click on Fedora Media Writer.

On other Linux distributions

The best way to install Fedora Media Writer on various Linux distributions is to use the pre-built Flatpak package. The package can be obtained from the official Flatpak repository Flathub.org.

  1. To setup Flatpak on your Linux system, follow the guidelines on the Flatpak documentation page.

  2. Run the application:

    $ sudo mediawriter

On Windows

  1. Download the latest Windows Installer file from GetFedora.org. The server automatically detects the running system and offers you the correct installation file for your Windows version.

  2. Run the installation by double clicking the installer, and then continue through the set-up wizard. The Wizard lets you customize the software’s installation if you choose to.

  3. Run the application by clicking on a launcher.

    In Windows 8 and 10, the Fedora Media Writer launcher will be placed in the All apps menu under F. In Windows 10, you can just type Fedora Media Writer in the search box on the task bar.

On MacOS

  1. Download the latest Macintosh Disk Image (the package will have a .dmg extension) from GetFedora.org. The server automatically detects the running system and offers a correct package for your MacOS.

  2. Open the .dmg file and copy the mediawriter file into your applications folder.

  3. Navigate to your applications directory, and then launch the Fedora Media Writer application.

  4. Select "Open" to run the program, when MacOS will ask you to confirm the action.

Writing the ISO image to the USB Media.

  1. Select the Fedora Edition you wish to make a bootable USB drive for.

    Image of Fedora Media Writer Main Screen
    Figure 1. Fedora Media Writer Main Screen: Choose your Edition of Fedora

    The main selection lets you choose one of the default Fedora editions, Fedora Workstation or Server. Fedora Media Writer displays more details about the edition before you can proceed with downloading the image and the USB creation. You can choose a different architecture, if you select Other variants.

  2. Select "Create Live USB" to proceed.

    Image of Fedora Media Writer Distro Information Screen
    Figure 2. Fedora Media Writer Distro Information

    Fedora Media Writer will automatically download the ISO for you. If you have downloaded the ISO before and placed it in the Downloads directory, it will be immediately available to use.

    Image of Fedora Media Writer Automatic Download
    Figure 3. Fedora Media Writer Automatic Download
  3. Plug in a USB drive on which you want to create the bootable media.

  4. To write the image onto the media, click the red Write to disk button.

    Image of Fedora Media Writer write to device red button
    Figure 4. Fedora Media Writer Write to USB Device

Other methods to create a live USB

Using the Fedora Media Writer is highly recommended for everybody, because it offers a reliable way to create a live USB stick for Fedora installation.

However, some experienced users may prefer to go through the creation process manually. If you decide to do so, you have to download the installation images and use an application to write them onto the USB stick.

If you have downloaded and verified the installation images manually, you still can write them onto the USB stick using Fedora Media Writer.

Downloading Boot and Installation Images

The Fedora Project offers different Editions tailored for some specific use cases. Choose the Fedora Edition best for you, or you can build your own by customizing after the installation, or by using a kickstart file as described in Creating a Kickstart File. Kickstart installation requires the netinstall media type, or a direct installation booting method such as PXE; kickstarts are not supported with live images.

Read more about Fedora Workstation, Fedora Cloud, Fedora Server and the available media types in Downloading Fedora.

You can also choose a Fedora Spin featuring favorite alternative desktops or tools for specialized tasks at https://spins.fedoraproject.org.

Verifying the Downloaded Image

Because transmission errors or other problems may corrupt the Fedora image you have downloaded, it is important to verify the file’s integrity. After the images are created, an operation is performed on the file that produces a value called a checksum using a complex mathematical algorithm. The operation is sufficiently complex that any change to the original file will produce a different checksum.

By calculating the image’s checksum on your own computer and comparing it to the original checksum, you can verify the image has not been tampered with or corrupted. The original checksum values are provided at https://getfedora.org/security/, and are gpg signed to demonstrate their integrity.

Verifying checksums on Windows systems

  1. Download the Fedora image of your choice from https://fedoraproject.org/get-fedora and the corresponding checksum file from https://getfedora.org/security/

  2. Open a powershell session.

  3. Change to the directory containing the downloaded files.

    > cd $HOME\Downloads\
    > ls
    
    Directory: C:\Users\Pete\Downloads
    
    Mode                LastWriteTime         Length  Name
    ----                -------------         ------  ----
    -a---        11/25/2014  12:39 PM            272  Fedora-Server-21-x86_64-CHECKSUM
    -a---        11/25/2014  12:39 PM     2047868928  Fedora-Server-DVD-x86_64-21.iso
  4. Load the resources required to calculate the checksum.

    > $image = "Fedora-Server-DVD-x86_64-21.iso"
    > $checksum_file = "Fedora-Server-21-x86_64-CHECKSUM"
    > $sha256 = New-Object -TypeName System.Security.Cryptography.sha256CryptoServiceProvider
    > $expected_checksum = ((Get-Content $checksum_file | Select-String -Pattern $image) -split " ")[0].ToLower()
  5. Calculate the downloaded image’s checksum. This will take a while!

    > $download_checksum = [System.BitConverter]::ToString($sha256.ComputeHash([System.IO.File]::ReadAllBytes("$PWD\$image"))).ToLower() -replace '-', ''
  6. Compare the calculated checksum to the expected checksum.

    > echo "Download Checksum: $download_checksum"
    > echo "Expected Checksum: $expected_checksum"
    > if ( $download_checksum -eq "$expected_checksum" ) {
    echo "Checksum test passed!"
    } else {
    echo "Checksum test failed."
    }

Verifying checksums on Linux and OSX systems

  1. Download the Fedora image of your choice from https://fedoraproject.org/get-fedora and the corresponding checksum file from https://getfedora.org/security/

  2. Open a terminal window, and navigate to the directory with the downloaded files.

    $ cd ~/Downloads
  3. Use the appropriate utility to verify the image checksum.

    • For Linux:

      $ sha256sum -c *CHECKSUM
    • For OSX:

      $ grep '^SHA256' *-CHECKSUM | awk -F '[()=]' '{ print $4 " " $2 }' | shasum -a 256 -c

Writing the images to USB media

Creating USB media with GNOME Disks

  1. On a system with GNOME, or with the gnome-disk-utility package installed, open Disks using the system menu.

  2. Click your USB device in the left column.

  3. Click the menu icon in the upper right corner of the window, and choose the Restore Disk Image option.

  4. Navigate to your image file and click Start Restoring. After a few minutes, it will report the process is complete and your installation media will be ready to use.

Creating USB Media on the Linux command line

  1. Open a terminal window and insert the usb drive.

  2. Find the device node assigned to the drive. In the example below, the drive is given sdd.

    $ dmesg|tail
    [288954.686557] usb 2-1.8: New USB device strings: Mfr=0, Product=1, SerialNumber=2
    [288954.686559] usb 2-1.8: Product: USB Storage
    [288954.686562] usb 2-1.8: SerialNumber: 000000009225
    [288954.712590] usb-storage 2-1.8:1.0: USB Mass Storage device detected
    [288954.712687] scsi host6: usb-storage 2-1.8:1.0
    [288954.712809] usbcore: registered new interface driver usb-storage
    [288954.716682] usbcore: registered new interface driver uas
    [288955.717140] scsi 6:0:0:0: Direct-Access     Generic  STORAGE DEVICE   9228 PQ: 0 ANSI: 0
    [288955.717745] sd 6:0:0:0: Attached scsi generic sg4 type 0
    [288961.876382] sd 6:0:0:0: sdd Attached SCSI removable disk
  3. Use the dd utility to write the image.

    # dd if=/path/to/Fedora-Live-Security-x86_64-21.iso of=/dev/sdd

    Pay extreme attention to the source (if=) and target (of=) device. The dd command destroys all data on the target device. If you made a mistake, you could lose important data.

Creating a Boot CD or DVD

In addition to creating a bootable USB flash drive, you can also use the provided ISO images to create bootable optical media (a CD or DVD). This approach may be necessary when installing Fedora on an older system which can not boot from USB.

The exact steps you need to take to burn a bootable CD or DVD from an ISO image will vary depending on what disc burning software you use. This procedure only offers a general overview.

  1. Insert a blank CD or DVD into your system’s CD or DVD burner.

  2. Open your system’s burning software - for example, Brasero on Fedora systems with GNOME desktop environment, or Nero on Windows systems. In the software’s main menu, find an option which lets you burn an ISO image to a disc. For example, in Brasero, this option is Burn image in the main menu on the left side of the window.

  3. When prompted, select the ISO image of Fedora to be burned, and the CD or DVD burner with a blank disc inside (if you have more than one drive).

  4. Confirm your selection, and wait for the disc to be burned.