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$ [command]#df -h#
$ [command]#su -#
Additionally, the [application]*kdump* crash kernel dumping mechanism reserves some memory for the secondary kernel used in case of the primary kernel crashing. This reserved memory will also not be displayed as available when using the [command]#free# command. For details about [application]*kdump* and its memory requirements, see the [citetitle]_{PRODUCT} System Administrator's Guide_, available at link:++https://docs.fedoraproject.org/++[].
After you finish the installation and reboot your system for the first time, it is possible that the system stops responding during the graphical boot sequence, requiring a reset. In this case, the boot loader is displayed successfully, but selecting any entry and attempting to boot the system results in a halt. This usually means a problem with the graphical boot sequence; to solve this issue, you must disable graphical boot. To do this, temporarily alter the setting at boot time before changing it permanently.
After you finish this procedure, you can reboot your computer. {PRODUCT} will not use the graphical boot sequence any more. If you wish to enable graphical boot, follow the same procedure, add the `rhgb` option to the `GRUB_CMDLINE_LINUX` line in the `/etc/default/grub` file and refresh the boot loader configuration again using the [command]#grub2-mkconfig# command.
After you updated the file and saved it, refresh the boot loader configuration so that the change will take effect. Run the following command with root privileges:
Booting into a Graphical Environment
Change the default target to `graphical.target`. To do this, execute the following command:
Configuring the Memory Manually
Disabling Graphical Boot Permanently
Disabling Graphical Boot Temporarily
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_rhel-root 20G 6.0G 13G 32% /
devtmpfs 1.8G 0 1.8G 0% /dev
tmpfs 1.8G 2.7M 1.8G 1% /dev/shm
tmpfs 1.8G 1012K 1.8G 1% /run
tmpfs 1.8G 0 1.8G 0% /sys/fs/cgroup
tmpfs 1.8G 2.6M 1.8G 1% /tmp
/dev/sda1 976M 150M 760M 17% /boot
/dev/dm-4 90G 90G 0 100% /home
For additional information about [command]#df# and an explanation of the options available (such as the [option]#-h# option used in this example), see the `df(1)` man page.
For more information about targets in [application]*systemd*, see the [citetitle]_{PRODUCT} System Administrator's Guide_, available at link:++https://docs.fedoraproject.org/++[].
Graphical login is now enabled by default - you will be presented with a graphical login prompt after the next reboot. If you want to reverse this change and keep using the text-based login prompt, execute the following command as `root`:
# grub2-mkconfig --output=/boot/grub2/grub.cfg
GRUB_CMDLINE_LINUX="rd.lvm.lv=rhel/root rd.md=0 rd.dm=0 vconsole.keymap=us $([ -x /usr/sbin/rhcrashkernel-param ] && /usr/sbin/rhcrashkernel-param || :) rd.luks=0 vconsole.font=latarcyrheb-sun16 rd.lvm.lv=vg_rhel/swap rhgb quiet"
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release.*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="rd.lvm.lv=rhel/root vconsole.font=latarcyrheb-sun16 rd.lvm.lv=rhel/swap $([ -x /usr/sbin/rhcrashkernel.param ] && /usr/sbin/rhcrashkernel-param || :) vconsole.keymap=us rhgb quiet mem=1024M"
GRUB_DISABLE_RECOVERY="true"
If the system started successfully, you can log in normally. Then you will need to disable the graphical boot permanently - otherwise you will have to perform the previous procedure every time the system boots. To permanently change boot options, do the following.
If you are having trouble getting [application]*X* (the [application]*X Window System*) to start, it is possible that it has not been installed. Some of the pre-set base environments you can select during the installation, such as `Minimal install` or `Web Server`, do not include a graphical interface - it has to be installed manually.