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--- linux:grub2 [2015/01/03 23:22] – vytvořeno nost23
+++ linux:grub2 [2023/01/25 16:01] (aktuální) – pridana sekce Zmena kernel boot options nost23
@@ Řádek 1: / Řádek 1: @@
 ====== Grub 2 ======
-==== Preskoceni systemu z boot menu ====
+===== FACTS =====
+od verze 2.00 se nejak sere...prej /boot neni ext3.. takze instaluju s --force --recheck
+a pote nutno zamknout soubor core.img (aby se neposunul, jinak se to podela jak lilo...bug)
+<code bash>
+# chattr +i /boot/grub2/i386-pc/core.img
+</code>
+zmeny do /etc/default/grub
+===== Zmena kernel boot options =====
+https://fedoraproject.org/wiki/GRUB_2#Updating_the_GRUB_configuration_file
+==== do Fedora 33 ====
+  - upravime ///etc/default/grub//
+  - pregenerujeme vlastni config<code bash>
+# grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg
+</code>
+==== Fedora 33+ ====
+<WRAP info>Boot options jsou ulozene v //grubenv// souboru, takze nestaci manualni zmena v ///boot/grub2.grub.cfg//.
+Dale se zmenila cesta ke konfiguracnimu souboru, puvodni je pouze "include" noveho!</WRAP>
+  - upravime ///etc/default/grub//
+  - pregenerujeme vlastni config<code bash>
+# grub2-mkconfig -o /boot/grub2/grub.cfg
+</code>
+===== VYPNUTI OSTATNICH OS [ OS-PROBER ] =====
+  * edit /etc/default/grub; add lines / modify value:
+<code ini>
+GRUB_DISABLE_OS_PROBER="true"
+</code>
+  * vygenerujeme znovu konfiguraci
+<code bash>
+sudo grub2-mkconfig > /boot/grub2/grub.cfg
+</code>
+===== Preskoceni systemu z boot menu =====
+  * do /etc/default/grub pridat
 <code ini>
 GRUB_OS_PROBER_SKIP_LIST="4E26E10726E0F13F@/dev/sda1 07a6db3e-fed0-1e8e-c1b3-548e3bd90d64@/dev/sda6"
+</code>
+  * vygenerujeme znovu konfiguraci
+<code bash>
+sudo grub2-mkconfig > /boot/grub2/grub.cfg
+</code>
+===== PREINSTALACE Z LIVECD =====
+<WRAP alert>
+Plati pro disk **/dev/sda** kde je Linux nainstalovan na oddilu **/dev/sda7**.
+</WRAP>
+<code bash>
+sudo mount /dev/sda7 /mnt
+sudo mount --bind /dev /mnt/dev
+sudo mount --bind /dev/pts /mnt/dev/pts
+sudo mount --bind /proc /mnt/proc
+sudo mount --bind /sys /mnt/sys
+sudo chroot /mnt
+grub-install /dev/sda
+update-grub
+exit
+sudo umount /mnt/{dev/pts,dev,proc,sys}
+sudo reboot # restartuje okamzite, nebo restartuj rucne :)
+</code>
+===== GRAFIKA =====
+[ http://forums.fedoraforum.org/showthread.php?t=276691 ]
+  * vypsani dostupnych grafickych modu:
+v grub command prompt
+<code>
+# set pager=1
+# insmod vbe
+#vbeinfo
+</code>
+  * do /etc/default/grub
+<code ini>
+GRUB_VIDEO_BACKEND="vbe"
+GRUB_TERMINAL_OUTPUT="gfxterm"
+#GRUB_FONT_PATH="/boot/grub2/themes/system/DejaVuSans-Bold-14.pf2"
+#GRUB_FONT_PATH="/boot/grub2/themes/system/DejaVuSans-10.pf2"
+#GRUB_FONT_PATH="/boot/grub2/themes/system/DejaVuSans-12.pf2"
+GRUB_FONT_PATH="/boot/grub2/fonts/DejaVuSansMono-24.pf2"
+#GRUB_BACKGROUND="/boot/grub2/themes/system/background.png"
+GRUB_BACKGROUND="/boot/grub2/fonts/background-sized.png"
+#GRUB_THEME="/boot/grub2/themes/system/theme.txt"
+GRUB_GFXMODE="1280x720x32"
+#GRUB_GFXPAYLOAD_LINUX=keep #text for troubles
+</code>
+===== ISO BOOT =====
+<WRAP alert>
+!!! hlavne musi umet iso, napr debian live iso
+</WRAP>
+  * custom.cfg nebo (cistejsi) /etc/grub.d/40_custom
+==== UBUNTU ====
+<code>
+submenu "BackTrack 5 R2 KDE ISO"{
+menuentry "BackTrack Text - Persistent CUDA Boot Text Mode" --class ubuntu --class gnu-linux --class gnu --class os {
+        savedefault
+        load_video
+        set gfxpayload=1280x800x32
+        insmod gzio
+        insmod part_msdos
+        insmod ntfs
+        insmod ext2
+        echo 'Loading BackTrack 5 R2 iso'
+	# z BACKTRACK DVD hlavne musi byt zkopirovany adresar /casper (!!!v grub2 se partition pocitaji od 1!!! /dev/sda1 = hd0,msdos1)
+        linux (hd0,msdos7)/bt/casper/vmlinuz boot=casper persistent live-media-path=/bt/casper/ text splash intel_iommu=off
+        echo 'Loading initial ramdisk ...'
+        initrd   (hd0,msdos7)/bt/casper/initrdcuda.gz
+}
+}
+</code>
+==== DEBIAN ====
+<code>
+menuentry "${title}" {
+${grub_prep}
+        iso_path="${rel_dirname}/${grml}"
+        export iso_path
+        kernelopts=" $CUSTOM_BOOTOPTIONS $additional_param "
+        export kernelopts
+        loopback loop "${rel_dirname}/$grml"
+        set root=(loop)
+        configfile /boot/grub/loopback.cfg
+}
 </code>