core reboot re-added grub and rescue iso

1 files changed, 74 insertions, 0 deletions

diff --git a/core/reboot.html b/core/reboot.html
index fd1adfc..c60265a 100644
--- a/core/reboot.html
+++ b/core/reboot.html
@@ -54,6 +54,80 @@
         # pkgadd /usr/ports/packages/linux-libre#4.9.11-2.pkg.tar.gz
         </pre>
 
+        <h2 id="grub">1.4.3. Configuring Grub2</h2>
+
+        <p>Create grub file in /etc/default/grub with values;</p>
+
+        <pre>
+        GRUB_DISABLE_LINUX_UUID=false
+        GRUB_ENABLE_LINUX_LABEL=false
+        </pre>
+
+        <p><a href="http://www.gnu.org/software/grub/manual/grub.html">Grub Manual</a>,
+        install grub on MBR of disk sdb;</p>
+
+        <pre>
+        # grub-install /dev/sdb
+        Installation finished. No error reported.
+        </pre>
+
+        <p>If you are installing on removable media;</p>
+
+        <pre>
+        # grub-install --removable /dev/sdb
+        Installation finished. No error reported.
+        </pre>
+
+        <p>grub-mkconfig generates grub.cfg, it will try to discover
+        available kernels and attempt to generate menu entries for
+        them;</p>
+
+        <pre>
+        # grub-mkconfig -o /boot/grub/grub.cfg
+        Generating grub.cfg ...
+        Found linux image: /boot/vmlinuz-4.1.30-crux
+        Found initrd image: /boot/initramfs-4.1.30-crux.img
+        done
+        #
+        </pre>
+
+        <p>Check /boot/grub/grub.cfg, if is wrong add menu to
+        /etc/grub.d/40_custom, replace correct partition from grub-prob
+        output and correct UUID from fstab or blkid</p>
+
+        <pre>
+        # grub-probe --target=hints_string /
+        </pre>
+
+        <h3>Rescue iso</h3>
+
+        <p>Simple way to have "resque" system is to mount boot as read only,
+        this assures that even as root nothing can be changed without remount.
+        To have different system independent from host grub will have entry to
+        boot small iso on /boot partition;</p>
+
+        <p>Crux iso is not used because at the moment it fails to
+        find "crux-media" during or after init.</p>
+
+        <pre>
+        $ wget http://ftp.nluug.nl/os/Linux/distr/tinycorelinux/7.x/x86/release/CorePlus-current.iso
+        $ sudo mv CorePlus-current.iso /boot/tinycore.iso
+        </pre>
+
+        <p>Edit /etc/grub.d/40_custom</p>
+
+        <pre>
+
+        menuentry "Rescue" {
+            load_video
+            set gfxpayload=keep
+
+            set isofile="/tinycore.iso"
+            loopback loop $isofile
+            linux (loop)/boot/vmlinuz64 loglevel=3 cde
+            initrd (loop)/boot/corepure64.gz
+        }
+
         <h2 id="checkup">1.4.4. Checkup</h2>
 
         <p>If you have qemu installed you can see if it boots, in this