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--- zfs:clone_a_system:detailed_instructions [2021/10/13 12:26] – created peter
+++ zfs:clone_a_system:detailed_instructions [2021/10/13 12:26] (current) – peter
@@ Line 1: / Line 1: @@
 ====== ZFS - Clone a system - Detailed Instructions ======
+===== Boot the target system =====
+Boot the target system that will receive the ZFS Snapshot.
+----
+===== Remove all previous snapshots on the target system =====
+<code bash>
+zpool import -f tank
+zfs destroy -Rv 'tank@%'
+</code>
+----
+===== Create a snapshot on the source system =====
+On the source system, create a new snapshot, and send it to the target.
+<code bash>
+zfs snapshot -r 'tank@p1snap'
+zfs send -v --props --replicate --large-block --compressed tank@p1snap | ssh root@target 'zfs receive -F tank'
+</code>
+----
+===== Mount the received tank on the target system =====
+On the target:
+<code bash>
+zfs set mountpoint=/sysroot tank/root
+zfs set mountpoint=/sysroot/boot tank/root/boot
+zfs set mountpoint=/sysroot/tmp tank/root/tmp
+zfs set mountpoint=/sysroot/var tank/root/var
+zfs mount -a
+mount --rbind /dev/ /sysroot/dev/
+mount --rbind /proc/ /sysroot/proc/
+mount --rbind /sys/ /sysroot/sys/
+mount --rbind /run/ /sysroot/run/
+chroot /sysroot/ /bin/bash
+</code>
+<WRAP info>
+**NOTE:**  This mounts the freshly received tank, and chroots into it.
+</WRAP>
+----
+===== SELinux relabel =====
+Sets the system to do an SELinux relabel:
+<code bash>
+touch /.autorelabel
+</code>
+----
+===== Update /etc/fstab =====
+Edit /etc/fstab, and fix any UUIDs:
+<file bash /etc/fstab>
+UUID="ABCD-E123"     /boot/efi  vfat  defaults                          0  0
+</file>
+----
+===== Update hostname =====
+Correct the hostname on the target:
+<code bash>
+echo some_hostname > /etc/hostname
+</code>
+----
+===== Limit Memory Usage (Optional) =====
+If the system receiving the clone is low spec, add the zfs configuration limiting memory usage:
+<code bash>
+cp /root/tiny-modprobe.d-zfs.conf /etc/modprobe.d/zfs.conf
+</code>
+----
+===== Rebuild boot =====
+<code bash>
+dracut --force /boot/initramfs-5.2.9-200.fc30.x86_64.img 5.2.9-200.fc30.x86_64
+ZPOOL_VDEV_NAME_PATH=YES grub2-mkconfig > /boot/grub2/grub.cfg
+sed -i '/^set pager/ s/1/0/' /boot/grub2/grub.cfg
+</code>
+<WRAP info>
+**NOTE:  This:
+  * rebuilds the initial ram-filesystem.
+  * rebuilds the grub.cfg.
+  * disables the grub pager.
+</WRAP>
+----
+===== Export the tank =====
+On the target:
+Exit the chroot, unmount filesystems, and export tank:
+<code bash>
+exit
+umount -l /sysroot/{dev,proc,sys,run}/
+zfs set mountpoint=/ tank/root
+zfs set mountpoint=legacy tank/root/boot
+zfs set mountpoint=legacy tank/root/tmp
+zfs set mountpoint=legacy tank/root/var
+zpool export tank
+</code>
+----
+===== Reboot the Target =====
+<code bash>
+reboot -f
+</code>
+----
+===== Remove the snapshot on the target =====
+On the target, remove the snapshot p1snap:
+<code bash>
+zfs destroy -vr 'tank@p1snap'
+</code>
+----
+===== Remove the snapshot on the source =====
+On the sender, remove the snapshot p1snap:
+<code bash>
+zfs destroy -vr 'tank@p1snap'
+</code>