Differences

This shows you the differences between two versions of the page.

--- zfs:clone_a_system [2021/01/30 14:21] – created peter
+++ zfs:clone_a_system [2021/10/13 12:26] (current) – peter
@@ Line 1: / Line 1: @@
 ====== ZFS - Clone a system ======
-===== Boot the target system =====
+A ZFS clone is a writable copy of a file system with the initial content of the clone being identical to the original file system.
-Boot the target system that will receive the ZFS Snapshot.
+  * A ZFS clone can only be created from a ZFS snapshot and the snapshot cannot be destroyed until the clones created from it are also destroyed.
 ----
-===== Remove all previous snapshots on the target system =====
+===== Clone a system =====
-<code bash>
+First take a snapshot and then clone:
-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'
+sudo zfs snapshot -r testpool/projects@snap1
-zfs send -v --props --replicate --large-block --compressed tank@p1snap | ssh root@target 'zfs receive -F tank'
+sudo zfs clone testpool/projects@snap1 testpool/projects-clone
 </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 =====
+[[ZFS:Clone a system:Detailed Instructions|Detailed Instructions]]
-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>