Assuming you are cloning from \/dev\/sda to a smaller size disk, \/dev\/sdb:
First clone \/dev\/sda to \/dev\/sdb using weresync.
Then make \/dev\/sdb bootable using the following commands:
mount \/dev\/sdb1 \/mnt\/sysimage
mount –bind \/sys \/mnt\/sysimage\/sys
mount –bind \/dev \/mnt\/sysimage\/dev
mount –bind \/proc \/mnt\/sysimage\/proc
mount –bind \/run \/mnt\/sysimage\/run
systemctl start multipathd.service
chroot \/mnt\/sysimage
cp -p \/boot\/initramfs-$(uname -r).img \/boot\/initramfs-$(uname -r).img.bak
dracut -f
grub2-mkconfig -o \/boot\/grub2\/grub.cfg
grub2-install \/dev\/sdb
sync
umount \/mnt\/sysimage\/run
umount \/mnt\/sysimage\/proc
umount \/mnt\/sysimage\/dev
umount \/mnt\/sysimage\/sys
umount \/mnt\/sysimage
sync
exit
Note that xfs can cause problems if you have to change the UUID of \/dev\/sdb, in which case you will need to backup \/dev\/sdb, then convert the filesystem to ext4 instead. When running weresync, you will need to specify the additional -S option to rsync for sparse files if you have Docker installer to avoid running out of disk space when cloning.<\/p>\n","protected":false},"excerpt":{"rendered":"
Assuming you are cloning from \/dev\/sda to a smaller size disk, \/dev\/sdb: First clone \/dev\/sda to \/dev\/sdb using weresync. Then make \/dev\/sdb bootable using the following commands: mount \/dev\/sdb1 \/mnt\/sysimagemount –bind \/sys \/mnt\/sysimage\/sysmount –bind \/dev \/mnt\/sysimage\/devmount –bind \/proc \/mnt\/sysimage\/procmount –bind \/run \/mnt\/sysimage\/runsystemctl start multipathd.servicechroot \/mnt\/sysimagecp -p \/boot\/initramfs-$(uname -r).img \/boot\/initramfs-$(uname -r).img.bakdracut -fgrub2-mkconfig -o \/boot\/grub2\/grub.cfggrub2-install \/dev\/sdbsyncumount \/mnt\/sysimage\/runumount… Continue reading Cloning a CentOS 7 Disk to Reduce it’s size<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[28,24,20,21,26,25,23,22,27],"_links":{"self":[{"href":"https:\/\/surfnz.com\/blog\/wp-json\/wp\/v2\/posts\/36"}],"collection":[{"href":"https:\/\/surfnz.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/surfnz.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/surfnz.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/surfnz.com\/blog\/wp-json\/wp\/v2\/comments?post=36"}],"version-history":[{"count":4,"href":"https:\/\/surfnz.com\/blog\/wp-json\/wp\/v2\/posts\/36\/revisions"}],"predecessor-version":[{"id":41,"href":"https:\/\/surfnz.com\/blog\/wp-json\/wp\/v2\/posts\/36\/revisions\/41"}],"wp:attachment":[{"href":"https:\/\/surfnz.com\/blog\/wp-json\/wp\/v2\/media?parent=36"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/surfnz.com\/blog\/wp-json\/wp\/v2\/categories?post=36"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/surfnz.com\/blog\/wp-json\/wp\/v2\/tags?post=36"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}