centos7改用grub2 & 縮小分割區

note

用centos7光碟片開機，trouble shooting->rescue mode->3(shell，don't find all linux parts，umount麻煩)
lsblk找出外接USB代號(/dev/sde1)、硬碟邏輯分區(/dev/sda2)
lvm vgscan -v(掃一下有哪些volume，得到centos)
lvm vgchange -a y(啟動所有volume)
mount /dev/centos/root /mnt/sysimage(掛載要縮小的目標)
mkdir /mnt/usb
mount /dev/sde1 /mnt/usb(掛載USB)
xfsdump -f /mnt/usb/bk.dump /mnt/sysimage(備份整個volume到bk.dump)
umount /mnt/sysimage(卸掉)
lvreduce -L 17G /dev/centos/root(縮小到17G)
mkfs.xfs -f /dev/centos/root(格式化)
mount /dev/centos/root /mnt/sysimage(掛回來)
xfsrestore -f /mnt/usb/bk.dump /mnt/sysimage(還原回去)
reboot

以下參考資料

https://www.thegeekdiary.com/centos-rhel-7-how-to-reinstall-grub2-from-rescue-mode/

chroot後先df看boot在/dev.sd?再install

# grub2-install /dev/sda

CentOS7縮小lvm分割區

https://unix.stackexchange.com/questions/4561/how-do-i-find-out-what-hard-disks-are-in-the-system

卡在magic number一直解決不了，無法進一步縮減

安裝NTFS以便交換資料

yum install ntfs-3g fuse

掛載usb隨身碟

mkdir /usb

mount /deb/sdf1 /usb

備份XFS

swap分割區新增

https://www.centos.org/docs/5/html/Deployment_Guide-en-US/s1-swap-adding.html

# lvm vgscan -v # lvm vgchange -a y # mkdir /mnt/nn # mount /dev/centos/root /mnt/nn

https://askubuntu.com/questions/252204/how-to-shrink-ubuntu-lvm-logical-and-physical-volumes

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