February 2020
Intermediate to advanced
734 pages
38h 13m
English
Content preview from PostgreSQL 12 High Availability Cookbook - Third Edition
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How to do it...
This procedure will assume pg1 is our current primary node and VG_POSTGRES/LV_DATA is the principal data volume. Follow these steps as the root user to create and use an LVM snapshot:
- Create the snapshot with lvcreate:
lvcreate -l 100%FREE -s -n snap VG_POSTGRES/LV_DATA
- Create a directory to mount the snapshot on using this command:
mkdir /mnt/db_snap
- Mount the snapshot as a regular XFS filesystem using this command:
mount -t xfs -o nouuid /dev/VG_POSTGRES/snap /mnt/db_snap
- Enter the snapshot pgdata directory using this command:
cd /mnt/db_snap/pgdata
- Examine snapshot information with lvdisplay:
lvdisplay VG_POSTGRES/snap | grep snap
Follow these steps as the root user to unmount and remove an LVM snapshot:
- Unmount ...
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