GCP Consistent snapshots for linux

instance_configs.cfg

# As per https://cloud.google.com/compute/docs/disks/creating-linux-application-consistent-pd-snapshots
# Append to existing file
# /etc/default/instance_configs.cfg
[Snapshots]
enabled = true
timeout_in_seconds = 60

post.sh

#!/bin/bash
# As per https://cloud.google.com/compute/docs/disks/creating-linux-application-consistent-pd-snapshots
# Tested on RHEL 8.7 with stock packages
# /etc/google/snapshots/post.sh
for disk in ${1//,/ }; do
    for disk in $(lsscsi | grep $(echo "$disk" | sed 's|/|:|g') | awk '{print $6}'); do
        mountpoints=$(mount | grep $disk | awk '{print $3}')
        for mountpoint in $mountpoints; do
            echo "mount point is $mountpoint"
            type=$(findmnt $mountpoint | tail -n -1 | awk '{print $3}')
            echo "type is $type"
            # fsfreeze only supports certain filesystems & you should not fsfreeze
            # your root partition as it can freeze your instance
            if echo $type | grep -q "ext3\|ext4\|reiserfs\|xfs" && [ $mountpoint != "/" ]; then
                fsfreeze -u $mountpoint
            fi
        done
    done
done

pre.sh

#!/bin/bash
# As per https://cloud.google.com/compute/docs/disks/creating-linux-application-consistent-pd-snapshots
# Tested on RHEL 8.7 with stock packages
# /etc/google/snapshots/pre.sh
for disk in ${1//,/ }; do
    for disk in $(lsscsi | grep $(echo "$disk" | sed 's|/|:|g') | awk '{print $6}'); do
        mountpoints=$(mount | grep $disk | awk '{print $3}')
        for mountpoint in $mountpoints; do
            echo "mount point is $mountpoint"
            type=$(findmnt $mountpoint | tail -n -1 | awk '{print $3}')
            echo "type is $type"
            # fsfreeze only supports certain filesystems & you should not fsfreeze
            # your root partition as it can freeze your instance
            if echo $type | grep -q "ext3\|ext4\|reiserfs\|xfs" && [ $mountpoint != "/" ]; then
                fsfreeze -f $mountpoint
            fi
        done
    done
done