infrastructure/roles/lvm_self_backup/templates/backup-lvm.service

[Unit]
Description=Start lvm backup using duplicity.

[Service]
Type=oneshot

TimeoutSec=20h

# Creating snapshots
{% for item in lvm_self_backup_vols %}
ExecStartPre=/usr/sbin/lvcreate -L 1G -n {{ item.lv_name }}_snap -s {{ item.vg_name }}/{{ item.lv_name }}
{% endfor %}

# Mounting snapshots
{% for item in lvm_self_backup_vols %}
ExecStartPre=/usr/bin/mount -o ro,nosuid,noexec{% if item.fstype is defined and item.fstype == "xfs" %},nouuid{% endif %} -t {{ item.fstype | default("ext4") }} /dev/{{ item.vg_name }}/{{ item.lv_name }}_snap /lvm_self_backup_snapshots/{{ item.vg_name }}-{{ item.lv_name }}
{% endfor %}

ExecStart=/usr/local/bin/backup-lvm

# Make sure duplicity container is gone
ExecStopPost=/usr/bin/docker rm --force duplicity-backup-lvm

# Unmount snapshots
{% for item in lvm_self_backup_vols %}
ExecStopPost=/usr/bin/umount /dev/{{ item.vg_name }}/{{ item.lv_name }}_snap || true
{% endfor %}

# Remove snapshots
{% for item in lvm_self_backup_vols %}
ExecStopPost=/usr/sbin/lvremove -f {{ item.vg_name }}/{{ item.lv_name }}_snap
{% endfor %}