zsync

ZFS replication script by Thorsten Spille thorsten@spille-edv.de

replicates ZFS filesystems/volumes with user parameter bashclub:zsync (or custom name) configured
creates optional snapshot before replication (required zfs-auto-znapshot)
parameter setting uses zfs hierarchy on source
mirrored replication with existing snapshots (filtered by snapshot_filter)
pull/local replication only
auto creates full path on target pool, enforce com.sun:auto-snapshot=false, inherits mountpoint and sets canmount=noauto
raw replication
tested on Proxmox VE 7.x/8.x
ssh cipher auto selection

Installation

Download and make executable

wget -q --no-cache -O /usr/bin/bashclub-zsync https://git.bashclub.org/bashclub/zsync/raw/branch/dev/bashclub-zsync/usr/bin/bashclub-zsync
chmod +x /usr/bin/bashclub-zsync
bashclub-zsync

Configuration

After first execution adjust the default config file /etc/bashclub/zsync.conf:

# target path on local machine
target=backup/px1

# source host
source=user@host

# source host ssh port
sshport=22

# tag to mark source filesystem
tag=bashclub:zsync

# snapshot name filter
snapshot_filter="hourly|daily|weekly|monthly"

# number of minimum snapshots to keep (per snapshot filter)
min_keep=3

# number of zfs snapshots to keep on source (0 = snapshot function disabled)
zfs_auto_snapshot_keep=0

# make snapshot via zfs-auto-snapshot before replication
zfs_auto_snapshot_label="backup"

Define a cronjob

cron.d example

File: /etc/cron.d/bashclub-zsync

00 23 * * * root /usr/bin/bashclub-zsync -c /etc/bashclub/zsync.conf > /var/log/bashclub-zsync/zsync.log

cron.{hourly|daily|weekly|monthly}

File: /etc/cron.hourly/bashclub-zsync

/usr/bin/bashclub-zsync -c /etc/bashclub/zsync.conf > /var/log/bashclub-zsync/zsync.log

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