Snapraid in Docker

This is container uses the latest alpine to compile snapraid from source (latest release) and combines it with a modified snapraid-runner script for additional functionality. These are the source repos for more info:
https://github.com/amadvance/snapraid
https://github.com/fightforlife/snapraid-runner

latest changes

Removing versioning bound to Snapraid version. New master tag will always include the latest snapraid release on latest alpine. Build starts every 2 days on midnight. Older versions will be DEPRECATED.
v12.1.1: Replace email notifications with Apprise, see https://github.com/caronc/apprise/wiki (set url in snapraid-runner.conf)
v12.1: Introduce CRON_SCHEDULE and Update to Snapraid 12.1
v11.6: initial release

Usage

This container is configured using two files snapraid.conf and snapraid-runner.conf. These files neet to be mounted into the container at /config before the container starts.

Docker Compose example

version: '3.8'

services:
  app:
    image: ghcr.io/fightforlife/docker_snapraid:master
    restart: always
    privileged: true
    volumes:
      - type: bind
        source: /dev/disk
        target: /dev/disk
      - /mnt:/mnt
      - config:/config
    environment:
       - TZ=Europe/Berlin
       - PGID=1000
       - GUID=1000
       - CRON_SCHEDULE=0 3 * * *

volumes:
  config:

Parameters

-v /mnt - The location of your data disks, a good convention is /mnt/disk* for your data drives
-v /config - The location of the Snapraid and SnapRAID-runner configurations
-e PGID for GroupID - see below for explanation
-e PUID for UserID - see below for explanation
-e CRON_SCHEDULE=0 3 * * * here you can set the schedule when the snapraid runner is started. (see https://crontab.guru/)

Detecting move operations

You'll probably notice when snapraid runs it gives a warning like WARNING! UUID is unsupported for disks and it may not detect moved files. Instead it seems them as copied and removed. In order to detect the file moves you can run with the following additional paramters.

--privileged will share all your devices (ie /dev/sdb, /dev/sdb1, etc) with your container. Alternatively, you could probably use something like --device /dev/sdb:/dev/sdb --device /dev/sdb1:/dev/sdb1, but you'd need to do it for each drive you have setup.
--mount type=bind,source=/dev/disk,target=/dev/disk mounts the disk listing into the container, so snapraid can run something like ls /dev/disk/by-uuid to get a list of all the disks by UUID

User / Group Identifiers

The PGID and PUID values set the user / group you'd like your container to 'run as' to the host OS. This can be a user you've created or even root (not recommended).

Setting up the application

SnapRAID has a comprehensive manual available here. Any SnapRAID command can be executed from the host easily using docker exec -it <container-name> <command>, for example docker exec -it snapraid snapraid diff. Tips and tricks on configuration snapraid-runner can be found on our forums.

snapraid-runner.conf example

[snapraid]
; path to the snapraid executable (e.g. /bin/snapraid)
executable = /usr/bin/snapraid
; path to the snapraid config to be used
config = /config/snapraid.conf
; abort operation if there are more deletes than this, set to -1 to disable
deletethreshold = 200
; if you want touch to be ran each time
touch = true

[logging]
; logfile to write to, leave empty to disable
file = snapraid-runner.log
; maximum logfile size in KiB, leave empty for infinite
maxsize = 5000

[notification]
enabled = true
; when to send a notificariton on, comma-separated list of [success, error]
sendon = success,error
; set to false to get full programm output
short = true
; Python Apprise url. see https://github.com/caronc/apprise/wiki
url = discord://ID/Token

[scrub]
; set to true to run scrub after sync
enabled = true
; scrub plan - either a percentage or one of [bad, new, full]
plan = 12
; minimum block age (in days) for scrubbing. Only used with percentage plans
older-than = 10

snapraid.conf example

# Example configuration for snapraid

# Defines the file to use as parity storage
# It must NOT be in a data disk
# Format: "parity FILE [,FILE] ..."
parity /mnt/HDD4/snapraid.parity

# Defines the files to use as additional parity storage.
# If specified, they enable the multiple failures protection
# from two to six level of parity.
# To enable, uncomment one parity file for each level of extra
# protection required. Start from 2-parity, and follow in order.
# It must NOT be in a data disk
# Format: "X-parity FILE [,FILE] ..."
#2-parity /mnt/diskq/snapraid.2-parity
#3-parity /mnt/diskr/snapraid.3-parity
#4-parity /mnt/disks/snapraid.4-parity
#5-parity /mnt/diskt/snapraid.5-parity
#6-parity /mnt/disku/snapraid.6-parity

# Defines the files to use as content list
# You can use multiple specification to store more copies
# You must have least one copy for each parity file plus one. Some more don't hurt
# They can be in the disks used for data, parity or boot,
# but each file must be in a different disk
# Format: "content FILE"
content /config/snapraid.content
content /mnt/HDD1/snapraid.content
content /mnt/HDD2/snapraid.content
content /mnt/HDD3/snapraid.content

# Defines the data disks to use
# The name and mount point association is relevant for parity, do not change it
# WARNING: Adding here your /home, /var or /tmp disks is NOT a good idea!
# SnapRAID is better suited for files that rarely changes!
# Format: "data DISK_NAME DISK_MOUNT_POINT"
data d1 /mnt/HDD1/
data d2 /mnt/HDD2/
data d3 /mnt/HDD3/

# Excludes hidden files and directories (uncomment to enable).
#nohidden

# Defines files and directories to exclude
# Remember that all the paths are relative at the mount points
# Format: "exclude FILE"
# Format: "exclude DIR/"
# Format: "exclude /PATH/FILE"
# Format: "exclude /PATH/DIR/"
exclude *.bak
exclude *.unrecoverable
exclude /tmp/
exclude /lost+found/
exclude .AppleDouble
exclude ._AppleDouble
exclude .DS_Store
exclude .Thumbs.db
exclude .fseventsd
exclude .Spotlight-V100
exclude .TemporaryItems
exclude .Trashes
exclude .AppleDB

# Defines the block size in kibi bytes (1024 bytes) (uncomment to enable).
# WARNING: Changing this value is for experts only!
# Default value is 256 -> 256 kibi bytes -> 262144 bytes
# Format: "blocksize SIZE_IN_KiB"
#blocksize 256

# Defines the hash size in bytes (uncomment to enable).
# WARNING: Changing this value is for experts only!
# Default value is 16 -> 128 bits
# Format: "hashsize SIZE_IN_BYTES"
#hashsize 16

# Automatically save the state when syncing after the specified amount
# of GB processed (uncomment to enable).
# This option is useful to avoid to restart from scratch long 'sync'
# commands interrupted by a machine crash.
# It also improves the recovering if a disk break during a 'sync'.
# Default value is 0, meaning disabled.
# Format: "autosave SIZE_IN_GB"
#autosave 500

# Defines the pooling directory where the virtual view of the disk
# array is created using the "pool" command (uncomment to enable).
# The files are not really copied here, but just linked using
# symbolic links.
# This directory must be outside the array.
# Format: "pool DIR"
#pool /pool

# Defines a custom smartctl command to obtain the SMART attributes
# for each disk. This may be required for RAID controllers and for
# some USB disk that cannot be autodetected.
# In the specified options, the "%s" string is replaced by the device name.
# Refers at the smartmontools documentation about the possible options:
# RAID -> https://www.smartmontools.org/wiki/Supported_RAID-Controllers
# USB -> https://www.smartmontools.org/wiki/Supported_USB-Devices
#smartctl d1 -d sat %s
#smartctl d2 -d usbjmicron %s
#smartctl parity -d areca,1/1 /dev/sg0
#smartctl 2-parity -d areca,2/1 /dev/sg0