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Docker Swarm : Raspberry Pi powered

Architecture

  • 1 RPi 4 4GB (Yggdrasil)
  • 2 RPi 3B+ 1GB (Thor & Loki)
  • 1 RPi 3B 1GB (Odin)

Performance tests and consequences

SD Card speed

SD Card used : Samsung Evo Plus 32G

RPi 4 RPi 3B+ RPi 3B
Seq Write Speed (1000 MiB) 18 MiB/s 16 MiB/s 1 MiB/s
Seq Read Speed (1000 MiB) 40 MiB/s 20 MiB/s 19 MiB/s

RPi 3B is insanely slow on seq. write speed. Might be an hardware issue !

Disk speed (USB)

Disk used : Seagate 1 To Expansion USB 3.0

Disk format : NTFS RPi 4 RPi 3B
Seq Write Speed (1000 MiB) 18 MiB/s 18 MiB/s
Seq Read Speed (1000 MiB) 63 MiB/s 29 MiB/s
Disk format : Ext4 RPi 4 RPi 3B
Seq Write Speed (1000 MiB) 85 MiB/s Not tested
Seq Read Speed (1000 MiB) 106 MiB/s No tested

I need high speed between HDD <-> Pi <-> Ethernet, so try to reduce bottleneck.

Disk speed (NFS)

Drive is on RPi4, NFS mounted on other Pi.

RPi 4 RPi 3B+ RPi 3B
Seq Write Speed (1000 MiB) -- 30 MiB/s 11 MiB/s
Seq Read Speed (1000 MiB) -- 40 MiB/s 11 MiB/s

RPi3 Ethernet port is 100 Mbps which is ~11MiB/s so this is accurate.

Ethernet speed

RPi 4 RPi 3B+ RPi 3B
Download 35-88 MiB/s 18-30 MiB/s 11 MiB/s
Upload ? 0.5 MiB/s ? 16.7-24.5 MiB/s 10.4 MiB/s

Pre-requisites

DietPi

Install DietPi OS on every Pi following this tutorial.

Configure SSH Keys

On each RPi :

  1. Generate RSA keys ssh-keygen
  2. Copy the output to ~/.ssh/authorized_keys on every other Pi
  3. Install Docker with dietpi-software : sudo dietpi-software