Mongodb Raspi4 Qemu

Built-in: WeKan cpu-exec does this automatically

Since WeKan 9.96, the manual wrapper below is built in: every Linux WeKan bundle/Snap/Docker image ships a general cpu-exec helper (plus a same-arch qemu-<arch> static binary in the bundles) that runs any binary through qemu-user automatically when the CPU lacks features the binary needs — e.g. MongoDB 5+ on Raspberry Pi 4 and older (ARMv8.0, no ARMv8.2-A):

cpu-exec --features x86_64=avx,aarch64=atomics mongod --config /etc/mongod.conf

See mongodb-avx-qemu.md for details. The manual steps below still work for a system-wide MongoDB outside WeKan.

Meteor podcast about using MongoDB at unsupported CPUs

• https://www.youtube.com/watch?v=bnU9bUVeN04
• Making MongoDB working with Qemu: https://github.com/wekan/wekan/issues/4321#issuecomment-3006557279

Installing MongoDB

MongoDB 8 arm64 works at M1 Air arm64 macOS and Linux.

But because MongoDB 8 core dumps at RasPi4, running it here with Qemu.

1. Install Ubuntu 24.04 arm64 for Raspberry Pi

2. Install MongoDB 8 repo for Ubuntu 24.04 arm64

3. Install deps:

sudo apt -y install qemu-user

4. Rename MongoDB to different filename:

sudo mv /usr/bin/mongod /usr/bin/mongodreal

5. Edit start scipt for Qemu MongoDB

sudo nano /usr/bin/mongod

6. Copy paste start script for Qemu MongoDB

It uses qemu-user to run MongoDB, and passes all command line arguments to MongoDB.

#!/bin/bash
/usr/bin/qemu-arm64 /usr/bin/mongodreal --config /etc/mongod.conf

7. Save and exit nano: Ctrl-o Enter Ctrl-x Enter

8. Make script executeable

sudo chmod a+x /usr/bin/mongod

9. Start and run MongoDB

sudo systemctl enable mongod

sudo systemctl start mongod