MongoDB Installation and the Issue in VM Cloud Server

MongoDB suggests that it requires a system of at least 2 cores, 2 GB RAM; but that might not be a problem. After installing the latest MongoDB (eg. v8.0 this 2025) with steps in official documentation, starting the mongod service and status (sudo service mongod status) may show the following error:

mongod.service: Main process exited, code=dumped, status=4/ILL

The meaning is 'ILL', it's related to illegal binary instruction which the MongoDB binary is compiled for CPU with AVX instruction but not available.

Ref: https://superuser.com/a/1814517/540404

The only way to use MongoDB without AVX instructions is to use MongoDB 4 and earlier versions but now at start of 2025 only v5 and up to v8 are from official MongoDB distribution. MongoDB 5 onward won't work without AVX.

See lowest possible official version at: https://www.mongodb.com/docs/manual

Check if the command below has no output, no output means no AVX and must install MongoDB 4 and before:

cat /proc/cpuinfo | grep avx

If MongoDB latest is installed, it's no use, find packages installed and remove them:

# Ubuntu

sudo apt list --installed | grep mongo

# Then sudo apt remove them

Attempt to find some old Linux repo with MongoDB 4, solution:

1. Remove new MongoDB, install v4:
   https://stackoverflow.com/a/68973100/5581893
2. Disable MongoDB upgrade:
   https://stackoverflow.com/a/70308724/5581893

Outcome: MongoDB 4 is still working with VM of 1 core + 1 GB RAM😃