Read-only file system when attempting mkdir /data/db on Mac

Question

I am trying to create a new folder in the main directory

Tried all kinds of examples

sudo mkdir /data/db

sudo mkdir -p /data/db<

Answer 1

So, with macOS Catalina Apple created a new Volume for security purposes. If you’re on macOS Catalina, you'll need to create the /data/db folder in System/Volumes/Data.

Follow these commands

1. sudo mkdir -p /System/Volumes/Data/data/db
2. sudo chown -R id -un /System/Volumes/Data/data/db

Start MongoDB

3. brew services run mongodb-community

4. Enjoy