MongoDB on macOS: How do I resolve chown: data/db: No such file or directory - mongodb

Question

I installed MongoDB via Homebrew and created the /data/db directory.
When I run sudo chown -R id -un /data/db. I get this error:
chown: data/db: No such file or directory
I've tried all solutions I can find online and I see that the directory exists, but I am not sure what's going on. When I run mongod this is what I get:
Solomons-MacBook-Pro:expense-tracker Solomon$ mongod
{"t":{"$date":"2021-11-07T19:02:47.741-08:00"},"s":"I",
"c":"NETWORK", "id":4915701, "ctx":"-","msg":"Initialized wire
specification","attr":{"spec":{"incomingExternalClient":{"minWireVersion":0,"maxWireVersion":13},"incomingInternalClient":{"minWireVersion":0,"maxWireVersion":13},"outgoing":{"minWireVersion":0,"maxWireVersion":13},"isInternalClient":true}}}
{"t":{"$date":"2021-11-07T19:02:47.747-08:00"},"s":"I",
"c":"CONTROL", "id":23285, "ctx":"main","msg":"Automatically
disabling TLS 1.0, to force-enable TLS 1.0 specify
--sslDisabledProtocols 'none'"} {"t":{"$date":"2021-11-07T19:02:47.748-08:00"},"s":"W", "c":"ASIO",
"id":22601, "ctx":"main","msg":"No TransportLayer configured during
NetworkInterface startup"}
{"t":{"$date":"2021-11-07T19:02:47.748-08:00"},"s":"I",
"c":"NETWORK", "id":4648602, "ctx":"main","msg":"Implicit TCP
FastOpen in use."}
{"t":{"$date":"2021-11-07T19:02:47.754-08:00"},"s":"W", "c":"ASIO",
"id":22601, "ctx":"main","msg":"No TransportLayer configured during
NetworkInterface startup"}
{"t":{"$date":"2021-11-07T19:02:47.756-08:00"},"s":"I", "c":"REPL",
"id":5123008, "ctx":"main","msg":"Successfully registered
PrimaryOnlyService","attr":{"service":"TenantMigrationDonorService","ns":"config.tenantMigrationDonors"}}
{"t":{"$date":"2021-11-07T19:02:47.756-08:00"},"s":"I", "c":"REPL",
"id":5123008, "ctx":"main","msg":"Successfully registered
PrimaryOnlyService","attr":{"service":"TenantMigrationRecipientService","ns":"config.tenantMigrationRecipients"}}
{"t":{"$date":"2021-11-07T19:02:47.756-08:00"},"s":"I",
"c":"CONTROL", "id":4615611, "ctx":"initandlisten","msg":"MongoDB
starting","attr":{"pid":3449,"port":27017,"dbPath":"/data/db","architecture":"64-bit","host":"Solomons-MacBook-Pro.local"}}
{"t":{"$date":"2021-11-07T19:02:47.756-08:00"},"s":"I",
"c":"CONTROL", "id":23403, "ctx":"initandlisten","msg":"Build
Info","attr":{"buildInfo":{"version":"5.0.3","gitVersion":"657fea5a61a74d7a79df7aff8e4bcf0bc742b748","modules":[],"allocator":"system","environment":{"distarch":"x86_64","target_arch":"x86_64"}}}}
{"t":{"$date":"2021-11-07T19:02:47.756-08:00"},"s":"I",
"c":"CONTROL", "id":51765, "ctx":"initandlisten","msg":"Operating
System","attr":{"os":{"name":"Mac OS X","version":"21.1.0"}}}
{"t":{"$date":"2021-11-07T19:02:47.756-08:00"},"s":"I",
"c":"CONTROL", "id":21951, "ctx":"initandlisten","msg":"Options set
by command line","attr":{"options":{}}}
{"t":{"$date":"2021-11-07T19:02:47.758-08:00"},"s":"E",
"c":"NETWORK", "id":23024, "ctx":"initandlisten","msg":"Failed to
unlink socket
file","attr":{"path":"/tmp/mongodb-27017.sock","error":"Permission
denied"}} {"t":{"$date":"2021-11-07T19:02:47.758-08:00"},"s":"F",
"c":"-", "id":23091, "ctx":"initandlisten","msg":"Fatal
assertion","attr":{"msgid":40486,"file":"src/mongo/transport/transport_layer_asio.cpp","line":960}}
{"t":{"$date":"2021-11-07T19:02:47.758-08:00"},"s":"F", "c":"-",
"id":23092, "ctx":"initandlisten","msg":"\n\n***aborting after
fassert() failure\n\n"}

Answer 1

I encountered this issue today. Try the following commands in order :
sudo mkdir -p /System/Volumes/Data/data/db --> This will create a new folder, as with the new Catalina OS, the root directory changed.
After this command, you will need to get write permissions.
sudo chown -R id -un /System/Volumes/Data/data/db
In order to finally open a mongo db connection, enter the following command:
sudo mongod --dbpath /System/Volumes/Data/data/db
For reference, use the following link: https://superuser.com/questions/1458974/macos-switched-root-mongodb-data-folder-to-system-ownership-and-it-cannot-be-cha

Answer 2

On your Mac, if you used Homebrew to install MongoDB, the data directory is created on installation. However, it is not data/db. Instead, on Intel Mac it is /usr/local/var/mongodb and on M1 Mac it is /opt/homebrew/var/mongodb.
To correctly install MongoDB using Homebrew (of course, check what's the latest version):
brew tap mongodb/brew
brew install mongodb-community#6.0
First, check that your MongoDB is running ok by listing the running services using brew:
brew services list
You should see something like:
Name Status User File
MongoDB-community started root
If not, try to stop, start or restart the service:
brew services stop mongodb/brew/mongodb-community
brew services start mongodb/brew/mongodb-community
brew services restart mongodb/brew/mongodb-community
For further information about the possible problems, check the log file:
tail $(brew --prefix)/var/log/mongodb/mongo.log
More details in the official documentation.

Answer 3

After Catalina the root folder is no longer writable.
So I created a folder on Desktop called MongoDB, and inside here the tmp & data/db.
And now I run it like this:
mongod --unixSocketPrefix ~/Desktop/MongoDB/tmp --dbpath ~/Desktop/MongoDB/data/db