How to identify the source of what com.apple.launchd is attempting to run

The system log on my Mac Mini is showing this error in the system log:

Mar  7 17:51:18 My-Mac-mini com.apple.launchd[1] (org.mongodb.mongod[432]): posix_spawn("/opt/local/bin/mongod", ...): No such file or directory
Mar  7 17:51:18 My-Mac-mini com.apple.launchd[1] (org.mongodb.mongod[432]): Exited with code: 1
Mar  7 17:51:18 My-Mac-mini com.apple.launchd[1] (org.mongodb.mongod): Throttling respawn: Will start in 10 seconds

I have install MONGODB using Brew, and it works properly.

I have used LOCATE to attempt to track the source of the launching PLIST (I guess).

How do I track the source of what Apple's "launchd" is attempting to run?

Solution

You can search the LaunchDaemons folders for that job label:

grep -Rl ">org\.mongodb\.mongod<" /System/Library/LaunchDaemons /Library/LaunchDaemons

(Note: the backslashes and angle-brackets in the search string are needed to avoid false matches, and if you don't have them wrapped in double-quotes, you'll get unexpected results.)

If it's installed using the standard conventions, it should be in /Library/LaunchDaemons/org.mongodb.mongod.plist, but this command should find it whatever it's named.

Once you've found it, you can disable it with:

sudo launchctl unload -w /Library/LaunchDaemons/org.mongodb.mongod.plist

(Or whatever the actual file path is.) If you want, you can also remove the file, but the -w option makes the unload permanent so that isn't really necessary.