I'm trying to load a LaunchAgent in ~/Library/LaunchAgents and although, from command line, it "appears" to load. However, if I try to load it again it says it's "already loaded".

But a process for the application isn't running. ps -e | grep mongo shows nothing (well it shows this grep command).

Anyone know how to troubleshoot these kinds of problems?

Only thing I can find is in /var/log/system.log:

Feb  9 13:15:26 imac com.apple.launchd.peruser.502[130] (homebrew.mxcl.mongodb): Ignored this key: UserName

I'm assuming it's ignoring the UserName because it's being launched from my User directory: ~/Library/LaunchAgents/homebrew.mxcl.mongodb.plist. And as per docs this is to be expected.

I can launch the application just fine from Terminal:


Here's the LaunchAgent plist:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">

1 Answer 1


Got it solved. Will leave this question here…in case someone else has similar issue…and in hopes that someone can offer some good ideas for troubleshooting launchd/launchctl in the future.

My problem was I didn't have my mongod.conf file in the right place. As per plist directive launchctl (or is it launchd?) was looking for /usr/local/etc/mongod.conf but couldn't find it, so, it "loaded" mongod but the app never actually started...and there were no errors to that effect…that I could find.

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