I'm having a problem trying to remount /usr read-only. Some process has a file open for writing on /usr even though nothing I'm running on the computer should need to open files on /usr for writing (except apt-get when I tell it to).
My question is how to I find out what process has a file open for writing on /usr?
I've already google'd and tried lsof, but lsof doesn't show anything unusual and the documentation doesn't help (I'm probably not using it right).
I occasionally get this on my server. I usually just stop non-critical services (apache, postgresql, postfix, sslwrap, etc.) until I am able to remount. Once I remount, I restart the services.
-Roberto Sanchez
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