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I have followed the instructions to install emoncms on a RPi2 but have found the root dir needs to be rw for things to work.  The error logs suggest an issue with php not being able to write session stuff.  Looking back over the install instructions the session.save_path variable is set to "/tmp", but there is still a ';' at the front of it.  Removing this seems to allow correct operation with the disk mounted ro.

I could attempt to make a pull request in git, but thought best to check here first.

https://github.com/emoncms/emoncms/blob/bufferedwrite/docs/install.md

Find line:

; session.save_path = "/var/lib/php5"

change to:

; session.save_path = "/tmp"