I has already patched phoenix, but it just wasn't clear to me I had to start phoenix with the 't /tmp/miner.log'
Hello

There is a patch included for phoenix miner, which enables logging to a file.
Or get the patch here
https://raw.github.com/disq/bitcoin-rug-monitor/master/logtotext-1.48.diffIt says 1.48 but works on 1.50 too.
After you patched phoenix with that you can add something like this to the command line which
starts phoenix miner "-t /tmp/miner.log". That is the file you give as status_file in the config.