Verify that system.log is used for the web server user. Mine is www data. This is also chmod 777. I noticed that when your / magentoroot / var / log files do not exist or are not configured correctly, magento will write the log files / cache files to / tmp.
Also, do not delete log files. Use sudo truncate -s0 logfilename.log
He cleans them.
Carcomp
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