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The log files are located in the <magento-folder>/var/log/ folder.
Most log files are located in the /var/log/ directory. Some applications such as httpd and samba have a directory within /var/log/ for their log files. You may notice multiple files in the log file directory with numbers after them. These are created when the log files are rotated.
You can read a LOG file with any text editor, like Windows Notepad. You might be able to open one in your web browser, too. Just drag it directly into the browser window, or use the Ctrl+O keyboard shortcut to open a dialog box to browse for the file.
You can find them in /var/log within your root Magento installation
There will usually be two files by default, exception.log and system.log.
If the directories or files don't exist, create them and give them the correct permissions, then enable logging within Magento by going to System > Configuration > Developer > Log Settings > Enabled = Yes
To create your custom log file, try this code
Mage::log('your debug message', null, 'yourlog_filename.log');
Refer this Answer
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