View log files in Ubuntu Linux

View log files in Ubuntu Linux


Q. Can you explain me log files in Ubuntu Linux and how do I view logs?
A. All logs are stored in /var/log directory under Ubuntu (and other Linux distro).
Linux Log files and usage
=> /var/log/messages : General log messages
=> /var/log/boot : System boot log
=> /var/log/debug : Debugging log messages
=> /var/log/auth.log : User login and authentication logs
=> /var/log/daemon.log : Running services such as squid, ntpd and others log message to this file
=> /var/log/dmesg : Linux kernel ring buffer log
=> /var/log/dpkg.log : All binary package log includes package installation and other information
=> /var/log/faillog : User failed login log file
=> /var/log/kern.log : Kernel log file
=> /var/log/lpr.log : Printer log file
=> /var/log/mail.* : All mail server message log files
=> /var/log/mysql.* : MySQL server log file
=> /var/log/user.log : All userlevel logs
=> /var/log/xorg.0.log : X.org log file
=> /var/log/apache2/* : Apache web server log files directory
=> /var/log/lighttpd/* : Lighttpd web server log files directory
=> /var/log/fsck/* : fsck command log
=> /var/log/apport.log : Application crash report / log file
To view log files at shell prompt
Use tail, more, less and grep command.tail -f /var/log/apport.logmore /var/log/xorg.0.logcat /var/log/mysql.errless /var/log/messagesgrep -i fail /var/log/boot

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