Understanding log files
By default, all CentOS system log files can be found in /var/log and a full inventory on your current server can be obtained by typing the following command:
# find /var/log
With that said, every system is different, and for overall simplicity, you will find that some of the more common log files (associated with a minimal installation of CentOS 7) will include:
/var/log/messages: This file contains information related to the many native services used by CentOS. This includes (but is not limited to) the kernel logger, the network manager, boot process, mail services,cronjobs, and many other services that do not have their own log files. In many respects, this record can be considered to be a global log file of sorts, and ...
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