Checking Your Server's Log Files

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In this article, we'll show you how to check your server's log files. Simply follow the steps below.

Save the file /var/log/warn as a duplicate in the /tmp directory. To do this, enter the following command:

cp /var/log/warn /tmp

Then check the file.

To search the messages logged during the last boot for entries, you can use the following commands:

This command searches the boot log file for lines containing the strings Erro or erro.

dmesg | grep [Ee]rro

This command searches the boot log file for lines in which the strings Fault or fault are included.

dmesg | grep [Ff]ault

This command searches the boot log file for lines which contain the strings Defect or defect.

dmesg | grep [Dd]efect

This command searches the boot log file for lines in which the strings Bad or bad are included.

dmesg | grep [Bb]ad

This command searches the boot log file for lines containing the strings Fail or fail.

dmesg | grep [Ff]ail

This command searches the boot log file for lines that contain the strings Incorrect or incorrect.

dmesg | grep [Ii]ncorrect

This command stores all messages which were logged during the last boot process in the directory /tmp.

dmesg > /tmp/dmesg

In Ubuntu and Debian, the file /var/log/messages will records almost all events. This is the system log of Linux. This file records a variety of events, such as system error messages, changes in the network configuration, etc. In this log file, each entry is listed with a timestamp. 

In CentOS, this information is listed in the file /var/log/syslog.

Messages from the kernel can be found in the kern.log file. This file also contains older messages and messages resulting from iptables rules, for example. The kern.log file can be found in the /var/log directory.