where is the linux error log

The Linux error log is in the "/var/log/" directory, which is the storage location of the system log file. There are two error logs of the system: 1. messages, which is the core system log file, which contains boot information when the system starts and other status messages when the system is running; 2. btmp, which records error login logs.

#The operating environment of this tutorial: linux5.9.8 system, Dell G3 computer.

Log files are important system information files, which record many important system events, including user login information, system startup information, system security information, email-related information, various service-related information, etc. . Some of this information is very sensitive, so in Linux these log files can only be read by the root user.

The location of the linux error log

The linux error log is in the "/var/log/" directory. The

/var/ directory is the directory used to save system dynamic data, and the /var/log/ directory is where the system log files are saved.

Two error logs in the system:

Log file	Description
/var/log/btmp	Record error logs. This file is a binary file and cannot be viewed directly with Vi. Instead, you must use the lastb command to view it. The command is as follows: [root@localhost log]#lastb root tty1 Tue Jun 4 22:38 - 22:38 (00:00) #Someone used root at 22:38 on June 4 User login error in local terminal 1
/var/log/messages	It is the core system log file, which contains the boot information when the system starts, and the system Additional status messages at runtime. I/O errors, network errors, and other system errors are logged to this file. Other information, such as a person's identity switching to root, logs of user-customized software installations, will also be listed here.

Note:

In addition to the system default logs, system services installed using RPM packages will also By default, logs are recorded in the /var/log/ directory (the service logs installed by the source code package are stored in the directory specified by the source code package). However, these logs are not recorded and managed by the rsyslogd service. Instead, each service uses its own log management document to record its own logs.

Extended knowledge: Linux View system error log (latest)

In Linux, you can use the tail command to view

The tail command is used to view The basic format of the data at the end of the file is as follows:

tail [选项] 文件名

Example: View the last 50 lines of records

tail -50 /var/log/messages

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