Linux server automatically cuts and cleans logs Linux system Linux how to read Linux tutorials

Demand

Because Nginx log will continue to grow, so we need to cut the log, convenient management, the need to achieve the following effects:

1. The log is automatically cut by date, and the minimum unit is days.
2. When the total amount of logs exceeds a certain amount, the log will be cleaned automatically and the total limit cannot exceed 1000MB.
3. Write to the crontab timer task.

Analysis

1. The Nginx log directory has access.log and Error.log, respectively, according to the date of automatic cutting log to the daily log in the "Yyyymmdd_access/error.log" format to save, with the MV to rename each day's log files.
2. Clean up the log is simple, just to determine the size of the folder, and then a certain date before the log file cleanup is ok.
3. Crontab task is also relatively simple, the details can be seen here.
4. The crux of the problem is that after using the MV to rename the log file yesterday, Nginx will still write to the renamed file (such as Access_20160409.log) to the log, our intention is to make Nginx regenerate a new log file (Access.log) and write.

5. As we all know,linux system everything is a file, so each process has its file descriptor, The Nginx process writes its own file descriptor to the Nginx.pid, and we need to tell Nginx to reopen a new log file (the configuration details of the log file can be seen here, simply by letting the log record what. So we need this directive:

   kill -USR1 `cat ${pid_path}`

   This instruction means: first cat to Nginx PID, is an integer, and then send the signal USR1 to the process, the nginx process received this signal, according to the configuration to reopen a new log file, and write the log.

Realize

Script cut_nginx_log.sh:

#!/bin/bashlog_path=/path/to/nginx/pid_path=/path/to/nginx.pid#清理掉指定日期前的日志DAYS=30#生成昨天的日志文件${log_path}${log_path}-d"yesterday" +"%Y%m%d"${log_path}${log_path}-d"yesterday" +"%Y%m%d"${pid_path}`#文件夹大小-s${log_path}if-gt1000];then    ${logs_path}"access_*" -type f -mtime +$DAYS -exec rm {} \;    ${logs_path}"error_*" -type f -mtime +$DAYS -exec rm {} \;fi

Add to Crontab:
(self-executing at 0 o ' Day)

crontab -e00 * * * /path/to/script

At this point to solve the automatic cutting and clean the log function, there is a question welcome.

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