1. Create an shell script

 vim backupdb.sh
  Create the script as follows:
 #!/bin/sh
 db_user="root"
 db_passwd="123456"
 db_name="userdb"
 name="$(date +"%Y%m%d%H%M%S")"
 /usr/bin/mysqldump -u$db_user -p$db_passwd $db_name >>/home/backup/$name.sql
  Description:
 /usr/bin/mysqldump  : mysql Under the database installation directory mysqldump Backup tool path
 dbname  Name of database to be backed up
 /home/backup/$name.sql  Backup file output location can be set according to the situation

2. Add execute permissions to the shell script

chmod +x backupdb.sh

3. Add timed tasks to scripts

crontab -e
 Input on 1 Row naming for editing timing task , Finally, add the following
00 01 * * * /bin/sh /usr/local/mysql/backupdb.sh
 The above timed task means every morning 1 Point will perform automatic backup feet , Go on MySQL Timed backup of database .

Description of the crontab file:

In the crontab file created by users, each line represents a timing task, and each field in each line represents a setting. Its format is divided into 6 fields in each line, the first 5 sections are time setting fields, and the sixth section is the command field to be executed.

The format is as follows: minute hour day month week command

Parameter description:

minute: Represents minutes and can be any integer from 0 to 59. hour: Represents an hour and can be any integer from 0 to 23. day: Represents a date and can be any integer from 1 to 31. month: Represents the month and can be any integer from 1 to 12. week: Represents the day of the week and can be any integer from 0 to 7, where 0 or 7 represents Sunday. command: To execute the command, can be Linux system commands, can also be written by their own script files.

Summarize