Linux system MySQL automatic backup

1. Configure automatic backup environment

1.1. Create a new folder for storing backup data in the data directory

mkdir -p /data/backup/mysql
#Enter the backup directory to create a mysql_backup.sh script and fill in the data
vi mysql_backup.sh

1.2. Edit the mysql_backup.sh script and add the following data        

#!/bin/bash
#db_user= 'root'
#db_password=`cat /data/www/mysql_password`
#Name database
db_name= 'test'
#Generate the directory where the backup is stored
backup_dir= '/data/backup/mysql/'
#generated date
current_time=$(date + '%Y-%m-%d_%H%M%S')
filepath=$backup_dir$current_time '.sql.gz'
#$db_password $db_user is not used here, it has been written into the configuration file
echo 'Beginning to export the database...'
#/etc/my.cnf This is the specific configuration file of mysql, fill in according to your actual installation path
mysqldump --defaults-extra-file=/etc/my.cnf $db_name | gzip > $filepath
echo 'Exported successfully, the file name is: ' $filepath

1.3. Find the mysql configuration file my.cnf and edit it

[mysqldump]
max_allowed_packet= 400M
host= 127.0 .0 .1
user=root
password= 'root123' # Set as your own password, for example, mine is root123
[mysql]
host= 127.0 .0 .1
#mysqlaccount
user=root
#mysqlpassword
password= 'root123'

1.4 Script to increase permissions

chmod +x ./mysql_backup.sh

or

chmod u+x ./mysql_backup.sh

1.5 TEST test whether the export can be successful

sh ./mysql_backup.sh
# check the results
ll ./mysql

2.1. Enter the following command in the terminal

crontab -e
#Paste the content below, you can change it according to your needs
0 1 , 12 * * * /data/backup/mysql_backup.sh # Backup data every day at 1 am and 12 noon
#You can use the following as a test first, run it once a minute, we only need to check the folder ll /data/backup/mysql
*/ 1 * * * * /data/backup/mysql_backup.sh

2.2, crontab stop and start commands

        Start: /sbin/service crond start

        Stop: /sbin/service crond stop

        Reload: systemctl reload crond.service

        Restart the service: systemctl restart crond.service

        View status: systemctl status crond.service