docker MySQL realizes automatic backup every day!

ubuntu@ubuntu:~$ sudo docker ps
CONTAINER ID   IMAGE          COMMAND                  CREATED          STATUS         PORTS                                                  NAMES
a30ead8a26fc   mysql:8.0.27   "docker-entrypoint.s…"   10 seconds ago   Up 7 seconds   0.0.0.0:3306->3306/tcp, :::3306->3306/tcp, 33060/tcp   mysql

sudo docker exec -it mysql /bin/bash
#进入mysql容器
mysqldump -uroot -p123456 --all-databases >  emp_`date +%F`.sql
#在容器中备份所有数据库，并以日期命名
exit
#退出容器
sudo docker cp mysql:emp_2022-03-17.sql /var/backup/
#将容器中的备份文件，复制到本地备份文件夹中

ubuntu@ubuntu:~$ sudo docker exec -it mysql /bin/bash
root@a30ead8a26fc:/# mysqldump -uroot -p123456 --all-databases >  emp_`date +%F`.sql
mysqldump: [Warning] Using a password on the command line interface can be insecure.
root@a30ead8a26fc:/# exit
exit
ubuntu@ubuntu:~$ sudo docker cp mysql:emp_2022-03-17.sql /var/backup/
ubuntu@ubuntu:~$ ll /var/backup/
total 11492
drwxrwxrwx  2 root   root      4096 Mar 17 15:45 ./
drwxr-xr-x 14 root   root      4096 Mar 14 17:49 ../
-rw-r--r--  1 root   root   3915599 Mar 17 15:42 emp_2022-03-17.sql

sudo docker exec mysql(容器名) sh -c 'exec mysqldump --all-databases -uroot -p123456 --all-databases' > /var/backup/music_`date +%F`.sql

sudo docker exec -it mysql(容器名) mysqldump -uroot -p123456 --all-databases > /var/backup/music_`date +%F`.sql

ubuntu@ubuntu:~$ sudo mysql -uroot -p < emp_2022-03-15.sql 
Enter password: 
ERROR 1064 (42000) at line 1: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near &#39;mysqldump: [Warning] Using a password on the command line interface can be insec&#39; at line 1

mysql -uroot -p123456 < /var/backup/emp_2022-03-15.sql

mysql -uroot -p
source /var/backup/emp_2022-03-15.sql

#复制备份文件到容器中的var目录
sudo docker cp /var/backup/emp_2022-03-17.sql mysql:/var
#进入容器
sudo docker exec -it mysql bin/bash
#进入mysql
mysql -uroot -p
#使用备份sql恢复数据库
source /var/backup/emp_2022-03-15.sql

#或者不进入mysql直接容器中还原
mysql -uroot -p123456 < /var/backup/emp_2022-03-15.sql

crontab -e

0 2 * * * find /backup/ -mtime +1 -name "*.sql" -delete && sudo docker exec mysql sh -c 'exec mysqldump --all-databases -uroot -p123456 --all-databases' > /var/backup/music_`date +%F`.sql

find /backup/ -mtime +1 -name "*.sql" -delete
#删除2天前的备份任务，即保留3个版本。根据需要自己选择。

#编辑系统日志文件
vim /etc/rsyslog.d/50-default.conf
#去掉前面的#注释符号
cron.*      /var/log/cron.log
#重启日志服务
systemctl restart rsyslog.service

cat /var/log/cron.log 
....
CRON[2015636]: (root) CMD (find /backup/ -mtime +1 -name "*.sql" -delete && sudo docker exec mysql sh -c 'exec mysqldump --all-databases -uroot -p123456 --all-databases' > /var/backup/music_`date +)
....

0 2 * * * find /backup/ -mtime +1 -name "*.sql" -delete && sudo docker exec mysql sh -c 'exec mysqldump --all-databases -uroot -p123456 --all-databases' > /var/backup/music_`date +\%F`.sql