mysqldump --help
mysqldump -uroot hellodb | gzip > /data/backup_mysql.sql.gz
mysqldump -uroot -B hellodb > /data/mysql_backup1.sql
mysqldump -uroot -A > /data/mysql_backup_all.sql

mysql -uroot < /data/mysql_backup1.sql

for i in `mysql -e 'show databases;' | egrep -v '^(database|information_schema|performance_schema|sys)$'` ; do mysqldump -B $i > /data/mysql_bak_$i_`data +%F`.sql

xtrabackup --help

主从
2-2-3
2个以上实例
2个二进制日志
3个线程


1、 server id
2、 授权用户名密码
3、 开启二进制日志
4、 二进制日志位置

~]# vim /etc/my.cnf.d/mysql-server.cnf
[mysqld]
server-id=48
~]# systemctl restart mysqld
~]# mysql
> show master logs;
 binlog.000002 |       156 | No
 
 > create user repluser@'11.0.1.%' identified by '123456';
 > grant replication slave on *.* to repluser@'11.0.1.%';
 
 > show master logs;
 | binlog.000002 |       681 | No        |
 
 
 ~]# vim /etc/my.cnf.d/mysql-server.cnf
 [mysqld]
server-id=68
 ~]# systemctl restart mysqld
~]# mysql
 > help change master to
 
> CHANGE MASTER TO
  MASTER_HOST='11.0.1.48',
  MASTER_USER='repluser',
  MASTER_PASSWORD='123456',
  MASTER_PORT=3306,
  MASTER_LOG_FILE='binlog.000002',
  MASTER_LOG_POS=681,
  MASTER_CONNECT_RETRY=10;
  
 > start slave;
 > show slave status\G