第三次作业 运维高级 使用shell脚本实现分库分表备份

编写脚本，使用mysqldump实现分库分表备份

[root@localhost test]# vim s1.sh
#!/bin/bash
user=root #数据库用户
pw=12345  #数据库密码
backup=/backup #备份目录
[ -d $backup ] || mkdir $backup #判断目录是否存在并创建
mysql -u$user -p$pw -e 'show databases' -N | egrep -v 'information_schema|my|sql|performance_schema|sys' > dname  # 将数据库名放入dname中
while read db #读取数据库
do
  mysqldump -u$user -p$pw $db > $backup/$db.sql #备份数据库
  mysql -u$user -p$pw -e "show tables from $db" -N > tname #将数据库表名放入tname中
  mkdir $backup/$db #创建数据库表目录
  while read tb #读取数据库表
  do
    mysqldump -u$user -p$pw $db $tb > $backup/$db/$tb.sql #分别备份数据库表
  done < tname
  rm -rf dname tname
done < dname

[root@localhost test]# tree /backup/
/backup/
├── db
│   └── tb_employee.sql
├── db1
│   └── tb_dept.sql
├── db1.sql
├── db.sql
├── school
│   ├── score.sql
│   └── student.sql
└── school.sql

3 directories, 7 files

验证

[root@localhost test]# mysql -uroot -p12345 -e 'select * from school.score'
mysql: [Warning] Using a password on the command line interface can be insecure.
+----+--------+-----------+-------+
| id | stu_id | c_name    | grade |
+----+--------+-----------+-------+
|  1 |    901 | 计算机    |    98 |
|  2 |    901 | 英语      |    80 |
|  3 |    902 | 计算机    |    65 |
|  4 |    902 | 中文      |    88 |
|  5 |    903 | 中文      |    95 |
|  6 |    904 | 计算机    |    70 |
|  7 |    904 | 英语      |    92 |
|  8 |    905 | 英语      |    94 |
|  9 |    906 | 计算机    |    90 |
| 10 |    906 | 英语      |    85 |
+----+--------+-----------+-------+
#删除表score
[root@localhost test]# mysql -uroot -p12345 -e 'drop table school.score'
mysql: [Warning] Using a password on the command line interface can be insecure.
[root@localhost test]# mysql -uroot -p12345 -e 'show tables from school'
mysql: [Warning] Using a password on the command line interface can be insecure.
+------------------+
| Tables_in_school |
+------------------+
| student          |
+------------------+
#还原表score
[root@localhost test]# mysql -uroot -p12345 school < /backup/school/score.sql 
mysql: [Warning] Using a password on the command line interface can be insecure.
[root@localhost test]# mysql -uroot -p12345 -e 'select * from school.score'
mysql: [Warning] Using a password on the command line interface can be insecure.
+----+--------+-----------+-------+
| id | stu_id | c_name    | grade |
+----+--------+-----------+-------+
|  1 |    901 | 计算机    |    98 |
|  2 |    901 | 英语      |    80 |
|  3 |    902 | 计算机    |    65 |
|  4 |    902 | 中文      |    88 |
|  5 |    903 | 中文      |    95 |
|  6 |    904 | 计算机    |    70 |
|  7 |    904 | 英语      |    92 |
|  8 |    905 | 英语      |    94 |
|  9 |    906 | 计算机    |    90 |
| 10 |    906 | 英语      |    85 |
+----+--------+-----------+-------+
[root@localhost test]#