Shell script backup MySQL database

experiment ： Script the backup database

Ideas ：

1. Use variables to save MySQL User name, password

2. call mysqldump Command backup database

3. Use tar Packaging tools for packaging

4. Use crontab Scheduled time backup

1. Create script file

vim data.sh

2. Write code

#!/bin/bash
user="root"  # Sign in MySQL Username 
my_pass="123456" # User name, password 
my_db1="bdqn"  # The name of the database you need to back up 

bf_dir="/backup" # Where to save the backup files 
bf_cmd="/usr/local/mysql/bin/mysqldump" #mysqldump The following directory of the command 
bf_time="$(date +%Y%m%d-%H%M)"  # Backup time 
NAME_1="$my_db1-$bf_time"  # The name of the backup file plus the time 

cd $bf_dir  # Switch to directory 

#mysqldump Backup format ：mysqldump [ Options ] --databases  Library name  > / Backup path / The name of the backup file 
"$bf_cmd" -u "$my_user" -p"$my_pass" --databases  "$my_db1" >"$NAME_1".sql

# Use tar Pack and go backup   --remove Package and delete the source file      
#&>： Put the correct or wrong information into 
tar zcf "$NAME_1".tar.gz "$NAME_1".sql --remove &> /dev/null

Expand ：

/dev/null： Simply put, it is a bottomless pit , Anything you don't want can be thrown inside

Professionally speaking ： Empty file for input stream

 3. Grant execution permission

chmod +x data.sh

4. Run script
 

./data.sh

Warning error

Tips ：Warning: Using a password on the command line interface can be insecure.
intend ： Warning : Using passwords in the command line interface is not safe .

You don't have to pay attention here. In fact, the operation is normal , Because we use the password of variable input ,MySQL Think it's not safe

Expand ：

         Here, if the script is not created /backup The directory script will report an error that the specified folder cannot be found , So here's a lesson for you. If there is no recognition, it will be automatically created  

principle ：

Here's a shell A grammatical judgment of

！： Not , Take the opposite value

-d： Determine if this file exists , Determine whether it is a directory , It's the catalog that's true

&&： The previous command is true , Execute next command

  Be careful ： If necessary, add it before entering the directory

[ ! -d "$bf_dir"  ]  && mkdir -p "$bf_dir"

  We will update about shell Some detailed commands and statements