MySQL 備份Automated MySQL Database BackupVersion 1

http://rimuhosting.com/howto/mysqlbackup.jsp

Want to backup your MySQL databases to another machine on a nightly basis? 

Then create a /etc/cron.daily/mysqlbackup.sh job like this:

mysqldump --compress -u root -p$pw -h $currenthost --add-drop-table --extended-insert --quote-names --databases db1 db2| mysql -u root -p$pw -h $remotehost

Run <code>chmod +x /etc/cron.daily/mysqlbackup.sh</code>.  And change the $ parameters to the appropriate 'real' values.

Or if you are not backing up to a separate host, run:

mysqldump -u root -p$pw -h $currenthost --add-drop-table --extended-insert --quote-names --databases db1 db2 &gt; /var/log/mysql.backup.$(date +"%Y%m%d").sql 

This one is slightly more advanced. It's a bash script that will basically do the same as above but also only keep a certain number of old copies.

Note that this script is prepared to backup as the root user, if you are going to be running this as a non root user you should modify paths to reflect that.

#!/bin/sh

# List of databases to be backed up separated by space

dblist="db_name_1 db_name_2 db_name_3 etc."

# Directory for backups

backupdir=/root/mysql_dumps

# Number of versions to keep

numversions=4

# Full path for MySQL hotcopy command

# Please put credentials into /root/.my.cnf

#hotcopycmd=/usr/bin/mysqlhotcopy

hotcopycmd="/usr/bin/mysqldump --lock-tables --databases"

# Create directory if needed

mkdir -p "$backupdir"

if [ ! -d "$backupdir" ]; then

   echo "Invalid directory: $backupdir"

   exit 1

fi

# Hotcopy begins here

echo "Dumping MySQL Databases..."

RC=0

for database in $dblist; do

   echo

   echo "Dumping $database ..."

   mv "$backupdir/$database.gz" "$backupdir/$database.0.gz" 2&gt; /dev/null

   $hotcopycmd $database | gzip &gt; "$backupdir/$database.gz"

   RC=$?

   if [ $RC -gt 0 ]; then

     continue;

   fi

   # Rollover the backup directories

   rm -fr "$backupdir/$database.$numversions.gz" 2&gt; /dev/null

   i=$numversions

   while [ $i -gt 0 ]; do

     mv "$backupdir/$database.`expr $i - 1`.gz" "$backupdir/$database.$i.gz" 2&gt; /dev/null

     i=`expr $i - 1`

   done

done

if [ $RC -gt 0 ]; then

   echo "MySQL Dump failed!"

   exit $RC

else

   # Hotcopy is complete. List the backup versions!

   ls -l "$backupdir"

   echo "MySQL Dump is complete!"

exit 0

So this system has three parts. First is the file that holds the credentials, e.g. /root/.my.cnf and it's in standard mysql config format like so:

# cat /root/.my.cnf  [client] user=root password=whatever 

Second is the script itself, as listed above. Enter the names of your dbs, how many copies to keep, and where to put them.

Third is the crontab entry that will run this script for you. For example, once per day:

# (Use to post in the top of your crontab)

# ----------------- minute (0 - 59)

# |  -------------- hour (0 - 23)

# |  |  ----------- day of month (1 - 31)

# |  |  |  -------- month (1 - 12)

# |  |  |  |  ----- day of week (0 - 7) (Sunday=0 or 7)

# |  |  |  |  |

# *  *  *  *  *  command to be executed

35 01 * * * /root/mysql_backup.sh

完！