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This is the simplest use case. It copies all your MySQL data into the specified directory. Here is how to make a backup of all the databases in the datadir specified in your my.cnf. It will put the backup in a time stamped subdirectory of /data/backups/, in this case, /data/backups/2010-03-13_02-42-44,
$ innobackupex /data/backups
There is a lot of output, but you need to make sure you see this at the end of the backup. If you don’t see this output, then your backup failed:
100313 02:43:07 innobackupex: completed OK!
To prepare the backup use the --apply-log option and specify the timestamped subdirectory of the backup. To speed up the apply-log process, we using the --use-memory option is recommended:
$ innobackupex --use-memory=4G --apply-log /data/backups/2010-03-13_02-42-44/
You should check for a confirmation message:
100313 02:51:02 innobackupex: completed OK!
Now the files in /data/backups/2010-03-13_02-42-44 is ready to be used by the server.
To restore the already-prepared backup, first stop the server and then use the --copy-back function of innobackupex:
innobackupex --copy-back /data/backups/2010-03-13_02-42-44/ ## Use chmod to correct the permissions, if necessary!
This will copy the prepared data back to its original location as defined by the datadir in your my.cnf.
After the confirmation message:
100313 02:58:44 innobackupex: completed OK!
you should check the file permissions after copying the data back. You may need to adjust them with something like:
$ chown -R mysql:mysql /var/lib/mysql
Now the datadir contains the restored data. You are ready to start the server.