6.31 ndbxfrm — Compress, Decompress, Encrypt, and Decrypt Files Created by NDB Cluster

The ndbxfrm utility, introduced in NDB 8.0.22, can be used to decompress, decrypt, and output information about files created by NDB Cluster that are compressed, encrypted, or both. It can also be used to compress or encrypt files.

Table 6.28 Command-line options used with the program ndbxfrm

Format	Description	Added, Deprecated, or Removed
--compress, -c	Compress file	ADDED: NDB 8.0.22
--decrypt-password=string	Use this password to decrypt file	ADDED: NDB 8.0.22
--decrypt-password-from-stdin[=value]	Get decryption password in a secure fashion from STDIN	ADDED: NDB 8.0.24
--defaults-extra-file=path	Read given file after global files are read	(Supported in all NDB releases based on MySQL 8.0)
--defaults-group-suffix=string	Also read groups with concat(group, suffix)	(Supported in all NDB releases based on MySQL 8.0)
--defaults-file=path	Read default options from given file only	(Supported in all NDB releases based on MySQL 8.0)
--encrypt-kdf-iter-count=#, -k	Number of iterations used in key definition	ADDED: NDB 8.0.22
--encrypt-password=string	Use this password to encrypt file	ADDED: NDB 8.0.22
--encrypt-password-from-stdin[=value]	Get encryption password in a secure fashion from STDIN	ADDED: NDB 8.0.24
--help, -?	Print usage information	ADDED: NDB 8.0.22
--info, -i	Print file information	ADDED: NDB 8.0.22
--login-path=path	Read given path from login file	(Supported in all NDB releases based on MySQL 8.0)
--no-defaults	Do not read default options from any option file other than login file	(Supported in all NDB releases based on MySQL 8.0)
--print-defaults	Print program argument list and exit	(Supported in all NDB releases based on MySQL 8.0)
--usage, -?	Prints usage information; synonym for --help	ADDED: NDB 8.0.22
--version, -V	Output version information	ADDED: NDB 8.0.22

Usage

ndbxfrm --info file[ file ...]
ndbxfrm --compress input_file output_file
ndbxfrm --decrypt-password=password input_file output_file
ndbxfrm [--encrypt-ldf-iter-count=#] --encrypt-password=password input_file output_file

input_file and output_file cannot be the same file.

Options

• --compress, -c

  Compresses the input file, using the same compression method as is used for compressing NDB Cluster backups, and writes the output to an output file. To decompress a compressed NDB backup file that is not encrypted, it is necessary only to invoke ndbxfrm using the names of the compressed file and an output file (with no options required).

• --decrypt-password=password

  Decrypts a file encrypted by NDB using the password supplied.

• --decrypt-password-from-stdin[=TRUE|FALSE]

  Decrypts a file encrypted by NDB, using a password supplied from standard input. This is similar to entering a password after invoking mysql --password with no password following the option.

• --defaults-extra-file

  Command-Line Format	--defaults-extra-file=path
  Type	String
  Default Value	[none]

  Read given file after global files are read.

• --defaults-file

  Command-Line Format	--defaults-file=path
  Type	String
  Default Value	[none]

  Read default options from given file only.

• --defaults-group-suffix

  Command-Line Format	--defaults-group-suffix=string
  Type	String
  Default Value	[none]

  Also read groups with concat(group, suffix).

• --encrypt-kdf-iter-count=#, -k #

  When encrypting a file, specifies the number of iterations to use for the encryption key. Requires the --encrypt-password option.

• --encrypt-password=password

  Encrypts the backup file using the password supplied by the option. The password must meet the requirements listed here:

  • Uses any of the printable ASCII characters except !, ', ", $, %, \, and ^

  • Is no more than 256 characters in length

  • Is enclosed by single or double quotation marks

  It is possible but not recommended to use an empty password ('' or "").

• --encrypt-password-from-stdin[=TRUE|FALSE]

  Encrypts a file using a password supplied from standard input. This is similar to entering a password is entered after invoking mysql --password with no password following the option.

• --help, -?

  Prints usage information for the program.

• --info, -i

  Prints the following information about one or more input files:

  • The name of the file

  • Whether the file is compressed (compression=yes or compression=no)

  • Whether the file is encrypted (encryption=yes or encryption=no)

  Example:

  shell> ndbxfrm -i BACKUP-10-0.5.Data BACKUP-10.5.ctl BACKUP-10.5.log
  File=BACKUP-10-0.5.Data, compression=no, encryption=yes
  File=BACKUP-10.5.ctl, compression=no, encryption=yes
  File=BACKUP-10.5.log, compression=no, encryption=yes

• --login-path

  Command-Line Format	--login-path=path
  Type	String
  Default Value	[none]

  Read given path from login file.

• --no-defaults

  Command-Line Format	--no-defaults

  Do not read default options from any option file other than login file.

• --print-defaults

  Command-Line Format	--print-defaults

  Print program argument list and exit.

• --usage, -?

  Synonym for --help.

• --version, -V

  Prints out version information.

ndbxfrm can encrypt backups created by any version of NDB Cluster. The .Data, .ctl, and .log files comprising the backup must be encrypted separately, and these files must be encrypted separately for each data node. Once encrypted, such backups can be decrypted only by ndbxfrm, ndb_restore, or ndb_print_backup from NDB Cluster 8.0.22 or later.

An encrypted file can be re-encrypted with a new password using the --encrypt-password and --decrypt-password options together, like this:

ndbxfrm --decrypt-password=old --encrypt-password=new input_file output_file

In the example just shown, old and new are the old and new passwords, respectively; both of these must be quoted. The input file is decrypted and then encrypted as the output file. The input file itself is not changed; if you do not want it to be accessible using the old password, you must remove the input file manually.