Take a streaming backup¶
Percona XtraBackup supports streaming mode. Streaming mode sends a backup to STDOUT in the xbstream format instead of copying the files to the backup directory.
This method enables you to utilize other programs to filter the backup output, enhancing flexibility in backup storage. For instance, compression can be achieved by directing the output to a compression utility. One advantage of streaming backups and employing Unix pipes is that backups can be automatically encrypted.
Version changes¶
Using --encrypt might create larger backups than expected when used with InnoDB Page Compression.
To avoid this issue with compressed backups, use the --compress option with the --xbstream option in Percona XtraBackup 8.0.31-24 and later.
Use streaming¶
To utilize the streaming feature, you need to employ the --stream option, specifying the stream format (xbstream ) and the location for storing temporary files:
$ xtrabackup --stream=xbstream --target-dir=/tmp
xtrabackup uses xbstream to stream all of the data files to STDOUT, in a
special xbstream format. After all data is streamed, xtrabackup stops and also streams the saved transaction log.
When compression is enabled, xtrabackup compresses the output data, except for the metadata, using the specified compression algorithm. Read about the supported compression algorithms in the Create a compressed backup document.
With xbstream, backups can be copied and compressed simultaneously, significantly speeding up the process. However, if backups are both compressed and encrypted, they need to be decrypted before uncompressing.
| Task | Command |
|---|---|
Stream the backup into an archived named backup.xbstream |
$ xtrabackup --backup --stream=xbstream --target-dir=./ > backup.xbstream |
Stream the backup into a compressed archive named backup.xbstream |
$ xtrabackup --backup --stream=xbstream --compress --target-dir=./ > backup.xbstream |
| Encrypt the backup | $ xtrabackup --backup --stream=xbstream ./ > backup.xbstream gzip -`` | openssl des3 -salt -k “password” backup.xbstream.gz.des3 |
| Unpack the backup to the current directory | $ xbstream -x < backup.xbstream |
| Send the backup compressed directly to another host and unpack it | $ xtrabackup --backup --compress --stream=xbstream --target-dir=./ | ssh user@otherhost "xbstream -x" |
Send the backup to another server using netcat |
On the destination host:$ nc -l 9999 | cat - > /data/backups/backup.xbstreamOn the source host: $ xtrabackup --backup --stream=xbstream ./ | nc desthost 9999 |
| Send the backup to another server using a one-liner | $ ssh user@desthost “( nc -l 9999 > /data/backups/backup.xbstream & )” && xtrabackup --backup --stream=xbstream ./ | nc desthost 9999 |
| Throttle the throughput to 10MB/sec using the pipe viewer tool | $ xtrabackup --backup --stream=xbstream ./ | pv -q -L10m ssh user@desthost “cat - > /data/backups/backup.xbstream” |
| Checksum the backup during the streaming | On the destination host:$ nc -l 9999 | tee >(sha1sum > destination_checksum) > /data/backups/backup.xbstreamOn the source host: $ xtrabackup --backup --stream=xbstream ./ | tee >(sha1sum > source_checksum) | nc desthost 9999Compare the checksums on the source host: $ cat source_checksum 65e4f916a49c1f216e0887ce54cf59bf3934dbadCompare the checksums on the destination host: $ cat destination_checksum 65e4f916a49c1f216e0887ce54cf59bf3934dbad |
| Parallel compression with parallel copying backup | $ xtrabackup --backup --compress --compress-threads=8 --stream=xbstream --parallel=4 --target-dir=./ > backup.xbstream |
Important
The streamed backup must be prepared before restoration. Streaming mode does not prepare the backup.
Get expert help¶
If you need assistance, visit the community forum for comprehensive and free database knowledge, or contact our Percona Database Experts for professional support and services.