Author: Neil Munday

Contributors: David Murray (https://github.com/dajamu)

Repository: https://github.com/neilmunday/pymsync

pymsync provides the msync utility which allows the user to synchronise a file path via rsync across multiple hosts. Rather than all destination hosts copying from the source host, msync uses an efficient algorithm that makes use of the destination hosts to copy to other hosts. This therefore dramatically decreases the time required to synchronise the files.

It is assumed that the host that msync is running on contains the directory/files to be synchronised.

msync [-h] -d DESTINATIONS -p PATH [-v] [-n] [-c COPIESPERHOST]

optional arguments:
  -h, --help            show this help message and exit
  -d DESTINATIONS, --destinations DESTINATIONS
                        Comma separated list of destination hosts
  -p PATH, --path PATH  Source path to copy via rsync
  -v, --verbose         Turn on debug messages
  -n, --dry-run         Perform a dry-run - do not copy anything
  -e, --erase           Delete files not present on destination hosts - sets
                        --delete on rsync commands
  -c COPIESPERHOST, --copies-per-host COPIESPERHOST
                        Number of copies to perform per host (default = 1)

It issumed that:

• rsync has been installed on all hosts
• all hosts can ssh to each other password-less

Examples

Synchronise a file to 4 servers

./msync -d server1,server2,server3,server4 -p /home/neil/my.iso

Synchronise a directory to 4 servers

./msync -d server1,server2,server3,server4 -p /home/neil/my_dir

Synchronise a directory to 4 servers using 2 copy processes per host

./msync -d server1,server2,server3,server4 -p /home/neil/my_dir -c 2

Perform a dry-run of a directory synchronise to 4 servers using 2 copy processes per host

./msync -d server1,server2,server3,server4 -p /home/neil/my_dir -c 2 -n