rsyncTypical usage
rsync -avz --delete src dst
Beware of the trailing-slash on src/. If there is, its content will be replicated onto destination, not the folder.
Default behaviour
This does not only ignore timestamps, but also filesize
-I, --ignore-times don't skip files that match size and time
Therefore we need to ignore the timestamps only with
--size-only skip files that match in size
Instead of -a (which stands for -rlptgoD), you may also need to avoid p o g D in case you are re-generating some shit every time. Hence this is size-only.
rsync -rltvz --size-only --delete src dst
in case you need to maintain different file permissions on source and destination
rsync -rltvz --checksum --delete src dst
Only use compression (-z) if that is over the network and not dealing with already compressed archives like music, films or anything not worth the cpu overhead.
dst/ doesn’t have to exist yet, rsync eventually creates it
Eventually switch to --rsh=rsh to speed up the process on a trusted network
Eventually add e.g. -e "ssh -palt_port" to tune SSH client options
Something usefull you might want to add to your scripts, not to cumulate rsync processes in parallel,
tmp=`ps aux | grep rsync | grep -v grep` [[ -n `ps ax | grep rsync | grep -v grep` ]] && cat <<-EOF && exit 1 RSYNC IS ALREADY RUNNING, ABORDING $̂tmp EOF unset tmp
One rsync job may have two child processes, in the end you have three
make a backup first
ssh $dest cp -a $target/ $target.bkp/
proceed with the dual sync
ssh $source tar czpf - ABSOLUTE-PATH/| ssh $dest tar xzpf - -C / -P
see what changed
ssh $dest diff -rbu --brief $target.bkp/ $target/
and do not forget to reload the daemon when needed on destination server
bash: line 1: rsync: command not found
==> you need rsync installed on both ends
Parallelized rsync-like clone https://github.com/pscedu/psync
Why does rsync spawn multiple processes for me? http://serverfault.com/questions/547165/why-does-rsync-spawn-multiple-processes-for-me
Why does rsync forks itself? And why one such forked process is almost kinda idle (as seen in iotop)? http://serverfault.com/questions/460423/why-does-rsync-forks-itself-and-why-one-such-forked-process-is-almost-kinda-idl
https://stackoverflow.com/questions/1602324/how-do-i-synchronize-in-both-directions –> –update
https://unix.stackexchange.com/questions/183504/how-to-rsync-files-between-two-remotes
https://serverfault.com/questions/449705/why-is-it-not-possible-to-use-two-remotes-for-rsync