What is the best way to duplicate files on server via ssh?
In my case: I'm talking about duplicating magento shop. (15000 files ~ 50MB)
cp -a source destination
Is taking hours... (in my case server is 2.4 Xeon, 2GB RAM)
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Note that if you're on a slow link, or the server is under heavy load, the tool used for copying won't be the bottleneck, and any way of copying will be slow anyway.
This should give you the basic usage for copying between your local computer and the remote server: http://oreilly.com/pub/h/38
To copy from local computer to a remote server (you need to replace the paths, user name and host address, of course):
rsync -avz -e ssh /path/on/local/computer firstname.lastname@example.org:/path/on/server
-e ssh"use a SSH tunnel"
To copy in the other direction, switch the paths (first is from, second is to):
rsync -avz -e ssh email@example.com:/path/on/server /path/on/local/computer
But rsync is useful even for copying things around on the same server:
rsync -av /path-to/copy/from /path_to/copy/to
scp /path/on/local/computer firstname.lastname@example.org:/path/on/server
For one-shot deals, scp is handy. If it's a lot of files, then rsync is a good idea. If a connection is dropped, rsync can pick up where it left off.
I knew that rsync had compression (
-z), and have just learned that scp does as well (
In your setup, rsync is probably enough... but as a example, if there are many small files, it may be faster to tar the files first than transfer then via rsync. This is because transfering the owner, timestamps, permissions is sometime heavier than the file itself if the file is small. Tar will merge all that info in one file and rsync will copy bigger blocks.
Or even better, if no security is needed, use tar and nc:
On destination, prepare a receiving daemon, uncompress and untar:
nc -l -p 12345 | pigz -d | tar xvf -
On the source, tar everything, parallel compress and send it to the destination:
tar cvf - ./ | pigz | nc host 12345