how to transfer a file between 2 servers

graziano1968 · 08-13-2008, 03:35 AM

Hello

suppose I have a file.txt on server A (suppose it's a linux server) .

Which is the best , faster and safer way to transfer file.txt from server A to server B ?

Thank you

Rupertt · 08-13-2008, 03:39 AM

scp filea.txt user@target:/path/to/targetfolder

graziano1968 · 08-13-2008, 04:04 AM

Quote:

Originally Posted by Rupertt

scp filea.txt user@target:/path/to/targetfolder

Thank you , but how to enter the remote password in the command above (to avoid the prompt)

Rupertt · 08-13-2008, 04:09 AM

you cant, you have to login to server a and execute the command, then scp asks you for the password of server b

graziano1968 · 08-13-2008, 04:12 AM

Quote:

Originally Posted by Rupertt

you cant, you have to login to server a and execute the command, then scp asks you for the password of server b

In this case it's no good because I would use the command inside a php or perl script .

billymayday · 08-13-2008, 04:31 AM

Does scp use ssh keys if they are in place? I'd give that a go first. Otherwise, you can use rsync.

theYinYeti · 08-13-2008, 04:37 AM

You have to use ssh keys then.

Yves.

billymayday · 08-13-2008, 04:51 AM

Not with rsync

graziano1968 · 08-13-2008, 05:15 AM

Quote:

Originally Posted by billymayday

Not with rsync

ok I am trying to use rsync but ..

how to enter/set the remote password in the command below ?

# rsync -v -e ssh test.txt 12749292@mydomain.com:~

and how to avoid/skip with a "yes" this/following warning ?

The authenticity of host 'mydomain.com (14.4.12.30)' can't be established.
RSA key fingerprint is c2:65:d5:57:af:95:11:ec:87:d6:35:a0:8b:99:a1:70.
Are you sure you want to continue connecting (yes/no)?

Thank you

billymayday · 08-13-2008, 05:22 AM

You only get that warning the first time you attach

See --password-file option

graziano1968 · 08-13-2008, 05:27 AM

Quote:

Originally Posted by billymayday

You only get that warning the first time you attach

See --password-file option

the problem is that I need to avoid the warning always (also for the first time) because I should send the command with a php script. And for my purpouse the --password-file is not safe at all. I wish to put the password inside an encrypted php file (inluded with the command , but as it seems also rsync does not permit it, damn !).

billymayday · 08-13-2008, 06:27 AM

Have a look at "man rsyncd.conf". I'm pretty sure that if you define a module along the lines:

Code:

[data]
        path = /data
        use chroot = no
        read only = no
        uid = some_user
        gid = some_group

rsync will allow password-less connections (I can't connect to the server I have that does this at the moment)

theYinYeti · 08-13-2008, 06:37 AM

You can create a passord-less setup with keys on a given remote user (let's say REMOTE_USER) and then use rsync this way:

rsync -e 'ssh -x -l REMOTE_USER' …other options…

I actually use this command on a daily basis without any password:
rsync -rzlpt --ignore-errors --delete --max-size=3M -e "ssh -x -l remote_me" "server:/important/place" "/local/backup"

Yves.

graziano1968 · 08-13-2008, 07:01 AM

Quote:

Originally Posted by theYinYeti

You can create a passord-less setup with keys on a given remote user (let's say REMOTE_USER) and then use rsync this way:

rsync -e 'ssh -x -l REMOTE_USER' …other options…

I actually use this command on a daily basis without any password:
rsync -rzlpt --ignore-errors --delete --max-size=3M -e "ssh -x -l remote_me" "server:/important/place" "/local/backup"

Yves.

I never used ssh key , could you be more detailed (I'm lost)?

billymayday · 08-13-2008, 04:08 PM

man ssh-keygen is a pretty complete guide