Automated Backups With rdiff-backup

[Hans]

At this time i try to setup rdiff according "Automated Backups With rdiff-backup" at URL http://www.howtoforge.com/linux_rdiff_backup

After the command:
ssh-copy-id -i ~/.ssh/id_rsa.pub root@server1.example.com

An error occurs:

21
/usr/bin/ssh-copy-id: ERROR: No identities found

And i do not understand why...

Anyone knows what could be wrong?


Hans

[falko]

Did you follow the tutorial to the letter? Maybe you made a typo somewhere.

[Hans]

Both servers are Debian servers.

STEP 1:
On the backup-server (backup.mydomain.tld) I gave the command:

apt-get install rdiff-backup

On the webserver (server1.mydomain.tld) I gave the command:

apt-get install rdiff-backup

STEP 2:
On backup.mydomain.tld I gave all the commands following from now on:

groupadd -g 3500 rdiff-backup
useradd -u 3500 -s /bin/false -d /backup -m -c "rdiff-backup" -g rdiff-backup rdiff-backup

su -m rdiff-backup
cd /backup
ssh-keygen -t rsa

I gave two times an <enter> according the How to.

I created the file /backup/.ssh/config using the command $ nano /backup/.ssh/config with this contents:

host server1_backup
hostname server1.mydomain.tld
user root
identityfile /backup/.ssh/id_rsa
compression yes
cipher blowfish
protocol 2

When I wanted to save this file I got a message in the nano editor, that I have no permission to save the file. I decided to switch to root, by giving the command su and gave the root’s password.

Now the file /backup/.ssh/config was created with the contents mentioned above.

Now I gave the command: chmod -R go-rwx /backup/.ssh

And finally the command:

ssh-copy-id -i ~/.ssh/id_rsa.pub root@server1.mydomain.tld

Then I receive the error on backup.mydomain.tld

21
/usr/bin/ssh-copy-id: ERROR: No identities found

Maybe I did something wrong, but I don’t think that I make a mistake by typing as I use Putty.
Cut and paste is not that difficult.

Can you help me further with this information?


Hans

[falko]

Originally Posted by Hans

When I wanted to save this file I got a message in the nano editor, that I have no permission to save the file. I decided to switch to root, by giving the command su and gave the root’s password.

You must be root during the whole tutorial!

[Hans]

I am a little further now but i did not succeed.

After these next two commands (at the end to test the backup) an error occurs:

cd /backup
rdiff-backup server1_backup::/boot boot

ssh: server1_backup: Name or service not known
Fatal Error: Truncated header string (problem probably originated remotely)

Couldn't start up the remote connection by executing

ssh -C server1_backup rdiff-backup --server

Remember that, under the default settings, rdiff-backup must be
installed in the PATH on the remote system. See the man page for more
information on this. This message may also be displayed if the remote
version of rdiff-backup is quite different from the local version (0.13.4).

I do not understand, i did everything exactly as in the how to...

What could this be? Please let me know.

Do I have this error because my backup-server is Debian 32 bit and my server 64 bit? If yes, i wonder if i can use rdiff-backup between these two servers...
And if yes, how to solve this problem?
Or is it recomended to use another backup system?


Hans

[falko]

Originally Posted by Hans

cd /backup
rdiff-backup server1_backup::/boot boot

ssh: server1_backup: Name or service not known
Fatal Error: Truncated header string (problem probably originated remotely)

The name server1_backup is not known by your system. Either enter server1_backup and its IP address in /etc/hosts, or use server1_backup's IP address, e.g.

rdiff-backup 192.168.0.100::/boot boot

[Hans]

On my backup server (backup.mydomain.tld) the file contents of /backup/.ssh/config is:

host server1_backup (This name is specified by me)
hostname server1.mydomain.tld (the name of the server to be back-upped).
user root
identityfile /backup/.ssh/id_rsa
compression yes
cipher blowfish
protocol 2

On my other server server1.mydomain.tld (=to be back-upped), the file contents of file /root/.ssh/authorized_keys is:

command="rdiff-backup --server --restrict-read-only /",from="FULL DNS NAME OF THE BACKUP-SERVER",no-port-forwarding,no-X11-forwarding,no-pty <the key>= rdiff-backup@backup.mydomain.tld


So i do not understand why the names are not recognised.
One more question:
My backup-server is not ping-able from the Internet.
Could that be a reason?

Hans

[Hans]

It seems so easy but it is not and it takes me a lot of time.
There is still something wrong, i do not understand!

At Step 4 at URL http://www.howtoforge.com/linux_rdiff_backup_p2

I gave the commands cd /backup
rdiff-backup server1::/boot boot

Then the server asks for a password (3 times)

Then an error occurs:

---
Permission denied (publickey,keyboard-interactive).
Fatal Error: Truncated header string (problem probably originated remotely)

Couldn't start up the remote connection by executing

ssh -C server1 rdiff-backup --server

Remember that, under the default settings, rdiff-backup must be
installed in the PATH on the remote system. See the man page for more
information on this. This message may also be displayed if the remote
version of rdiff-backup is quite different from the local version (0.13.4).

---
For information:

The contents of /backup/.ssh/config on the backup server is:

host server1
hostname server1.mydomain.tld
user root
identityfile /backup/.ssh/id_rsa
compression yes
cipher blowfish
protocol 2

[falko]

What's in /root/.ssh/authorized_keys on server1.example.com?

[Hans]

Falko,

for security reasons i give you the information in a private message.


Hans