If you wish to use above command in cron jobs or scripts then consider SSH keys to get rid of the passwords. In this example, restore tar backup over ssh session from the remote machine to local dir: $ cat | ssh "cd /path/to/dest/ tar zxvf -" # tar cvzf - /wwwdata | ssh $(mt -f /dev/nst0 rewind cat > /dev/nst0)$ How to extract tar over ssh One can can use mt command to rewind tape and then dump it using cat command: # tar cvzf - /wwwdata | ssh "cat > /dev/nst0" # tar cvzf - /It is also possible to dump backup to remote tape device: You can also use dd command for clarity purpose: You can read more about tape drives naming convention used under Linux here. The default first SCSI tape drive under Linux is /dev/st0. $ ssh 'tar czf - /home/vivek' | tar xvzf -C /home/vivek Use tar command through network over SSH session for tape device Open the terminal on x230 laptop and run the ssh command along with tar command: The problem with scp and other command copying the directory structure is that Symbolic links, special devices, sockets, named pipes, and other stuff not copied. # ssh 'dd if=prod-disk-hostname-sdvf-dd-mm-yyyy.img' | dd of=/dev/sdvf Moving data to a new Linux system For instance, we can restore a local hard disk drive from the image stored on the remote AWS EC2 cloud backup server as follows: To restore a local drive from the image on the server, reverse the command. # dd if=/dev/sdvf | ssh 'dd of=prod-disk-hostname-sdvf-dd-mm-yyyy.img' Let us copy the entire hard disk drive named /dev/sdvf from local machine to the remote AWS EC2 cloud backup server: $ ssh 'tar zcf - /some/dir' | tar zxf - Linux system hard drive backup/mirror using tar and ssh # tar zcvf - /Use of tar command over ssh sessionsĬopying from the remote machine () to local system is as follows: To avoid this problem pass the -t option to the ssh command: Sudo: sorry, you must have a tty to run sudo Please note that you may get an error that read as follows with ssh command when using with sudo or any other command that needs a pseudo-terminal allocation: $ tar zcf - /data2/ | gpg -e | ssh 'cat - > .gpg' In this example archive /data2/ with gpg: # tar zcvf - /Sample outputs: tar: Removing leading `/' from member names The following command backups /(IP 192.168.1.201) host over ssh session: $ ssh 'cd /dir1/ & tar -cf - file | gzip -9' > I hope this tutorial will help you to understand SSH key generation and copy the file at the remote end.The syntax is as follows to ssh into box and run the tar command: In this tutorial, we learned how to generate the SSH authentication key in CentOS8 and copy the file over the SSH without entering the password. Save the configuration file and restart the service using the following command. In this case, enable the SSH authentication key, for this open up the /etc/ssh/sshd_config, and enable or add the following lines. Sometimes you need to require to configure the SSH at the remote side for authentication. It will copy your text file to the remote server, for verification go to the remote side and verify that your file has been copied. To copy the file on the remote side using the following command. Repeat all of the above processes on the remote side if you want two-way communication. You can verify it by using the following command to view your SSH key.Ĭopy the SSH to the remote side, use the following command. Next, it will prompt you to enter the passphrase, leave it empty, and press enter. To save the file in a suggested directory press enter. # ssh-keygen –t rsaĪfter entering the above command, the following output should appear. To tighten up the security, you can mention the encryption algorithm according to your need, as shown below. Now I am going to generate the SSH key, using the following command. To verify, open up the terminal and type the following command. Firstly, verify the SSH is installed or not. Generate SSH Keyīefore generating the SSH Key. In this tutorial, you will learn how to generate an SSH key and copy files over SSH (SCP) without entering a password in CentOS8. There are two methods to connect with the remote server using SSH, one is by using password authentication, and another way is to authenticate is by public key. SSH (Secure Shell) is an encrypted protocol to connect with the remote device.
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