This document provides instructions for copying files between Linux machines using scp and ssh without passwords. It describes generating an SSH key pair on both machines, copying the public key to the authorized_keys file on the destination server. It then explains how to use the scp command along with the private key to copy files from the source server to a destination directory on the destination server. It also provides a cron job example to automatically copy files from the source server to the destination server every two minutes.

1. PREPARED BY RAVI KUMAR LANKE Page 1
Copying files between linux machines using scp
and ssh without linux user passwords

2. PREPARED BY RAVI KUMAR LANKE Page 2
1. Setup ssh keys on both machines
To generate a public / private key pair :
$ ssh-keygen -t rsa
The above will generate 2 files, ~/.ssh/id_rsa (private key) and /home/ oracle /.ssh/id_rsa.pub (public key)
To setup the SSH keys for usage (one time task) : Copy the contents of /home/ oracle /.ssh/id_rsa.pub of source server and paste in a new line
of /home/ oracle /.ssh/authorized_keys of destination server
If /home/oracle/.ssh/authorized_keys doesn't exist, feel free to create it.
2. To copy files use the below command
change to destination directory in destination server and run the below command
$scp -i ~/.ssh/id_rsa oracle@source_server_hostname:/u01/oracle/backup/*.* .
Cron job :
make a shell script as below and save it as filescopy.sh:
#!/bin/sh
backup_dir="/home/oracle/ backup"
cd $backup_dir
scp -i ~/.ssh/id_rsa oracle@source_server_hostname:/home/oracle/backup/*.* .
Now run the cron job on the destination server with above script
$crontab -e
Enter the below line
*/2 * * * * /u01/filescopy.sh > /u01/backup.log 2>&1
save and exit
It will copy the files into the destination server for every 2 sec.