Use scp to transfer files between servers without Password

1. 1. Run the ssh-keygen-t rsa command on server.
2. 2. Three carriage returns
3. 3. In the user's directory ~ /. Ssh/generate two files: id_rsa, id_rsa.pub
4. 4. Copy the corresponding file under server a to server B and rename it authorized_keys.
   1. Scp/root/. ssh/id_rsa.pub root@10.0.1.22:/root/. ssh/authorized_keys
      
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      2. Scp command:
      3. Scp command description

         Scp-secure copy (remote file copy tool)

         Syntax:

         Scp [-1245 BCpqrv] [-c cipher] [F ssh_config] [-I identity_file] [-l limit] [-o ssh_option] [-P port] [-S program] [[user @] host1:] file1 […] [[Suer @] host2:] file2

         Note:

         Scp Copies files between hosts. It uses ssh (1) for data transmission. And use the same authentication and security. Scp requests for password input during authentication. All files may need a special description from the server and the user to indicate that the file will be copied to/from a server. File Replication between two remote login servers is allowed.

         Option:
         • -1 force scp Protocol 1
         • -2 force scp Protocol 2
         • -4 force scp to use IPV4 URLs
         • -6 force scp to use IPV6 URLs
         • -B. Select the batch processing mode (to prevent password input)
         • -C allows compression. Mark-C to ssh (1) to allow Compression
         • -Cipher: Select cipher to encrypt data transmission. This option is passed directly to ssh (1)
         • -F ssh_config: Set a variable user configuration to ssh. This option will be passed directly to ssh (1)
         • -I identity_file: select the file that is RSA-authenticated to read the private password. This option can be passed directly to ssh (1)
         • -L limit limits the transmission bandwidth, that is, the Kbit/s speed for the speed.
         • -O ssh_option can upload the configuration format in ssh_config to ssh. This mode is helpful for scp that does not have an independent scp file interrupt character.
         • -P port specifies the remote connection port. Note that this option must be written in uppercase. Because-p has reserved the number and mode.
         • -S program specifies an encryption program. This program must read all ssh (1) options.
         • -P specifies the number of modifications, connections, and the mode of the original file.
         • -Q: Turn off the progress parameter.
         • -R Recursively copies the entire folder
         • -S program specifies an encryption program. This program must read all ssh (1) options.
         • -V redundancy mode. Let scp and ssh (1) print their troubleshooting information, which is useful in troubleshooting connections, authentication, and configuration. Example:
         • Copy local directory to remote directory
         • Scp-r/home/test/root@10.0.1.22:/root/
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         • Copy a single local file to remote
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         • Scp/home/test/test.txt root@10.0.1.22:/root/
           
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         • Remote File Download to local
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         • Scp-r root@10.0.1.22:/root // home/test/new/
           
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