centos password free remote replication scp


Why is there such a need? Because the server is load balanced and has multiple nodes, and now it is automatically deployed, it can't be deployed once on each node, right? If it is deployed on a server,

It is convenient to copy directly and remotely to other servers, but since scp needs to enter password and script is troublesome, it is necessary to establish a mutual trust connection between the two machines. There are

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Get ready

Virtual machine: as A as B
System: centos 6.5 64 bit

Result: A does not need to password SCP file to B


1,use ssh Sign in A,input ssh-keygen -b 4096 -t rsa  ,Just press enter all the time.

   //The display is approximately as follows:
	Generating public/private rsa key pair.
	Enter file in which to save the key (/root/.ssh/id_rsa): 
	Created directory '/root/.ssh'.
	Enter passphrase (empty for no passphrase): 
	Enter same passphrase again: 
	Your identification has been saved in /root/.ssh/id_rsa.
	Your public key has been saved in /root/.ssh/id_rsa.pub.
	The key fingerprint is:
	e5:81:a9:33:14:87:28:ae:37:4b:17:f3:e4:4a:4d:e1 root@waiyin1
	The key's randomart image is:
	+--[ RSA 2048]----+
	|     ....        |
	|  . . oo o       |
	| . . ...o o      |
	|  . o.E. o .     |
	| .   O+ S .      |
	|. + o +o         |
	| o = .           |
	|  . .            |
	|                 |

	//After execution, a pair of secret keys will be generated in the directory / root/.ssh /. Where 'id_rsa.pub' is the public key and 'id_rsa' is the private key;
2,hold id_rsa.pub Copy to B Server./ssh Directory, and change the name to authorized_keys, Input:

  scp -p /root/.ssh/id_rsa.pub root@
  root@'s password:        ---input B Password for the server
  scp: /root/.ssh/authorized_keys: No such file or directory,Prompt there is no such directory
  SSH Get into**B The server**Function: ssh-keygen -b 4096 -t rsa,Then run: scp -p /root/.ssh/id_rsa.pub root@
  root@'s password:  ---input B Password for the server
  //Note: the contact has been established. A t this time, you can try scp to copy files to server B without entering password!


To sum up, if you want server A to make A password free remote service to server B, you need to put the public key generated by A to server B, as well as scp to server C.

Tags: ssh CentOS

Posted on Sat, 21 Mar 2020 13:47:05 -0400 by donbonzo