Linux SSH multiple machines without password communication

(This is the case for root user)

First, 3 machines, we take two workers, a boss for example

192.168.1.1 boss

192.168.1.2 Worker1

192.168.1.3 Worker2

1, Vim/etc/sysconfig/network

Modified hostname to BOSS,WORKER1 on 3 machines respectively, Worker2

2.vim/etc/hosts set the following configuration in 3 machines respectively.

192.168.1.1 boss

192.168.1.2 Worker1

192.168.1.3 Worker2

3. Execute ssh-keygent-t RSA generate encryption Key

Cd/root/.ssh and view LS

The public key id_rsa.pub is now generated

4. Cat ~/.ssh/id_rsa.pub >>~/.ssh/authorized_keys

(Ps:authorized_keys is used to save the public key content of all users who are allowed to log on to the ssh client as the current user)

Verify that a single machine can log on using SSH

SSH localhost

The first time will prompt

Performed separately on the worker

SCP id_rsa.pub [Email protected]:/root/.ssh/id_pub.pub.worker1

SCP id_rsa.pub [Email protected]:/root/.ssh/id_pub.pub.worker2

Then execute on the Boss node

Cat ~/.ssh/id_rsa.pub.worker1 >> ~/.ssh/authorized_keys

Cat ~/.ssh/id_rsa.pub.worker2 >> ~/.ssh/authorized_keys

Then the Authorized_keys SCP of the Boss node to each node

SSH worker 1 is executed at this time

There will be a login, and you are already logged into the target machine

This enables the non-cipher communication of each machine.

Linux SSH multiple machines without password communication