免密登入，执行另一个服务器的脚本

免密

root@Kylin:~# ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): 
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:
SHA256:3XYLrXCx2e/sstzoOM/+X5rLsTnHilPKpfOw80zE8KY root@Kylin
The key's randomart image is:
+---[RSA 2048]----+
|                 |
|                 |
|            o    |
|         . . X   |
|        S o B O  |
|           + Boo |
|           .E=+.o|
|            O@o@+|
|            +@^XO|
+----[SHA256]-----+
root@Kylin:~# ssh-copy-id -i .ssh/id_rsa.pub root@192.168.0.125
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: ".ssh/id_rsa.pub"
The authenticity of host '192.168.0.1   (192.168.0.1  )' can't be established.
ECDSA key fingerprint is SHA256:7I1eiKQFsSyGRuQzh2ogbJKh6v7WBNmm0n0A5kzzD8U.
Are you sure you want to continue connecting (yes/no)? yes
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
root@192.168.0.1's password: 

输入后完成
本服务器脚本内容

#!/bin/bash
ssh root@IP <<remotessh
mkdir test
ls -la test
ifconfig
exit
#内容
remotessh#结束