ssh-copy-id命令来自英文词组“ssh copy id”，中文译为“复制SSH信息”，其功能是用于将本地生成的SSH公钥信息复制到远程主机。通常情况下，运维人员会先使用ssh-keygen命令生成出SSH密钥对文件，随后使用ssh-copy-id命令将公钥文件复制到远程主机上，这样操作后再进行远程SSH访问时将无须进行账号密码的口令验证，而是通过密钥方式登录。

语法格式：ssh-copy-id [参数] 域名或IP地址

常用参数：

-f强制复制而不询问
-i设置公钥文件路径
-n仅测试，而不实际操作
-p设置使用的端口号

参考示例

将SSH公钥文件复制到远程主机：

[root@linux-arae-cc ~]# ssh-copy-id 192.168.10.10
The authenticity of host '192.168.10.10 (192.168.10.10)' can't be established.
ECDSA key fingerprint is SHA256:212/FhZ+6JFs5psuMJx9+5alyW6QDzviE0miulDPiKk.
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@192.168.10.10's password: 此处输入远程主机管理员密码
Number of key(s) added: 1
Now try logging into the machine, with:   "ssh '192.168.10.10'"
and check to make sure that only the key(s) you wanted were added.