Linux命令 ssh-copy-id 使用方法（将ssh 公钥上传到目标服务器进行免密登录）

ssh-copy-id 命令的 man 说明文档

说明文档比较简单，就不再赘述翻译了

SSH-COPY-ID(1)                                                  SSH-COPY-ID(1)

NAME
       ssh-copy-id - install your public key in a remote machine’s authorized_keys

SYNOPSIS
       ssh-copy-id [-i [identity_file]] [user@]machine

DESCRIPTION
       ssh-copy-id  is a script that uses ssh to log into a remote machine (presumably using a login password, so password authenti-
       cation should be enabled, unless you’ve done some clever use of multiple identities) It also changes the permissions  of  the
       remote  user’s  home,  ~/.ssh, and ~/.ssh/authorized_keys to remove group writability (which would otherwise prevent you from
       logging in, if the remote sshd has StrictModes set in its configuration).  If the -i option is given then the  identity  file
       (defaults  to  ~/.ssh/id_rsa.pub)  is used, regardless of whether there are any keys in your ssh-agent.  Otherwise, if this:
       ssh-add -L provides any output, it uses that in preference to the identity file.  If the -i option is used,  or  the  ssh-add
       produced no output, then it uses the contents of the identity file.  Once it has one or more fingerprints (by whatever means)
       it uses ssh to append them to ~/.ssh/authorized_keys on the remote machine (creating the file, and directory, if necessary)

SEE ALSO
       ssh(1), ssh-agent(1), sshd(8)

OpenSSH                        14 November 1999                 SSH-COPY-ID(1)

使用示例

[root@localhost .ssh]# ssh-copy-id -i id_rsa.pub root@93.xx.xx.xx -p 27073
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "id_rsa.pub"
The authenticity of host '[93.xx.xx.xx]:27073 ([93.xx.xx.xx]:27073)' can't be established.
RSA key fingerprint is SHA256:uTxnRGKSmlgPgUD8Qaerf7Hgun0V7PLc5kKoHKnj3JI.
RSA key fingerprint is MD5:6b:0d:59:9e:e0:c5:c2:95:99:2a:c0:a4:b1:4c:af:a0.
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@93.xx.xx.xx's password: 

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh -p '27073' 'root@93.xx.xx.xx'"
and check to make sure that only the key(s) you wanted were added.

登录测试

ssh -p ‘27073’ ‘root@93.xx.xx.xx’
通过上面命令，不用输入密码直接可以登录目标服务器