在配置SSH免密登录时报错：/usr/bin/ssh-copy-id: ERROR: failed to open ID file '/root/.pub': 没有那个文件或目录

问题

[root@hadoop1 sbin]# ssh-copy-id hadoop1

/usr/bin/ssh-copy-id: ERROR: failed to open ID file '/root/.pub': 没有那个文件或目录
	(to install the contents of '/root/.pub' anyway, look at the -f option)

解决方法

[root@hadoop1 sbin]# ssh-keygen -t dsa
Generating public/private dsa key pair.
Enter file in which to save the key (/root/.ssh/id_dsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_dsa.
Your public key has been saved in /root/.ssh/id_dsa.pub.
The key fingerprint is:
SHA256:eNitxI+ZXMbqTHnZzQnql31bC+klM1ivGdhCQRssWhg root@hadoop1
The key's randomart image is:
+---[DSA 1024]----+
|       Eo .o     |
|       . o..o    |
|        o .o     |
|       * o  .    |
|      o S =...   |
|       + @.+=+o. |
|        X =+.@+o.|
|       + o  = @ +|
|        o .. + +.|
+----[SHA256]-----+

再次 ssh-copy-id hadoop1

[root@hadoop1 sbin]# ssh-copy-id hadoop1
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_dsa.pub"
/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@hadoop1's password:

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'hadoop1'"
and check to make sure that only the key(s) you wanted were added.