[root@ceshi .ssh]# which ssh-copy-id
/usr/bin/which: no ssh-copy-id in (/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin)
[root@ceshi ~]# ssh-copy-id-i.ssh/id_rsa [email protected]
-bash: ssh-copy-id-i.ssh/id_rsa: 没有那个文件或目录

使用yum install openssh-clients  安装命令

有的系统没有此命令 有的系统缺省 就包含这一条命令！

但是我的测试机没有发现此命令 只能这样安装！

这时有报错了

[root@ceshi .ssh]# ssh-copy-id -i ./id_rsa [email protected]
ssh: Could not resolve hostname ./id_rsa: Name or service not known

这是因为没有解析主机名

[root@puttet ~]# hostname
abc
[root@ceshi .ssh]# vi /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.0.19 ceshi
192.168.0.20 abc
[root@ceshi .ssh]# ping abc
PING abc (192.168.0.20) 56(84) bytes of data.
64 bytes from abc (192.168.0.20): icmp_seq=1 ttl=64 time=0.322 ms
64 bytes from abc (192.168.0.20): icmp_seq=2 ttl=64 time=0.270 ms
^C
--- abc ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1300ms
rtt min/avg/max/mdev = 0.270/0.296/0.322/0.026 ms


这样就可以了

[root@ceshi .ssh]# ssh-copy-id -i ./id_rsa.pub  [email protected]
The authenticity of host '192.168.0.20 (192.168.0.20)' can't be established.
RSA key fingerprint is 7b:a4:ae:42:50:8b:27:82:1c:dc:66:a9:5a:cb:67:a2.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.0.20' (RSA) to the list of known hosts.
[email protected]'s password:
Now try logging into the machine, with "ssh '[email protected]'", and check in:
  .ssh/authorized_keys
to make sure we haven't added extra keys that you weren't expecting.

ok 可以使用了！

[root@puttet ~]# cd .ssh/authorized_keys