[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 root@192.168.0.20-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 root@192.168.0.20ssh: Could not resolve hostname ./id_rsa: Name or service not known

这是因为没有解析主机名

[root@puttet ~]# hostnameabc[root@ceshi .ssh]# vi /etc/hosts127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4::1         localhost localhost.localdomain localhost6 localhost6.localdomain6192.168.0.19 ceshi192.168.0.20 abc[root@ceshi .ssh]# ping abcPING 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 ms64 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 1300msrtt 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  root@192.168.0.20The 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)? yesWarning: Permanently added '192.168.0.20' (RSA) to the list of known hosts.root@192.168.0.20's password:Now try logging into the machine, with "ssh 'root@192.168.0.20'", and check in:  .ssh/authorized_keysto 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