centos ssh免密码秘钥登录
2016-05-27 04:11
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假设从A主机ssh登录B主机,用秘钥代替密码,步骤如下:
1、在A主机上执行:ssh-keygen -t rsa
一切默认,不用输入密码,生成两个文件:
/root/.ssh/id_rsa
/root/.ssh/id_rsa.pub
2、生成authorized_keys文件:
touch /root/.ssh/authorized_keys
cat /root/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys
chmod 700 /root/.ssh/id_rsa
3、把authorized_keys文件拷贝到B主机上:
scp /root/.ssh/authorized_keys root@xx.xx.xx.xx:/root/.ssh/
如果B主机上没有/root/.ssh目录,则先登录到B主机上执行ssh-keygen -t rsa,再拷贝authorized_keys文件。
4、完成
5、如果以后某个主机的IP发生了调整,SSH时出现如下错误,按照前面的操作重新执行一遍即可。
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
a0:70:17:12:e3:3c:ed:ae:1c:2b:b7:2a:10:c7:bf:8f.
Please contact your system administrator.
Add correct host key in /root/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /root/.ssh/known_hosts:8
ECDSA host key for 10.2.169.48 has changed and you have requested strict checking.
Host key verification failed.
1、在A主机上执行:ssh-keygen -t rsa
一切默认,不用输入密码,生成两个文件:
/root/.ssh/id_rsa
/root/.ssh/id_rsa.pub
2、生成authorized_keys文件:
touch /root/.ssh/authorized_keys
cat /root/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys
chmod 700 /root/.ssh/id_rsa
3、把authorized_keys文件拷贝到B主机上:
scp /root/.ssh/authorized_keys root@xx.xx.xx.xx:/root/.ssh/
如果B主机上没有/root/.ssh目录,则先登录到B主机上执行ssh-keygen -t rsa,再拷贝authorized_keys文件。
4、完成
5、如果以后某个主机的IP发生了调整,SSH时出现如下错误,按照前面的操作重新执行一遍即可。
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
a0:70:17:12:e3:3c:ed:ae:1c:2b:b7:2a:10:c7:bf:8f.
Please contact your system administrator.
Add correct host key in /root/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /root/.ssh/known_hosts:8
ECDSA host key for 10.2.169.48 has changed and you have requested strict checking.
Host key verification failed.
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