运维开发网

Linux-免密ssh登陆

运维开发网 https://www.qedev.com 2020-04-01 07:18 出处:网络
IP要能ping通 关闭防火墙 [[email protected] tdd]# systemctl stop firewalld [[email protected] tdd]# systemctl disable firewalld [[email protected] tdd]# vim /etc/selinux/config

IP要能ping通

关闭防火墙

[[email protected] tdd]# systemctl stop firewalld

[[email protected] tdd]# systemctl disable firewalld

[[email protected] tdd]# vim /etc/seLinux/config

修改SELinux=disabled

[[email protected] tdd]# reboot

修改hostname

[[email protected] tdd]# uname -n

localhost.localdomain

修改配置文件 /etc/hostname 保存退出

[[email protected] tdd]# vim /etc/hostname

master

在每台机器的/etc/hosts文件中添加如下内容:

[[email protected] tdd]# vim /etc/hosts

192.168.44.10 master

192.168.44.11 slave1

192.168.44.12 slave2

同步系统时间

[[email protected] tdd]# date

Fri Mar 29 04:50:21 CST 2019

[[email protected] tdd]# hwclock

Fri 29 Mar 2019 04:50:27 AM CST -0.666422 seconds

[[email protected] tdd]# hwclock -w

[[email protected] tdd]# ntpdate time.nist.gov

28 Mar 20:50:47 ntpdate[2847]: step time server 132.163.96.2 offset -28799.219966 sec

[[email protected] tdd]# hwclock -w

[[email protected] tdd]# date

Thu Mar 28 20:51:23 CST 2019

如果上面time.nist.gov服务器同步不了,可以换下面几个时间服务器试试:

time.nist.gov

time.nuri.net

0.asia.pool.ntp.org

1.asia.pool.ntp.org

2.asia.pool.ntp.org

3.asia.pool.ntp.org

ssh互信

在master上操作:

首先生成密钥对

[[email protected] ~]# ssh-keygen -t rsa (提示时,直接回车即可)

导入本机

[[email protected] .ssh]# cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

再将master自己的公钥拷贝并追加到slave1、slave2的授权列表文件authorized_keys中

[[email protected] ~]# ssh-copy-id -i id_rsa [email protected]

[[email protected] ~]# ssh-copy-id -i id_rsa [email protected]

在slave*上操作:

同master只是@后是其他的机器的hostname

  • 这里用hostname是因为在hosts文件中配置了映射

测试

master:

[[email protected] .ssh]# ssh slave2

Last failed login: Fri Mar 29 05:08:05 CST 2019 on pts/0

There were 2 failed login attempts since the last successful login.

Last login: Thu Mar 28 21:18:56 2019

[[email protected] ~]# ssh slave1

Last failed login: Thu Mar 28 21:24:44 CST 2019 from slave2 on ssh:notty

There was 1 failed login attempt since the last successful login.

Last login: Thu Mar 28 21:21:04 2019 from master

[[email protected] ~]# ssh master

Last login: Thu Mar 28 21:12:29 2019

[[email protected] ~]#

slave1:

[[email protected] .ssh]# ssh slave2

Last failed login: Fri Mar 29 05:08:05 CST 2019 on pts/0

There were 2 failed login attempts since the last successful login.

Last login: Thu Mar 28 21:30:35 2019 from master

[[email protected] ~]# ssh master

Last login: Thu Mar 28 21:27:28 2019 from slave1

[[email protected] ~]# ssh slave1

Last login: Thu Mar 28 21:27:23 2019 from slave2

[[email protected] ~]#

slave2:

[[email protected] .ssh]# ssh slave1

Last login: Thu Mar 28 21:28:15 2019 from master

[[email protected] ~]# ssh master

Last login: Thu Mar 28 21:28:08 2019 from slave2

[[email protected] ~]# ssh slave2

Last failed login: Fri Mar 29 05:08:05 CST 2019 on pts/0

There were 2 failed login attempts since the last successful login.

Last login: Thu Mar 28 21:31:21 2019 from slave1

[[email protected] ~]#

[[email protected] ~]# exit

logout

Connection to slave2 closed.

[[email protected] ~]# exit

logout

Connection to master closed.

[[email protected] ~]# exit

logout

Connection to slave1 closed.

[[email protected] .ssh]#

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