这篇文章主要介绍了Linux下实现免密码登录的相关资料，非常不错，具有参考借鉴价值，感兴趣的朋友一起看看吧
/etc/ssh/sshd_config要允许root远程登录：PermitRootLogin yes
1.Linux下生成密钥
ssh-keygen的命令手册，通过”man ssh-keygen“命令：
https://link.jianshu.com?t=http%3A%2F%2Ffiles.jb51.net%2Ffile_images%2Farticle%2F201610%2F2016101217190930.png
通过命令”ssh-keygen -t rsa“
生成之后会在用户的根目录生成一个 “.ssh”的文件夹
进入“.ssh”会生成以下几个文件
authorized_keys:存放远程免密登录的公钥,主要通过这个文件记录多台机器的公钥
id_rsa : 生成的私钥文件
id_rsa.pub ： 生成的公钥文件
know_hosts : 已知的主机公钥清单
如果希望ssh公钥生效需满足至少下面两个条件：
1) .ssh目录的权限必须是700
2) .ssh/authorized_keys文件权限必须是600
2.远程免密登录
原理图：
https://link.jianshu.com?t=http%3A%2F%2Ffiles.jb51.net%2Ffile_images%2Farticle%2F201610%2F2016101217190934.png 常用以下几种方法：
2.1 通过ssh-copy-id的方式
命令： ssh-copy-id -i ~/.ssh/id_rsa.put <romte_ip>
举例：
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[root@``test
.``ssh``]``# ssh-copy-id -i ~/.ssh/id_rsa.pub 192.168.91.135
[email protected]'s password:
Now try logging into the machine, with
"ssh '192.168.91.135'"``, and check
in``:
.``ssh``/authorized_keys
to
make
sure we haven``'t added extra keys that you weren'``t expecting.
[root@``test
.``ssh``]``# ssh [email protected]
Last login: Mon Oct 10 01:25:49 2016 from 192.168.91.133
[root@localhost ~]``#
常见错误：
[root@test ~]# ssh-copy-id -i ~/.ssh/id_
rsa.pub192.168.91.135
-bash: ssh-copy-id: command not found //提示命令不存在
解决办法：yum -y install openssh-clients
2.2 通过scp将内容写到对方的文件中
命令：scp -p ~/.ssh/id_
root@<remote_ip>:/root/.ssh/authorized_keys
[root@``test
.``ssh``]``# scp -p ~/.ssh/id_rsa.pub [email protected]:/root/.ssh/authorized_keys
[email protected]'s password:
id_rsa.pub 100% 408 0.4KB``/s
00:00
[root@``test
.``ssh``]``#
[root@``test
.``ssh``]``#
[root@``test
.``ssh``]``#
[root@``test
.``ssh``]``# ssh [email protected]
Last login: Mon Oct 10 01:27:02 2016 from 192.168.91.133
[root@localhost ~]``#
也可以分为两步操作：
$ scp ~/.ssh/id_
root@<remote_ip>:pub_key //将文件拷贝至远程服务器
$ cat ~/pub_key >>~/.ssh/authorized_keys //将内容追加到authorized_keys文件中， 不过要登录远程服务器来执行这条命令
2.3 通过Ansible实现批量免密
2.3.1 将需要做免密操作的机器hosts添加到/etc/ansible/hosts下：
[Avoid close]
192.168.91.132
192.168.91.133
192.168.91.134
2.3.2 执行命令进行免密操作
ansible <groupname> -m authorized_key -a "user=root key='{{ lookup('file','/root/.ssh/id_rsa.pub') }}'" -k
示例：
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[root@``test
sshpass-1.05]``# ansible test -m authorized_key -a "user=root key='{{ lookup('file','/root/.ssh/id_rsa.pub') }}'" -k
SSH password: ----->输入密码
192.168.91.135 | success >> {
"changed"``:
true``,
"key"``:
"ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEArZI4kxlYuw7j1nt5ueIpTPWfGBJoZ8Mb02OJHR8yGW7A3izwT3/uhkK7RkaGavBbAlprp5bxp3i0TyNxa/apBQG5NiqhYO8YCuiGYGsQAGwZCBlNLF3gq1/18B6FV5moE/8yTbFA4dBQahdtVP PejLlSAbb5ZoGK8AtLlcRq49IENoXB99tnFVn3gMM0aX24ido1ZF9RfRWzfYF7bVsLsrIiMPmVNe5KaGL9kZ0svzoZ708yjWQQCEYWp0m+sODbtGPC34HMGAHjFlsC/SJffLuT/ug/hhCJUYeExHIkJF8OyvfC6DeF7ArI6zdKER7D8M0SM WQmpKUltj2nltuv3w== [email protected]"``,
"key_options"``: null,
"keyfile"``:
"/root/.ssh/authorized_keys"``,
"manage_dir"``:
true``,
"path"``: null,
"state"``:
"present"``,
"unique"``:
false``,
"user"``:
"root"
}
[root@``test
sshpass-1.05]``#
2.4 手工复制粘贴的方式
将本地id_rsa.pub文件的内容拷贝至远程服务器的~/.ssh/authorized_keys文件中