第一步: 产生公钥与私钥对：
|
1
|
[root@local-host]# ssh-keygen -t rsa
|
按照提示输入完后，会在~/.ssh目录下生成id_rsa和id_rsa.pub这两个文件
第二步:用ssh-copy-id将公钥复制到远程机器中
ssh-copy-id 将本机的公钥复制到远程机器的authorized_keys文件中，ssh-copy-id也会给远程主机的用户主目录(home)和 ~./ssh 和 ~/.ssh/authorized_keys设置合适的权利。
语法：
|
1
|
ssh-copy-id [-i [identity_file]] [user@]machine
|
选项：
|
1
|
-i:指定公钥文件
|
实例：
把本地的ssh公钥文件安装到远程主机对应的账户下：
|
1
2
3
4
5
6
7
8
|
[root@local-host]# ssh-copy-id -i ~/.ssh/id_rsa.pub remote-host
root@remote-host's password: #输入远程主机的用户密码
Now try logging into the machine, with "ssh 'remote-host'", and check in:
.ssh/authorized_keys
to make sure we haven't added extra keys that you weren't expecting.
|
第三步: 登录到远程机器不用输入密码
|
1
2
|
[root@local-host]# ssh remote-host
Last login: Mon Sep 11 18:30:00 2017 from remote-host
|
常见问题：
|
1
2
|
[root@local-host]# ssh-copy-id -u demo -i ~demo/.ssh/id_rsa.pub demo@remote_host
/usr/bin/ssh-copy-id: ERROR: No identities found
|
上述是给demo用户赋予无密码登陆的权利
使用选项 -i ，当没有值传递的时候或者 如果 ~/.ssh/identity.pub 文件不可访问（不存在）, ssh-copy-id 将显示上述的错误信息 （ -i选项会优先使用将ssh-add -L的内容）
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
[root@local-host]# ssh-agent $SHELL
[root@local-host]# ssh-add -L
The agent has no identities.
[root@local-host]# ssh-add
Identity added: /home/demo/.ssh/id_rsa (/home/demo/.ssh/id_rsa)
[root@local-host]# ssh-add -L
ssh-rsa AAAAB3NUaC1TR2SJKAABIwAAAQEAsJIEILuftj8aSxMa3k8t6JvM79DpBV
aHreqPShTYp7kISDMUNzUpnyxsHpH1tQ/Ow== /home/demo/.ssh/id_rsa
[root@local-host]# ssh-copy-id -i remote-host
demo@remote-host's password:
Now try logging into the machine, with "ssh 'remote-host'", and check in:
.ssh/authorized_keys
to make sure we haven't added extra keys that you weren't expecting.
[Note: This has added the key displayed by ssh-add -L]
|
本文转自奔跑在路上博客51CTO博客，原文链接http://blog.51cto.com/qiangsh/1964412如需转载请自行联系原作者
qianghong000
