ssh免密钥登录配置

Siyah

2019 年 03 月 27 日

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linux系统配置ssh免密钥登录

**1. 执行 ssh-keygen -t rsa，一路回车，生成公钥和私钥**

```
-t type 指定要创建的密钥类型。

可以使用：
rsa1：(SSH-1)
rsa：(SSH-2)
dsa：(SSH-2)
```

![ssh.png](http://erica.kkwen.cn/usr/uploads/2019/03/3204085734.png)

```
当前家目录中，
/root/.ssh/id_rsa 是私钥
/root/.ssh/id_rsa.pub 是公钥
```
**2. 将公钥文件传传给远程主机，输入远程主机对应的密码**
```bash
[root@ _86_ ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.11.128
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
The authenticity of host '192.168.11.128 (192.168.11.128)' can't be established.
ECDSA key fingerprint is SHA256:9VSEl5VrvJIV9v1UxBiHmBnKIkVBjfNqVGgsUrG4VeI.
ECDSA key fingerprint is MD5:65:3a:b4:a5:14:05:21:dc:9c:fb:90:a3:dd:8e:00:fb.
Are you sure you want to continue connecting (yes/no)? yes
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
root@192.168.11.128's password:

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'root@192.168.11.128'"
and check to make sure that only the key(s) you wanted were added.
```
```
本质上该步骤是将公钥是放在远程主机192.168.11.128 的
/root/.ssh/authorized_keys 这个文件中
```
**3. 此时远程登录主机ssh root@192.168.11.128,不会再输入密码**
![ssh-.png](http://erica.kkwen.cn/usr/uploads/2019/03/2487442096.png)

**4. 基本思路**
```
ssh密钥对登录基本思路就是需要免密钥登录谁，就将公钥放在谁上面
位置是/root/.ssh/authorized_keys
```

ssh免密钥登录配置

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