ssh连接

1启动sshd时,报“Could not load host key”错
分类: 系统运维2016-05-24 01:05:18
现象:启动sshd服务时,虽看似服务启动成功,但客户端并不能连接上sshd服务器端。
如下:
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[root@aefe8007a17d ~]# /usr/sbin/sshd
Could not load host key: /etc/ssh/ssh_host_rsa_key
Could not load host key: /etc/ssh/ssh_host_ecdsa_key
Could not load host key: /etc/ssh/ssh_host_ed25519_key

原因:

  1. 从提示信息看是sshd守护进程不能加载主机密钥文件,因为找不到这些密钥文件(配置文件/etc/ssh/sshd_config中已定义密钥文件名与路径);
  2. 一般openssh服务正常安装后,主机会自动生成相应的主机密钥文件,但这里因未知原因并没有完成这一步动作,导致无法远程ssh连接。

检查密钥文件是否存在(还有一种现象为:密钥文件存在,但文件大小为0):
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[root@aefe8007a17d ~]# ll /etc/ssh/
total 252
-rw-r–r-- 1 root root 242153 Mar 21 22:18 moduli
-rw-r–r-- 1 root root 2208 Mar 21 22:18 ssh_config
-rw------- 1 root root 4361 Mar 21 22:18 sshd_config

重新生成主机密钥文件:

  1. 生成rsa_key (-t表示生成的密钥所使用的加密类型;-f项后接要生成的密钥文件名);
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[root@aefe8007a17d ~]# ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key
Generating public/private rsa key pair.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /etc/ssh/ssh_host_rsa_key.
Your public key has been saved in /etc/ssh/ssh_host_rsa_key.pub.
The key fingerprint is:
5e:2d:19:51:b1:e3:e0:60:65:53:e4:14:f8:d8:38:af root@aefe8007a17d
The key’s randomart image is:
±-[ RSA 2048]----+
| ==Bo |
| o.= . |
| o o=+ |
| . o+*o. |
| S =oo |
| . . … |
| . . |
| E |
| |
±----------------+
[root@aefe8007a17d ~]# ssh-keygen -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key

  1. 生成ecdsa_key;
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    [root@aefe8007a17d ~]# ssh-keygen -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key
  2. 生成ed25519_key。
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[root@aefe8007a17d ~]# ssh-keygen -t ed25519 -f /etc/ssh/ssh_host_ed25519_key

再次检查密钥文件是否存在且合规,可以看到已生成相应主机密钥文件(实际上主机密钥文件为私钥,.pub文件为公钥):
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[root@aefe8007a17d ~]# ll /etc/ssh/
total 276
-rw-r–r-- 1 root root 242153 Mar 21 22:18 moduli
-rw-r–r-- 1 root root 2208 Mar 21 22:18 ssh_config
-rw------- 1 root root 227 May 22 16:48 ssh_host_ecdsa_key
-rw-r–r-- 1 root root 179 May 22 16:48 ssh_host_ecdsa_key.pub
-rw------- 1 root root 411 May 22 16:48 ssh_host_ed25519_key
-rw-r–r-- 1 root root 99 May 22 16:48 ssh_host_ed25519_key.pub
-rw------- 1 root root 1679 May 22 16:48 ssh_host_rsa_key
-rw-r–r-- 1 root root 399 May 22 16:48 ssh_host_rsa_key.pub
-rw------- 1 root root 4361 Mar 21 22:18 sshd_config

此时客户端可ssh连接上sshd服务器端:
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[root@localhost ~]# ssh 172.17.0.2
The authenticity of host ‘172.17.0.2 (172.17.0.2)’ can’t be established.
ECDSA key fingerprint is 37:2a:69:46:c4:bd:92:b2:43:b4:cc:42:41:8e:12:2e.
Are you sure you want to continue connecting (yes/no)?

2修改要连接的linux服务器下的/etc/ssh/sshd_config目录
将PasswordAuthentication no改为PasswordAuthentication yes

然后运行 sudo /etc/init.d/ssh restart 就可以ssh远程连接该服务器了

原文链接:https://blog.csdn.net/zyf2333/article/details/80373502和http://blog.chinaunix.net/uid-26168435-id-5732463.html

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