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解决方法：
1、在ssh服务端上更改/etc/ssh/sshd_config文件中的配置为如下内容：- UseDNS no
- # GSSAPI options
- GSSAPIAuthentication no
2、如果还慢的话，检查ssh服务端上/etc/hosts文件中，127.0.0.1对应的主机名是否和 uname -n的结果一样，或者把本机ip和hostname(uname -n结果)加入到/etc/hosts里。- [root@C64 ~]# uname -n
- C64
- [root@C64 ~]# cat /etc/hosts
- #modi by oldboy 11:12 2013/9/24
- 127.0.0.1 C64 localhost localhost.localdomain localhost4 localhost4.localdomain4
- ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
- 10.0.0.18 C64
- ################
其实可以用下面的命令调试为什么慢的细节（学习这个思路很重要）。- [root@C64 ~]# ssh -v root@10.0.0.19
- OpenSSH_5.3p1, OpenSSL 1.0.0-fips 29 Mar 2010
- debug1: Reading configuration data /etc/ssh/ssh_config
- debug1: Applying options for *
- debug1: Connecting to 10.0.0.19 [10.0.0.19] port 22.
- debug1: Connection established.
- debug1: permanently_set_uid: 0/0
- debug1: identity file /root/.ssh/identity type -1
- debug1: identity file /root/.ssh/id_rsa type -1
- debug1: identity file /root/.ssh/id_dsa type -1
- debug1: Remote protocol version 2.0, remote software version OpenSSH_4.3
- debug1: match: OpenSSH_4.3 pat OpenSSH_4*
- debug1: Enabling compatibility mode for protocol 2.0
- debug1: Local version string SSH-2.0-OpenSSH_5.3
- debug1: SSH2_MSG_KEXINIT sent
- debug1: SSH2_MSG_KEXINIT received
- debug1: kex: server->client aes128-ctr hmac-md5 none
- debug1: kex: client->server aes128-ctr hmac-md5 none
- debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
- debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
- debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
- debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
- The authenticity of host '10.0.0.19 (10.0.0.19)' can't be established.
- RSA key fingerprint is ca:18:42:76:0e:5a:1c:7d:ef:fc:24:75:80:11:ad:f9.
- Are you sure you want to continue connecting (yes/no)? yes
- =======>老男孩老师评：这里就是提示保存密钥的交互提示。
- Warning: Permanently added '10.0.0.19' (RSA) to the list of known hosts.
- debug1: ssh_rsa_verify: signature correct
- debug1: SSH2_MSG_NEWKEYS sent
- debug1: expecting SSH2_MSG_NEWKEYS
- debug1: SSH2_MSG_NEWKEYS received
- debug1: SSH2_MSG_SERVICE_REQUEST sent
- debug1: SSH2_MSG_SERVICE_ACCEPT received
- debug1: Authentications that can continue: publickey,password
- debug1: Next authentication method: publickey
- debug1: Trying private key: /root/.ssh/identity
- debug1: Trying private key: /root/.ssh/id_rsa
- debug1: Trying private key: /root/.ssh/id_dsa
- debug1: Next authentication method: password
- root@10.0.0.19's password:
- =======>老男孩老师评：这里就是提示输入密码的交互提示。
- debug1: Authentication succeeded (password).
- debug1: channel 0: new [client-session]
- debug1: Entering interactive session.
- debug1: Sending environment.
- debug1: Sending env LANG = en_US.UTF-8
- Last login: Tue Sep 24 10:30:02 2013 from 10.0.0.18
- [root@C64_A ~]# ssh -v oldboy@10.0.0.17
- OpenSSH_5.3p1, OpenSSL 1.0.0-fips 29 Mar 2010
- debug1: Reading configuration data /etc/ssh/ssh_config
- debug1: Applying options for *
- debug1: Connecting to 10.0.0.17 [10.0.0.17] port 22.
- debug1: Connection established.
- debug1: permanently_set_uid: 0/0
- debug1: identity file /root/.ssh/identity type -1
- debug1: identity file /root/.ssh/id_rsa type -1
- debug1: identity file /root/.ssh/id_dsa type 2
- debug1: Remote protocol version 2.0, remote software version OpenSSH_5.3
- debug1: match: OpenSSH_5.3 pat OpenSSH*
- debug1: Enabling compatibility mode for protocol 2.0
- debug1: Local version string SSH-2.0-OpenSSH_5.3
- debug1: SSH2_MSG_KEXINIT sent
- debug1: SSH2_MSG_KEXINIT received
- debug1: kex: server->client aes128-ctr hmac-md5 none
- debug1: kex: client->server aes128-ctr hmac-md5 none
- debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
- debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
- debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
- debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
- debug1: Host '10.0.0.17' is known and matches the RSA host key.
- debug1: Found key in /root/.ssh/known_hosts:2
- debug1: ssh_rsa_verify: signature correct
- debug1: SSH2_MSG_NEWKEYS sent
- debug1: expecting SSH2_MSG_NEWKEYS
- debug1: SSH2_MSG_NEWKEYS received
- debug1: SSH2_MSG_SERVICE_REQUEST sent
- debug1: SSH2_MSG_SERVICE_ACCEPT received
- debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
- debug1: Next authentication method: gssapi-keyex
- debug1: No valid Key exchange context
- debug1: Next authentication method: gssapi-with-mic
实际上在linux系统优化部分就应该优化SSH服务的此处。 |
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