linux下SSH远程连接服务慢解决方案

1、适用命令及方案如下：
【远程连接及执行命令】
ssh -p22 root@10.0.0.19
ssh -p22 root@10.0.0.19 /sbin/ifconfig
【远程拷贝：推送及拉取】
scp -P22 -r -p /etc root@10.0.0.19:/tmp/
scp -P22 -r -p root@10.0.0.19:/tmp/ /etc
【安全的FTP功能】
sftp -oPort=22 root@10.0.0.19
【无密码验证方案】
例如利用sshkey批量分发文件，执行部署操作。

2、连接慢的主要原因是DNS解析导致
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
然后，执行/etc/init.d/sshd restart重启sshd进程使上述配置生效，在连接一般就不慢了。

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

								################

3、利用ssh-v的调试功能查找慢的原因
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

								在远程连接时如果慢就可以确定卡在哪了。

								[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

上述配置没配就发现卡到gssapi这。就大概知道是gssapi的问题。
实际上在linux系统优化部分就应该优化SSH服务的此处。

本文出自 “老男孩linux运维” 博客，请务必保留此出处http://oldboy.blog.51cto.com/2561410/1300964

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linux下SSH远程连接服务慢解决方案