转 SSH 远程连接服务慢的解决方案

Posted on 2016/10/04 by 王 淑娟

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： 

    

  1. UseDNS no
    2. 

  2. # GSSAPI options
    3. 

  3. GSSAPIAuthentication no
    4.

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。 baskets new balance pas cher nike air max 2016 hombre 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。 louboutin flat sandals Nike Air Jordan Baratas 

    

  1. [root@C64 ~]# uname -n
    2. 

  2. C64
    3. 

  3. [root@C64 ~]# cat /etc/hosts
    4. 

  4. #modi by oldboy 11:12 2013/9/24
    5. 

  5. 127.0.0.1 C64 localhost localhost.localdomain localhost4 localhost4.localdomain4
    6. 

  6. ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
    7. 

  7. 10.0.0.18 C64
    8. 

  8. ################
    9.


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）。 Nike Air Presto femme asics adidasi de sala 

    

  1. [root@C64 ~]# ssh -v root@10.0.0.19
    2. 

  2. OpenSSH_5.3p1, OpenSSL 1.0.0-fips 29 Mar 2010
    3. 

  3. debug1: Reading configuration data /etc/ssh/ssh_config
    4. 

  4. debug1: Applying options for *
    5. 

  5. debug1: Connecting to 10.0.0.19 [10.0.0.19] port 22.
    6. 

  6. debug1: Connection established.
    7. 

  7. debug1: permanently_set_uid: 0/0
    8. 

  8. debug1: identity file /root/.ssh/identity type -1
    9. 

  9. debug1: identity file /root/.ssh/id_rsa type -1
    10. 

  10. debug1: identity file /root/.ssh/id_dsa type -1
    11. 

  11. debug1: Remote protocol version 2.0, remote software version OpenSSH_4.3
    12. 

  12. debug1: match: OpenSSH_4.3 pat OpenSSH_4*
    13. 

  13. debug1: Enabling compatibility mode for protocol 2.0
    14. 

  14. debug1: Local version string SSH-2.0-OpenSSH_5.3
    15. 

  15. debug1: SSH2_MSG_KEXINIT sent
    16. 

  16. debug1: SSH2_MSG_KEXINIT received
    17. 

  17. debug1: kex: server->client aes128-ctr hmac-md5 none
    18. 

  18. debug1: kex: client->server aes128-ctr hmac-md5 none
    19. 

  19. debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
    20. 

  20. debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
    21. 

  21. debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
    22. 

  22. debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
    23. 

  23. The authenticity of host '10.0.0.19 (10.0.0.19)' can't be established.
    24. 

  24. RSA key fingerprint is ca:18:42:76:0e:5a:1c:7d:ef:fc:24:75:80:11:ad:f9.
    25. 

  25. Are you sure you want to continue connecting (yes/no)? yes
    26. 

  26. =======>老男孩老师评：这里就是提示保存密钥的交互提示。 nike pas cher  nike air max 2017 femme rouge 
    27. 

  27. Warning: Permanently added '10.0.0.19' (RSA) to the list of known hosts.
    28. 

  28. debug1: ssh_rsa_verify: signature correct
    29. 

  29. debug1: SSH2_MSG_NEWKEYS sent
    30. 

  30. debug1: expecting SSH2_MSG_NEWKEYS
    31. 

  31. debug1: SSH2_MSG_NEWKEYS received
    32. 

  32. debug1: SSH2_MSG_SERVICE_REQUEST sent
    33. 

  33. debug1: SSH2_MSG_SERVICE_ACCEPT received
    34. 

  34. debug1: Authentications that can continue: publickey,password
    35. 

  35. debug1: Next authentication method: publickey
    36. 

  36. debug1: Trying private key: /root/.ssh/identity
    37. 

  37. debug1: Trying private key: /root/.ssh/id_rsa
    38. 

  38. debug1: Trying private key: /root/.ssh/id_dsa
    39. 

  39. debug1: Next authentication method: password
    40. 

  40. root@10.0.0.19's password:
    41. 

  41. =======>老男孩老师评：这里就是提示输入密码的交互提示。 Nike Air Max Thea Femme Rose

  42. Air Max 2017 Nero Donna
    43. 

 

  43. debug1: Authentication succeeded (password).
    44. 

  44. debug1: channel 0: new [client-session]
    45. 

  45. debug1: Entering interactive session.
    46. 

  46. debug1: Sending environment.
    47. 

  47. debug1: Sending env LANG = en_US.UTF-8
    48. 

  48. Last login: Tue Sep 24 10:30:02 2013 from 10.0.0.18 
    49.

在远程连接时如果慢就可以确定卡在哪了。 Adidas Superstar Femme Noire Wisconsin Badgers 

    

  1. [root@C64_A ~]# ssh -v oldboy@10.0.0.17
    2. 

  2. OpenSSH_5.3p1, OpenSSL 1.0.0-fips 29 Mar 2010
    3. 

  3. debug1: Reading configuration data /etc/ssh/ssh_config
    4. 

  4. debug1: Applying options for *
    5. 

  5. debug1: Connecting to 10.0.0.17 [10.0.0.17] port 22.
    6. 

  6. debug1: Connection established.
    7. 

  7. debug1: permanently_set_uid: 0/0
    8. 

  8. debug1: identity file /root/.ssh/identity type -1
    9. 

  9. debug1: identity file /root/.ssh/id_rsa type -1
    10. 

  10. debug1: identity file /root/.ssh/id_dsa type 2
    11. 

  11. debug1: Remote protocol version 2.0, remote software version OpenSSH_5.3
    12. 

  12. debug1: match: OpenSSH_5.3 pat OpenSSH*
    13. 

  13. debug1: Enabling compatibility mode for protocol 2.0
    14. 

  14. debug1: Local version string SSH-2.0-OpenSSH_5.3
    15. 

  15. debug1: SSH2_MSG_KEXINIT sent
    16. 

  16. debug1: SSH2_MSG_KEXINIT received
    17. 

  17. debug1: kex: server->client aes128-ctr hmac-md5 none
    18. 

  18. debug1: kex: client->server aes128-ctr hmac-md5 none
    19. 

  19. debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
    20. 

  20. debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
    21. 

  21. debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
    22. 

  22. debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
    23. 

  23. debug1: Host '10.0.0.17' is known and matches the RSA host key.
    24. 

  24. debug1: Found key in /root/.ssh/known_hosts:2
    25. 

  25. debug1: ssh_rsa_verify: signature correct
    26. 

  26. debug1: SSH2_MSG_NEWKEYS sent
    27. 

  27. debug1: expecting SSH2_MSG_NEWKEYS
    28. 

  28. debug1: SSH2_MSG_NEWKEYS received
    29. 

  29. debug1: SSH2_MSG_SERVICE_REQUEST sent
    30. 

  30. debug1: SSH2_MSG_SERVICE_ACCEPT received
    31. 

  31. debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
    32. 

  32. debug1: Next authentication method: gssapi-keyex
    33. 

  33. debug1: No valid Key exchange context
    34. 

  34. debug1: Next authentication method: gssapi-with-mic
    35.

上述配置没配就发现卡到gssapi这。 adidas nmd enfants adidas superstar dziecięce 就大概知道是gssapi的问题。 nike air max 1 print donna air max 2017 heren 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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