设置ssh自动登录远程主机的配置要点

作者: 日期: 2012/06/16

本地生成的的RSA密钥传需要传到远程主机相应用户家目录下的.ssh子目录下，注意该子目录的权限设置是有严格要求的：其所属用户当然是该用户，其权限应该是700, 即不允许其它用户进入并访问该目录；否则，无法自动登录的。

这种情况下，使用ssh 的-v参数显示详细消息大致如下：

$ ssh -v feng@myremote.host.net
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 myremote.host.net [50.116.14.251] port 22.
debug1: Connection established.
debug1: identity file /home/feng/.ssh/identity type -1
debug1: identity file /home/feng/.ssh/id_rsa type 1
debug1: identity file /home/feng/.ssh/id_dsa type -1
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 'myremote.host.net' is known and matches the RSA host key.
debug1: Found key in /home/feng/.ssh/known_hosts:8
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
debug1: Unspecified GSS failure.  Minor code may provide more information
Credentials cache file '/tmp/krb5cc_501' not found

debug1: Unspecified GSS failure.  Minor code may provide more information
Credentials cache file '/tmp/krb5cc_501' not found

debug1: Unspecified GSS failure.  Minor code may provide more information

debug1: Unspecified GSS failure.  Minor code may provide more information

debug1: Next authentication method: publickey
debug1: Offering public key: /home/feng/.ssh/id_rsa
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Offering public key: .ssh/id_rsa
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Trying private key: /home/feng/.ssh/identity
debug1: Trying private key: /home/feng/.ssh/id_dsa
debug1: Next authentication method: password
feng@myremote.host.net's password:

了解关于ssh免密码登录，强烈推荐这篇文章，基于ssh密钥对的自动登录原理及实际操作

另请参看 ssh无密码登入设置(完全版)/linux下免输入密码ssh登录




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