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http://blog.csdn.net/john_f_lau/article/details/22303341
http://blog.chinaunix.net/uid-26284395-id-2949145.html
ssh-copy-id命令可以把本地的ssh公钥文件安装到远程主机对应的账户下。 达到的功能： ssh-copy-id - 将你的公共密钥填充到一个远程机器上的authorized_keys文件中。 使用模式： ssh-copy-id [-i [identity_file]] [user@]machine 描述： ssh-copy-id 是一个实用ssh去登陆到远程服务器的脚本（假设使用一个登陆密码， 因此，密码认证应该被激活直到你已经清理了做了多个身份的使用）。 它也能够改变远程用户名的权限，~/.ssh和~/.ssh/authorized_keys 删除群组写的权限（在其它方面，如果远程机上的sshd在它的配置 文件中是严格模式的话，这能够阻止你登陆。）。 如果这个 “-i”选项已经给出了，然后这个认证文件（默认是~/.ssh /id_rsa.pub）被使用，不管在你的ssh-agent那里是否有任何密钥。 另外，命令 “ssh-add -L” 提供任何输出，它使用这个输出优先于 身份认证文件。如果给出了参数“-i”选项，或者ssh-add不产生输出， 然后它使用身份认证文件的内容。一旦它有一个或者多个指纹，它使 用ssh将这些指纹填充到远程机~/.ssh/authorized_keys文件中。 ssh-keygen 产生公钥与私钥对. ssh-copy-id 将本机的公钥复制到远程机器的authorized_keys文件中，ssh-copy-id也能让你有到远程机器的home, ~./ssh , 和 ~/.ssh/authorized_keys的权利 第一步:在本地机器上使用ssh-keygen产生公钥私钥对 jsmith@local-host$ [Note: You are on local-host here] jsmith@local-host$ ssh-keygen Generating public/private rsa key pair. Enter file in which to save the key (/home/jsmith/.ssh/id_rsa):[Enter key] Enter passphrase (empty for no passphrase): [Press enter key] Enter same passphrase again: [Pess enter key] Your identification has been saved in /home/jsmith/.ssh/id_rsa. Your public key has been saved in /home/jsmith/.ssh/id_rsa.pub. The key fingerprint is: 33:b3:fe:af:95:95:18:11:31:d5:de:96:2f:f2:35:f9 jsmith@local-host 第二步:用ssh-copy-id将公钥复制到远程机器中 jsmith@local-host$ ssh-copy-id -i ~/.ssh/id_rsa.pub remote-host jsmith@remote-host's password: Now try logging into the machine, with "ssh 'remote-host'", and check in: .ssh/authorized_keys to make sure we haven't added extra keys that you weren't expecting. 注意: ssh-copy-id 将key写到远程机器的 ~/ .ssh/authorized_key.文件中 第三步: 登录到 远程机器不用输入密码 jsmith@local-host$ ssh remote-host Last login: Sun Nov 16 17:22:33 2008 from 192.168.1.2 [Note: SSH did not ask for password.] jsmith@remote-host$ [Note: You are on remote-host here]
常见问题： ssh-copy-id -u eucalyptus -i ~eucalyptus/.ssh/id_rsa.pub eucalyptus@remote_host上述是给eucalyptus用户赋予无密码登陆的权利 [1] /usr/bin/ssh-copy-id: ERROR: No identities found使用选项 -i ，当没有值传递的时候或者 如果 ~/.ssh/identity.pub 文件不可访问（不存在）, ssh-copy-id 将显示上述的错误信息 （ -i选项会优先使用将ssh-add -L的内容） jsmith@local-host$ ssh-agent $SHELL jsmith@local-host$ ssh-add -L The agent has no identities. jsmith@local-host$ ssh-add Identity added: /home/jsmith/.ssh/id_rsa (/home/jsmith/.ssh/id_rsa) jsmith@local-host$ ssh-add -L ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAsJIEILxftj8aSxMa3d8t6JvM79DyBV aHrtPhTYpq7kIEMUNzApnyxsHpH1tQ/Ow== /home/jsmith/.ssh/id_rsa jsmith@local-host$ ssh-copy-id -i remote-host jsmith@remote-host's password: Now try logging into the machine, with "ssh 'remote-host'", and check in: .ssh/authorized_keys to make sure we haven't added extra keys that you weren't expecting. [Note: This has added the key displayed by ssh-add -L] [2] ssh-copy-id应注意的三个小地方 Default public key: ssh-copy-id uses ~/.ssh/identity.pub as the default public key file (i.e when no value is passed to option -i). Instead, I wish it uses id_dsa.pub, or id_rsa.pub, or identity.pub as default keys. i.e If any one of them exist, it should copy that to the remote-host. If two or three of them exist, it should copy identity.pub as default. The agent has no identities: When the ssh-agent is running and the ssh-add -L returns “The agent has no identities” (i.e no keys are added to the ssh-agent), the ssh-copy-id will still copy the message “The agent has no identities” to the remote-host’s authorized_keys entry. Duplicate entry in authorized_keys: I wish ssh-copy-id validates duplicate entry on the remote-host’s authorized_keys. If you execute ssh-copy-id multiple times on the local-host, it will keep appending the same key on the remote-host’s authorized_keys file without checking for duplicates. Even with duplicate entries everything works as expected. But, I would like to have my authorized_keys file clutter free. |
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