ssh自动登陆

devops 590 字 次

本文记录一些登陆的操作。

简化记录

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ssh-keygen -t rsa (一路回车)
ssh-copy-id latelee@172.18.18.18
存疑，测试发现需要使用：
ssh-copy-id -i ~/.ssh/id_rsa.pub latelee@172.18.18.18
也可手动将公钥文件的内容拷贝到~/.ssh/authorized_keys文件后面。

ssh密钥登陆Linux服务

环境：windows+git bash+mingw （注：本文命令适用于Windows和Linux系统）

服务器：Linux CentOS 7

打开git bash，产生密钥对： 

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ssh-keygen -t rsa -b 4096

出现输入项时，直接回车即可。

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Enter file in which to save the key (/c/Users/Late Lee/.ssh/id_rsa): // 回车
Enter passphrase (empty for no passphrase): // 回车
Enter same passphrase again: // 回车

最后输出目录：

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Your identification has been saved in /c/Users/Late Lee/.ssh/id_rsa.
Your public key has been saved in /c/Users/Late Lee/.ssh/id_rsa.pub.

产生文件：id_rsa为私钥，id_rsa.pub为公钥。

进入cd /c/Users/Late\ Lee/.ssh/目录。拷贝公钥到Linux服务器。 

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ssh-copy-id -i id_rsa.pub root@99.69.96.66

输出信息： 

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/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "id_rsa.pub"
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
root@99.69.96.66's password:  // !! 此处输入目标系统的密码

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'root@99.69.96.66'"
and check to make sure that only the key(s) you wanted were added.

输入 ssh root@99.69.96.66，可以不需要密码登陆。

也可以将公钥文件id_rsa.pub的内容放到远程服务器的~/.ssh/authorized_keys中（可以同时存在多个，按顺排好即可），示例：
echo "公钥内容" >> ~/.ssh/authorized_keys。

拷贝文件使用 scp 命令。在 Windows 系统可安装 cygwin 和 git 软件，以使用其提供的命令行。

附

Linux环境： 

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ssh-keygen -t rsa

其输出信息及操作（中文表示）如下： 

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Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): 保存目录，默认，直接回车即
Enter passphrase (empty for no passphrase): 不输入密码，直接回车即可
Enter same passphrase again: 直接回车
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:7PSMhZ5+ocFnRLSLDYrJFtCp2PfO5CNwQMYmnJHCqYo root@ecs-cba4-0002.novalocal
The key's randomart image is:
+---[RSA 2048]----+
|oo*. .   ..      |
|o*=.o     ..     |
|oB ..   ...      |
|o +..+ o =..     |
|o  o=...S.+      |
|E ... o+o*+      |
|   o =  ==o.     |
|    . =.. .      |
|     . ...       |
+----[SHA256]-----+