ssh免密码登录和传输

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Why

玩linux的，都会遇到需要操作一大堆serve时，要切换不同身份，端口和密码去分别登录，烦人的很，其实ssh提供了一种基于非对称加密的方法实现免密码登录

How

假定需要从A传输文件或登录到B，执行以下步骤

Step 1

在A机器上生成的ssh public-private keys，如果已经生成过了，可忽略这一步

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ssh-keygen -t rsa

就会在~/.ssh/目录下生成一个id_rsa (private key) and id_ras.pub (public key)

Step 2

在A机器上配置~/.ssh/config文件,add below content

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Host fire
    HostName 115.159.114.116
    Port 22
    User ubuntu
    IdentityFile ~/.ssh/id_rsa

Note:

  • ‘Port’ field default to 22,
  • ‘User’ default to the current account name on machine A
  • ‘IdentityFile’ is the private key you want to user on machine A, aka the private key file you generated in step 1

Please modify them if necessary

Step 3

在机器B上，添加机器A的public key的完成内容到 ~/.ssh/authorized_keys，create the file if not not exist
可以添加多个哦

添加完成后，就可以在A上免密ssh到B了

ssh fire
scp ./xxx fire:~/

Reference

Simplify Your Life With an SSH Config File