ssh 免密登录失效

问题描述：

• 在Linux上新建了一个用户 useradd -aG wheel someone
• 在 /home/someone 中新建 .ssh/authorized_keys ‘
• 将本地 id_rsa.pub 文件copy到远程主机；看着这个log就有种不祥的预感

  / # ssh-copy-id jduc@101.124.7.232
  /usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/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
  expr: warning: '^ERROR: ': using '^' as the first character
  of a basic regular expression is not portable; it is ignored
  /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
  jduc@101.124.7.232's password:
  

• ssh 登录； 果然，ops

  λ ssh someone@x.x.x.x
  someone@x.x.x.x's password:
  

解法

• 当然是Google喽， 原因是权限问题： .ssh 文件的权限需要时700， authorized_keys 权限是 600

  chmod 700 ~/.ssh
  chmod 600 ~/.ssh/authorized_keys
  

• 本地ssh 重新登录； perfect~

  λ ssh someone@x.x.x.x
  Last login: Mon Jul  2 14:16:46 2018 from 111.200.23.14
  Welcome to xxx Service
  [someone@FrontendProd ~]$
  

next

• 为什么是权限问题？