jenkins 执行 ssh 命令报错Permission denied (publickey).

发表于

WHAT

jenkins执行带有ssh命令的任务，报错“Permission denied (publickey).”；

WHY

手动迁移几个jenkins任务，结果有几个任务命令中带ssh，一直报错；

HOW

现象

  • 两个不同环境的服务器小A和小B，都启动了jenkins服务，上面有一个同样的任务是“ssh登录到服务器小C上执行一个命令”；
  • 原本在小A的jenkins上的任务可以正常执行；
  • 但是小B上的任务一直报Permission denied (publickey).；
  • 确认了下小A和小B的~/.ssh/id_rsa.pub都是一样的；
  • 同时在小B服务器上直接ssh root@小C "echo 'hello world'"也是ok的
  • google关键字“jenkins ssh Permission denied (publickey).”找到了这个问题中的这句话“I would suggest to use the -v argument to compare the 2 outputs:

”

  • 于是将原本的命令ssh root@小C "echo 'hello world'"改成ssh -v root@小C "echo 'hello world'，将ssh的详细信息打印出来

  • 最后几行输出为

    1
    2
    3
    4
    5
    6
    7
    debug1: Next authentication method: publickey
    debug1: Trying private key: /var/lib/jenkins/.ssh/id_rsa
    debug1: Trying private key: /var/lib/jenkins/.ssh/id_dsa
    debug1: Trying private key: /var/lib/jenkins/.ssh/id_ecdsa
    debug1: Trying private key: /var/lib/jenkins/.ssh/id_ed25519
    debug1: No more authentication methods to try.
    Permission denied (publickey).

  • 找到了最关键的目录/var/lib/jenkins/.ssh/

  • 于是进去看了一眼，发现小A的目录下安安静静的躺着三个文件“authorized_keys id_rsa id_rsa.pub”
  • 而小B的目录下空空如也
  • 于是把小B的~/.ssh/复制到/var/lib/jenkins/.ssh/下
  • 果然，jenkins任务成功执行了

至此，大功告成

END

未完待续……