跳过SSH连接时的确认提示

平时在写一些脚本的时候, 需要频繁地连接在云上新创建的机器.
在ssh中第一次连接时, 会输出如下提示.

RSA key fingerprint is 96:a9:23:5c:cc:d1:0a:d4:70:22:93:e9:9e:1e:74:2f.
Are you sure you want to continue connecting (yes/no)? yes

这样会导致每次都需要输入yes来确认是否连接.
因为脚本不可以交互, 会导致脚本卡在这一步无法执行后续的操作.
因此需要跳过这一步的确认.

解决方案

在ssh连接时, 通过-o StrictHostKeyChecking=no参数来跳过确认.

ssh -o StrictHostKeyChecking=no -i <your-key> <username>@<hostname>

备注

在man ssh中对于StrictHostKeyChecking参数的描述如下:

The StrictHostKeyChecking option can be used to control logins to machines whose host key is not known or has changed.

参考

• how to avoid ssh asking permission?
• How to accept 'yes' from shell script "Are you sure you want to continue connecting (yes/no)?" using ssh. Without using StrictHostKeyChecking=no