Fify Wang

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Generate SSH key in none-interactive way

20 Jul 2016 » Linux

We use ssh-keygen to generate ssh keys. Sometime we need to generate keys without any interaction during runtime. We have the following ways to do this.

###1. Use the full commands Provide all parameters needed when running ssh-keygen, as

ssh-keygen -t rsa -N "" -f my.key

in which

  • -N "" tells it to use an empty passphrase (the same as two of the enters in an interactive script)
  • -f my.key tells it to store the key into my.key (change as you see fit).

###2. Provide “ENTER”s before running ssh-keygen

echo -e "\n\n\n" | ssh-keygen -t rsa

By using pipe, we actually enters 3 “ENTER”s while executing ssh-keygen, which uses the default values.