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公開鍵を使ったSSH接続のやり方

Last updated at Posted at 2019-07-12

経緯

Ansibleを実行するためには、構築対象のマシンへ公開鍵でSSH接続する必要があるためと、 ssh-keygenとssh-copy-idコマンドを忘れそうだから備忘録を兼ねて。

鍵を作ろう

鍵はホスト側で作ります。
※お試しなんでkeyは空ですが、keyは設定するようにしましょう

command
$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):  #何も入れずにエンター
Enter passphrase (empty for no passphrase):               #何も入れずにエンター
Enter same passphrase again:                              #何も入れずにエンター
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx root@localhost.localdomain
The key's randomart image is:
+---[RSA 2048]----
+----[SHA256]-----+

ssh-copy-idを使って鍵を送り込もう

これもホスト側でやります

command
$ ssh-copy-id ${USER}@${ssh_target}
~~~省略~~~
Are you sure you want to continue connecting (yes/no)?     #yesを入力してエンター
~~~省略~~~
${USER}@${ssh_target}'s password:                          #接続先のパスワードを入力してエンター

これでパスワードなしでSSH接続ができるようになりました。

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