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@bigbridge(大橋 正明)

秘密鍵から公開鍵を導出する

Last updated at Posted at 2025-01-20

sh

ssh鍵を更新したあかつきにauthorized_keysファイルから旧公開鍵を削除したいんだが、ラベルがなくてどれやと途方に暮れたときに秘密鍵をソースにssh-keygen -yで公開鍵を導出できる

sh
# 秘密鍵の公開鍵をプリント
ssh-keygen \
-y \ # 公開鍵の抽出オプション
-f path/to/private_key # 秘密鍵の指定オプション

> ssh-rsa XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX...

# 上記の公開鍵を削除する
vi path/to/authorized_keys
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