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RHEL 7 の systemd で root のパスワードをリセットする

Solution Verified - Updated 2017-05-31T01:43:55+00:00 -

Issue

RHEL 7 の systemd で root のパスワードをリセットするにはどうすれば良いですか?
RHEL 7 で、シングルユーザーモードでシステムを起動したあとにも root パスワードを聞かれます。
シングルユーザーモードで root パスワードを変更することができません。

Environment

Red Hat Enterprise Linux 7.

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