CentOS 7的默认根密码是什么

CentOS 7没有默认的root密码，安装时需手动设置，否则root账户保持锁定状态；实际使用中，用户应通过sudo执行管理员任务，若已设置root密码则可直接登录或切换，未设置时需用sudo权限用户执行sudo passwd root来设置；总结：1. CentOS 7无默认root密码；2. root账户默认锁定；3. 推荐使用sudo进行管理操作；4. 可通过sudo passwd root手动设置root密码，因此无法直接登录root时应检查是否已完成密码设置或使用sudo用户获取权限，该设计旨在提升系统安全性。

CentOS 7 does not have a default root password set during installation.

When you install CentOS 7, the system prompts you to create a regular user account and set a password for that user. During this process, you are also asked to set a root password — but this is done manually, not automatically. If you skip setting a root password during installation, the root account remains locked by default, and direct login as root (especially via SSH) is disabled for security reasons.

What this means in practice:

• No default password: There is no universal or factory-set root password for CentOS 7.

  

• Root access via sudo: If you have a user account in the wheel group (the default admin group), you can gain root privileges using sudo.

  sudo -i

  or

  

  sudo su -

  You’ll be prompted for your own user password, not the root password.

• If you set a root password during install: Then you can use it to log in directly as root or switch to root using su -.

• If you never set one: The root account is locked, and you cannot log in as root until a password is assigned (by a user with sudo privileges).

How to set or reset the root password

If you have sudo access:

sudo passwd root

This command allows you to set a new password for the root account.

Summary

• ✅ No default root password in CentOS 7
• ✅ Root is locked unless explicitly enabled
• ✅ Use sudo with your user account for administrative tasks
• ✅ Set root password manually if needed using sudo passwd root

So, if you're setting up a new CentOS 7 system and can't log in as root, make sure you either set the root password during installation or use a sudo-enabled user to gain administrative access.

Basically, it's designed this way for security — you need to intentionally enable direct root access.

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