Shulou(Shulou.com)06/02 Report--

1. Modify / etc/sudoers, find the following line, and add an ordinary user, such as user abc, under root (provided that the abc user already exists and the password is set):

Allow root to run any commands anywhere

Root ALL= (ALL) ALL

Abc ALL= (ALL) ALL

2. It means that the user is allowed to be given the same permission as root to execute any command anywhere.

3. Edit the configuration file of ssh, find the following line, change yes to no, and prohibit root users from logging in:

Vi / etc/ssh/sshd_config

# PermitRootLogin yes

PermitRootLogin no

4. After the above simple configuration, you can disable root login. After logging in to the machine with ordinary user abc, if you want to switch to root, then use the su command to switch to root:

Su root

Then enter the corresponding password according to the prompt

5. It is recommended to disable root login in ssh to avoid being cracked; in addition, modify the default port 22 of ssh, or add ssh whitelist to protect the server.

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