What should I do if I cannot log in despite my correct password in centos7?

In the startup grub interface, press the up and down keys to select the Linux normal system, press the e key to enter the code editing interface;

Edit the linux16 line and change ro to rw init=/sysroot/bin/sh;

(Recommended tutorial: centos tutorial)

Temporarily change the startup code, boot without mounting the disk, and enter the shell directly: sh ;

Press the ctrl Find the relevant error message:

chroot /sysroot       #切换根目录

Open the file and remove the problematic module

vi /var/log/secure   #查看日志文件

Comment out the problematic module:

Jan  18 12:10:17 sguap0010 login: PAM adding faulty module: /lib/security/pam_limits.so
Jan  18 12:10:20 sguap0010 login: pam_unix(login:session): session opened for user root by LOGIN (uid=0)
Jan  18 12:10:21 sguap0010 login: Module is unknown

or

vi /etc/pam.d/login

exit --- Exit bash and return to sh

reboot --- Restart

After entering the system, download the pam_limits.so module file and overwrite /lib/security/pam_limits.so

(64-bit operating system, overwrite /lib64/security/pam_limits.so)

Then

#session required /lib/security/pam_limits.so

uncomment what you just commented out

#session include system-auth

or

vi /etc/pam.d/login

That’s it.

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