Shulou(Shulou.com)06/03 Report--

How to solve the problem that ssh is unable to log in and local remotely? I believe that many inexperienced people are at a loss about this. This article summarizes the solutions to the inability to connect to ssh. Through this article, I hope you can solve this problem.

Problem: ssh cannot log in remotely or locally, prompting you to report an error permission denied

Advanced single-user mode center os7 entry single user is in the startup item, press E to edit, join init=/bin/sh, press ctrl+x to enter

The default login single user is read only. The root partition mount-o remount,rw / needs to be remounted.

Check the log / var/log/secure for the following error

The keyword nofile is very important. Check the parameter setting of nofile.

Vi / etc/security/limits.conf

* soft nofile 102400

* hard nofile 102400

* soft nofile 102400

* hard nofile 102400

Then check the nr_open.

Cat / proc/sys/fs/nr_open

100000

This value is less than hard nofile and cannot be set like this normally. Check vi / etc/sysctl.conf.

Modify fs.nr_open greater than or equal to OK after hard nofile restart (you can also sysctl-w fs.nr_open=100000000)

PS: single user mode enter exec / sbin/init to exit single user mode

Problem solving: sysctl sets hard nofile with fs.nr_open greater than or equal to / etc/security/limits.conf

The solution described above is that ssh can not be connected, and the specific usage needs to be used by everyone through hands-on experiments. If you want to know more about it, welcome to follow the industry information channel!

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