su切换用户提示资源不足

centos下切换用户提示

su: cannot set user id: Resource temporarily unavailable

尝试使用ssh登陆

ssh [email protected]
Connection to xx.xx.xx.xx closed by remote host.
Connection to xx.xx.xx.xx closed.

检查资源限制

/etc/security/limits.conf

检查程序消耗

检查连接数