Linux登录失败：Too many logins for 'username'.

cat /etc/security/limits.conf

#<domain>      <type>  <item>         <value>
*                -       maxlogins       8

用命令last | grep username | grep logged查看已连接数，发现已达到最大值

修改limits.conf中maxlogins值，然后重新登录就好啦