"An error occurred authenticating. Please try again later." " not able to authenticate with any project"
版本 Juno， ubuntu 14.04
查看/var/log/keystone/keystone-all.log
发现报错 Too many connections
打开/etc/mysql/my.cnf
文件里注释掉了这一行，或者太小，可以改大一些，恢复正常
max_connection = 100