从 2.9.0.beta8 升级导致网站崩溃，无法恢复

[Benjamin_D (Benjamin Decotte)]

@pfaffman

/var/discourse/shared/log/rails/production.log

（如果我在手机上输入正确的话）

差不多
/var/discourse/shared/standalone/log/rails/production.log
还有可能
/var/discourse/shared/standalone/log/rails/production_errors.log