Redmine起動時にPassengerで「Could not spawn process for application」エラー

2018/08/23

AWSで起動しているRedmineのEC2をt2.microからt2.smallに変えたところ、起動時にPassengerでエラーが発生して起動しなくなりました。

ログを見てみる

Passengerのログは設定してなかったので、apacheのerror_logに出てました。

/var/log/httpd/error_log

Could not spawn process for application /var/lib/redmine: An error occurred while starting up the preloader: it did not write a startup response in time. If your app needs more time to start you can increase the Passenger start timeout config option.
  Error ID: 354a019c
  Error details saved to: /tmp/passenger-error-IwDsAs.html
  Message from application: An error occurred while starting up the preloader: it did not write a startup response in time. If your app needs more time to start you can increase the Passenger start timeout config option. Please read <a href="https://github.com/phusion/passenger/wiki/Debugging-application-startup-problems">this article</a> for more information about this problem.

Could not spawn process for application /var/lib/redmine: An error occurred while starting up the preloader: it did not write a startup response in time. If your app needs more time to start you can increase the Passenger start timeout config option.

Error ID: 354a019c

Error details saved to: /tmp/passenger-error-IwDsAs.html

Message from application: An error occurred while starting up the preloader: it did not write a startup response in time. If your app needs more time to start you can increase the Passenger start timeout config option. Please read <a href="https://github.com/phusion/passenger/wiki/Debugging-application-startup-problems">this article</a> for more information about this problem.

「Passenger start timeout config option」とあるので、Passengerのタイムアウトを調べたところ、PassengerStartTimeoutというパラメータがありました。
PassengerStartTimeout

Specifies a timeout for the startup of application processes. If an application process fails to start within the timeout period then it will be forcefully killed with SIGKILL, and the error will be logged.

とりあえずこんなにいらないだろうけど、300秒にしました。
Passenger用のconfigファイルは作ってないので、Redmine用に作っている /etc/httpd/conf.d/redmine.conf に以下を追記しました。