Redmine is popular open source project management tool used as project monitoring and tracking tool. After recent update of bundler, redmine was not starting. We are using Redmine on Ubuntu from past one month without any issue, suddenly it was not starting. When we checked production log file under ‘ /var/log/redmine/default/'

We could see following error –

[ 2016-02-24 08:25:17.8434 6628/7efdf3c1e700 age/Cor/App/Implementation.cpp:304 ]: Could not spawn process for application /usr/share/redmine: An error occurred while starting up the preloader: it did not write a startup response in time.

Message from application: Bundler could not find compatible versions for gem "bundler":

In Gemfile:

rails (~> 4.2.8) was resolved to 4.2.10, which depends on

bundler (< 2.0, >= 1.3.0)

Current Bundler version:

bundler (2.0.1)

This Gemfile requires a different version of Bundler.

Perhaps you need to update Bundler by running `gem install bundler`?

We have tried to update Bundler as per suggestion but no luck getting same error. So actual issue was with passenger.

To debug this issue we have started Redmine without passenger, navigate to redmine install folder/directory and execute following command.

$rails server webrick -e production

or

$rails server webrick -p 3001 -e production 

And it worked.

Following is Redmine environment

[redmine]$ sudo ruby bin/about 
sh: 1: darcs: not found 
sh: 1: hg: not found 
sh: 1: bzr: not found 
Environment: Redmine version                3.4.4.stable 
Ruby version                   2.5.1-p57 (2018-03-29) [x86_64-linux-gnu] 
Rails version                  4.2.10 
Environment                    production 
Database adapter               Mysql2 
SCM: 
Subversion                     1.9.7 
Cvs                            1.12.13 
Git                            2.17.1 Filesystem                      
Redmine plugins: 
no plugin installed

Happy bugging.

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