Ruby applications are not working when CageFS is used.

Symptoms

• Ruby applications on a CloudLinux server are not working.

• Affected websites have CageFS activated.

• Either /var/log/httpd/error.log or /var/log/nginx/error.log contains entries alike:

  CONFIG_TEXT: App 1617473 output: Warning: cannot open /tmp/passenger.spawn.XXXXYWIy0c/envdump/user_info for writing
  App 1617473 output: Warning: cannot open /tmp/passenger.spawn.XXXXYWIy0c/envdump/envvars for writing
  App 1617473 output: Warning: cannot open /tmp/passenger.spawn.XXXXYWIy0c/envdump/user_info for writing
  App 1617473 output: Warning: cannot open /tmp/passenger.spawn.XXXXYWIy0c/envdump/envvars for writing
  App 1617473 output: Warning: Cannot create file /tmp/passenger.spawn.XXXXYWIy0c/response/steps/subprocess_spawn_env_setupper_before_shell/state: No such file or directory (errno=2)

Cause

Currently, Plesk Onyx does not support Ruby applications when CageFS is enabled and used.

Resolution

There are two available workarounds:

• Do not use CageFS for Ruby applications. In order to turn off CageFS for the particular domain user go to Plesk > Extensions > CageFS

• Customize CageFS according to CloudLinux documentation: CageFS.

  Note: for more information about customizing CageFS, contact CloudLinux Technical Support: https://www.cloudlinux.com/support

Additional information

Refer to the following article in order to learn more about Ruby applications in Plesk: Ruby Support (Linux)