Does anyone know how to enable debug mode during starting Centos 7 or Centos 6.5? I mean when any login issue comes for start Centos and we need to doing troubleshoot for the reason.
Appreciate much for any adivce.
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for CentOS 7 you can use journald to get error messages during startup, messages will get removed after server reboot, if you want to keep them or have a easy access create the following folder
sudo mkdir /var/log/journal sudo systemd-tmpfiles --create --prefix /var/log/journal sudo systemctl restart systemd-journald