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Syed
Community Manager
Community Manager
  • 2,403 Views

Take the latest RHEL Troubleshooting Challenge and let us know if you were able to fix the problem

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200K Contest Question # 1: 

  1. Take the latest RHEL Troubleshooting Challenge and let us know if you were able to fix the problem - https://play.instruqt.com/rhel/invite/vj8hdenefrfu
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Scott
Starfighter Starfighter
Starfighter
  • 763 Views

So I've seen a few comments in the post-activity ratings that indicate people need to 'reboot' to fix the problem.  That's not how I would recommend 'fixing' it.  It also means you took an unscheduled downtime on your system that you could have resolved without rebooting.

--
Manager, Technical Marketing
Red Hat Enterprise Linux
Red Hat Certified Engineer (100-000-264)

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42 Replies
Chetan_Tiwary_
Moderator
Moderator
  • 1,164 Views

Wonderful challenge ! Really enjoyed

Screenshot from 2024-06-11 01-01-45.png

0 Kudos
Prismo
Cadet
Cadet
  • 1,145 Views

Thanks for putting this together!

Prismo_0-1718054954610.png

 

ipalagin
Flight Engineer Flight Engineer
Flight Engineer
  • 1,106 Views

Too easy!

Do you accept ideas for the challenges?  I think I can recall some real life issues from my experience.

 

Thanks!

Scott
Starfighter Starfighter
Starfighter
  • 711 Views

I would love to hear suggestions!  I can't promise that we can implement them, but would be really interested in more real-life problems that we can diagnose and resolve.

-Scott

Scott McBrien
Manager, Technical Marketing
Red Hat Enterprise Linux
RHCE (100-000-264)

--
Manager, Technical Marketing
Red Hat Enterprise Linux
Red Hat Certified Engineer (100-000-264)
ipalagin
Flight Engineer Flight Engineer
Flight Engineer
  • 175 Views

The ones I can recall right now:

Rotating log files without restarting the service.  File is deleted while still being open by Apache or Tomcat, "du" shows 10% /var/log filesystem usage, while "df" says the usage is 100%.

Mounting NFS for temporary usage and forgetting to unmount.  The NFS server gets rebooted at some point, so the NFS mount hangs. Admin scripts which depend on the storage (like checking free space) begin to hang as well, so their functions like cleaning directories and log rotation gets paused too.  And if someone forcefully unmounts the bad NFS mount during business hours, show begins: released from the hanging state, log rotation scripts start to do their job at 1pm instead of 1am

Security improvements is a special topic. For example, specifying a group name with allowed SSH login in sshd_conf.  Non-members of this group can't log in via SSH anymore, and this cause isn't easy to find.

Using immutable flag and ACLs with files may be impressive for those who don't use them - and most ones don't.

Backup files in the drop-in config directories, like /etc/sudoers.d !  Sysadmins forget than both old and new versions are active, so they overlap and create unexpected effects.

 

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Kevol
Mission Specialist
Mission Specialist
  • 1,088 Views

Nice challengeCapture.PNG

Kevol
Mission Specialist
Mission Specialist
  • 1,088 Views

Capture.PNG

Abdellatif
Mission Specialist
Mission Specialist
  • 1,042 Views

Hello done

Abdellatif_0-1718097486383.png

 

Chetan_Tiwary_
Moderator
Moderator
  • 954 Views

@Abdellatif It should show the completed (check mark sign ) like others have shared. Please check once if it is showing completed.

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