In-Depth Followup to the cPanel/WHM Admin Essentials 30-Minute Webinar

server load troubleshoot using sysstat

If it's allright with you, I'll break this out into it's own thread and respond to this in a day or so; it's a pretty in-depth question (and a good one). Thanks!

 

Os

The best OS for you to use is the one you are most comfortable with. If you're very familiar with FreeBSD, then by all means use that. If you're more familiar with Linux, then it's probably your best choice. With that said, Linux (CentOS/RedHat) seems to be the most popular platform with cPanel/WHM, so that may factor into your decision (the more people that run software with a particular configuration, the larger your peer support pool).

 

How can we limit PHP Memory usage. Some scripts create a loop and eat up servers memory which causes swap and eventually high server load.

 

I've had some in-depth discussions this week about using cloudlinux (cloudlinux.com) to limit resources on a per account basis (almost like a VPS but at a cPanel account level). Is this recommended or do you have any views on it?

Specifically this would be to stop one users processes overloading the system?

 

Regarding a high WA, would spread accounts on additional disk reduce the server load?

 

CPanel users

Is there a way to create a limited CPanel user, with access only to email and ftp accounts but not to databases and content?

 

I would suggest checking this on WHM:
Main >> Service Configuration >> PHP Configuration Editor
- max_execution_time and memory_limit

 

IO Wait issues with user backups while WHM is running nightly backup

In the webinar you mentioned I/O waits are one of the bigger issues in performance, and that's in the neighborhood of my question / concern.

I have disabled (hidden) the Backup and Backup Wizard icons in all customer cPanels because of the fact that I have WHM set to run a nightly backup (to secondary hard drive in each server), and I'm concerned about users deciding to run their own Backup from cPanel at the same time that WHM nightly backups are already running from main disk to second disk.

Obviously the nightly backup puts forth I/O load spike during that time all by itself, so the main question for me is:

How safe is it to re-enable the Backup icons in cPanel for my customers, knowing that some of them with large accounts will tend to run their own Backup from cPanel at the same time while WHM is running it's nightly backups of their account at the same time?

My secondary question to that would be; if I do enable to Backup icons and a large account user decides to run a full backup of their account while WHM is already in the process of backing up their account to the second drive, does WHM/cPanel already know how to intuitively balance that out or can that scenario cause a potential serious problem (in addition I/O "spike and crawl") , or is there a better way to avoid the clash between the two?

I'm really sorry for the long question but I don't know how to put it into better words.

Thanks for the Webinar this morning, greatly appreciated!

 

I am fine by it. Go ahead. However, please advice the new thread and where to find it in this forum as I am new here. Thanks.

 

Please could you tell me when the recording of this webinar will be available? I missed it unfortunately, but I really want to catch up on this topic.

Thanks!

 

Hi,

I just found a BUG in this option. When I remove features like phpMyAdmin, the Icon for phpMyAdmin disapears from the account's C-Panel but if you know the path (3rdparty/phpMyAdmin/index.php) you can access it anyway. How can I make sure it's safe to use the features option to remove access to certain features for an account?

Tnx.