Ever need to track the performance of your internet connection in a pinch? I did the other day when a customer we installed DIA services for complained of poor performance. I’ve tried many schemes in the past to do this kind of testing and this time I wanted to do something new. I also wanted
I just finished building a really nice Windows 10 home workstation to replace my aging and sluggish 2013 Mac Pro system. I store most of my data on CentOS 7 server with over 40TB of RAID backed storage volumes.
I’ve struggled to improve Samba (SMB) performance between my Mac Pro (Late 2013) running OS X Yosemite 10.10.2 and my CentOS 6.6 Linux server. The server has a large ZFS share with all my backups and archives as well as various KVM instances running off SSDs. My Mac Pro absolutely must access that ZFS share
A few months ago we all saw the dramatic boom in NTP reflection attacks. These attacks exceeded DNS reflection that was so common before it. At the time I was personally experiencing consistent 10 to 40+ Gbps attacks. After a while they started to die down in frequency and volume. I still see many NTP
I see this topic come up a lot with users who migrate to one of our servers or to their own setup with cPanel and suPHP. The user or their customers will install a PHP script such as wordpress, concrete5, etc… Upon testing their installation they will get 500 ISE (Internal Server Error) in their
So you’ve probably not made the switch to InnoDB or XtraDB yet, shame on you! But tonight your server crashed, ran out of disk space or otherwise corrupted all of your active tables across various databases. Ouch! How are we going to fix this one? Many admins try using the myisamchk tool from shell in
So you’ve decided that you must run php as suPHP on your CentOS 6 based LAMP stack. This is a great idea for security on a multi-site or multi-user environment. Of course management panels like cPanel make running suPHP very easy, but what about the rest of us? Many of us do not use cPanel,
AWK is a powerful tool, a language really, that every administrator needs to know. I recommend everyone read about awk and learn how to use it. It can really make your day when you need to do something, quick and dirty. You will definitely win some friends with your awk skills, but probably not too
So lets say you have a text file called list.txt with entries like: What if you wanted to pick a random entry? The easiest solution is to use the ‘shuf’ tool, which is standard on CentOS as part of coreutils. The output would be a random line from our file!