We got it. Had to open the Nginx logs and noticed too many "posts" in the error log. Dug in and it was three ranges overseas all hitting with a "post timeout attack." It was a light DDoS where sessions were being opened and held causing nginx to wait on a timeout. This caused Apache to just increment forever. Once we blocked those ranges, the Apache thread count started to drop for the first time, and memory started to release. And the continuous flood of nginx error logs ceased.

If you are looking at nginx error logs, this is what you look for: upstream timed out (110: Connection timed out) while reading response header from upstream, client:

You can use this command to collect the offending IP addresses:

grep "upstream timed out" error.log | cut -d' ' -f20

Then use your firewall to shut them down. We are all good now! Woot.

Well let's talk about fedora and updating killing a laptop lol....

@connorsoliver said in An Overview of RAID - CompTIA A+ 220-901 220-902 Video Training by Prof. Messer:

Is using a RAID 1 configuration faster as well? Or is its main purpose so if you lose one of the drives you have a backup?

Primary purpose is definitely data protection. But RAID 1 provides a 200% read performance benefit over using a single drive. Write performance is the same as a single drive.

@connorsoliver said in An Overview of Storage Devices - CompTIA A+ 220-901 220-902 Video Training by Prof. Messer:

What did he mean when he said there's only a limited number or writes on a USB flash drive.

So this is a small mistake on the A+ material. They are making assumptions about the storage media based on the communications protocol. But it's based on very common things. A standard USB flash drive using a flash memory technology that "wears out" as you write to it, but essentially never wears out as you read it.

So the way that a USB stick is "meant to be used" is that you store things on it and read it a lot. You can change it, but it isn't meant for constant writes.

So under "normal" use, USB sticks last a long time. But it you write to it constantly (like when using it as swap) you will cause the memory chip(s) to die quickly.

@connorsoliver said in Installing and Configuring Expansion Cards - CompTIA A+ 220-901 220-902 Video Training by Prof. Messer:

I've seen that people have used two graphics cards in a setup. How does this work exactly? I'm assuming you don't use the video outputs of both graphics cards.

Generally it is handled by a proprietary "bridge" for those specific cards that makes two (or more) cards act as one. Same as have two CPUs in a single PC.

@connorsoliver said in Understanding PC Memory - CompTIA A+ 220-901 220-902 Video Training by Prof. Messer:

What exactly does registered memory do?

Wikipedia has about the best explanation of this. Mostly we ignore this, IT people really don't think about registered vs non-registered memory, that's something bench people worry about or your server vendor, but not IT. CompTIA mentions it because it is a bench exam.

Registered (also called buffered) memory modules have a register between the DRAM modules and the system's memory controller. They place less electrical load on the memory controller and allow single systems to remain stable with more memory modules than they would have otherwise. When compared with registered memory, conventional memory is usually referred to as unbuffered memory or unregistered memory. When manufactured as a dual in-line memory module (DIMM), a registered memory module is called an RDIMM, while unregistered memory is called UDIMM or simply DIMM.

Registered memory is often more expensive because of the lower number of units sold and additional circuitry required, so it is usually found only in applications where the need for scalability and robustness outweighs the need for a low price – for example, registered memory is usually used in servers.

DDR2 uses a clock speed twice as high as the bus speed. So DDR2 is double the speed of DDR given the same bus. The clock that the computer provides to the RAM is the same speed. But the memory clock speed in these cases as either 1x or 2x the bus speed from the computer. So the clock speed is double.

@travisdh1 said in Motherboard Jumpers and Connectors - CompTIA A+ 220-901 220-902 Video Training by Prof. Messer:

@Dashrender said in Motherboard Jumpers and Connectors - CompTIA A+ 220-901 220-902 Video Training by Prof. Messer:

@travisdh1 said in Motherboard Jumpers and Connectors - CompTIA A+ 220-901 220-902 Video Training by Prof. Messer:

@connorsoliver said in Motherboard Jumpers and Connectors - CompTIA A+ 220-901 220-902 Video Training by Prof. Messer:

Why are jumpers a thing? It seems like there would be a more effective way of doing the things that they are used for.

I think the last jumper I used was the last IDE HDD I used. That was at least only a single jumper to deal with.

Anyone else remember the days of 486 boards and the masses of jumpers to set all the board settings instead of having everything set in the BIOS?

486, you youngin'. 😛

I was messing with computers all the way back to the 80-86 days, just didn't have one at home till the 486 era.

The first computer I purchased (at age 13) was an 8086. though I think 286 or 386's were out at the time.

@zachary715 said in Linux Options for Dell PowerEdge 2950 II:

Just curious what role this server will be playing...

Web server

Worth noting that the issue comes back when you upgrade to Fedora 31 as well. Same fix still applies.

So, easy fix, the ca_stag2 was a staging DB that was not needed and was not current. The whole thing appears to have corrupted. So I simply "moved" that entire directory to /tmp (just in case I had to put it back) and then MySQL could fire up.

Here is what showed up in the unit...

https://assets.curvature.com/sites/default/files/pdf/GLC-SX-MMD-CURV.pdf

@scottalanmiller said in Updating to Fedora 30 Gives Pix Error:

Doing an upgrade from Fedora 29 to Fedora 30 and you get...

Error: Problem: package pix-1.8.2-1.fc29.x86_64 requires libexiv2.so.26()(64bit), but none of the providers can be installed - exiv2-libs-0.26-12.fc29.x86_64 does not belong to a distupgrade repository - problem with installed package pix-1.8.2-1.fc29.x86_64 (try to add '--skip-broken' to skip uninstallable packages)

This seems to happen with most normal workstation installs of Fedora. Easiest thing to do is simply remove Pix.

sudo dnf remove pix -y

Your update should work fine after that.

I don't ever use it. But, yeah it is there by default.

@StuartJordan I kinda like the netplan approach (ducks for cover)

Dragging and dropping todos between notebooks - I really like that

You check this? http://www.readynas.com/download/documentation/support/ReadyNAS-LED.pdf