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I guess

That this blog is back..? Apparently it just turned 9 years old. So why not celebrate?

Lately I've done a little coding. Just bash. My mom got hit with a ransomware attack so I went a tad crazy with a Pi-hole, Fail2Ban and now Firewalld (original Uncomplicated Fire Wall). It's all on a Fedora server running on that ancient nettop I was going to make into a NAS.

Current problem: Pi-hole web console won't cooperate and 403's me. Forbidden why? Fuck if I know. Fuck if I've had the energy to find out. I've got other, completely unrelated work.

But. yes so first order of business is unfuck the Pi-hole web console. It isn't the web server malfunctioning because Webmin still works, and it was previously working so it's something relatively recent. At any rate I can at least monitor its status if not its activity.

Next up on the docket: "Linux Attentive SERver Console". It's a silly name but it has some clear objectives:

Backup management

System resource monitoring

Fail2ban, Firewalld, and Pi-hole metrics

Email summaries and alerts

Web-based interface

Security and authentication

So it's a big project but one step at a time. First backup management, which already sort of exists. I have scripts that I need to get running properly with cron jobs with basic backup creation and management. So next step is to start expanding user control.

#coding #bash #scripting #server #web console #pi hole #fail2ban #firewalld

MP?

It doesn’t look like it’ll be happening. I’ve been going a bit overboard with spending on food and beer lately, so after I pay that off, I’ll be picking up a new phone then just building a rig. Unless AMD surprises with an early Zen release, it’ll be an A10-78x0K on the best mITX board I can find, probably slotted into a Fractal Node 202, but maybe a Node 304 if I decide I still care about using all the spare hard drives I have. There’s a slight chance I’ll go with an Asus ROG board and something slightly larger to accommodate future expansion a bit better, but either way the machine will be for a mix of gaming and coding. I haven’t been able to dive into studying lately, but I’m planning to get back to school either this fall or next spring, so I’ll have to make sure I’m not an absolute potato.

MP Redux

It’s happening. I just got offered employment, so I’m going to celebrate by either:

Getting a pair of refurbished Optiplex 780s to pair with the GX520 (found out this is likely a 64-bit CPU) babysitting.

Building out my old Celeron board as a NAS, with the GX520 getting some sort of a place between the modem I need to pick up and the rest of the network (firewalled VPN server?)

Edit to note: clearly the latter choice would not actually be a cluster, but it sort of takes MP to be a pun on Modus Ponens.

#computer science #beowulf #cluster computer #network attached storage #virtual private network #learning project

MP Reprise

The cluster may or may not happen. I have a Pentium 4 HT machine donated by my uncle that I think I’m going to try to string together with its lesser brethren into a Beowulf, and I may still get the Pis, but that might wait in order to build out the Sandy Bridge Celeron into a worthwhile microserver.

#beowulf #cluster computer #computer science

It’s true...

#smbc #saturday morning breakfast cereal #comic #computer #programmer

MP

So I’ve decided to go with ODROIDs instead of Raspberry Pis. The basic plan is to build out the mITX board I’ve had forever into the host node. I’d like to put LAMP on it too to get some more practicable experience, but it’s a Sandy Bridge Celeron, so that might necessitate its replacement as the head by something different. I’m just going to call it MP for now (it’s a stupid name, but this entire project is stupid.)

The plan so far:

1x Biostar NM70I-847 as host node 4x ODROID C1+ as client nodes 1x 4-port AC-USB adapter or powered USB hub (allowing us for a mobile battery pack as an ad hoc UPS) as a single PSU 1x Linksys WRT-54G as the network switch, cause I have one

I’m thinking about getting some ODROID XU4s as well, either a single board for the aforementioned replacement head, or more. I’m also thinking of postponing building the 847 until I can afford to just make it a big NAS, and instead investing in a larger cluster of the cheaper machines, but I’ve been putting it off so long, I want to just build it, even if I run into multiplatform issues with MPI.

There are a few reasons for deciding on ODROIDs instead of the Pis. They're cheaper, more powerful, more power efficient, have gigabit ethernet, DDR3 instead of DDR2, and have the onboard eMMC pins (in case the need ever arises for more storage, the eMMC can be added for the system, freeing up the uSD slot.) Additionally, ODROID provides images for a larger variety of GNU/Linux distributions. These hopefully mean that MP will be feasibly scalable into something resembling a usefully large cluster, while providing a slightly lower barrier to entry. Scaling isn’t so important now, but the ability to expand the per-node storage and increase the speed on the interconnects without significantly modifying or replacing the nodes themselves is a boon on top of that lower sticker price.

#computer science #cluster computer #beowulf #odroid #c1+#xu4

Pants on Fire

I’m a liar, liar... I haven’t had occasion at school to start producing anything yet, but I’ve made up my mind to build a Raspberry Pi cluster computer (a bramble,) so maybe I’ll make it up with something neat. Since I’m dealing with data structures again, I figure I’ll mess around with distributed database storage and analysis, and maybe try to make some basic simulations (Monte Carlo comes to mind, but also Deep Dream, I really want to try running that myself.) If anyone has some ideas for simple cluster computing projects, especially in C++, Java, or Python, I’d love to hear them!

#school #computer science #programming #cluster computer #data structures #c #c++#java #python #raspberry pi #bramble

Thank God for Famine and Death

A friend and I have developed a highly complex metaphor for some of our favorite professors:

The head of engineering and physics, a horribly sadistic man with no sense of mercy, is clearly the rider of the pale horse. Unfortunately, I am the pale horse. He does not use a saddle. He does use a literal jackhammer. He’s basically one of my favorite people ever.

The head of computer science, a gloriously lazy, beer-drinking, E3-attending monster god is famine. Like the rider of the black horse, he is utterly impartial; you are either good enough, or quantitatively unworthy. We spend way too much time around this guy, but mad respect.

There is a wonderful man who recently joined the computer science department. Back in the day he worked for Sega (on the good Sonic games, I’m told.) Before that he was an officer in the Air Force. He is the rider of the red horse, laying waste to the hopes and dreams of lazy hopefuls as if without effort. His is the razor edged sword of finely honed wit. He also supposedly hangs out with mostly black dudes, and his toddler’s middle name is Von Hendrick. He is literally John Dabes.

Last, but certainly the opposite of least, is the rider of the white horse. He’s the recently ascended head of the math department, and holy shit. I really have no idea how he does it, but he is possibly the best teacher in history. Linear algebra at 8AM should never be fun. He made it fun. Immediately afterwards, we strolled to the computer science room for discrete math with him. It was like living for the first and second comings of Christ. He would make homework helps for us that proved invaluable. The funny part is that he does the vast majority of the problems just because he enjoys them. Calling him conquest is the only ironic one, because he is the exact opposite.

Another physics professor is probably my favorite. He once called me up after I’d turned in a test so we could have a laugh over that xkcd about theoretical vs applied sciences. Sadly, he loves Wars and hates Trek, so gets to be the beast. Seriously though? I find his level of nerdery highly suspicious. Only the literal spawn of Satan could be so awesome.

This brings me to my new vector calculus professor. He’s the antithesis of his department head. He’s arrogant, he’s repetitive, he’s incoherent, and he’s boring. He also thinks that color is commonly replicated using red, black, and blue. He is the serpent. He is not fork-tongued; his tenuous grasp of American lexicon precludes that. He is, however, misleading, vile, and venomous. This isn’t my opinion, this is just my explanation of what every single student of his says (I would tell you to check RateMyProfessor, but then you might guess where I live and anonymity or something like that.)

Other than that, my classes include advanced data structures with Famine, and static mechanics with Death. So, thank you, God, for Famine and Death.

PS: This blog might take over duties from my defunct personal blog, While False Return True. You guys might also want to check out one of my other blogs, which used to be for my technical interests. Nowadays it’s just Math Professor Quotes reblogs, since I just moved everything that isn’t programming to my main blog.

#school #computer science #four horsemen #shameless plug

Triumph

I have spent the summer conquering the province of Vidya Gamica and will be returning to share my code and scream about it in a couple of weeks when school resumes and I am once again producing any.

Project 5 Prompt

Hey there, this is the prompt for the fifth project in the Intro to Java as assigned by the professor I had (and currently ‘TA’ for; I’m using this term very liberally). I forgot my flash drive with such things at home, so I’m remaking it quickly, I’ll plan to post it shortly (and fix that one C post eventually...)

Project 5 (no GUI) - "Arrays, Files, and Sorting"

Part 1 - Make a number Generator main class

Randomize a number as the count, store the count in a file named numbers.txt

Using the first randomized number, create a loop generating new randomized numbers, storing each new number on a new line in the text file each iteration.

example of what numbers.txt might look like:

11

3

2

8

23

18

7

14

19

1

3

20

example of another run of your program's numbers.txt:

5 - this is the count

12 - this is the first number

9 - second number

5 - third

22 - fourth

5 - and fifth number

Part 2 - make a new file, a Sorting main class

Load the numbers.txt file from Part 1 of this project and read the data into an array.

Sort the numbers loaded in from number.txt from low to high using any sorting algorithm you like (for example, insertion sort).

Create a file named numout.txt and store the sorted numbers in the file, each number on its own line.

Part 3 - Strings

Make a list of 10 names, each on it's own line in a text editor and store them in a text file named names.txt. On the first line, however, type the number of name entries.

Part 4 - make a new file, a Names main class

Write a new class file with a main() method in the same project, use it to load in the names.txt, sort the names, and store them to a file called, nameout.txt. Each name on its own line.

example:

if your names.txt file is:

7

Skywalker, Luke

Hogan, Robert

Austin, Steve

Nelson, Anthony

Hawking, Stephen

Lucas, George

your nameout.txt should be:

Austin, Steve

Hawking, Stephen

Hogan, Robert

Lucas, George

Nelson, Anthony

Skywalker, Luke

#java #file i/o #sorting

mathprofessorquotes

Now, in order to see what’s going on behind the curtain here… actually C is a little rough around the edges so what’s behind the curtains is, well, you.

Computer Science professor complaining about C (via mathprofessorquotes)

upper-bound-beez

I wuv C++

For the record

I am ashamed of the algorithms I used in Infestation.java. They are horrendous and I have no excuse.

Infestation.java

This is the main file for the Infestation project.

Agent class

Human class

package project4;import java.util.*; //Use namespace util //Status key: //-1 Exit program // 0 Program idle/complete // 1 Program ready // 2 Program running public class Infestation { //Set max position and population limit values final static int MAXPOS = 1000; final static int MAXPOP = 203323; //Create human population array of maximum size static Human[] population = new Human[MAXPOP]; /*Create agent population array of size three per human plus the original agent*/ static Agent[] agents = new Agent[3*MAXPOP + 1]; //Initialize status to idle static int status = 0; //static String username; To be implemented //Create random static Random rand = new Random(); public static void main(String[] args) { //Create user input Scanner input = new Scanner(System.in); String choice; //Create user input container System.out.print("Welcome to Infection\n"); //While user has not chosen to exit while (status != -1) { System.out.println("(P)opulate" + "\n(R)elease Agent" + "\n(E)xit"); //Store user input and homogenize it choice = input.nextLine(); choice = choice.toUpperCase(); switch (choice) { case "P": populate(); break; case "R": run(); break; case "E": status = -1; break; default: System.out.println("Error"); break; } } } //Generates the human population private static void populate() { //Runs 203323 times for (int i = 0; i < MAXPOP; i++) { int x, y; //Random switch if (rand.nextBoolean()) { //Makes y positive random y = rand.nextInt(MAXPOS); //Random switch if (rand.nextBoolean()) { //Makes x positive random x = rand.nextInt(MAXPOS); } else { //Makes x negative random x = -rand.nextInt(MAXPOS); } } else { //Makes y negative random y = -rand.nextInt(MAXPOS); //Makes x random x = (rand.nextInt(2*MAXPOS) - MAXPOS); } //Generates new human at randomly generated x and y population[i] = new Human(x, y); } status = 1; //Program ready System.out.println("Map populated"); } private static void run() { status = 2; //Program running //Initialize human population counter int humanPop = MAXPOP; //Initialize agent population count int agentPop = 1; //Generate random x and y values int x = rand.nextInt(MAXPOS); int y = rand.nextInt(MAXPOS); //Create first agent at x and y agents[0] = new Agent(agentPop, x, y); //While program still running while (status != 0) { //Run through entire agent prompt for (int i = 0; i < agentPop; i++) { //If agent is dead or out of stamina if (agents[i].getStatus() == 0 || agents[i].getStatus() == 5) { break; } //Randomly pick 1 of four int pick = rand.nextInt(4); //Default and 0 is up String direction = "up"; switch (pick) { case 1: direction = "down"; break; case 2: direction = "left"; break; case 3: direction = "right"; break; default: break; } //Move agent in chosen direction for //a minimum of 1 and maximum of 4 spaces agents[i].move(direction, 5-status); //Run through entire human population for (int j = 0; j < MAXPOP; j++) { //Storing human position int pos[] = population[j].getPos(); //If agent can attack if (agents[i].attack(pos[0], pos[1])) { //Mark human dead population[j].setStatus(0); humanPop--; //Decrement human population count //Create three new agents for (int k = 0; k < 3; k++) { agents[agentPop+k] = new Agent(agentPop, x, y); agentPop++; } agents[i].setStatus(1); //Resets status } //Otherwise increase status else { int stat = agents[i].getStatus(); agents[i].setStatus(stat + 1); } } } //Run through every human for (int i = 0; i < MAXPOP; i ++) { //If dead if (population[i].getStatus() == 0) { break; } for (int j = 0; j < 4; j++) { //Randomly pick 1 of four int pick = rand.nextInt(4); //Default and 0 is up String direction = "up"; switch (pick) { case 1: direction = "down"; break; case 2: direction = "left"; break; case 3: direction = "right"; break; default: break; } //Move human in chosen direction for //a random value between 1 and 4 population[i].move(direction, rand.nextInt(4)+1); } //Run through agent population for (int j = 0; j < agentPop; j++) { //Store agent position int pos[] = agents[j].getPos(); //Check if human can attack if (population[i].attack(pos[0], pos[1])) { agents[j].setStatus(0); //Mark agent dead } } } //If either all humans or all agents are dead, end simulation if (humanPop == 0 || agentPop == 0) { status = 0; } } } }

#java

Agent.java

This is the agent class for the infestation project

Human class

Main class

package project4;

import java.util.Random;

public class Agent { //Set max position limit final static int MAXPOS = 1000; //Create random static Random rand = new Random();

private String id; //Agent identifier private int x; //Agent x coordinate private int y; //Agent y coordinate private int status; //Agent status //Generic constructor public Agent (int newID, int posx, int posy) { this.setID("agent" + newID); this.setPos(posx, posy); status = 1; } //Named constructor public Agent (String newID, int posx, int posy) { this.setID(newID); this.setPos(posx, posy); status = 1; } //Attack check public boolean attack (int posx, int posy) { return x == posx && y == posy; } //Interprets movement input public void move (String direction, int distance) { switch (direction) { case "up": movey(distance); break; case "down": movey(-distance); break; case "left": movex(distance); break; case "right": movex(-distance); break; default: break; } } //Moves up or down private void movey (int distance) { if (Math.abs(y + distance) > 1000) { y += distance; } } //Moves left or right private void movex (int distance) { if (Math.abs(x + distance) > 1000) { x += distance; } } //Returns agent identifier public String getID() { return id; } //Returns agent position public int[] getPos() { int[] pos = {x, y}; return pos; } //Returns agent status public int getStatus() { return status; } //Sets agent identifier public void setID (String newID) { id = newID; } //Sets agent position public void setPos(int posx, int posy) { if (Math.abs(posx) <= MAXPOS) { x = posx; }

if (Math.abs(posy) <= MAXPOS) { y = posy; } } //Sets agent status public void setStatus (int newStatus) { status = newStatus; } //Returns agent's information @Override public String toString() { String output; output = id + " " + x + "," + y; return output; } }

Human.java

This is the human class for the Infestation project

Agent class

Main class

package project4;

import java.util.Random;

public class Human { //Set max position limit final static int MAXPOS = 1000; //Create random static Random rand = new Random();

private String name; //Human name private String type; //Human class private String weapon; //Human weapon private int x; //Human x coordinate private int y; //Human y coordinate private int status; //Human status //Generic constructor public Human (int posx, int posy) { this.name = nameGen(); this.type = "Unknown"; this.weapon = weaponPick(); this.setPos(posx, posy); this.status = 1; } //Named constructor public Human (String name, int posx, int posy) { this.name = name; this.type = "Unknown"; this.weapon = weaponPick(); this.setPos(posx, posy); this.status = 1; } //Fully specific constructor public Human (String newName, String newType, String newWeapon, int posx, int posy) { name = newName; type = newType; weapon = newWeapon; setPos(posx, posy); status = 1; } //Generates random generic name private static String nameGen () { String alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; String[] names = {"John", "Jane", "Jack", "Jill"}; return names[rand.nextInt(4)] + " " + alphabet.charAt(rand.nextInt(26)) + "."; } //Picks a basic weapon for user private static String weaponPick () { String[] weapons = {"bare hands", "gun", "knife", "baseball bat"}; int i = rand.nextInt(3); return weapons[i]; } //Attack check public boolean attack (int posx, int posy) { return (x == posx && y == posy) && !weapon.contains("bare hands"); } //Interprets movement input public void move (String direction, int distance) { switch (direction) { case "up": movey(distance); break; case "down": movey(-distance); break; case "left": movex(distance); break; case "right": movex(-distance); break; default: break; } } //Moves up or down private void movey (int distance) { if (Math.abs(y + distance) > 1000) { y += distance; } } //Moves left or right private void movex (int distance) { if (Math.abs(x + distance) > 1000) { x += distance; } } //Returns human's name public String getName() { return name; } //Returns human's class public String getType() { return type; } //Returns human's weapon public String getWeapon() { return weapon; } //Returns human's position public int[] getPos() { int[] pos = {x, y}; return pos; } //Returns human's status public int getStatus() { return status; } //Renames human public void setName(String newName) { name = newName; } //Reclasses human public void setType(String newType) { type = newType; } //Changes human's weapon public void setWeapon(String newWeapon) { weapon = newWeapon; } //Changes human's position public void setPos(int posx, int posy) { if (Math.abs(posx) <= MAXPOS) { x = posx; }

if (Math.abs(posy) <= MAXPOS) { y = posy; } } //Change's human's status public void setStatus(int newStatus) { status = newStatus; } //Returns human's information @Override public String toString() { return name + " " + type + " " + weapon + " " + x + "," + y; }

}

In Java...

Who wants to see some more Java? Me neither! I’m going to post some soon anyway, just to spite us all.

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