drmalex07

README - Setup K3s cluster (multiple nodes)

Download k3s binary on all machines at /usr/local/bin (see instructions at https://k3s.io/)

1. Setup server (controlplane)

Prepare env file for the service unit (/etc/default/k3s). For example:

INTERNAL_IP=10.0.5.19

drmalex07

import java.time.Duration;
import java.util.concurrent.Callable;
import java.util.concurrent.DelayQueue;
import java.util.concurrent.Delayed;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

public class DelayQueueExample
{

drmalex07

README - Checkout subtree of a Git subdirectory

See also: https://unix.stackexchange.com/questions/233327/is-it-possible-to-clone-only-part-of-a-git-project

Clone with a specific history depth (--depth) and start at the root of the repository (--sparse). You can also filter-out BLOB files. For example:

git clone --sparse --depth 1 --filter blob:none --branch master https://github.com/NowhereLand/helloworld

Change directory into the newly-cloned repository and enable sparse-checkout mechanism (to fetch parts of the subtree in steps of increasing depth)

drmalex07

README - Run a Flyway migration from a Docker container

See also: https://flywaydb.org/documentation/configuration/configfile

Prepare basic Flyway configuration (no sensitive data inside), say at config/flyway.conf:

# vim: set syntax=jproperties:
# See https://flywaydb.org/documentation/configuration/configfile
flyway.schemas = foo
flyway.defaultSchema = foo

drmalex07

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

const int MAX_LINE_SIZE = 10;

int main(int argc, char **argv){

    char line[MAX_LINE_SIZE + 2];

drmalex07

import java.util.Objects;

/**
 * Mimic escaping logic from Python {@code escapism} package.
 */
public class Escapism
{
    public static final String SAFE_CHARS = "abcdefghijklmnopqrstuvwxyz0123456789";
 
    public static final char ESCAPE_CHAR = '-';

drmalex07

#ifndef _WEIGHTED_GRAPH_HPP
#define _WEIGHTED_GRAPH_HPP 1

#include <iostream>
#include <limits>
#include <vector>
#include <set>
#include <unordered_set>
#include <queue>
#include <stdexcept>

drmalex07

README - Setup nullmailer

1. Prepare the inventory

An example inventory hosts.yml:

---
all:
  vars:
    # ...

drmalex07

README - Restore IPVS table (systemd service)

Lets assume our IPVS table is saved under /usr/local/etc/ipvs-table (e.g. as the output of ipvsadm -S).

Create the service file at /etc/systemd/system/restore-ipvs-table.service:

[Unit]
Description=Restore IPVS table from file
After=network.target

drmalex07

public class DurationToString
{
    private final Duration duration;
    
    private final TimeUnit unit;

    private DurationToString(Duration d, TimeUnit u)
    {
        this.duration = d;
        this.unit = u;