aojea

apiVersion: apps/v1
kind: Deployment
metadata:
  name: httpd-deployment
  labels:
    app: MyApp
spec:
  replicas: 2
  selector:
    matchLabels:

aojea

apiVersion: apps/v1
kind: Deployment
metadata:
  name: httpd-deployment
  labels:
    app: MyDualApp
spec:
  replicas: 2
  selector:
    matchLabels:

aojea

# full credit https://dev.to/selfup/concurrent-tcp-server-in-go-4afp
package main

import (
    "bufio"
    "fmt"
    "log"
    "net"
)

aojea

package main

import (
	"fmt"
	"net"
)

// broadcastAddress returns the broadcast address of the subnet
func broadcastAddress(subnet *net.IPNet) net.IP{
	n := len(subnet.IP)

aojea

# Create 2 network namespaces
sudo ip netns add NorthNS
sudo ip netns add SouthNS

# Connect the namespaces using a veth pair
sudo ip link add name vethSouth type veth peer name vethNorth
sudo ip link set netns NorthNS dev vethNorth
sudo ip link set netns SouthNS dev vethSouth

# Configure the namespaces network so they can reach each other

aojea

#!/bin/bash
# Go to the kubernetes repo
cd $GOROOT/src/k8s.io/kubernetes
# Obtain all k8s releases
git log --tags --simplify-by-decoration --pretty="format:%ai %d" | grep -E 'v1.\d+.0\)' > git.k8s.releases
# Obtain all commits with ipv6 in its commit
git log --pretty=format:"%ci %s" --all | grep -i ipv6 | cut -d- -f1,2 | uniq -c > git.ipv6.txt
# Plot it
gnuplot -p << EOF
set title "Kubernetes IPv6 commits per month"

aojea

Service

kubectl --context kind-kind  get service my-service -o yaml
apiVersion: v1
kind: Service
metadata:
  annotations:
    kubectl.kubernetes.io/last-applied-configuration: |

aojea

from kubernetes import client, config
import sys

# Obtain the namespace, the service name  and the lb ip as the arguments
if len(sys.argv) != 4:
    print ("Usage: lb.py namespace service_name ip")
    sys.exit(1)

ns = sys.argv[1]
name = sys.argv[2]

aojea

package main

import (
        "fmt"
        "net"
        "time"
)

func main() {
        fmt.Println(CreateListener("", "0.0.0.0:9999"))

aojea

How to repro

$ exec 3> /run/xtables.lock

$ flock 3

$ python getlock.py
2023-09-12 15:21:24.453191 WARNING: process with pid: /proc/25720, cmdline: -su, accessing the lock for 5 seconds
 PID TTY STAT TIME COMMAND