ursuad

# Source: https://flowerinthenight.com/blog/2019/02/05/golang-cobra-klog
package main

import (
	goflag "flag"

	"github.com/spf13/cobra"
	flag "github.com/spf13/pflag"
	"k8s.io/klog"
)

ursuad

package main

import (
  "fmt"
  "math"
  "strconv"
)

var (
	sizeInMB float64 = 999 // This is in megabytes

ursuad

#!/bin/bash
interfaces=( $(netstat -in | egrep 'utun\d .*\d+\.\d+\.\d+\.\d+' | cut -d ' ' -f 1) )
rulefile="rules.tmp"
echo "" > $rulefile
sudo pfctl -a com.apple/tun -F nat
for i in "${interfaces[@]}"
do
  RULE="nat on ${i} proto {tcp, udp, icmp} from 192.168.64.0/24 to any -> ${i}"
  echo $RULE >> $rulefile
done

ursuad

Keybase proof

I hereby claim:

• I am ursuad on github.
• I am ursuad (https://keybase.io/ursuad) on keybase.
• I have a public key ASA0k9R6djMVQSjquz69dEZEiAGa44zliIFXotpuntTVdwo

To claim this, I am signing this object:

ursuad

# Ubuntu 14.04 don't have nsenter - the straight forward way required me to install build tools and etc.
# I preferred to keep the system clean and install nsenter in a container and then copy the command to the host
# Note - its also possible to run nsenter from a container (didn't tried) https://github.com/jpetazzo/nsenter

# start a container
docker run --name nsenter -it ubuntu:14.04 bash

## in the docker
apt-get update
apt-get install git build-essential libncurses5-dev libslang2-dev gettext zlib1g-dev libselinux1-dev debhelper lsb-release pkg-config po-debconf autoconf automake autopoint libtool

ursuad

Run this in order to backup all you k8s cluster data. It will be saved in a folder bkp. To restore the cluster, you can run kubectl apply -f bkp.

Please note: this recovers all resources correctly, including dynamically generated PV's. However, it will not recover ELB endpoints. You will need to update any DNS entries manually, and manually remove the old ELB's.

Please note: This has not been tested with all resource types. Supported resource types include:

• services
• replicationcontrollers
• secrets
• deployments
• horizontal pod autoscalers

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apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: federation-apiserver
  namespace: federation
  labels:
    app: federated-cluster
spec:
  template:
    metadata:

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apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: federation-controller-manager
  namespace: federation
  labels:
    app: federated-cluster
spec:
  template:
    metadata:

ursuad

Kafka Topics

List existing topics

bin/kafka-topics.sh --zookeeper localhost:2181 --list

Describe a topic

bin/kafka-topics.sh --zookeeper localhost:2181 --describe --topic mytopic

Purge a topic

bin/kafka-topics.sh --zookeeper localhost:2181 --alter --topic mytopic --config retention.ms=1000

... wait a minute ...

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/* Exercise: Loops and Functions #43 */
package main

import (
	"fmt"
	"math"
)

func Sqrt(x float64) float64 {
	z := float64(2.)