Clivern

import akka.actor.{ Actor, ActorRef, Props, ActorSystem }

case class ProcessStringMsg(string: String)
case class StringProcessedMsg(words: Integer)

class StringCounterActor extends Actor {
  def receive = {
    case ProcessStringMsg(string) => {
      val wordsInLine = string.split(" ").length
      sender ! StringProcessedMsg(wordsInLine)

Clivern

sudo apt-get update
sudo apt-get -y upgrade

cd /tmp
wget https://dl.google.com/go/go1.12.linux-amd64.tar.gz
sudo tar -xvf go1.12.linux-amd64.tar.gz
sudo mv go /usr/local

export GOROOT=/usr/local/go
export GOPATH=$HOME/go

Clivern

• cron is a time based job scheduling service.
• crontab a program for CRUD your jobs schedules.
• use cron to schedule & automate tasks

0 2 * * * /root/db_backup > /tmp/db.log 2>&1

Clivern

$ export PUBLIC_IP=54.196.167.255

$ docker run -d -p 8001:8001 -p 5001:5001 quay.io/coreos/etcd:v0.4.6 -peer-addr ${PUBLIC_IP}:8001 -addr ${PUBLIC_IP}:5001 -name etcd-node1

$ docker run -d -p 8002:8002 -p 5002:5002 quay.io/coreos/etcd:v0.4.6 -peer-addr ${PUBLIC_IP}:8002 -addr ${PUBLIC_IP}:5002 -name etcd-node2 -peers ${PUBLIC_IP}:8001,${PUBLIC_IP}:8002,${PUBLIC_IP}:8003

$ docker run -d -p 8003:8003 -p 5003:5003 quay.io/coreos/etcd:v0.4.6 -peer-addr ${PUBLIC_IP}:8003 -addr ${PUBLIC_IP}:5003 -name etcd-node3 -peers ${PUBLIC_IP}:8001,${PUBLIC_IP}:8002,${PUBLIC_IP}:8003

$ curl -L $PUBLIC_IP/v2/stats/leader

Clivern

export NODE1=127.0.0.1
docker volume create --name etcd-data
export DATA_DIR="etcd-data"
export REGISTRY=quay.io/coreos/etcd

docker run -d \
  -p 2379:2379 \
  -p 2380:2380 \
 --volume=${DATA_DIR}:/etcd-data \

Clivern

package main

import (
	"context"
	"fmt"
	"log"
	"net/http"
	"time"
)

Clivern

curl -s \
    --form-string "token=$1" \
    --form-string "user=$2" \
    --form-string "title=$3" \
    --form-string "sound=none" \
    --form-string "message=$4" \
    https://api.pushover.net/1/messages.json

Clivern

Revert the full commit

Sometimes you may want to undo a whole commit with all changes. Instead of going through all the changes manually, you can simply tell git to revert a commit, which does not even have to be the last one. Reverting a commit means to create a new commit that undoes all changes that were made in the bad commit. Just like above, the bad commit remains there, but it no longer affects the the current master and any future commits on top of it.

git revert {commit_id}'

About History Rewriting

Delete the last commit

Deleting the last commit is the easiest case. Let's say we have a remote origin with branch master that currently points to commit dd61ab32. We want to remove the top commit. Translated to git terminology, we want to force the master branch of the origin remote repository to the parent of dd61ab32:

Clivern

1. Clone your fork:

git clone [email protected]:YOUR-USERNAME/YOUR-FORKED-REPO.git

2. Add remote from original repository in your forked repository:

cd into/cloned/fork-repo
git remote add upstream git://github.com/ORIGINAL-DEV-USERNAME/REPO-YOU-FORKED-FROM.git
git fetch upstream

Clivern

# local_k8s.sh https://github.com/kubernetes/kubernetes.git master v1.20.2

# Install Docker
cd /tmp

# Install Docker
apt-get update
apt-get -y install make docker.io
systemctl enable docker