DevOps Developer with Docker Salary in 2024

Where is Docker used?

Containerize and Mesmerize

• Squashing bugs becomes a breeze in isolated container jungles, a safe haven for trying out quirky code without the fear of apocalypse.

Scaling Mountains with Containers

• Scaling applications is like herding sheep with Docker. Containers can be multiplied faster than rabbits, each minding its own business.

Consistency in the Face of Chaos

• Ever tried to make identical cupcakes in a home kitchen? Docker ensures your code 'bakes' the same in every environment, from your machine to Mars.

Legacy Code Time Machine

• Legacy code can feel like an old family recipe. Docker containers let you run that ancient code without summoning spirits from the tech-past.

Docker Alternatives

Podman

Podman is an open-source, daemonless container engine for developing, managing, and running OCI Containers on your Linux System, designed to be a drop-in replacement for Docker.

# Running a container with Podman
podman run -dt -p 8080:80/tcp docker.io/library/nginx

• Doesn't require a daemon

• Can run rootless containers

• Directly manipulable with systemd

• Lacks the full ecosystem of Docker

• Less community traction compared to Docker

• Tooling may not be as mature or feature-rich

Kubernetes

Kubernetes is a portable, extensible open-source platform for managing containerized workloads and services.

# A simple Kubernetes pod definition
apiVersion: v1
kind: Pod
metadata:
  name: nginx
spec:
  containers:
  - name: nginx
    image: nginx

• Excellent for orchestration of containers

• Self-healing mechanisms with automatic scaling

• Large community and ecosystem

• Steep learning curve

• Complex setup and maintenance

• Often overkill for simple projects

LXD

LXD is a next-generation system container and virtual machine manager offering a Docker-like experience to run Linux containers.

# Launching a new container with LXD
lxc launch ubuntu:18.04 mycontainer

• Combines features of VMs and Docker-like containers

• Full Linux operating system inside containers

• Supports container snapshots and migration

• Focused more on system containers than apps

• Mostly limited to Linux workloads

• Less mainstream usage in microservices

Quick Facts about Docker

Unleashing Container Chaos: Docker Docks in 2013

Picture this: it's 2013, the tech world is bustling with innovation, and out pops Docker, crafted by the tech whiz Solomon Hykes and his savvy crew at dotCloud (which, spoiler alert, undergoes a magical transformation and is now known as Docker Inc). Docker swaggers into the realm of software development, toting its containerization coolness that lets you package your app and its entourage of dependencies into a neat, portable container. Developers everywhere scoff at the ancient ways of the past and revel in the Docker revolution.

Whale of a Time: The Docker Symbol You Can’t Forget

Ever seen a whale cheerfully hauling a bunch of containers? That's Docker's adorably mighty mascot, cleverly symbolizing the weighty task Docker takes on. In the Docker-verse, this whale not-so-gently nudged aside clunky old virtual machines and declared, "Containers for everyone!" And thus began the era where small is big, and everybody wants a piece of the container pie. #TeamWhale

Docker Gets a New Playmate: Meet Moby, ca. 2017

In the ever-so-energetic world of Docker, 2017 is a year to remember. Docker decided it was time to play matchmaker and introduced us to Moby: Docker's open-source offspring, designed to be the keystone of container ecosystems. Geeks and nerds alike were ecstatic, tinkering away with their newfound friend, and relishing in the joys of creating custom container-based systems. A match made in tech heaven, I tell you!

The Code Whisperer: Dockerfile Speaks Volumes

# Behold the mighty Dockerfile: a recipe for container creation!
FROM python:3.8-slim
WORKDIR /code
COPY . /code
RUN pip install -r requirements.txt
CMD ["python", "app.py"]

With this little incantation, developers summon apps into containers with the ease of a microwave dinner. It's the software equivalent of "just add water", or in this context, "just build and run". This Dockerfile spells out the steps to conjure up a Python app in a cozy container, ready to be shipped out to the world faster than you can say "abracadabra!"

What is the difference between Junior, Middle, Senior and Expert Docker developer?

Top 10 Docker Related Tech

1. 
   

   Docker Compose

   
   

   Imagine trying to juggle twenty balls simultaneously; that's managing multiple Docker containers without Docker Compose. This tool is like having an extra pair of hands. It allows you to define and run multi-container Docker applications with ease, using a YAML file to configure the services. It’s like conducting an orchestra with a sandwich in your hand – efficient and oddly satisfying.

   
   

   
   version: '3'
   services:
     web:
       build: .
       ports:
        - "5000:5000"
     redis:
       image: "redis"

1. 
   

   Container Orchestration with Kubernetes

   
   

   Ever wanted to be the captain of a fleet of ships? Kubernetes lets you steer your container ships across the rough seas of the internet with precision. K8s, as the cool kids call it, helps manage, scale, and deploy containers like a well-played game of Battleship.

   
   

   
   kubectl run hello-world --image=gcr.io/google-samples/node-hello:1.0 --port=8080

1. 
   

   CI/CD with Jenkins

   
   

   If Docker containers are the shiny cars, then Jenkins is the assembly line that never sleeps. This continuous integration and delivery buddy can automate the building, testing, and deployment of your Dockerized apps. Jenkins pipelines flow smoother than a fresh jar of peanut butter!

   
   

   
   pipeline {
     agent any
     stages {
       stage('Build') {
         steps {
           sh 'echo "Building..."'
           // Build docker image
         }
       }
     }
   }

1. 
   

   Monitoring with Prometheus

   
   

   Being the Big Brother of your Docker containers is crucial, and Prometheus nails it with its monitoring prowess. Track the health and metrics of your containers as if you had an entire surveillance system at your fingertips. It's the digital equivalent of hover-parenting.

   
   

   
   - job_name: 'docker'
     static_configs:
     - targets: ['localhost:9090']

1. 
   

   Logging with ELK Stack

   
   

   Need to Sherlock Holmes your way through the logs of your Docker containers? The ELK Stack (Elasticsearch, Logstash, and Kibana) is your detective kit. It turns the cryptic log files into a map to buried treasure, highlighting where 'X' marks the spot for bugs.

   
   

   
   input {
     tcp {
       port => 5000
       type => syslog
     }
   }
   output {
     elasticsearch { hosts => ["localhost:9200"] }
     stdout { codec => rubydebug }
   }

1. 
   

   Infrastructure as Code with Terraform

   
   

   Calling all lazy developers who still want to rule their cloud kingdom! Terraform is your trusty spellbook for defining, launching, and managing infrastructure using simple, declarative code. It's like playing Minecraft with your infrastructure, but in real life.

   
   

   
   provider "aws" {
     region = "us-west-2"
   }
   
   resource "aws_instance" "example" {
     ami           = "ami-0c55b159cbfafe1f0"
     instance_type = "t2.micro"
   }

1. 
   

   Container Registry with Harbor

   
   

   Ever wished your Docker images had a cozy little villa to call home? Welcome to Harbor, the registry which ensures that your containers are stored and managed securely. Think of it as an exclusive hotel for Docker images, minus the outrageous minibar prices.

   
   

   
   docker push myregistrydomain.com/myproject/myrepo:mytag

1. 
   

   Networking with Calico

   
   

   Fancy having your own private internet for your containers? Calico is like a VIP club for container networking. It provides a secure and scalable network fabric for containers, featuring a bouncer that only lets in the packets you want.

   
   

   
   calicoctl create -f - <apiVersion: projectcalico.org/v3
   kind: NetworkPolicy
   metadata:
     name: deny-travel
     namespace: default
   spec:
     selector: all()
     types:
     - Ingress
     - Egress
   EOF

1. 
   

   Service Mesh with Istio

   
   

   Want a personal assistant for managing service-to-service communication in your containerized app? Istio is the Jeeves to your Wooster when it comes to routing, securing, and observing the network traffic between your Docker services. It's the Swiss Army knife in a world where every knife is pretty much a spoon.

   
   

   
   kubectl apply -f <(istioctl kube-inject -f myapp.yaml)

1. 
   

   Secrets Management with Vault

   
   

   Do you like keeping your secrets safe? Vault is like a digital Fort Knox for your sensitive data and API keys. It allows you to store, manage, and control access to tokens, passwords, certificates, and other secrets. Because leaving secrets lying around is about smart as using "password" as your password.

   
   

   
   vault write secret/hello value=world