Docker Swarm VS Docker Compose

Docker Documentation

When I sought help, a senior engineer simply asked, “Did you deploy it using Docker?” That’s when it hit me: I had missed a critical step. Determined to fix my mistake, I cleaned up the server, removed all dependencies and tools installed initially, and started fresh. This time, I focused on learning Docker.

The official Docker documentation is your comprehensive guide to all things Docker. While it might seem obvious, it's worth highlighting that this is one of the best-maintained technical documentations out there.

Docker Docs

Docker Docs: https://docs.docker.com/

Docker installed on your machine (Install Docker).

We will talk about downloading and getting to run Docker in our next session, but for now feel free to explore their resources on their website!🥰

Docker Documentation

I don't recommend using docker.io today as it will install an older version (at the time of writing this post, it is 24.0.7 on Ubuntu 22.04) and most of the tutorials will show you features based the official version and the official documentation.

#!/bin/bash # Update the system sudo apt-get update -y sudo apt-get upgrade -y # Install Git sudo apt-get install -y git # Install Docker sudo apt-get install -y apt-transport-https ca-certificates curl software-properties-common curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null sudo apt-get update -y sudo apt-get install -y docker-ce docker-ce-cli containerd.io # Add the 'ubuntu' and 'ssm-user' to the Docker group sudo usermod -aG docker ubuntu sudo usermod -aG docker ssm-user id ubuntu ssm-user sudo newgrp docker # Enable and start Docker sudo systemctl enable docker.service sudo systemctl start docker.service # Install Docker Compose v2 sudo mkdir -p /usr/local/lib/docker/cli-plugins sudo curl -SL https://github.com/docker/compose/releases/download/v2.23.3/docker-compose-linux-x86_64 -o /usr/local/lib/docker/cli-plugins/docker-compose sudo chmod +x /usr/local/lib/docker/cli-plugins/docker-compose # Add swap space sudo dd if=/dev/zero of=/swapfile bs=128M count=32 sudo chmod 600 /swapfile sudo mkswap /swapfile sudo swapon /swapfile echo "/swapfile swap swap defaults 0 0" | sudo tee -a /etc/fstab

--- - name: Run update ansible.builtin.apt: name: aptitude state: latest update_cache: true - name: Install dependencies ansible.builtin.apt: name: - net-tools - apt-transport-https - ca-certificates - curl - software-properties-common - python3-pip - virtualenv - python3-setuptools - gnupg-agent - autoconf - dpkg-dev - file - g++ - gcc - libc-dev - make - pkg-config - re2c - wget state: present update_cache: true - name: Add Docker GPG apt Key ansible.builtin.apt_key: url: https://download.docker.com/linux/ubuntu/gpg state: present - name: Add repository into sources list ansible.builtin.apt_repository: repo: deb [arch=amd64] https://download.docker.com/linux/ubuntu {{ ansible_lsb.codename }} stable state: present filename: docker - name: Install Docker ansible.builtin.apt: name: - docker-ce - docker-ce-cli state: present update_cache: true - name: Add non-root to docker group user: name: ubuntu groups: [docker] append: true - name: Install Docker module for Python ansible.builtin.pip: name: docker - name: Install Docker-Compose ansible.builtin.get_url: url: https://github.com/docker/compose/releases/download/1.29.2/docker-compose-Linux-x86_64 dest: /usr/local/bin/docker-compose mode: '755' - name: Create Docker-Compose symlink ansible.builtin.command: cmd: ln -s /usr/local/bin/docker-compose /usr/bin/docker-compose creates: /usr/bin/docker-compose - name: Restart Docker ansible.builtin.service: name: docker state: restarted enabled: true

Docker Compose v2.30.0 has introduced lifecycle hooks, making it easier to manage actions tied to container start and stop events. This feature lets developers handle key tasks more flexibly while keeping applications clean and secure.

curl -SL https://github.com/docker/compose/releases/download/v2.23.0/docker-compose-linux-x86_64 -o $DOCKER_CONFIG/cli-plugins/docker-compose

sudo curl -L https://github.com/docker/compose/releases/latest/download/docker-compose-$(uname -s)-$(uname -m) -o /usr/local/bin/docker-compose sudo chmod +x /usr/local/bin/docker-compose docker-compose version

Features: REST-like CQRS HTTP-API, Faceted Search, Full-text Search Interface: OpenAPI, JSON, JSON API, JSON Schema Query Languages: SQL dialect, Cypher, Gremlin, MQL, GraphQL Ingest Protocols: OAI-PMH, S3 Ingest Encoding: XML Ingest Formats: DataCite, DublinCore, MARC, MODS Deployment: Compose, Docker-Compose, Podman-Compose, K8s (via Kompose) Components: ArcadeDB, Connect, Lowdefy License: MIT

If you're using Docker Compose, you can view logs for multiple services at once.

But, this is not how images are used in production applications. Docker Compose is used to run and manage multiple docker images.

Docker Compose is an orchestration tool for single and multi-container Dockerized applications. It allows users to define and configure one or more services and their necessary options, volumes, and networks. Compose will then handle launch and orchestration of the application with the docker compose up command.

Docker Compose extends the idea of Docker by orchestrating multiple containers, allowing you to manage complex applications as easily as serving a dessert buffet.