#Docker Compose Guide

[virtualizationhowto]

Best Docker Containers Commands You Need to Know

Best Docker Containers Commands You Need to Know @vexpert #vmwarecommunities #100daysofhomelab #homelab #DockerBasics #MasteringDockerCommands #BestDockerContainers #DockerImagesExplained #DockerForWebApplications #DockerComposeGuide

There is arguably not a more familiar name with containerized technology than Docker. With its ability to streamline operations and optimize resources, Docker has shifted the paradigm from traditional virtual machines to containers. It has continued to evolve to enhance user-friendly features and functionalities, making it an ideal platform for managing Continuous Integration and Continuous…

[amalgamasreal]

So in this world of rising streaming costs and license holders unilaterally deciding to pull content from streaming channels I figured I'd compile a few guides for people who want to cut those cords. As a rhetorical exorcise I'm going to list out some guides on how someone might want to create their own local media streaming service and how to automate management and supply of content to it. ALL RHETORICAL

I'm not going to explain how to build a media server, people who go that extensive won't need these guides, but if you have the cash, and don't want to build your own server you can always buy a higher end NAS from synology or QNAP that runs docker engine and you should be good.

Please make sure to follow the instructions for each individual guide in order depending on your choices. RHETORICALLY.

First you install Docker:

https://www.virtualizationhowto.com/2023/02/docker-compose-synology-nas-install-and-configuration/

Then you install your download clients:

Newsgroups (you'll also need an account with a hosting service like Newshosting or Giganews as well as access to an indexer): https://drfrankenstein.co.uk/2021/07/30/setting-up-nzbget-in-docker-on-a-synology-nas/

Torrents (with this you'll need access to either public or private trackers): https://drfrankenstein.co.uk/2021/09/13/deluge-in-docker-on-a-synology-nas/

Then you install Jackett (this'll auto-manage all of your torrent trackers and create feeds for Sonarr and Radarr):

https://www.smarthomebeginner.com/install-jackett-using-docker/

Then you install Sonarr:

https://drfrankenstein.co.uk/2021/05/03/setting-up-sonarr-in-docker-on-a-synology-nas/

Then you install Radarr:

https://drfrankenstein.co.uk/2021/07/30/setting-up-radarr-in-docker-on-a-synology-nas/

Then you install Plex or Jellyfin:

Plex: https://drfrankenstein.co.uk/2021/12/06/plex-in-docker-on-a-synology-nas/

Jellyfin: https://drfrankenstein.co.uk/2022/09/03/jellyfin-in-docker-on-a-synology-nas-no-hardware-transcoding/

Then you install Overseerr or Jellyseerr:

Overseerr: https://drfrankenstein.co.uk/2022/03/19/overseerr-in-docker-on-a-synology-nas/

Jellyseerr (only use if you picked Jellyfin): https://drfrankenstein.co.uk/2022/09/04/jellyseerr-in-docker-on-a-synology-nas/

[thepopemobile]

How to host local Club Penguin Private Server (CPPS) on Silicon Mac (M1/M2/M3) thru play.localserver & Solero's Wand install.

I spent so long looking for a solution to this that I want to contribute what worked for me. I got so frustrated looking for something that worked, and I hope this guide will help others avoid that frustration.

This is NOT a guide on hosting or serving a CPPS. This is a guide on making a CPPS playable by locally hosting your server on your Silicon M1/M2/M3 Macbook. This worked on my M3 Macbook, and, in my experience, it seems the newer the hardware/operating system gets, the harder it is accomplish this.

DISCLAIMER *I do not know very much about this topic. I can paste commands into terminal and execute them, I know how to install DMG files I downloaded from the internet (the bar is in hell, I am aware), and I know how to enter play.localhost to run this in a browser. I am no expert; this guide is for beginners like myself who want a CPPS. This is beginner-level stuff. If you want advice or need help hosting, refer to the Wand Github page, Solero's Dash (an actual web-hosting solution for Houdini/Wand), Solero's discord, or, when in doubt, Google it. (I recommend only asking for help in Solero's discord for help AFTER trying your best to search for a solution, and even after that, trying to search key terms in their chat logs. They often have to repeat the same advice over, and over, and over again.)*

TLDR; IDK shit about shit

USING WAND INSTALLER

wand description from github: Wand makes it easy to configure dash, houdini and a media server utilizing docker & docker-compose.

All the assets are located here.

Installation instructions from the above link:

Installation script 1. run the script: bash <(curl -s https://raw.githubusercontent.com/solero/wand/master/install.sh) 2. Answer Questions which are: Database password (Leave blank for random password) Hostname (example: clubpenguin.com) (Leave empty for localhost) External IP Address (Leave empty for localhost) 3. Run and enjoy. Run this command: $ cd wand && sudo docker-compose up

The steps I took:

1. Install Docker via Terminal & Homebrew.

Installing the Docker DMG file did not work properly when I tried. I realized later that Docker is seperate from Docker Desktop (the DMG file). I got Docker to work by using Terminal to install Homebrew, and then using Homebrew to install Docker.

Indented text = paste into Terminal.

Command to install Homebrew:

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

Ensure Homebrew is installed:

brew --version

Install Docker:

brew install docker

Recommended: Install Docker Desktop (useful in determining if your server is running, stopped, or stuck in a restart loop).

brew install --cask docker

Run Docker Desktop:

open -a Docker

2. Run installation script:

bash <(curl -s https://raw.githubusercontent.com/solero/wand/master/install.sh)

From Github instructions:

Answer Questions which are:

Database password (Leave blank for random password)

Hostname (example: clubpenguin.com) (Leave empty for localhost)

External IP Address (Leave empty for localhost)

3. $ cd wand && sudo docker-compose up

This is what is provided in the Github. This command didn't work on Mac; I believe it's formatted for Linux OS. Here's how I broke it up and enabled it to run from Mac's Terminal.

Navigate to Wand directory:

cd wand

Double-check if you're in the right directory:

ls

Start Docker container:

docker-compose up

If the above doesn't work, try

docker compose up

or

brew install docker-compose

Takes a second...

Ensure Docker is running:

docker info

If it isn't, open the Docker Desktop application.

*After using compose up, this error may appear:*

WARN[0000] /Users/[user]/wand/docker-compose.yml: the attribute version is obsolete, it will be ignored, please remove it to avoid potential confusion

This is harmless. If you get annoyed by errors, this can be solved by:

nano docker-compose.yml

See Version 3.7 at the top? Delete that line.

Ctrl-X (NOT COMMAND-X) to exit, Y to save, Enter.

PLAY.LOCALHOST

Type http://PLAY.LOCALHOST into a browser.

Create a penguin.

Try logging in that penguin:

This step was agony. I'm not savvy with running obsolete or deprecated software, and, of course, Club Penguin (and Houdini/Wand's assest) uses Flash, which was discontinued, and timebombed by Adobe, in 2021.

I tried Ruffle. Club Penguin Journey uses Ruffle, so why can't I?

Running Ruffle in Firefox:

No luck.

In the Solero discord, they'll direct to this blog post:

This method does not work on Mac M1/M2/M3. The program is "out of date" and you cannot run it. It works on Macbook's running Sonoma and backward. I'm on an M3 running Sequoia.

they'll often post this video in the discord:

In theory, this method should work, and it does for many, but for whatever reason, not on my M3. I tried different versions of Ungoogled, I tried so many different patches of Pepperflash, and it never cooperated. I tried Pepperflash, I tried Fast Patch!, I tried dedicated Flash browsers, running Flash plugins for Pale Moon, Ungoogled, Waterfox, but I could never get past him.

Every time I see this stupid penguin's face I'm filled with rage. But I am going to save you that rage!!!

If you get this method to work, yay! I could not. Maybe I don't know enough about patching, maybe I'm a little tech stupid.

WHAT WORKED: Using a dedicated CPPS desktop application that allows you to plug in a URL.

I give you...

He is your solution, your answer to

I discovered this solution through Solero's Discord, when someone answered a question re: playing online.

Waddle Forever was not what I was looking forever, but I noticed in their credits:

The electron client is originally forked from the Club Penguin Avalanche client. The server is based in solero's works in reverse engineering the Club Penguin server (Houdini server emulator). The media server is also mostly from solero's media servers.

And that's how I found out the solution: Using CPA Client

Download the CPAvalanche Client

It runs Adode Flash x64. Easy peasy.

(the instructions are in Portuguese, but for English users:

Navigate to releases.

And download this one:

Once downloaded, open.

Drag into applications.

Run http://play.localhost through the client:

Open CPAvalanche Client. It will direct you to CPAvalance once loaded, but you're here because you want to play play.localhost.

Navigate to CPAvalanche Client next to your Apple. Click Mudar a URL do Club Penguin.

Press Sim.

URL: http://play.localhost

Ok.

Press Login once the page loads, and...

That's it! No more penguin! Have fun :)

CREDITS:

Solero Discord / Waddle Forever / Wand / CPA Client / Solero.Me

[yourservicesinfo]

Docker Migration Services: A Seamless Shift to Containerization

In today’s fast-paced tech world, businesses are continuously looking for ways to boost performance, scalability, and flexibility. One powerful way to achieve this is through Docker migration. Docker helps you containerize applications, making them easier to deploy, manage, and scale. But moving existing apps to Docker can be challenging without the right expertise.

Let’s explore what Docker migration services are, why they matter, and how they can help transform your infrastructure.

What Is Docker Migration?

Docker migration is the process of moving existing applications from traditional environments (like virtual machines or bare-metal servers) to Docker containers. This involves re-architecting applications to work within containers, ensuring compatibility, and streamlining deployments.

Why Migrate to Docker?

Here’s why businesses are choosing Docker migration services:

1. Improved Efficiency

Docker containers are lightweight and use system resources more efficiently than virtual machines.

2. Faster Deployment

Containers can be spun up in seconds, helping your team move faster from development to production.

3. Portability

Docker containers run the same way across different environments – dev, test, and production – minimizing issues.

4. Better Scalability

Easily scale up or down based on demand using container orchestration tools like Kubernetes or Docker Swarm.

5. Cost-Effective

Reduced infrastructure and maintenance costs make Docker a smart choice for businesses of all sizes.

What Do Docker Migration Services Include?

Professional Docker migration services guide you through every step of the migration journey. Here's what’s typically included:

- Assessment & Planning

Analyzing your current environment to identify what can be containerized and how.

- Application Refactoring

Modifying apps to work efficiently within containers without breaking functionality.

- Containerization

Creating Docker images and defining services using Dockerfiles and docker-compose.

- Testing & Validation

Ensuring that the containerized apps function as expected across environments.

- CI/CD Integration

Setting up pipelines to automate testing, building, and deploying containers.

- Training & Support

Helping your team get up to speed with Docker concepts and tools.

Challenges You Might Face

While Docker migration has many benefits, it also comes with some challenges:

Compatibility issues with legacy applications

Security misconfigurations

Learning curve for teams new to containers

Need for monitoring and orchestration setup

This is why having experienced Docker professionals onboard is critical.

Who Needs Docker Migration Services?

Docker migration is ideal for:

Businesses with legacy applications seeking modernization

Startups looking for scalable and portable solutions

DevOps teams aiming to streamline deployments

Enterprises moving towards a microservices architecture

Final Thoughts

Docker migration isn’t just a trend—it’s a smart move for businesses that want agility, reliability, and speed in their development and deployment processes. With expert Docker migration services, you can transition smoothly, minimize downtime, and unlock the full potential of containerization.

[rwahowa]

Postal SMTP install and setup on a virtual server

Postal is a full suite for mail delivery with robust features suited for running a bulk email sending SMTP server. Postal is open source and free. Some of its features are: - UI for maintaining different aspects of your mail server - Runs on containers, hence allows for up and down horizontal scaling - Email security features such as spam and antivirus - IP pools to help you maintain a good sending reputation by sending via multiple IPs - Multitenant support - multiple users, domains and organizations - Monitoring queue for outgoing and incoming mail - Built in DNS setup and monitoring to ensure mail domains are set up correctly List of full postal features

Possible cloud providers to use with Postal

You can use Postal with any VPS or Linux server providers of your choice, however here are some we recommend: Vultr Cloud (Get free $300 credit) - In case your SMTP port is blocked, you can contact Vultr support, and they will open it for you after providing a personal identification method. DigitalOcean (Get free $200 Credit) - You will also need to contact DigitalOcean support for SMTP port to be open for you. Hetzner ( Get free €20) - SMTP port is open for most accounts, if yours isn't, contact the Hetzner support and request for it to be unblocked for you Contabo (Cheapest VPS) - Contabo doesn't block SMTP ports. In case you are unable to send mail, contact support. Interserver

Postal Minimum requirements

- At least 4GB of RAM - At least 2 CPU cores - At least 25GB disk space - You can use docker or any Container runtime app. Ensure Docker Compose plugin is also installed. - Port 25 outbound should be open (A lot of cloud providers block it)

Postal Installation

Should be installed on its own server, meaning, no other items should be running on the server. A fresh server install is recommended. Broad overview of the installation procedure - Install Docker and the other needed apps - Configuration of postal and add DNS entries - Start Postal - Make your first user - Login to the web interface to create virtual mail servers Step by step install Postal Step 1 : Install docker and additional system utilities In this guide, I will use Debian 12 . Feel free to follow along with Ubuntu. The OS to be used does not matter, provided you can install docker or any docker alternative for running container images. Commands for installing Docker on Debian 12 (Read the comments to understand what each command does): #Uninstall any previously installed conflicting software . If you have none of them installed it's ok for pkg in docker.io docker-doc docker-compose podman-docker containerd runc; do sudo apt-get remove $pkg; done #Add Docker's official GPG key: sudo apt-get update sudo apt-get install ca-certificates curl -y sudo install -m 0755 -d /etc/apt/keyrings sudo curl -fsSL https://download.docker.com/linux/debian/gpg -o /etc/apt/keyrings/docker.asc sudo chmod a+r /etc/apt/keyrings/docker.asc #Add the Docker repository to Apt sources: echo "deb https://download.docker.com/linux/debian $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null sudo apt-get update #Install the docker packages sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin -y #You can verify that the installation is successful by running the hello-world image sudo docker run hello-world Add the current user to the docker group so that you don't have to use sudo when not logged in as the root user. ##Add your current user to the docker group. sudo usermod -aG docker $USER #Reboot the server sudo reboot Finally test if you can run docker without sudo ##Test that you don't need sudo to run docker docker run hello-world Step 2 : Get the postal installation helper repository The Postal installation helper has all the docker compose files and the important bootstrapping tools needed for generating configuration files. Install various needed tools #Install additional system utlities apt install git vim htop curl jq -y Then clone the helper repository. sudo git clone https://github.com/postalserver/install /opt/postal/install sudo ln -s /opt/postal/install/bin/postal /usr/bin/postal Step 3 : Install MariaDB database Here is a sample MariaDB container from the postal docs. But you can use the docker compose file below it. docker run -d --name postal-mariadb -p 127.0.0.1:3306:3306 --restart always -e MARIADB_DATABASE=postal -e MARIADB_ROOT_PASSWORD=postal mariadb Here is a tested mariadb compose file to run a secure MariaDB 11.4 container. You can change the version to any image you prefer. vi docker-compose.yaml services: mariadb: image: mariadb:11.4 container_name: postal-mariadb restart: unless-stopped environment: MYSQL_ROOT_PASSWORD: ${DB_ROOT_PASSWORD} volumes: - mariadb_data:/var/lib/mysql network_mode: host # Set to use the host's network mode security_opt: - no-new-privileges:true read_only: true tmpfs: - /tmp - /run/mysqld healthcheck: test: interval: 30s timeout: 10s retries: 5 volumes: mariadb_data: You need to create an environment file with the Database password . To simplify things, postal will use the root user to access the Database.env file example is below. Place it in the same location as the compose file. DB_ROOT_PASSWORD=ExtremelyStrongPasswordHere Run docker compose up -d and ensure the database is healthy. Step 4 : Bootstrap the domain for your Postal web interface & Database configs First add DNS records for your postal domain. The most significant records at this stage are the A and/or AAAA records. This is the domain where you'll be accessing the postal UI and for simplicity will also act as the SMTP server. If using Cloudflare, turn off the Cloudflare proxy. sudo postal bootstrap postal.yourdomain.com The above will generate three files in /opt/postal/config. - postal.yml is the main postal configuration file - signing.key is the private key used to sign various things in Postal - Caddyfile is the configuration for the Caddy web server Open /opt/postal/config/postal.yml and add all the values for DB and other settings. Go through the file and see what else you can edit. At the very least, enter the correct DB details for postal message_db and main_db. Step 5 : Initialize the Postal database and create an admin user postal initialize postal make-user If everything goes well with postal initialize, then celebrate. This is the part where you may face some issues due to DB connection failures. Step 6 : Start running postal # run postal postal start #checking postal status postal status # If you make any config changes in future you can restart postal like so # postal restart Step 7 : Proxy for web traffic To handle web traffic and ensure TLS termination you can use any proxy server of your choice, nginx, traefik , caddy etc. Based on Postal documentation, the following will start up caddy. You can use the compose file below it. Caddy is easy to use and does a lot for you out of the box. Ensure your A records are pointing to your server before running Caddy. docker run -d --name postal-caddy --restart always --network host -v /opt/postal/config/Caddyfile:/etc/caddy/Caddyfile -v /opt/postal/caddy-data:/data caddy Here is a compose file you can use instead of the above docker run command. Name it something like caddy-compose.yaml services: postal-caddy: image: caddy container_name: postal-caddy restart: always network_mode: host volumes: - /opt/postal/config/Caddyfile:/etc/caddy/Caddyfile - /opt/postal/caddy-data:/data You can run it by doing docker compose -f caddy-compose.yaml up -d Now it's time to go to the browser and login. Use the domain, bootstrapped earlier. Add an organization, create server and add a domain. This is done via the UI and it is very straight forward. For every domain you add, ensure to add the DNS records you are provided.

Enable IP Pools

One of the reasons why Postal is great for bulk email sending, is because it allows for sending emails using multiple IPs in a round-robin fashion. Pre-requisites - Ensure the IPs you want to add as part of the pool, are already added to your VPS/server. Every cloud provider has a documentation for adding additional IPs, make sure you follow their guide to add all the IPs to the network. When you run ip a , you should see the IP addresses you intend to use in the pool. Enabling IP pools in the Postal config First step is to enable IP pools settings in the postal configuration, then restart postal. Add the following configuration in the postal.yaml (/opt/postal/config/postal.yml) file to enable pools. If the section postal: , exists, then just add use_ip_pools: true under it. postal: use_ip_pools: true Then restart postal. postal stop && postal start The next step is to go to the postal interface on your browser. A new IP pools link is now visible at the top right corner of your postal dashboard. You can use the IP pools link to add a pool, then assign IP addresses in the pools. A pool could be something like marketing, transactions, billing, general etc. Once the pools are created and IPs assigned to them, you can attach a pool to an organization. This organization can now use the provided IP addresses to send emails. Open up an organization and assign a pool to it. Organizations → choose IPs → choose pools . You can then assign the IP pool to servers from the server's Settings page. You can also use the IP pool to configure IP rules for the organization or server. At any point, if you are lost, look at the Postal documentation. Read the full article

[lowendbox]

Running your own infrastructure can be empowering. Whether you're managing a SaaS side project, self-hosting your favorite tools like Nextcloud or Uptime Kuma, running a game server, or just learning by doing, owning your stack gives you full control and flexibility. But it also comes with a cost. The good news? That cost doesn’t have to be high. One of the core values of the LowEndBox community is getting the most out of every dollar. Many of our readers are developers, sysadmins, hobbyists, or small businesses trying to stretch limited infrastructure budgets. That’s why self-hosting is so popular here—it’s customizable, private, and with the right strategy, surprisingly affordable. In this article, we’ll walk through seven practical ways to reduce your self-hosting costs. Whether you’re just starting out or already managing multiple VPSes, these tactics will help you trim your expenses without sacrificing performance or reliability. These aren't just random tips, they’re based on real-world strategies we see in action across the LowEndBox and LowEndTalk communities every day. 1. Use Spot or Preemptible Instances for Non-Critical Workloads Some providers offer deep discounts on “spot” instances, VPSes or cloud servers that can be reclaimed at any time. These are perfect for bursty workloads, short-term batch jobs, or backup processing where uptime isn’t mission-critical. Providers like Oracle Cloud and even some on the LowEndBox VPS deals page offer cost-effective servers that can be used this way. 2. Consolidate with Docker or Lightweight VMs Instead of spinning up multiple VPS instances, try consolidating services using containers or lightweight VMs (like those on Proxmox, LXC, or KVM). You’ll pay for fewer VPSes and get better performance by optimizing your resources. Tools like Docker Compose or Portainer make it easy to manage your stack efficiently. 3. Deploy to Cheaper Regions Server pricing often varies based on data center location. Consider moving your workloads to lower-cost regions like Eastern Europe, Southeast Asia, or Midwest US cities. Just make sure latency still meets your needs. LowEndBox regularly features hosts offering ultra-affordable plans in these locations. 4. Pay Annually When It Makes Sense Some providers offer steep discounts for annual or multi-year plans, sometimes as much as 30–50% compared to monthly billing. If your project is long-term, this can be a great way to save. Before you commit, check if the provider is reputable. User reviews on LowEndTalk can help you make a smart call. 5. Take Advantage of Free Tiers You’d be surprised how far you can go on free infrastructure these days. Services like: Cloudflare Tunnels (free remote access to local servers) Oracle Cloud Free Tier (includes 4 vCPUs and 24GB RAM!) GitHub Actions for automation Hetzner’s free DNS or Backblaze’s generous free storage Combined with a $3–$5 VPS, these tools can power an entire workflow on a shoestring budget. 6. Monitor Idle Resources It’s easy to let unused servers pile up. Get into the habit of monitoring resource usage and cleaning house monthly. If a VPS is sitting idle, shut it down or consolidate it. Tools like Netdata, Grafana + Prometheus, or even htop and ncdu can help you track usage and trim the fat. 7. Watch LowEndBox for Deals (Seriously) This isn’t just self-promo, it’s reality, LowEndBox has been the global market leader in broadcasting great deals for our readers for years. Our team at LowEndBox digs up exclusive discounts, coupon codes, and budget-friendly hosting options from around the world every week. Whether it’s a $15/year NAT VPS, or a powerful GPU server for AI workloads under $70/month, we help you find the right provider at the right price. Bonus: we also post guides and how-tos to help you squeeze the most out of your stack. Final Thoughts Cutting costs doesn’t mean sacrificing quality. With the right mix of smart planning, efficient tooling, and a bit of deal hunting, you can run powerful, scalable infrastructure on a micro-budget. Got your own cost-saving tip? Share it with the community over at LowEndTalk! https://lowendbox.com/blog/1-vps-1-usd-vps-per-month/ https://lowendbox.com/blog/2-usd-vps-cheap-vps-under-2-month/ https://lowendbox.com/best-cheap-vps-hosting-updated-2020/ Read the full article

[rishabhtpt]

Mastering Docker: A Complete Guide for Beginners

Docker has revolutionized the way developers build, package, and deploy applications. It simplifies software deployment by allowing applications to run in isolated environments called containers. This Docker tutorial will provide beginners with a complete understanding of Docker, how it works, and how to use it effectively.

What is Docker?

Docker is an open-source platform designed to automate the deployment of applications inside lightweight, portable containers. It ensures that applications run consistently across different computing environments.

Key Features of Docker:

Portability: Containers work across different platforms without modification.

Efficiency: Containers share the host OS kernel, reducing resource consumption.

Scalability: Easy to scale applications up or down based on demand.

Isolation: Each container runs in its own isolated environment.

Why Use Docker?

Before Docker, applications were often deployed using virtual machines (VMs), which were resource-intensive. Docker provides a more lightweight and efficient alternative by using containerization.

Benefits of Docker:

Faster Deployment: Containers launch within seconds.

Consistency: Works the same on different systems, eliminating “it works on my machine” issues.

Better Resource Utilization: Uses fewer resources than traditional VMs.

Simplified Dependency Management: All dependencies are packaged within the container.

Installing Docker

To start using Docker, you need to install it on your system. Follow these steps based on your OS:

Windows & macOS:

Download Docker Desktop from Docker’s official website.

Install Docker and restart your system.

Verify installation by running:

docker --version

Linux:

Update the package database:

sudo apt update

Install Docker:

sudo apt install docker.io -y

Start the Docker service:

sudo systemctl start docker

sudo systemctl enable docker

Verify installation:

docker --version

Understanding Docker Components

Docker consists of several core components that help in container management.

1. Docker Engine

The runtime that builds and runs containers.

2. Docker Images

A Docker Image is a blueprint for creating containers. It contains the application code, dependencies, and configurations.

3. Docker Containers

A Docker Container is a running instance of an image. It runs in an isolated environment.

4. Docker Hub

A cloud-based registry where Docker images are stored and shared.

Basic Docker Commands

Here are some essential Docker commands to help you get started:

1. Check Docker Version

docker --version

2. Pull an Image from Docker Hub

docker pull ubuntu

3. List Available Images

docker images

4. Run a Container

docker run -it ubuntu bash

This command runs an Ubuntu container and opens an interactive shell.

5. List Running Containers

docker ps

6. Stop a Running Container

docker stop <container_id>

7. Remove a Container

docker rm <container_id>

8. Remove an Image

docker rmi ubuntu

Creating a Docker Container from a Custom Image

To create a custom container, follow these steps:

1. Create a Dockerfile

A Dockerfile is a script containing instructions to build an image.

Create a Dockerfile with the following content:

# Use an official Python runtime as a parent image

FROM python:3.9

# Set the working directory

WORKDIR /app

# Copy the current directory contents into the container at /app

COPY . /app

# Install any dependencies

RUN pip install --no-cache-dir -r requirements.txt

# Run the application

CMD ["python", "app.py"]

2. Build the Docker Image

Run the following command:

docker build -t my-python-app .

3. Run a Container from the Image

docker run -p 5000:5000 my-python-app

Managing Data with Docker Volumes

Docker volumes are used for persistent storage. To create and use a volume:

Create a volume:

docker volume create my_volume

Attach it to a container:

docker run -v my_volume:/app/data ubuntu

Check available volumes:

docker volume ls

Docker Compose: Managing Multi-Container Applications

Docker Compose is a tool used to define and manage multi-container applications.

Example docker-compose.yml:

version: '3'

services:

  web:

    image: nginx

    ports:

      - "8080:80"

  db:

    image: mysql

    environment:

      MYSQL_ROOT_PASSWORD: password

To start the services, run:

docker-compose up

Best Practices for Using Docker

Use Official Images: Minimize security risks by using verified images from Docker Hub.

Minimize Image Size: Use lightweight base images like alpine.

Keep Containers Stateless: Store persistent data in volumes.

Remove Unused Containers and Images: Clean up using:

docker system prune -a

Limit Container Resources: Use flags like --memory and --cpu-shares to allocate resources efficiently.

Conclusion

Docker is an essential tool for modern software development, enabling efficient and scalable application deployment. This Docker tutorial For beginner covered the basics, from installation to container management and best practices. Whether you are new to containerization or looking to refine your skills, mastering Docker will significantly improve your workflow.

Start experimenting with Docker today and take your development process to the next level!

[codezup]

Dockerizing Flask: A Comprehensive Guide to Containerization

1. Introduction 1.1 Brief Explanation Dockerizing Flask refers to the process of containerizing a Flask web application using Docker, enabling easy deployment, scaling, and management in various environments. This guide provides a hands-on approach to containerizing Flask applications. 1.2 What Readers Will Learn Create Docker images for Flask applications. Use Docker Compose for…

[virtualizationhowto]

Graylog Docker Compose Setup: An Open Source Syslog Server for Home Labs

Graylog Docker Compose Install: Open Source Syslog Server for Home #homelab GraylogInstallationGuide #DockerComposeOnUbuntu #GraylogRESTAPI #ElasticsearchAndGraylog #MongoDBWithGraylog #DockerComposeYmlConfiguration #GraylogDockerImage #Graylogdata

A really great open-source log management platform for both production and home lab environments is Graylog. Using Docker Compose, you can quickly launch and configure Graylog for a production or home lab Syslog. Using Docker Compose, you can create and configure all the containers needed, such as OpenSearch and MongoDB. Let’s look at this process. Table of contentsWhat is Graylog?Advantages of…

[teguhteja]

Simplifying Docker Networking: A Tutorial on Using Static IPs with Odoo and PostgreSQL

Master Docker networking with our latest guide on setting static IPs! Discover how DockerStaticIP can streamline your Odoo and PostgreSQL setup. #DockerNetworking

Debug Odoo 17 in Docker Using VSCodeIn this tutorial, we’ll explore the benefits and implementation of static IP addresses in Docker, focusing on a practical example with Odoo and PostgreSQL. Static IPs can greatly enhance the reliability and manageability of containerized applications. Let’s dive into how to configure static IPs in a Docker Compose setup for an efficient Odoo…

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Managing Secrets in Docker Compose – A Developer's Guide

https://phase.dev/blog/docker-compose-secrets/

[learning-code-ficusoft]

A Beginner’s Guide to Docker: Building and Running Containers in DevOps

Docker has revolutionized the way applications are built, shipped, and run in the world of DevOps. As a containerization platform, Docker enables developers to package applications and their dependencies into lightweight, portable containers, ensuring consistency across environments. This guide introduces Docker’s core concepts and practical steps to get started.

What is Docker? Docker is an open-source platform that allows developers to: Build and package applications along with their dependencies into containers. 

Run these containers consistently across different environments. Simplify software development, deployment, and scaling processes.

 2. Why Use Docker in DevOps? Environment Consistency: Docker containers ensure that applications run the same in development, testing, and production. 

Speed: Containers start quickly and use system resources efficiently. 

Portability: Containers can run on any system that supports Docker, whether it’s a developer’s laptop, an on-premises server, or the cloud. 

Microservices Architecture: Docker works seamlessly with microservices, enabling developers to build, deploy, and scale individual services independently. 

3. Key Docker Components Docker Engine:

 The core runtime for building and running containers.

 Images: A blueprint for containers that include the application and its dependencies. Containers: Instances of images that are lightweight and isolated. 

Dockerfile: A script containing instructions to build a Docker image. 

Docker Hub: A repository for sharing Docker images. 

4. Getting Started with Docker

 Step 1: Install Docker Download and install Docker Desktop for your operating system from Docker’s official site.

Step 2: Write a Dockerfile Create a Dockerfile to define your application environment. 

Example for a Python app: 

dockerfile Edit 

# Use an official Python runtime as a base image FROM python:3.9-slim 

# Set the working directory WORKDIR /app 

# Copy project files COPY . .

# Install dependencies RUN pip install -r requirements.txt # Define the command to run the app CMD [“python”, “app.py”] 

Step 3: Build the Docker Image Run the following command to build the image:

 bash Copy Edit docker build -t my-python-app . 

Step 4: Run the Container Start a container from your image: 

bash

Edit docker run -d -p 5000:5000 my-python-app

 This maps port 5000 of the container to port 5000 on your host machine.

 Step 5: Push to Docker Hub Share your image by pushing it to Docker Hub: bash 

Edit docker tag my-python-app username/my-python-app docker push username/my-python-app

 5. Practical Use Cases in DevOps Continuous Integration/Continuous Deployment (CI/CD): 

Docker is commonly used in pipelines for building, testing, and deploying applications. 

Microservices:

 Each service runs in its own container, isolated from others. 

Scalability: 

Containers can be easily scaled up or down based on demand. 

Testing: 

Test environments can be quickly spun up and torn down using Docker containers. 

6. Best Practices Keep Docker images small by using minimal base images. Avoid hardcoding sensitive data into images; use environment variables instead. 

Use Docker Compose to manage multi-container applications. Regularly scan images for vulnerabilities using Docker’s built-in security tools. 

Conclusion 

Docker simplifies the development and deployment process, making it a cornerstone of modern DevOps practices. By understanding its basics and starting with small projects, beginners can quickly leverage Docker to enhance productivity and streamline workflows.