5 Common Mistakes When Writing Docker Compose

When building a containerized application, developers need a way to boot containers they’re working on to test their code. While there are several ways to do this, Docker Compose is one of the most popular options. It makes it easy to:

Specify what containers to boot during development
And setup a fast code-test-debug development loop

The vision is that someone writes a docker-compose.yml that specifies everything that’s needed in development and commits it to their repo. Then, every developer simply runs docker-compose up, which boots all the containers they need to test their code.

However, it takes a lot of work to get your docker-compose setup to peak performance. We’ve seen the best teams booting their development environments in less than a minute and testing each change in seconds.

Given how much time every developer spends testing their code every day, small improvements can add up to a massive impact on developer productivity.

#docker #docker development

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5 Common Mistakes When Writing Docker Compose

Iliana Welch

1595249460

Docker Explained: Docker Architecture | Docker Registries

Following the second video about Docker basics, in this video, I explain Docker architecture and explain the different building blocks of the docker engine; docker client, API, Docker Daemon. I also explain what a docker registry is and I finish the video with a demo explaining and illustrating how to use Docker hub

In this video lesson you will learn:

What is Docker Host
What is Docker Engine
Learn about Docker Architecture
Learn about Docker client and Docker Daemon
Docker Hub and Registries
Simple demo to understand using images from registries

#docker #docker hub #docker host #docker engine #docker architecture #api

Alex Tyler

1594368886

5 Common Mistakes When Writing Docker Compose

When building a containerized application, developers need a way to boot containers they’re working on to test their code. While there are several ways to do this, Docker Compose is one of the most popular options. It makes it easy to:

Specify what containers to boot during development
And setup a fast code-test-debug development loop

The vision is that someone writes a docker-compose.yml that specifies everything that’s needed in development and commits it to their repo. Then, every developer simply runs docker-compose up, which boots all the containers they need to test their code.

However, it takes a lot of work to get your docker-compose setup to peak performance. We’ve seen the best teams booting their development environments in less than a minute and testing each change in seconds.

Given how much time every developer spends testing their code every day, small improvements can add up to a massive impact on developer productivity.

#docker #docker development

August Murray

1615008840

Top 24 Docker Commands Explained with Examples

In my previous blog post, I have explained in detail how you can Install Docker and Docker-compose on Ubuntu

In this guide, I have explained the Top 24 Docker Commands with examples.

Make sure you have sudo or root privileges to the system.

Docker Commands

The command to check the version of Docker installed.
To look/search for available docker images from the Docker registry.
To pull docker images from the Docker registry.
Listing all the docker images
Creating / Running docker container from Docker image.
To list the actively running docker containers.
To list all the docker containers
To stop a Container
To start a Container
To restart a Docker container
To login to running Docker container
To delete the stopped Docker containers
To delete Docker images from the Local system
To check logs of a running Docker container
Killing docker containers
Log in to Docker Hub registry (hub.docker.com)
Removing docker hub registry login from the system.
Check active resource usage by each containers
Rename a Docker container
To display system wide information of Docker
Inspecting a Docker container
Building docker images from Docker file
Creating new docker images from a Container
Pushing Docker images from Local to Docker registry.

#docker #docker-command #containers #docker-compose #docker-image

Loma Baumbach

1600358785

Deploy a Tomcat Application Using Docker-Compose

In this blog, we will learn what is docker-compose and how we can deploy a tomcat application which uses mysql database. We will learn how we can setup a development environment using docker-compose in a single command

Prerequisite:

Docker and Docker-compose installed

INTRODUCTION

Docker-compose is a tool which is used to deploy multi-container application.
One single yaml file to deploy your application on the server.
Best suited for the developers to setup their workstation in a single command without installing any kind of dependencies for the application
docker-compose up to start your application
docker-compose down to clean up all the docker containers

Let’s take an example here:

We have a project called user registration which uses mysql for storing the data . In terms of microservices, we can say that we have two services as shown below:

Web Service
Database Service

You can clone this git repo and try the below example

Explanation of docker-compose

**version : **This is the version as per the docker engine you have installed on your machine
**services: **This is the main tag which is used to configure multiple services and under that we have details of all the services

3. web: This is our service name -> using image, ports and volumes

4. **volumes: **To store the database files

Now we will create main docker-compose file which will together launch a tomcat, mysql and phpmyadmin container

Tomcat container — To run your application

**Database container **— To store the data

PhpMyAdmin — Access the database through GUI

So we will have three services

db — we are using local path to store the data so that when you run docker-compose down all your data will retain. If you use the volume then all data will get lost if you run the docker-compose down

Also, we are importing sql file so that our database is ready with the sample data. It is good so that each developer will always have the base or the actual data to run their application on the local machine

2. phpmyadmin — which is used to access the database through GUI and it depends on service db

3. web — which is used to access your web application and it also depends on service db

version: '3.3'
services:
   db:
     image: mysql:5.7
     volumes:
       - /opt/test:/var/lib/mysql
       - ./mysql-dump:/docker-entrypoint-initdb.d
     environment:
       MYSQL_ROOT_PASSWORD: root
       MYSQL_DATABASE: testdb1
       MYSQL_USER: testuser
       MYSQL_PASSWORD: root
     ports:
       - 3306:3306
phpmyadmin:
    depends_on:
      - db
    image: phpmyadmin/phpmyadmin
    ports:
      - '8081:80'
    environment:
      PMA_HOST: db
      MYSQL_ROOT_PASSWORD: root
web:
    depends_on:
      - db
    image: tomcat
    volumes:
      - ./target/LoginWebApp-1.war:/usr/local/tomcat/webapps/LoginWebApp-1.war
    ports:
      - '8082:8080'
    environment:
      MYSQL_ROOT_PASSWORD: root
      MYSQL_DATABASE: testdb1
      MYSQL_USER: testuser
      MYSQL_PASSWORD: root

#docker-compose #docker-image #docker

Roosevelt Hettinger

1596766140

Cómo instalar Drupal con Docker Compose

Введение

Docker позволяет легко помещать приложения и службы в контейнеры, чтобы их можно было запускать где угодно. Однако при работе с Docker можно легко накопить чрезмерное количество неиспользуемых образов, контейнеров и томов данных, замедляющих работу и потребляющих место на диске.

Docker предоставляет все необходимые инструменты для очистки системы из командной строки. В этом руководстве с полезными советами кратко описываются полезные команды для освобождения места на диске и организации системы посредством удаления неиспользуемых образов, контейнеров и томов Docker.

Использование этого руководства:

Это руководство в формате полезных советов содержит автономные сниппеты для командной строки
Вы можете перейти к любому разделу, актуальному для задачи, которую вы пытаетесь выполнить.

Синтаксис замены команды command $(``command``), используемый в командах, доступен во многих популярных оболочках, включая bash, zsh и Windows Powershell.

Очистка всех неиспользуемых или не связанных с контейнерами образов, контейнеров, томов и сетей

В Docker имеется команда, очищающая все не связанные с контейнерами ресурсы, в том числе образы, контейнеры, тома и сети:

docker system prune

Чтобы удалить все остановленные контейнеры и неиспользуемые образы (а не только образы, не связанные с контейнерами), добавьте в эту команду флаг -a:

docker system prune -a

Удаление образов Docker

Удаление одного или нескольких конкретных образов

Используйте команду docker images с флагом -a, чтобы найти идентификатор удаляемых образов. Эта команда покажет вам все образы, включая промежуточные слои образов. Когда вы определитесь с составом удаляемых образов, вы можете передать их идентификаторы или теги в docker rmi:

Список:

docker images -a

Удаление:

docker rmi Image Image

Удаление образов, не привязанных к контейнеру

Образы Docker состоят из нескольких слоев. Несвязанные образы — это слои, не имеющие связей с каким-либо образами с тегами. У них нет никакого назначения, и они просто занимают место на диске. Их можно найти, добавив флаг фильтра -f со значением dangling=true в команду docker images. Если вы уверены, что хотите удалить их, вы можете использовать команду docker images purge:

#drupal #docker #docker compose #docker images