Detailed process of getting started with docker compose helloworld

Prerequisites

Compose is a tool for orchestrating Docker containers. It is a powerful tool for integrating and publishing Docker applications. It can define and run multi-container applications. In Compose, you can use YAML files to configure your application services. Then, with just one simple command, all the services you configured are created and started.

Docker-compose is based on Docker, so we need to install Docker before we can use Docker-compose.

Using Compose basically involves the following three steps:

Define your application environment in Dockerfile, which can be multiple docker applications.
Define the services that make up your application in docker-compose.yml.
Run the entire application solution using the docker-compose up command.

Reference URL:

Docker installation

• Uninstall old versions

sudo yum remove docker \
                docker-client \
                docker-client-latest \
                docker-common \
                docker-latest \
                docker-latest-logrotate \
              docker-logrotate \
                docker-engine

• Install Docker Engine-Community

sudo yum install -y yum-utils device-mapper-persistent-data lvm2

sudo yum-config-manager \
  --add-repo \
  http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

sudo yum install docker-ce docker-ce-cli containerd.io

• Start Docker

sudo systemctl start docker

• Install the plugin

yum install https://download.docker.com/linux/fedora/30/x86_64/stable/Packages/containerd.io-1.2.6-3.3.fc30.x86_64.rpm

• Test whether Docker is installed successfully

docker --version

到此docker安裝完成!!!

docker-compose installation

The official website download address may be slow, it is recommended to use the following

• Download and install

curl -L https://get.daocloud.io/docker/compose/releases/download/1.26.2/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose

• Authorization (must be authorized, responsible for not having authority)

chmod +x /usr/local/bin/docker-compose

• Verify that docker-compose is installed successfully (check the version)

docker-compose version 

到此docker-compose 安裝成功!!!

Getting Started with Docker Compose

Generate mysql and redis containers through docker-compose

1. Create a project directory and enter

$ mkdir composetest
$ cd composetest

2. Create a docker-compose.yml file and put it in the project directory

The specific contents of the file are as follows:

version: "3.0"
services:
  mysqldb:
    image:mysql:5.7.19
    container_name: mysql
    ports:
      - "3306:3306"
    volumes:
      - /root/mysql/conf:/etc/mysql/conf.d
      - /root/mysql/logs:/logs
      - /root/mysql/data:/var/lib/mysql
    environment:
      MYSQL_ROOT_PASSWORD: root
    networks:
      -ems
    depends_on:
      - redis

  redis:
    image: redis:4.0.14
    container_name: redis
    ports:
      - "6379:6379"
    networks:
      -ems
    volumes:
      - /root/redis/data:/data
    command: redis-server
    
networks:
  ems:

3. Start

Start in current folder

• Front desk startup

docker-compose up

• Background startup

docker-compose up -d

The output log is as follows

Check whether the container in Docker is available

Check whether the container is generated

Test whether the redis container is available

Test whether the mysql container is available

到此入門案例已經完成!!!

Summarize

1. The docker-compose command cannot be executed because of a permission issue. We need to open permissions and execute the following command

chmod +x /usr/local/bin/docker-compose

2. During the study period, we can use docker-compose in the virtual machine to build our basic hardware facilities, which is very convenient and saves a lot of time in configuring the environment and installing basic services.

3. Docker-compose still needs to be learned

Reference URL:

https://mp.weixin.qq.com/s/KXUm2ydAgymaNzHDiMlg0g

The pitfall of insufficient permissions

https://blog.csdn.net/weixin_41598660/article/details/104034179

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