Docker Practice

會用 Linux 架網站，就一定能學會 docker。

因為 docker 只是把架站過程 拆解 與 抽象化 而已。

Run a php script file

Dockerfile

FROM php:7.4-cli
COPY . /usr/src/myapp
WORKDIR /usr/src/myapp
CMD [ "php", "./index.php" ]

index.php

<?php

echo "Hello from the docker container";

cmd

$ docker build -t my-php-app .
$ docker run -it --rm --name my-running-app my-php-app

• want to know what's the OS? find it on docker hub description

  • https://github.com/docker-library/php/blob/47e681a74116da5a99e804bef5a7808df40d831f/7.4/buster/cli/Dockerfile
  • all the instructions are there
  • 精神都已經是拆解抽象化了，只要確認 Dockerfile 環境能成功執行當前任務即可
  • 所以通常也不需要去看 base image 內容. 抽象化就是這樣.

• want to observe the image layers? find it on docker hub tags

  • https://hub.docker.com/layers/php/library/php/7.4-cli/images/sha256-4e48be5c1b8885e910ea05903daf5bfe6a0b23e7ea2aadfbc2bc2a02836257b7?context=explore

cmd for running script without Dockerfile

docker run -it --rm -v "$PWD":/usr/src/myapp -w /usr/src/myapp php:7.4-cli php index.php

• -v 就是 --volume 就是 VOLUME.
• 那個冒號就是，把當前 host folder 給 mount 到某個 container folder
• /usr/src 有在 Dockerfile 裡面產生過. 反正就找個路徑放 source code 而已.
• https://github.com/docker-library/php/blob/47e681a74116da5a99e804bef5a7808df40d831f/7.4/buster/cli/Dockerfile
• -w 就是 --workdir 就是 WORKDIR. 就跟 cd 進去準備工作差不多意思.

---

Run a php file with the built-in server to show web page

cmd

docker run -it -v "$PWD":/usr/src/myapp -w /usr/src/myapp -p 8080 php:7.4-cli php -S 0.0.0.0:8080

cmd to see what is the working port

docker ps

• will see this 0.0.0.0:32770->8080/tcp

open browser with all of these, all works

http://0.0.0.0:32770/
http://localhost:32770/
http://127.0.0.1:32770/

• 32770 is just a random valid port found by docker. assign the port manually is better

docker run -it -v "$PWD":/usr/src/myapp -w /usr/src/myapp -p 8080:8080 php:7.4-cli php -S 0.0.0.0:8080

---

Run a php + apache site to show web page

Dockerfile

FROM php:7.4-apache
COPY . /var/www/html/

index.php

<?php

echo "<h1>This web page is from docker.</h1>";

cmd

docker build -t my-php-app .
docker run -p 8080:80 my-php-app

cmd to run without Dockerfile

docker run -p 8080:80 -v "$PWD":/var/www/html php:7.4-apache

---

Run a mysql client app

docker-compose.yml

# Use root/example as user/password credentials
version: '3.1'

services:

  db:
    image: mysql
    command: --default-authentication-plugin=mysql_native_password
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: example

  adminer:
    image: adminer
    restart: always
    ports:
      - 8080:8080

cmd

docker-compose up

• the mysql Dockerfile is here
  • you can see the 3306 is exposed as 33060 in the file -> No. this is wrong.
  • it means the container exposes 3306 and 33060. two ports are exposed.
• the adminer Dockerfile is here
  • default talk to mysql via port 3306 or maybe 33060.

---

Run a php + apache + mysql site to show web page

Dockerfile

FROM php:7.4-apache
RUN docker-php-ext-install mysqli

docker-compose.yml

# Use user/test as user/password credentials
version: "3.1"

services:

  www:
    build: .
    ports:
      - "8080:80"
    volumes:
      - .:/var/www/html/
    links:
      - db

  db:
    image: mysql:8.0
    ports:
      - "3306:3306"
    command: --default-authentication-plugin=mysql_native_password
    volumes:
      # remember to create the `mysql-data` folder in the current path
      - ./mysql-data:/var/lib/mysql
    environment:
      MYSQL_DATABASE: myDb
      MYSQL_USER: user
      MYSQL_PASSWORD: test
      MYSQL_ROOT_PASSWORD: test

index.php

<?php

echo "<h1>This web page is from docker LAMP.</h1>";

echo "<hr>";

$dbname = 'myDb';
$dbuser = 'user';
$dbpass = 'test';
$dbhost = 'db';

$connect = mysqli_connect($dbhost, $dbuser, $dbpass)
    or die("Unable to Connect to '$dbhost'");

mysqli_select_db($connect, $dbname) or die("Could not open the db '$dbname'");

mysqli_query($connect, "CREATE TABLE Persons (PersonID int, LastName varchar(255), FirstName varchar(255), Address varchar(255), City varchar(255));");

$test_query = "SHOW TABLES FROM $dbname";
$result = mysqli_query($connect, $test_query);

$tblCnt = 0;
while($tbl = mysqli_fetch_array($result)) {
    $tblCnt++;
    echo $tbl[0]."<br />\n";
}

if (!$tblCnt) {
    echo "There are no tables<br />\n";
} else {
    echo "There are $tblCnt tables<br />\n";
}

---

Run a Laravel + apache + ubuntu + mysql site

• oh no, it's too much hassle
• https://dev.to/veevidify/docker-compose-up-your-entire-laravel-apache-mysql-development-environment-45ea
• i will just use Sail or Laradock or other existing settings for now.

---

Run a phpmyadmin service to administrate the above site

• just add another new service in the docker-compose.yml should be fine
• https://hub.docker.com/r/phpmyadmin/phpmyadmin/
• https://hub.docker.com/_/adminer/

---

Understand Laradock

in the app repo

git submodule add https://github.com/Laradock/laradock.git

so the file structure would be

* project-a
*   laradock-a
* project-b
*   laradock-b

launch the server & database

docker-compose up -d nginx mysql

enter the terminal in the container

docker-compose exec workspace bash

• 這個 docker-compose.yml 內容有點龐大呀...
• https://github.com/laradock/laradock/blob/master/docker-compose.yml

---

Understand Vessel

• vessel 是用 composer 安裝的，所以需要在電腦上準備好可以跑 composer 的環境

composer require shipping-docker/vessel
php artisan vendor:publish --provider="Vessel\VesselServiceProvider"

# Run this once to initialize project
# Must run with "bash" until initialized
bash vessel init

./vessel start

• 這個 docker-compose.yml 內容親切多了
• https://github.com/shipping-docker/vessel/blob/master/docker-files/docker-compose.yml
• 不過我是沒有成功裝起來. 差一點點. 懶得裝完.
• 然後 composer require 沒有加上 --dev 有點怪啦.

Understand Sail

• legacy laravel 裝不起來. php 版本那些有衝突
• https://github.com/laravel/sail/blob/1.x/composer.json
• 用在最新的 larvel 上吧
• 作業系統倒是不用很新. 也不用新到 php8. 使用 php7.3 夠跑第一次的 sail 即可.
• 還有 php7.3 相關的 php extension 那些要裝. 不難.
• 之後都會透過 sail 在 docker 裡面跑. composer package 環境版本就完全不用管了.

install laravel 8.0

curl -s https://laravel.build/example-app | bash

launch the docker

cd example-app

./vendor/bin/sail up

more

sail up -d
sail down
sail artisan queue:work
sail php --version
sail php script.php
sail composer require laravel/sanctum
sail node --version
sail npm run prod
sail test
sail artisan test

• 應該是方便開發而已. 正式環境先別使用吧.
• 之後 laravel8 的快速安裝與啟用本機開發環境，真的是神速了.

to make sure the database is ready

./vendor/bin/sail artisan migrate

play more, enable the auth feature

./vendor/bin/sail composer require laravel/breeze --dev
./vendor/bin/sail artisan breeze:install
./vendor/bin/sail npm install
./vendor/bin/sail npm run dev