This is a collection of some Docker statements. Mainly for myself to copy-paste and save time. copy-paste-meme

1. Docker file template with MySQL and adminer

In your root directory, create following files

.
├── scripts/
│   ├── schema.sql
│   ├── data.sql
│   └── mycustom.cnf
└── docker-compose.yml

Edit yourdocker-compose.yml as follows

version: "3.8"
services:
db:
 image: mysql:8.0.33
 container_name: mysql8.0.33
 restart: always
 environment:
   MYSQL_ROOT_PASSWORD: secret
   MYSQL_DATABASE: playground
 volumes:
   - "./scripts/schema.sql:/docker-entrypoint-initdb.d/1.sql"
   - "./scripts/data.sql:/docker-entrypoint-initdb.d/2.sql"
   - "./scripts/mycustom.cnf:/etc/mysql/conf.d/custom.cnf"
 ports:
   - 3306:3306

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

You can add your initial database schema in scripts/schema.sql

CREATE TABLE `test` (
`id` int unsigned NOT NULL AUTO_INCREMENT,
`name` varchar(32) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

You can add your initial data in scripts/data.sql
```
INSERT INTO test (name)
VALUES ("Dennis");
```
Run your docker file with docker-compose
```
docker-compose up
```
Open your browser at localhost:8080, login to your MySQL instance and have fun.

2. Exploring the docker filesystem

docker exec -t -i <container_name> /bin/bash

-t (terminal): This option allows you to interact with the container using a terminal-like interface. It is commonly used when you need to run interactive commands inside the container, such as an interactive shell session.
-i (interactive): This option enables you to provide input to the command running inside the container.

3. Connect to mysql via command line

docker exec -t -i <container_name> mysql -u my_user -p

4. Copy a file from docker container to host machine

docker cp <container-id>:/file/path/within/container /host/file/path/target

5. Publish docker image to Docker Hub

When you login to your Docker Hub, you will see the default command how to push a image to your docker hub. For example
```
docker push dcnis/popup-chinese-backend-quarkus:tagname
```
If you would execute this command locally, you will probably get an error which says docker cannot find the image with the tag dcnis/popup-chinese-backend-quarkus. So first we have to create a new tag.
List docker images
```
docker images
quarkus/popup-chinese-backend-quarkus
```
We can see we have one images with the name quarkus/popup-chinese-backend-quarkus. Based on this image, we create the new tag.

Create a new tag from your existing docker image.

docker tag quarkus/popup-chinese-backend-quarkus dcnis/popup-chinese-backend-quarkus

Check the images

docker images
quarkus/popup-chinese-backend-quarkus                 latest
dcnis/popup-chinese-backend-quarkus                 latest

Push the image

% docker push dcnis/popup-chinese-backend-quarkus
Using default tag: latest
The push refers to repository [docker.io/dcnis/popup-chinese-backend-quarkus]
48efe9a978d6: Pushed 
5f77935eec15: Pushed 
3b6ba2682483: Pushed 
129f98c51b7a: Pushed 
41c90dc5a18e: Pushed 
5f70bf18a086: Pushed 
5282f3464e78: Pushed 
latest: digest: sha256:0baf3b80fdc4ea7fd73f199f88d8c91099e3191ca8705dd0e79d68dd67013d01 size: 1780

Continuous workflow: To speed up your development process, you can create the image directly with the correct name and then push the new image to Docker Hub.
```
% docker build -f src/main/docker/Dockerfile.native-micro -t dcnis/popup-chinese-backend-quarkus .
% docker push dcnis/popup-chinese-backend-quarkus
```

6. Spin up PostgreSQL Database with Docker

docker run --name postgresql -p 5432:5432 -e POSTGRES_PASSWORD=postgres -d postgres

My Docker Cheat Sheet