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technical:docker-intro [2026/09/11 19:21] – systemtechnical:docker-intro [2026/09/13 20:12] (current) – [3 types you'll see:] system
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   - **Bind mount** ./mycode:/app - you link your local folder to container. Great for development, edit code locally, container sees it instantly.   - **Bind mount** ./mycode:/app - you link your local folder to container. Great for development, edit code locally, container sees it instantly.
   - **Anonymous volume** - Docker creates random name, don't use it.   - **Anonymous volume** - Docker creates random name, don't use it.
 +
 +<WRAP center round tip 100%>
 +  * The left side is on the host side
 +  * The right side is on the container side.
 +</WRAP>
 +
  
 ===== Short Recap ===== ===== Short Recap =====
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   * **Dockerfile** = instructions for how to build one brick type — what clay, how hot, how long in oven.   * **Dockerfile** = instructions for how to build one brick type — what clay, how hot, how long in oven.
   * **docker-compose.yml** = architectural plan — where bricks go, where plumbing and electrical go, how 3 houses connect into a neighborhood.   * **docker-compose.yml** = architectural plan — where bricks go, where plumbing and electrical go, how 3 houses connect into a neighborhood.
 +
 +==== When to use what: ====
 +  * You write a Dockerfile once per app/service you create.
 +  * You write a docker-compose.yml once per project to run all your services together locally.
 +
 +You can use Dockerfile without compose:
 +  * docker build + docker run
 +You cannot use compose without images — either you build them via Dockerfile, or pull them from Hub.
 +  * In short:
 +      * **Dockerfile** -> //docker build// -> Image
 +      * **docker-compose.yml** -> //docker compose up// -> Running containers (built from Dockerfiles or Hub images)
 +
 +
 +===== Networking with Docker =====
 +  * Because networking is usually hands-on, we will cover the Docker networking in the pages which will do hands on exercises. 
 +<WRAP center round tip 100%>
 +  * Network can be specified when you issue the //docker run// command
 +  * Alternatively it can be specified in the docker-compose.yml file and then you issue the //docker compose up// command.
 +</WRAP>
  
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