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Mohammed NaserMohammed Naser
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add Docker section and fix images problem
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‎.obsidian/app.json‎

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{}
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"alwaysUpdateLinks": true
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‎.obsidian/workspace.json‎

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{
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"id": "b4feec1ef5f76a77",
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"type": "leaf",
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"file": "imgs/DevOps/Docker/about-dockerworking.jpg"
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"icon": "lucide-image",
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"title": "about-dockerworking"
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"file": "imgs/DevOps/Docker/Containers_VirtualMachines.png"
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"title": "Containers_VirtualMachines"
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"file": "imgs/DevOps/Docker/meme.jpeg"
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"icon": "lucide-image",
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"title": "meme"
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"id": "39f808fb8e3166fa",
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"file": "imgs/DevOps/Docker/about-dockerworking.jpg"
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"icon": "lucide-image",
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"title": "about-dockerworking"
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"file": "imgs/DevOps/Docker/docker-user-defined-bridge-network.png"
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"icon": "lucide-image",
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"title": "docker-user-defined-bridge-network"
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"title": "index"
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‎DevOps/Docker/docker-compose.md‎

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- /app/node_modules # Mounts the /app/node_modules directory in the container. (Anonymous volume)
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```
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![docker-compose](./imgs/docker-compose-example.png)
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![docker-compose](/imgs/DevOps/Docker/docker-compose-example.png)
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Notice that the name of the image is `nodeapp-express-node-app`. This is because the `build` key in the `docker-compose.yml` file uses the current directory name with the service name to name the image.
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‎DevOps/Docker/docker-environment-variables.md‎

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```bash
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docker run --name express-node-app-container -v "$(pwd)":/app -v /app/node_modules --env PORT=4000 --env NODE_ENV=development -d -p 4000:4000 express-node-app
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```
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![Example](./imgs/docker-environment-variables.png)
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![Example](/imgs/DevOps/Docker/docker-environment-variables.png)
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In the above example, we are passing the `PORT` and `NODE_ENV` environment variables to the `express-node-app` container.
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docker run --name express-node-app-container -v "$(pwd)":/app -v /app/node_modules --env-file .env -d -p 4000:4000 express-node-app
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```
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![Example](./imgs/docker-environment-variables-file.png)
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![Example](/imgs/DevOps/Docker/docker-environment-variables-file.png)
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-------------------------
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In this example, the `environment` section is used to set the `PORT` and `NODE_ENV` environment variables for the `express-node-app` service.
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![Example](./imgs/docker-environment-variables-compose.png)
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![Example](/imgs/DevOps/Docker/docker-environment-variables-compose.png)
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env_file:
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- .env
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```
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![Example](./imgs/docker-environment-variables-compose-file.png)
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![Example](/imgs/DevOps/Docker/docker-environment-variables-compose-file.png)
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In this example, the `.env` file is used to set the environment variables for the `express-node-app` service.
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‎DevOps/Docker/docker-file.md‎

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- `npm install` installs all the dependencies listed in the `package.json` file. If the `package.json` file has not changed since the last build, Docker will use the cached layer for that step and not execute the `npm install` command again. This speeds up the build process.
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![Docker Cache Mechanism](./imgs/docker-cache-mechanism.png)
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![Docker Cache Mechanism](/imgs/DevOps/Docker/docker-cache-mechanism.png)
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------------------------------------------------------------
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‎DevOps/Docker/docker-hot-reload.md‎

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When you use the `-v` flag to mount a local directory into the container, it overrides the content of the container's directory with the content from your local directory. This means that even if files are ignored during the build process, they will still appear in the container if they exist in the mounted directory.
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![Hot Reload](./imgs/hot-reload.png)
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![Hot Reload](/imgs/DevOps/Docker/hot-reload.png)
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--------------------------------------------
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‎DevOps/Docker/docker-networking.md‎

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- App inside Docker container runs in an isolated docker network.
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- To access the app from outside the container, we need to map the container port to the host port which is called **port binding**.
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![Container Port vs Host Port](/imgs/DevOps/Docker/container-port-vs-host-port.png)
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## Port Binding
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- It can communicate with all containers using **their IP addresses**.
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![Docker Host](/imgs/DevOps/Docker/docker-host.png)
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------------------
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![None Network Driver](/imgs/DevOps/Docker/docker-none-network.png)
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## Bridge Network Driver (Default)
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### veth Interfaces in Bridge Networks
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inet 172.17.0.2/16 brd 172.17.255.255 scope global eth0
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### Notes
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- It has certain advantages most importantly, **service discovery.** Containers on the same user-defined bridge network can communicate with each other using their container names. This is because Docker provides a built-in DNS server that resolves container names to their IP addresses. This makes it easier to connect containers together without having to know their IP addresses.
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## Overlay Network Driver (Multi-Host Networking)
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‎DevOps/Docker/docker-swarm.md‎

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Worker nodes are responsible for running the containers. They receive tasks from the manager node and execute them.
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![Docker Swarm Architecture](/imgs/DevOps/Docker/docker-swarm-architecture.png)
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--------------------

‎DevOps/Docker/dockerize-some-apps-on-github.md‎

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title: "Dockerize some apps on Github"
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author: "Salma Ayman"
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title: Docker
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author: Salma Ayman
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I will pick some random apps from Github and Dockerize them. This will help me gain more experience with Docker and also learn how to Dockerize different types of applications.

‎DevOps/Docker/index.md‎

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My learning diary for Docker.
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## Before you start
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- **Linux Users**: Installing Docker is a breeze with your package manager. If you’re an Arch Linux user like me, check out my guide to [installing Docker on Arch Linux](arch-linux-installation.md).
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- **Linux Users**: Installing Docker is a breeze with your package manager. If you’re an Arch Linux user like me, check out my guide to [installing Docker on Arch Linux](/imgs/DevOps/Docker/arch-linux-installation.md).
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- **Windows Users**: Oh, Windows users, bless your hearts. If only you could **switch to Linux** and save yourself some hassle!
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- [Sysadmin with Docker](https://hamk-sysadmin-docker.github.io/exercises/):This is also a good resource to practice Docker.
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## References
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