Docker - LO Man Hei

# Docker

#### Installation (Using the repository)

##### Set up the repository

1\. Update the `apt` package index and install packages to allow `apt` to use a repository over HTTPS:
```bash
 sudo apt-get update
 sudo apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg \
    lsb-release
```

2\. Add Docker’s official GPG key:
```bash
 curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
```

3\. Use the following command to set up the stable repository. To add the `nightly` or `test` repository, add the word nightly or test (or both) after the word `stable` in the commands below.
```bash
echo \
  "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/debian \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
```

##### Install Docker Engine
```bash
 sudo apt-get update
 sudo apt-get install docker-ce docker-ce-cli containerd.io
```

#### Usage

Build an image

```bash
docker build /dir/with/Dockerfile
```

Build an image with tag `-t`

```bash
docker build -t tagName:version /dir/with/Dockerfile
```

Run a container

```bash
docker run ubuntu
```

Run a container with interactive terminal `-it`

```bash
docker run -it ubuntu
```
Run a container and removing itself after exit `--rm`

```bash
docker run -it --rm ubuntu
```

Map TCP port in the container to port on the Docker host `-p`
```bash
# Mapping host's port 8080 to container's port 80
docker run -it --rm -p 8080:80 ubuntu
# Or multiple ports: mapping host's port 8080 and 2222 to container's port 80 and 22
docker run -it --rm -p 8080:80 -p 2222:22 ubuntu
```

Bind a volumn to the container from the Docker host
```bash
docker run -it -v /host/path:/container/path ubuntu
```

#### Source

**Documentation link**: [Docker docs](https://docs.docker.com/)

**Docker CLI Reference**: [CLI Reference](https://docs.docker.com/engine/reference/run/)

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