Docker run The `docker run` command is one of the most use…

Under the Hood, `docker run` are 2 commands:

docker create+docker start

- a container layer is created on the top of an image
- the container just created is started

It's important to understand this to avoid confusion between docker run, docker start, and docker create

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Docker RUN Common Options:

--name: assign a name
--rm: remove it when it exits
-p: publish ports
-e: set environment variable
-d: run it in the background
--network: connect it to a network
-i: keep stdin open
--mount: set a volume or bind mount
--user: set a user

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Assign a name (--name)

By default, a random name is assigned, but in general is a good idea to assign a custom name to our containers, as we do to our pets!

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Remove the container when exits (--rm)

Useful for disposable containers and examples. When a container is stopped, it’s automatically removed. Handy

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Publish Ports (-p)

To expose a port or a series of ports on the Host Machine.

You can also specify a protocol, for example -p 8080:80/tcp to Map TCP port 80 in the container to port 8080 in the Host

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Environment Variables (-e)

Sets an environment variable in the container. It can also overwrite existing environment variables defined in the Dockerfile

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Run in background (-d)

To run a container in the background, leaving the terminal free. The container ID will be printed on the terminal for further uses

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Connect to a Network (--network)

Connects to a network.

To attach a running container to an existing network:
Docker network connect
To disconnect a running container from a network:
Docker network disconnect

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Keep STDIN open (-i)

In some cases, a very useful option to access directly on the terminal of the container. Often used in combination with -t, to allocate a pseudo-TTY

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Start a container with a volume (--mount)

Docker volumes are the preferred way to persist data in Docker.
Docker run --mount source=volume1,target=/path
Please note that even if you can use the -v option, the --mount is the new preferred one

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Use a custom User (--user)

Specifies a username for the container, Very useful in some cases to avoid using the default one defined in the image

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