Docker

Use Docker without sudo

For this, we need to add the user to the docker mod.

Below is the terminal command:

Now we need to logout and login again to see effects.

Pull and run a public docker image from the docker hub.

Here’s the command

version is optional

Docker advantages

1 Its light

2 Its fast

3 It allows to have different configuration layer

i.e. We can separate it form the actual OS configs.

4 We also get the benefit of running the same image

with different versions simultaneously on the same computer.

Basic Commands

docker pull imageName:version

This gets the public image from docker hub.

The version is optional

docker images

It shows the list of all images

docker run imageName:version

Here things get interesting.

If you mentioned the version while pulling, you must do so now too.

Else docker will pull the latest version of it and then run it.

💡 Well, you can stop it by just doing a Ctrl+C that’s it.

docker ps

lists down all the currently running images.

💡 We can also use Ctrl+C to stop the image

docker run -d imageName

To run the image in detached mode i.e. now Ctrl+C won’t work on it.

It runs in detached mode

example

Now to stop a detached image

We need to

💡 docker ps
Now we have the id
We can stop it simply using
docker stop id

docker ps -a

This prints the whole history.

From here we can start a container with its id.

by using the command

docker run -p:containerPort image:version

Now the command above looks a bit big.

Let me break it down.

Let’s first have an example

Result

This helps us bind a host port to the container port.

This is really helpful when we want to run 2 versions of the same image.

We can bind them to 2 different ports.

docker logs id

This helps us see the logs of a container.

This helps us solve bugs and errors.

💡 we can also use names instead of id here

Naming the docker containers

docker run —name custom-name image:version

docker rm container_id_or_name

This command removes the container

ex

Remove all containers

💡

To get the interactive terminal of a container

To exit the terminal simply Enter exit

Here -it stands for interactive mode.

Docker Volume

Think of them as special folders that you can use to store data outside of your container. This is really helpful because it means that even if your container gets deleted or crashes, your data will still be safe and sound.

Example