What is the difference between create and run in docker

In docker, both the create command and the run command can create a new container. The difference is that the create command creates a new container but does not start it, while the run command creates a new container and runs a command.

The operating environment of this tutorial: linux7.3 system, docker-1.13.1 version, Dell G3 computer

What is the difference between create and run in docker

The following is the purpose of these commands:

• The docker create command creates a brand new one from a Docker image container. However, it won't run it immediately.

• The docker start command will start any stopped containers. If you created a container using the docker create command, you can use this command to start it.

• The docker run command is a combination of create and start as it creates a new container and starts it immediately. In fact, the docker run command can even pull the image from Docker Hub if it cannot find the above image on your system.

Let's look at it with examples so you can understand things more clearly.

Let's see it through an example

If you want to follow the example, make sure you have Docker installed.

Suppose you use the docker pull ubuntu command to download the Ubuntu image from Docker Hub.

You can view all available Docker images on your system. In this example, I only have ubuntu (to avoid confusion):

# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
ubuntu              latest              775349758637        5 weeks ago         64.2MB

Now, create a new docker container named container-1 using the docker create command:

# docker create --name container-1 ubuntu
6a81a998658e9e0d3b612ee65b07d76a45d79812d860baf3f1cbc60fe997ebec

You can see it A new container has been created. If you try to view all running containers, you won't see container-1 because although it was created, it was never started.

# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

If you check all containers, whether they are running or not, you will see that container-1 has "created" status:

# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
6a81a998658e        ubuntu              "/bin/bash"         18 seconds ago      Created                                 container-1

Now, let us use the docker run command to create and run A container named container-2:

# docker run -it -d --name container-2 ubuntu bash
6391c1a0cac6c9f5fc6f5cfb05d75a22c208e63223c3b231035a40a4b134c521

You can see that container-2 is running because its status is "Started":

# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED              STATUS              PORTS               NAMES
6391c1a0cac6        ubuntu              "bash"              About a minute ago   Up About a minute                       container-2

Let's stop this running Container:

# docker stop container-2
container-2
# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                      PORTS               NAMES
6391c1a0cac6        ubuntu              "bash"              2 minutes ago       Exited (0) 28 seconds ago                       container-2
6a81a998658e        ubuntu              "/bin/bash"         3 minutes ago       Created                                         container-1

Now we have a stopped container, you can start it again using docker start command:

# docker start container-2
container-2
# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
6391c1a0cac6        ubuntu              "bash"              2 minutes ago       Up 2 seconds                            container-2

But, what happens to container-1 created using docker create command ? You can start this container using docker start command and then use docker exec to run specific stuff.

Recommended learning: "docker video tutorial"

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