Docker - Working with Containers

In this chapter, we will explore in detail what we can do with containers.

docker top

With this command, you can see the top processes within a container.

Syntax

docker top ContainerID 

Options

ContainerID − This is the Container ID for which you want to see the top processes.

Return Value

The output will show the top-level processes within a container.

Example

sudo docker top 9f215ed0b0d3 

The above command will show the top-level processes within a container.

Output

When we run the above command, it will produce the following result −

docker stop

This command is used to stop a running container.

Syntax

docker stop ContainerID 

Options

ContainerID − This is the Container ID which needs to be stopped.

Return Value

The output will give the ID of the stopped container.

Example

sudo docker stop 9f215ed0b0d3 

The above command will stop the Docker container 9f215ed0b0d3.

Output

When we run the above command, it will produce the following result −

docker rm

This command is used to delete a container.

Syntax

docker rm ContainerID 

Options

ContainerID − This is the Container ID which needs to be removed.

Return Value

The output will give the ID of the removed container.

Example

sudo docker rm 9f215ed0b0d3 

The above command will remove the Docker container 9f215ed0b0d3.

Output

When we run the above command, it will produce the following result −

docker stats

This command is used to provide the statistics of a running container.

Syntax

docker stats ContainerID 

Options

ContainerID − This is the Container ID for which the stats need to be provided.

Return Value

The output will show the CPU and Memory utipzation of the Container.

Example

sudo docker stats 9f215ed0b0d3 

The above command will provide CPU and memory utipzation of the Container 9f215ed0b0d3.

Output

When we run the above command, it will produce the following result −

docker attach

This command is used to attach to a running container.

Syntax

docker attach ContainerID 

Options

ContainerID − This is the Container ID to which you need to attach.

Return Value

None

Example

sudo docker attach 07b0b6f434fe 

The above command will attach to the Docker container 07b0b6f434fe.

Output

When we run the above command, it will produce the following result −

Once you have attached to the Docker container, you can run the above command to see the process utipzation in that Docker container.

docker pause

This command is used to pause the processes in a running container.

Syntax

docker pause ContainerID 

Options

ContainerID − This is the Container ID to which you need to pause the processes in the container.

Return Value

The ContainerID of the paused container.

Example

sudo docker pause 07b0b6f434fe 

The above command will pause the processes in a running container 07b0b6f434fe.

Output

When we run the above command, it will produce the following result −

docker unpause

This command is used to unpause the processes in a running container.

Syntax

docker unpause ContainerID

Options

ContainerID − This is the Container ID to which you need to unpause the processes in the container.

Return Value

The ContainerID of the running container.

Example

sudo docker unpause 07b0b6f434fe 

The above command will unpause the processes in a running container: 07b0b6f434fe

Output

When we run the above command, it will produce the following result −

docker kill

This command is used to kill the processes in a running container.

Syntax

docker kill ContainerID

Options

ContainerID − This is the Container ID to which you need to kill the processes in the container.

Return Value

The ContainerID of the running container.

Example

sudo docker kill 07b0b6f434fe 

The above command will kill the processes in the running container 07b0b6f434fe.

Output

When we run the above command, it will produce the following result −

Docker – Container Lifecycle

The following illustration explains the entire pfecycle of a Docker container.

Initially, the Docker container will be in the created state.

Then the Docker container goes into the running state when the Docker run command is used.

The Docker kill command is used to kill an existing Docker container.

The Docker pause command is used to pause an existing Docker container.

The Docker stop command is used to pause an existing Docker container.

The Docker run command is used to put a container back from a stopped state to a running state.