How to check how many containers there are in docker

In docker, you can use the ps command to view how many containers there are. This command is used to list the containers. When the parameter is set to "-a", you can display all containers including those that are not running. The syntax is " docker ps -a".

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

How to check how many containers there are in docker

docker ps: List containers

Syntax

docker ps [OPTIONS]

OPTIONS Description:

• -a: Display all containers, including those that are not running.

• -f : Filter the displayed content based on conditions.

• --format: Specify the template file for the return value.

• -l : Display recently created containers.

• -n: List the recently created n containers.

• --no-trunc: Do not truncate the output.

• -q: Silent mode, only the container number is displayed.

• -s: Display the total file size.

The example is as follows:

List all running container information.

runoob@runoob:~$ docker ps
CONTAINER ID   IMAGE          COMMAND                ...  PORTS                    NAMES
09b93464c2f7   nginx:latest   "nginx -g 'daemon off" ...  80/tcp, 443/tcp          myrunoob
96f7f14e99ab   mysql:5.6      "docker-entrypoint.sh" ...  0.0.0.0:3306->3306/tcp   mymysql

Output details:

CONTAINER ID: Container ID.

IMAGE: The image used.

COMMAND: Command to run when starting the container.

CREATED: The creation time of the container.

STATUS: Container status.

There are 7 states:

• created (created)

• restarting (restarting)

• running

• removing

• paused

• exited (stop)

• dead (death)

PORTS: The port of the container Information and connection type used (tcp\udp).

NAMES: Automatically assigned container name.

Recommended learning: "docker video tutorial"

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