Anyone who works with Docker regularly is familiar with the common commands docker ps and docker ps -a.
I know that docker ps lists all running containers in the Docker engine, but what does the "ps" actually mean?
I also know that docker ps -a has the effect of also listing containers that have stopped, but what does the -a actually mean?
-a is short form for the --all. option This option will show all the containers both stopped and running.
ps is an abbreviation for "process status". Normally, docker ps only shows the running containers, but adding the -a option causes it to show all containers.
You can find more details in the Docker "ps" options documentation.
ps means “Process Status”, so docker ps basically shows all of the Docker processes actively running.
docker ps lists all containers that are up and running.
-a means all (both stopped and running) containers.
docker ps = docker container list = docker container ls
All commands above are aliases.
The command docker ps is very useful. For example:
docker container kill $(docker ps -q) — Kill all running containers.
docker container rm $(docker ps -a -q) — Delete all not running containers.
The command docker ps was created based on unix's ps command. Here, ps is an abbreviation for "process status".
Translated to docker, docker ps lists containers. Executing docker ps lists all running containers, while executing docker ps -a (or docker ps --all) lists all containers.
Related
I built a container on a private server running the command docker build -t image-name . and then ran it docker run -it image-name. But when I check the container list docker ps, it doesn't show.
Probably the container is failing to start and is not listed in the active containers of your server.
Try to check the status of all your containers with docker ps -a docker ps.
See the logs of the container using docker logs.
Anyone who works with Docker regularly is familiar with the common commands docker ps and docker ps -a.
I know that docker ps lists all running containers in the Docker engine, but what does the "ps" actually mean?
I also know that docker ps -a has the effect of also listing containers that have stopped, but what does the -a actually mean?
-a is short form for the --all. option This option will show all the containers both stopped and running.
ps is an abbreviation for "process status". Normally, docker ps only shows the running containers, but adding the -a option causes it to show all containers.
You can find more details in the Docker "ps" options documentation.
ps means “Process Status”, so docker ps basically shows all of the Docker processes actively running.
docker ps lists all containers that are up and running.
-a means all (both stopped and running) containers.
docker ps = docker container list = docker container ls
All commands above are aliases.
The command docker ps is very useful. For example:
docker container kill $(docker ps -q) — Kill all running containers.
docker container rm $(docker ps -a -q) — Delete all not running containers.
The command docker ps was created based on unix's ps command. Here, ps is an abbreviation for "process status".
Translated to docker, docker ps lists containers. Executing docker ps lists all running containers, while executing docker ps -a (or docker ps --all) lists all containers.
I start with
docker run rasa/rasa
as tutorials from Youtube suggest.
but when I do
docker ps
it shows empty list of containers. I thought run command should start container processing.
Why is doesnt start? What am I doing wrong?
Also
docker ps -a
shows me a giant list of exited containers, but I didn't exit them.
With command docker ps -a command shows you all the containers running/stopped/exited. These are the containers that you tried to run but somehow due to some internal errors those container got stopped and are not running anymore and it shows the status exited(not running).
With command docker ps, it shows only running containers. As no containers are running on your machine thats why it is not showing anything. It requires -a argument to show you the all containers like docker ps -a (Show all containers).
I was wondering if there is any difference between
docker start <container name>
and
docker container start <container name>
I personally always use docker container start though, because that is the method that was suggested to run a stopped container. What would be the difference if I use docker start instead?
There is no difference between docker container start and docker start.
Over time, the docker cli has become more organized so that, for example, there are separate docker container inspect and docker image inspect commands. Earlier, there was a single command that would do both depending on the arguments, which could be confusing. There are a number of commands that are there for historic reasons (like docker ps, docker inspect, etc) that duplicate functionality that is now also available via subcommands of docker container, docker image, and so on.
Why does docker compose create containers that are only accecible from docker-compose ps and that persist after killing running container ?
It doesn't.
docker ps only shows running containers, docker-compose ps shows all containers related to the current compose file, running and stopped. docker-compose kill just force stops the container and it can be restarted with docker-compose start, it will therefore be visible when running docker-compose ps but not docker ps.
To list all containers with docker use docker ps -a. To removed stopped containers related to a compose file run docker-compose rm, if you want to stop and remove all containers, have a look at docker-compose down.
docker-compose is the software wrapper around docker and there is not full support still. You can try to read a little bit about kubernets and mesos for the comparing different clusters built on top of docker or similar container systems.
article on blog about swarm and compose