I'm trying to run an image of wordpress in docker 1.6.2 with kernel 2.6.32-042stab106.4, I'm tight on that kernel because docker is installed in a VPS.
When Docker tries to download the image the system ran out of space.
I tried to change the driver the storage driver to device mapper but then the docker daemon does not start.
Make sure you periodically clean up old images/containers to free up space:
#!/bin/bash
# Delete all containers
sudo docker rm $(sudo docker ps -a -q)
# Delete all images
sudo docker rmi $(sudo docker images -q)
Related
My project includes a Dockerfile to build an image. I've made modifications to that Dockerfile and want to see if it works. So i closed my program and listed all docker images in powershell using docker image ls -a. I deletetd all unused images using docker rmi -f $(docker images -a -q) and docker image prune -a.
But my image keeps not getting deleted, but simply 'untagged':
Untagged: my_image:latest
Untagged: my_image#sha256:16eb92a476be0...
All containers are stopped and deleted before trying to remove the image.
When i restart my application to build a new image, the old one keeps getting used:
> docker image ls -a
REPOSITORY TAG IMAGE ID CREATED
/my_image latest 0d79904a74b0 2 months ago
How do i actually physically remove the old image so my application can build a new one?
At first, you need to delete/stop the running container that is using your image(which one you want to remove).
docker ps -a: To see all the running containers in your machine.
docker stop <container_id>: To stop a running container.
docker rm <container_id>: To remove/delete a docker container(only if it stopped).
docker image ls: To see the list of all the available images with their tag, image id, creation time and size.
docker rmi <image_id>: To delete a specific image.
docker rmi -f <image_id>: To delete a docker image forcefully
docker rm -f (docker ps -a | awk '{print$1}'): To delete all the docker container available in your machine
docker image rm <image_name>: To delete a specific image
To remove the image, you have to remove/stop all the containers which are using it.
docker system prune -a: To clean the docker environment, removing all the containers and images.
I'm reading through the Docker documentation and I don't understand the difference between:
docker container prune
and
docker rm $(docker container ls -aq)
Note that in the link, the second command I've listed is docker rm $(docker ps -a -q), but there is no difference between that and what I've written. container ls is just the newer version of the ps command.
It seems that both of these commands remove all stopped containers. Is there more to it than that, or are these just synonyms?
I don't think there is substantial difference. This -a though means list all containers and as a result docker rm ... will also try to remove running containers. This gives the error that you see below:
Error response from daemon: You cannot remove a running container [...] Stop the container before attempting removal or force remove
example:
$ docker container run --rm -itd alpine:latest
0ec4d7459d35749ecc24cc5c6fd748f4254b0782f73f1ede76cf49b1fc53b2d4
$ docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
0ec4d7459d35 alpine:latest "/bin/sh" 4 seconds ago Up 1 second jovial_ritchie
$ docker rm $(docker container ls -aq)
Error response from daemon: You cannot remove a running container 0ec4d7459d35749ecc24cc5c6fd748f4254b0782f73f1ede76cf49b1fc53b2d4. Stop the container before attempting removal or force remove
$ docker container prune
WARNING! This will remove all stopped containers.
Are you sure you want to continue? [y/N] y
Total reclaimed space: 0B
But... difference when --force, -f is used:
In this case, the commands do 2 different things:
docker rm -f ... Forces the removal of a running container (uses SIGKILL) which means that it will remove running containers.
$ docker rm -f $(docker container ls -aq)
0ec4d7459d35
docker container prune -f will remove all stopped containers without asking for confirmation (no [y/N] prompt will be printed).
$ docker container prune -f
Total reclaimed space: 0B
The effects of the two commands are indeed similar, but there are some nuances to consider:
docker container prune can be used with the --filter option.
docker container prune has a synchronous protection that blocks concurrent prune executions on the daemon.
docker container prune attempts to remove only the containers that are not running, instead of trying to delete all containers and relying on the daemon to throw an exception for those that are not stopped, therefore is quicker and does not generate unnecessary error logs in case someone is tracking the daemon logs.
docker container prune builds a report at the end of its execution, providing the reclaimed space. The report is added in daemon.EventsService and implicitly displayed on the screen.
docker container prune is shorter
In the end of this answer I have a question: Why would someone type 15 additional characters to get the same result or worse?
docker system prune -f : to remove all the stopped containers (docker do not touch the running containers)
docker system prune -a : to remove all the stopped containers (docker do not touch the running containers) + unused images
docker rm <container_id> : remove a specific container, it should be stopped before (docker stop <container_id>)
I'm newby in Devops culture and also eager to learn and use but I get stuck every time when i try something new and now i can't delete images.
It says; it's being used by running container, stop it and then.....
See the screenshots:
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Get running containers
docker ps
Get all running and stopped container
docker ps -a
Stop single container
docker stop <container_id>
Stop all containers
docker stop $(docker ps -aq)
Remove single container
docker rm <container_id>
Remove all containers
docker rm $(docker ps -aq)
Remove single image
docker rmi <image_id>
Remove all images
docker rmi $(docker images -q)
Remove everything from Docker host machine(use with caution because will delete everything like images, containers,networks etc)
docker system prune
You can just force remove the image even when there is a container that is still using it, if you don't mind doing that.
docker image rm <image-name> --force
Best way to delete all stopped containers is
docker container prune
As for the running containers, you should be able to list them with
docker container ls
add (--all) to see all (running/stopped) containers
docker container ls --all
Use docker ps -a to list all your running containers. You will find the ones still running. Stop them by using docker stop NAMEOFTHECONTAINER and remove them with docker rm NAMEOFTHECONTAINER.
I am rather new to Docker, I have recently started running ubuntu container, and stopped it gracefully a few days later (I do not see it using "docker ps"). When I tried to remove ubuntu image using
docker rmi ubuntu
I got the following error:
Error response from daemon: conflict: unable to remove repository reference "ubuntu" (must force) - container 65c315b169b8 is using its referenced image 747cb2d
60bbe
Can I use "--force" to force a removal of the image,
docker rmi ubuntu --force
Or is there a graceful/safer way to do it?
By default docker ps will only show running containers. You can show the stopped ones using docker ps --all.
You can then remove the container first with docker rm <CONTAINER_ID>
If you want to remove all of the containers, stopped or not, you can achieve this from a bash prompt with
$ docker rm $(docker ps --all -q)
The -q switch returns only the IDs
Since everyone else seemed unwilling to test yet willing to preach, I decided to test this out myself:
I downloaded a new image so I knew it wasn't in use
I ran a new container
I deleted the image using docker rmi --force <name>
Image was only untagged, not deleted
I failed to delete the image using docker rmi --force <ID> as docker rebuked with "image is being used by running container 922a12161de6"
So the results are:
The image gets untagged when you name it, but Docker (at least the version I'm using, 19.03.5 build 633a0ea) is smart enough to not actually delete the layers when they are in use.
As a result, the container continues to run fine as the layers are still there, they're simply untagged. You can docker rmi <ID> or docker images prune (without -a it will only delete "dangling" images, I. E. not including unused ones).
Thus the answer is "yes, but it won't delete containers if that's what you're hoping for", but now you know why.
I'm not satisfied with how most of the other answers tell you to find running containers, however, since they seem to say "list all images" -- why? You're trying to delete a specific image.
Stefano's answer is more accurate but here are some tweaks to it:
imageName=ubuntu
containerIds=$(docker ps -a | grep "$imageName" | awk '{ print $1 }')
docker stop $containerIds
docker rm $containerIds
docker rmi "$imageName"
Basically, I added a variable for the image naem and a stop step.
Docker doesn't copy the image data to each container, all the containers running the image have a read only pointer to that part of the filesystem (with their own local RW layer for the individual containers). So if you delete an image while a container is using it, you would break the container and overlay filesystem that it depends on.
Instead, just remove the container first. It may be exited rather than running, so you can do a docker ps -a | grep $image_id for a quick list of containers running that specific image id, but the preferred list would include any descendants:
docker rm $(docker ps -aq --filter "ancestor=747cb2d60bbe")
Then you'll be able to run your docker image rm (or docker rmi) command.
Update: If you force remove an image, all docker does is untag it. The image layers still exists on the filesystem until the container is deleted and then you can delete those image layers. E.g.:
/ $ docker run -d --rm busybox tail -f /dev/null
dac68c445371feab453ba3e3fc80efee52043f6b177fd0a71d0b55b38753f2cf
/ $ docker image rm busybox
Error response from daemon: conflict: unable to remove repository reference "busybox" (must force) - container dac68c445371 is using its referenced image 020584afccce
/ $ docker image rm --force busybox
Untagged: busybox:latest
Untagged: busybox#sha256:1303dbf110c57f3edf68d9f5a16c082ec06c4cf7604831669faf2c712260b5a0
/ $ docker image ls -a
REPOSITORY TAG IMAGE ID CREATED SIZE
<none> <none> 020584afccce 2 weeks ago 1.22MB
Even after deleting the container the layers are still there:
/ $ docker ps -l
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
dac68c445371 020584afccce "tail -f /dev/null" 52 seconds ago Up 50 seconds brave_yalow
/ $ docker stop dac
dac
/ $ docker image ls -a
REPOSITORY TAG IMAGE ID CREATED SIZE
<none> <none> 020584afccce 2 weeks ago 1.22MB
But after the container has been removed you can cleanup the layers:
/ $ docker image prune
WARNING! This will remove all dangling images.
Are you sure you want to continue? [y/N] y
Deleted Images:
deleted: sha256:020584afccce44678ec82676db80f68d50ea5c766b6e9d9601f7b5fc86dfb96d
deleted: sha256:1da8e4c8d30765bea127dc2f11a17bc723b59480f4ab5292edb00eb8eb1d96b1
Total reclaimed space: 1.22MB
If you want to do it gracefully, you should find if there are other images using ubuntu. Anyway in your case, you have a container related to that image.
Here's an example script on how to get this:
containerId=$( docker container ls -a | grep ubuntu | awk '{ print $1 }' )
docker container rm $containerId
docker image rm ubuntu
Remove all containers and after all images to win some space !
$ docker rm $(docker ps -all -q)
$ docker rmi $(docker image ls -q)
You can try the prune option available with docker images in case you want to remove all unused images.
https://docs.docker.com/engine/reference/commandline/image_prune/#usage
docker image prune -a
When would one delete docker images
When they are short of disk space and
They know for certain that they dont need an image or if they can readily download from internet/docker registry later when they need
So if you have internet access and if you have disk space issues you can just delete the image by force
Why you are getting the error:
Docker thinks there is a container - which is currently stopped - which was using this image. If you delete this stopped docker, "docker rmi" would work without force
These are the basic useful commands for docker to view and delete stuff.
View all docker images: docker image ls
View docker containers: docker ps
Stop docker container: docker stop <container name>
Remove docker container: docker rm <container name>
Remove docker image: docker rmi image <image name>
Delete Docker images except for current one - docker image prune -a
I want to rebuild everything from my docker VM named default, I used docker-compose down but it only removed the containers, all the requirements are still installed and I would like it to be as it was from the beginning so I can 're'-setup everything. Is it possible ?
This will remove all containers, images and volumes
docker rm -f $(docker ps -aq)
docker image rm $(docker image ls -q)
docker volume rm $(docker volume ls -q)
There are other things like networks and secrets that will not be removed, but they should not cause any problems.
If you are using a newer version of docker try the docker system prune -a command instead.
But maybe the --no-cache argumant ist the real solution for your problem. With it, docker will not use the cache and will do a full rebuild of the image.
The simple solution that will ignore previous builds:
docker-compose build --no-cache
But if you want something more destructive:
docker-machine rm default
docker-machine create default
eval $(docker-machine env default)