Related
Running the docker registry with below command always throws an error:
dev:tmp me$ docker run \
-d --name registry-v1 \
-e SETTINGS_FLAVOR=local \
-e STORAGE_PATH=/registry \
-e SEARCH_BACKEND=sqlalchemy \
-e LOGLEVEL=DEBUG \
-p 5000:5000 \
registry:0.9.1
Error response from daemon: Conflict. The name "registry-v1" is already in use by container f9e5798a82e0. You have to delete (or rename) that container to be able to reuse that name.
How can I prevent this error ?
I got confused by this also. There are two commands relevant here:
docker run # Run a command in a **new** container
docker start # Start one or more stopped containers
That means you have already started a container in the past with the parameter
docker run --name registry-v1 ...
You need to delete that first before you can re-create a container with the same name with
docker rm registry-v1
When that container is sill running you need to stop it first before you can delete it with
docker stop registry-v1
Or simply choose a different name for the new container.
To get a list of existing containers and their names simply invoke
docker ps -a
Here what i did, it works fine.
step 1:(it lists docker container with its name)
docker ps -a
step 2:
docker rm name_of_the_docker_container
When you are building a new image you often want to run a new container each time and with the same name. I found the easiest way was to start the container with the --rm option:
--rm Automatically remove the container when it exits
e.g.
docker run --name my-micro-service --rm <image>
Sadly it's used almost randomly in the examples from the docs
Edit: Read Lepe's comment below.
Just to explain what others are saying (it took me some time to understand) is that, simply put, when you see this error, it means you already have a container and what you have to do is run it. While intuitively docker run is supposed to run it, it doesn't. The command docker run is used to only START a container for the very first time. To run an existing container what you need is docker start $container-name. So much for asking developers to create meaningful/intuitive commands.
You have 2 options to fix this...
Remove previous container using that name, with the command docker rm $(docker ps -aq --filter name=myContainerName)
OR
Rename current container to a different name i.e change this portion --name registry-v1 to something like --name myAnotherContainerName
You are getting this error because that container name ( i.e registry-v1) was used by another container in the past...even though that container may have exited i.e (currently not in use).
Cause
A container with the same name is still existing.
Solution
To reuse the same container name, delete the existing container by:
docker rm <container name>
Explanation
Containers can exist in following states, during which the container name can't be used for another container:
created
restarting
running
paused
exited
dead
You can see containers in running state by using :
docker ps
To show containers in all states and find out if a container name is taken, use:
docker ps -a
Here is how I solved this on ubuntu 18:
$ sudo docker ps -a
copy the container ID
For each container do:
$ sudo docker stop container_ID
$ sudo docker rm container_ID
removing all the exited containers
docker rm $(docker ps -a -f status=exited -q)
The Problem: you trying to create new container while in background container with same name is running and this situation causes conflicts.
The error would be like:
Cannot create continer for service X :Conflict. The name X is already in use by container abc123xyz. You have to remove ot delete (or rename) that container to be able to reuse that name.
Solution rename the service name in docker-compose.yml or delete the running container and rebuild it again (this solution related to Unix/Linux/macOS systems):
get all running containers sudo docker ps -a
get the specific container id
stop and remove the duplicated container / force remove it
sudo docker stop <container_id>
sudo docker rm <container_id>
or
sudo docker rm --force <container_id>
You can remove it with command sudo docker rm YOUR_CONTAINER_ID, then run a new container with sudo docker run ...;
or restart an existing container with sudo docker start YOUR_CONTAINER_ID
I was running into this issue that when I run docker rm (which usually works) I would get:
Error: No such image
The easiest solution to this is removing all stopped containers by running:
docker container prune
I have solved the issue by doing following steps and I hope it helps.
Type docker ps -a to list all the containers in your system.
Check the NAMES part where you have initialized your docker container.
Then type docker rm --force name_of_container
Install the docker container as you wish.
I had problem using NIFI and I have removed and reinstalled using docker. Good luck.
TL:DR;
List all containers:
docker ps -a
Remove the concerned container by id:
docker container rm <container_id>
I'm just learning docker and this got me as well. I stopped the container with that name already and therefore I thought I could run a new container with that name.
Not the case. Just because the container is stopped, doesn't mean it can't be started again, and it keeps all the same parameters that it was created with (including the name).
when I ran docker ps -a that's when I saw all the dummy test containers I created while I was playing around.
No problem, since I don't want those any more I just did docker rm containername at which point my new container was allowed to run with the old name.
Ah, and now that I finish writing this answer, I see Slawosz's comment on Walt Howard's answer above suggesting the use of docker ps -a
The OP's problem is the error. Deleting state isn't the only solution - or even a good one. The problem is docker run isn't re-entrant, and docker start is impotent w/o run. So we have to combine them.
For example to run Postgres w/o destroying previous state, try this:
docker start postgres || docker run -d -p 5432:5432 --name postgres -e POSTGRES_PASSWORD=password postgres:13-alpine
Ok, so I didn't understand either, then I left my pc, went to do other things, and upon my return, it clicked :D
You download a docker image file. docker pull *image-name* will just pull the image from docker hub without running it.
Now, you use docker run, and give it a name (e.g. newWebServer).
docker run -d -p 8080:8080 -v volume --name newWebServer image-name/version
You perhaps only need docker run --name *name* *image*, but the other stuff will become useful quickly.
-d (detached) - means the container will exit when the root process used to run the container exits.
-p (port) - specify the container port and the host port. Kind of the internal and external port. The internal one being the port the container uses, and the external one is the port you use outside of it and probably the one you need to put in your web browser if that's how you access your app.
--name (what you want to call this instance of the container) - you could have several instances of the same container all with different names, which is useful when you're trying to test something.
image-name/version is the actual image you want to create the container from. You can see a list of all the images on your system with docker images -a. You may have more than one version, so make sure you choose the correct one/tag.
-v (volume) - perhaps not needed initially, but soon you'll want to persist data after your container exits.
OK. So now, docker run just created a container from your image. If it isn't running, you can now start it with it's name:
docker start newWebServer
You can check all your containers (they may or may not be running) with
docker ps -a
You can stop and start them (or pause them) with their name or the container id (or just the first few characters of it) from the CONTAINER ID column e.g:
docker stop newWebServer
docker start c3028a89462c
And list all your images, with
docker images -a
In a nutshell, download an image; docker run creates a container from it; start it with docker start (name or container id); stop it with docker stop (name or container id).
I had this issue because I had two or more containers with the same container_name in the docker-compose.yml file.
Simple Solution: Goto your docker folder in the system and delete .raw file or docker archive with large size.
For me, the issue was that I used an image name more than once in the dockerfile.
This happened to me on the docker tutorial! The port I tried to use was taken, but docker still created.. an image? A process to run docker? I'll find out soon. Anyways, to choose a different port, I had to remove the older image, and then docker run again.
Sometimes a tutorial can be too terse. What you want is concise, not terse, or even succinct.
What is the difference between docker run and docker create commands?
I usually use run but sometimes in documentation I see create.
Docker's --help tells
create Create a new container
run Run a command in a new container
Does it mean that run is used when we need to pass a command to a new container? What's the aim of create then?
docker run = docker create + docker start.
From docker documentation
The docker create command creates a writeable container layer over the
specified image and prepares it for running the specified command. The
container ID is then printed to STDOUT. This is similar to docker run
-d except the container is never started. You can then use the docker start command to start the container at any point.
This is useful when you want to set up a container configuration ahead
of time so that it is ready to start when you need it. The initial
status of the new container is created.
docker create command creates a writeable container from the image and prepares it for running.
docker run command creates the container (same as docker create) and starts it.
The other answers have this covered but I thought I'd show the equivalent shell command-lines because it makes it really clear:
$ docker run myimage
is the same as
$ docker start -a $(docker create myimage)
Here, docker create is used to create a container from the named image and outputs the created container id and docker start is used to start the container with that id. The -a option causes the terminal to attach so that the container runs in the foreground which is the default behaviour of docker run.
A container that has been created but never started will have a Created status; this can be seen with docker container ls -a.
I'm new to docker and just got around to playing with it;
My take is that docker run essentially does the following: (in the order of..) docker create, docker start, docker attach , since it immediately attaches to the active shell after you do the 'run' command.
to create a container:
to start a container:
to create and start with a single command:
Now to understand we must dig deep with create and start.
Process of creating a container is taking the file system from image, and kind of prep it for use in the new container. When we create the container we are just prepping or setting up the file system snapshot to be used to create the container to actually start the container.
So creating container is about the file system starting it is about actually executing the startup the command.
And to start the container, we actually execute the start up command that might start up the process.
Lets see it in terminal:
When I run command "sudo docker create hello-world" it prints bellow output.
In the output we saw characters printed out. This is the ID of the container that was just created, Now I can actually execute the hello world command inside of this container by running Docker start.
So what happened here, first off we kind of prop the container by getting the file system ready.
Then after that we actually executed the primary start up command in there with Docker start.
-a in the docker start command is for watching output from the container and print it out to your terminal.
So there is very small difference between Docker run and docker start, by default Docker run is going to show you all the logs or all the information coming out of the container. By default Docker start is the opposite Docker start is not going to show you information coming out of the terminal.
Now you know when you need to use Run / Create / Start
Docker run is basically for running commands in the container.
docker run -it <Container Name> /bin/bash
The above is for creating a bash terminal. And make us use bash commands in the container.
Docker create is to create a container from an Docker Image.
docker create -d /var/lib:/var/lib --name docker-ubuntu ubuntu
The above is to create a docker a container of the name "docker-ubuntu" from the image "ubuntu"
For logging purposes I want to know the name of the Docker instance that my program is running under.
For example if I start it as:
docker run -d --name my-docker-name some/image
how can i find the actual docker name (my-docker-name, in this example) from a program running in it?
TL;DR: --hostname option.
Issue
Container's program cannot access its container's name.
Solution a) -dirty and not easy-
https://stackoverflow.com/a/36068029/5321002
Solution b)
Add the option -h|--hostname="" matching the same name as the docker container name. Then you just need to query the hostname from the program and you're done.
edit
Solution c)
Provide, as you suggested, a env-variable with the name. The overall command would look like as follow:
$name="custom-uniq-name"
$docker run -h $name --name $name -e NAME=$name image-to-run
if you add
-v /var/run/docker.sock:/var/run/docker.sock
to your
docker run
command, you expose docker socket to the container, and you will be able to launch docker commands, such as
docker ps --filter
Keep in mind that this is potentially dangerous, now your container has a privileged access to the host.
In practice to start a container I do:
docker run a8asd8f9asdf0
If thats the case, what does:
docker start
do?
In the manual it says
Start one or more stopped containers
This is a very important question and the answer is very simple, but fundamental:
Run: create a new container of an image, and execute the container. You can create N clones of the same image. The command is:
docker run IMAGE_ID and not docker run CONTAINER_ID
Start: Launch a container previously stopped. For example, if you had stopped a database with the command docker stop CONTAINER_ID, you can relaunch the same container with the command docker start CONTAINER_ID, and the data and settings will be the same.
run runs an image
start starts a container.
The docker run doc does mention:
The docker run command first creates a writeable container layer over the specified image, and then starts it using the specified command.
That is, docker run is equivalent to the API /containers/create then /containers/(id)/start.
You do not run an existing container, you docker exec to it (since docker 1.3).
You can restart an exited container.
Explanation with an example:
Consider you have a game (iso) image in your computer.
When you run (mount your image as a virtual drive), a virtual drive is created with all the game contents in the virtual drive and the game installation file is automatically launched. [Running your docker image - creating a container and then starting it.]
But when you stop (similar to docker stop) it, the virtual drive still exists but stopping all the processes. [As the container exists till it is not deleted]
And when you do start (similar to docker start), from the virtual drive the games files start its execution. [starting the existing container]
In this example - The game image is your Docker image and virtual drive is your container.
run command creates a container from the image and then starts the root process on this container. Running it with run --rm flag would save you the trouble of removing the useless dead container afterward and would allow you to ignore the existence of docker start and docker remove altogether.
run command does a few different things:
docker run --name dname image_name bash -c "whoami"
Creates a Container from the image. At this point container would have an id, might have a name if one is given, will show up in docker ps
Starts/executes the root process of the container. In the code above that would execute bash -c "whoami". If one runs docker run --name dname image_name without a command to execute container would go into stopped state immediately.
Once the root process is finished, the container is stopped. At this point, it is pretty much useless. One can not execute anything anymore or resurrect the container. There are basically 2 ways out of stopped state: remove the container or create a checkpoint (i.e. an image) out of stopped container to run something else. One has to run docker remove before launching container under the same name.
How to remove container once it is stopped automatically? Add an --rm flag to run command:
docker run --rm --name dname image_name bash -c "whoami"
How to execute multiple commands in a single container? By preventing that root process from dying. This can be done by running some useless command at start with --detached flag and then using "execute" to run actual commands:
docker run --rm -d --name dname image_name tail -f /dev/null
docker exec dname bash -c "whoami"
docker exec dname bash -c "echo 'Nnice'"
Why do we need docker stop then? To stop this lingering container that we launched in the previous snippet with the endless command tail -f /dev/null.
daniele3004's answer is already pretty good.
Just a quick and dirty formula for people like me who mixes up run and start from time to time:
docker run [...] = docker pull [...] + docker start [...]
It would have been wiser to name the command "new" instead of "run".
Run creates a container instance of an existing (or downloadable) image and starts it.
Running the docker registry with below command always throws an error:
dev:tmp me$ docker run \
-d --name registry-v1 \
-e SETTINGS_FLAVOR=local \
-e STORAGE_PATH=/registry \
-e SEARCH_BACKEND=sqlalchemy \
-e LOGLEVEL=DEBUG \
-p 5000:5000 \
registry:0.9.1
Error response from daemon: Conflict. The name "registry-v1" is already in use by container f9e5798a82e0. You have to delete (or rename) that container to be able to reuse that name.
How can I prevent this error ?
I got confused by this also. There are two commands relevant here:
docker run # Run a command in a **new** container
docker start # Start one or more stopped containers
That means you have already started a container in the past with the parameter
docker run --name registry-v1 ...
You need to delete that first before you can re-create a container with the same name with
docker rm registry-v1
When that container is sill running you need to stop it first before you can delete it with
docker stop registry-v1
Or simply choose a different name for the new container.
To get a list of existing containers and their names simply invoke
docker ps -a
Here what i did, it works fine.
step 1:(it lists docker container with its name)
docker ps -a
step 2:
docker rm name_of_the_docker_container
When you are building a new image you often want to run a new container each time and with the same name. I found the easiest way was to start the container with the --rm option:
--rm Automatically remove the container when it exits
e.g.
docker run --name my-micro-service --rm <image>
Sadly it's used almost randomly in the examples from the docs
Edit: Read Lepe's comment below.
Just to explain what others are saying (it took me some time to understand) is that, simply put, when you see this error, it means you already have a container and what you have to do is run it. While intuitively docker run is supposed to run it, it doesn't. The command docker run is used to only START a container for the very first time. To run an existing container what you need is docker start $container-name. So much for asking developers to create meaningful/intuitive commands.
You have 2 options to fix this...
Remove previous container using that name, with the command docker rm $(docker ps -aq --filter name=myContainerName)
OR
Rename current container to a different name i.e change this portion --name registry-v1 to something like --name myAnotherContainerName
You are getting this error because that container name ( i.e registry-v1) was used by another container in the past...even though that container may have exited i.e (currently not in use).
Cause
A container with the same name is still existing.
Solution
To reuse the same container name, delete the existing container by:
docker rm <container name>
Explanation
Containers can exist in following states, during which the container name can't be used for another container:
created
restarting
running
paused
exited
dead
You can see containers in running state by using :
docker ps
To show containers in all states and find out if a container name is taken, use:
docker ps -a
Here is how I solved this on ubuntu 18:
$ sudo docker ps -a
copy the container ID
For each container do:
$ sudo docker stop container_ID
$ sudo docker rm container_ID
removing all the exited containers
docker rm $(docker ps -a -f status=exited -q)
The Problem: you trying to create new container while in background container with same name is running and this situation causes conflicts.
The error would be like:
Cannot create continer for service X :Conflict. The name X is already in use by container abc123xyz. You have to remove ot delete (or rename) that container to be able to reuse that name.
Solution rename the service name in docker-compose.yml or delete the running container and rebuild it again (this solution related to Unix/Linux/macOS systems):
get all running containers sudo docker ps -a
get the specific container id
stop and remove the duplicated container / force remove it
sudo docker stop <container_id>
sudo docker rm <container_id>
or
sudo docker rm --force <container_id>
You can remove it with command sudo docker rm YOUR_CONTAINER_ID, then run a new container with sudo docker run ...;
or restart an existing container with sudo docker start YOUR_CONTAINER_ID
I was running into this issue that when I run docker rm (which usually works) I would get:
Error: No such image
The easiest solution to this is removing all stopped containers by running:
docker container prune
I have solved the issue by doing following steps and I hope it helps.
Type docker ps -a to list all the containers in your system.
Check the NAMES part where you have initialized your docker container.
Then type docker rm --force name_of_container
Install the docker container as you wish.
I had problem using NIFI and I have removed and reinstalled using docker. Good luck.
TL:DR;
List all containers:
docker ps -a
Remove the concerned container by id:
docker container rm <container_id>
The OP's problem is the error. Deleting state isn't the only solution - or even a good one. The problem is docker run isn't re-entrant, and docker start is impotent w/o run. So we have to combine them.
For example to run Postgres w/o destroying previous state, try this:
docker start postgres || docker run -d -p 5432:5432 --name postgres -e POSTGRES_PASSWORD=password postgres:13-alpine
I'm just learning docker and this got me as well. I stopped the container with that name already and therefore I thought I could run a new container with that name.
Not the case. Just because the container is stopped, doesn't mean it can't be started again, and it keeps all the same parameters that it was created with (including the name).
when I ran docker ps -a that's when I saw all the dummy test containers I created while I was playing around.
No problem, since I don't want those any more I just did docker rm containername at which point my new container was allowed to run with the old name.
Ah, and now that I finish writing this answer, I see Slawosz's comment on Walt Howard's answer above suggesting the use of docker ps -a
Ok, so I didn't understand either, then I left my pc, went to do other things, and upon my return, it clicked :D
You download a docker image file. docker pull *image-name* will just pull the image from docker hub without running it.
Now, you use docker run, and give it a name (e.g. newWebServer).
docker run -d -p 8080:8080 -v volume --name newWebServer image-name/version
You perhaps only need docker run --name *name* *image*, but the other stuff will become useful quickly.
-d (detached) - means the container will exit when the root process used to run the container exits.
-p (port) - specify the container port and the host port. Kind of the internal and external port. The internal one being the port the container uses, and the external one is the port you use outside of it and probably the one you need to put in your web browser if that's how you access your app.
--name (what you want to call this instance of the container) - you could have several instances of the same container all with different names, which is useful when you're trying to test something.
image-name/version is the actual image you want to create the container from. You can see a list of all the images on your system with docker images -a. You may have more than one version, so make sure you choose the correct one/tag.
-v (volume) - perhaps not needed initially, but soon you'll want to persist data after your container exits.
OK. So now, docker run just created a container from your image. If it isn't running, you can now start it with it's name:
docker start newWebServer
You can check all your containers (they may or may not be running) with
docker ps -a
You can stop and start them (or pause them) with their name or the container id (or just the first few characters of it) from the CONTAINER ID column e.g:
docker stop newWebServer
docker start c3028a89462c
And list all your images, with
docker images -a
In a nutshell, download an image; docker run creates a container from it; start it with docker start (name or container id); stop it with docker stop (name or container id).
I had this issue because I had two or more containers with the same container_name in the docker-compose.yml file.
Simple Solution: Goto your docker folder in the system and delete .raw file or docker archive with large size.
For me, the issue was that I used an image name more than once in the dockerfile.
This happened to me on the docker tutorial! The port I tried to use was taken, but docker still created.. an image? A process to run docker? I'll find out soon. Anyways, to choose a different port, I had to remove the older image, and then docker run again.
Sometimes a tutorial can be too terse. What you want is concise, not terse, or even succinct.