I tried to use the
docker cp :
it always says the
Error: No such container:path:Docker container ID..
Can you tell me how to find the path of the docker(location conatiner) ?
I think the windows file path is correct.
If you want to do it using Dockerfile you can use COPY instruction. Else if you want to do it using docker run command, you can do it the following way:
docker run -d \
--name devtest \
--mount source=myvol2,target=/app \
nginx:latest
or if you want to use docker volume
docker run -d \
--name devtest \
-v myvol2:/app \
nginx:latest
Reference: https://docs.docker.com/storage/volumes/
In your case as you want to mount the host directory to container's, it'll be the former
you can copy files/folder in a container using COPY/ADD command in Dockerfile.
COPY <host-source> <container-dest>
or else you can mount volumes, during docker build or in the docker-compose.yml file.
Eg. for Dockerfile:
docker run -d \
--name devtest \
--mount source=myvol2,target=/app \
nginx:latest
Eg. for docker-compose.yml file
volumes:
- db-data:/var/lib/mysql/data
Dockerfile: https://docs.docker.com/storage/volumes/
docker-compose.yml: https://docs.docker.com/compose/compose-file/
To use docker cp use the instruction as shown:
docker cp ./path/to/local/folder/. ContainerName:/app/
You have to provide the container id/name for container name.
docker ps --filter status=running
The above command will show you the running containers, from where you can select the target container name or id for use (first about 4 characters of the id should be enough)
Related
I run a docker container of nginx with the following: docker container run -d --name nginx3 -p 85:80 -v $(pwd):/usr/share/nginx/html nginx , then when I add files in the container volume (/usr/share/nginx/html) they are also added locally on the $pwd folder.
But when I remove the container, image, and volume with docker rm -vf $(docker ps -aq) && docker rmi -f $(docker images -aq) && docker volume prune the files on my local $pwd folder are still there.. why were they not deleted when I removed the volume?
That's because docker volume prune delete the docker volumes and not the mounted volumes from the host.
If you define a volume with docker volume create nginx_volume and then use
docker container run -d --name nginx3 -p 85:80 -v nginx_volume:/usr/share/nginx/html nginx
the volume will be deleted
You are not using a docker volume, you are using a bind mount. This was not that clear with the -v syntax, that's why docker recommends the new --mount syntax for new users:
This creates a bind mount from the host OS. Docker is not owner of it and therefore not deleting the folder if you unmount the binding.
docker run -d \
-it \
--name devtest \
--mount type=bind,source="$(pwd)"/target,target=/app \
nginx:latest
Further reading
This creates a docker volume, which is managed by docker. And therefore all volume-commands can be applied:
docker run -d \
--name devtest \
--mount source=myvol2,target=/app \
nginx:latest
Further reading
OS: Windows server 2016
I have an App wrote in Go and put in a docker container. The App has to access "D:\test.db". How can I do that?
Using docker volumes and by using the -v or --mount flag when you start your container.
A modified example from the Docker docs:
$ docker run -d \
--mount source=myvol2,target=/app \
nginx:latest
you just need to replace nginx:latext with your image name and adapt source and target as you need.
Another example (also from the docs) using -v and mounting in read-only mode:
$ docker run -d \
-v nginx-vol:/usr/share/nginx/html:ro \
nginx:latest
I build a image of my web project with all my dependencies in the image at /app. When running the container it's start blazing fast and I'm able to access the application instantly.
However I build all the thing directly in the Dockerfile so the host has nothing except the Dockerfile.
So I try to retrieve the project files like so docker run -v $(pwd):/app image_name but it seems the folder is overrided because when trying to serve the public folder it can't be found anymore. By just exclude the volume option it's start well.
Am I right when I'm thinking it override my container folder?
Why did this works for the GitLab Project? (https://docs.gitlab.com/omnibus/docker/README.html#prerequisites)
They got all the project in the container, and mount it on the host.
sudo docker run --detach \
--hostname gitlab.example.com \
--publish 443:443 --publish 80:80 --publish 22:22 \
--name gitlab \
--restart always \
--volume /srv/gitlab/config:/etc/gitlab \
--volume /srv/gitlab/logs:/var/log/gitlab \
--volume /srv/gitlab/data:/var/opt/gitlab \
gitlab/gitlab-ce:latest
For named volumes, the image contents are copied from the image to the named volumes upon volume creation. This named volume will have the contents of /bin copied to the volume:
docker run -ti -v busyboxbin:/bin busybox sh
Bind mounted directories are mounted in place and override any image contents. So this example would fail (unless you already had a copy of the files in /tmp/empty)
docker run -ti -v /tmp/empty:/bin busybox sh
The gitlab container will populate the bind mounted volume contents after the image was started. The logs are easy to add what's there. The data directory may need to be initialised by the app. The image probably comes with pre canned config to populate and run with if no files exist.
I am using the following Dockerfile to build Solr using Docker.
FROM solr:5.5
ENV SOLR_HOME=/opt/solr/server/solr/cores
RUN mkdir ${SOLR_HOME}
RUN chown -R solr:solr ${SOLR_HOME}
VOLUME ["${SOLR_HOME}"]
EXPOSE 8983
I try to run the following Docker command to mount a host directory to the container:
docker run --restart=always -d --name solr-demo \
--privileged=true -p 8983:8983 \
-v /data/solr_demo:/opt/solr/server/solr/cores \
solr-test:latest
I am also copying the required solr.xml file into the data/solr_demo. When I run the docker run command I get the following error:
stat: cannot stat ‘/opt/solr/server/solr/cores’: No such file or directory 42146d74b446ba4784fd197688e3210f294aad8755ae730cc559132720bcc35a
Error response from daemon: Container 42146d74b446ba4784fd197688e3210f294aad8755ae730cc559132720bcc35a is restarting, wait until the container is running
From your comment, it appears you're mounting a nonexistent directory for your volume. Try this command that mounts /data/solr_demo1 instead of /data/solr_demo as your volume.
docker run --restart=always -d --name solr-demo \
--privileged=true -p 8983:8983 \
-v /data/solr_demo1:/opt/solr/server/solr/cores \
solr-test:latest
If it is really an user problem (it remind me of some issue I add with apache in container), you should consider using Gosu. https://github.com/tianon/gosu
It will let you run and swap user correctly and have a nice mapping from your local users and users inside the container.
Hope it will be useful.
I am currently using Boot2Docker on Windows. Is it possible to mount root to host?
Say that I'm using an Ubuntu image and I would like to mount / to the host. How can I do so?
I've been looking around and trying:
docker run -v /c/Users/ubuntu:/ --name ubuntu -dt ubuntu
But I ended up with an error:
docker: Error response from daemon: Invalid bind mount spec "/c/Users/ubuntu:/": volumeslash: Invalid specification: destination can't be '/' in '/c/Users/Leon/ubuntu:/'.
If I understand correctly, you are trying to mount root inside a container as a volume? If that is the case, rather create a new directory inside and expose that one.
For example, dockerfile:
RUN mkdir /something
VOLUME /something
As the Docker documentation says, the container directory must always be an absolute path such as /src/docs. The host-dir can either be an absolute path or a name value.
For more information read this: https://docs.docker.com/engine/userguide/containers/dockervolumes/#mount-a-host-directory-as-a-data-volume and part "Mount a host directory as a data volume" should give you better understanding.
It's the problem with how you are specifying the path. See the example of mounting a local volume to be used by a container for MongoDB:
docker run --name *container-name* -v **/Users/SKausha3/mongo/imageservicedb/data**:/*data* -v **/Users/SKausha3/mongo/imageservicedb/backup**:/*backup*
c:/Users/SKausha3/mongo/imageservicedb/data is my local folder, but you have to remove 'c:' from the path.
Since you cant mount "/" one option is to add a "WORKDIR" to your Dockerfile, that way all subsequent commands will be relative to that dir and you wont have to modify anything!
FROM python:latest
WORKDIR /myapp
COPY appfile.py appfile.py
In your docker image, the "appfile.py" file will be in the /myapp/appfily.py location.
You cannot specify the '/' root directory of container but you can mount all the folders in to docker volumes present in root directory.....
create volumes by running these command one by one or you can create bash script
docker volume create var
docker volume create usr
docker volume create tmp
docker volume create sys
docker volume create srv
docker volume create sbin
docker volume create run
docker volume create root
docker volume create proc
docker volume create opt
docker volume create mnt
docker volume create media
docker volume create libx32
docker volume create lib64
docker volume create lib32
docker volume create lib
docker volume create home
docker volume create etc
docker volume create dev
docker volume create boot
docker volume create bin
Then run this command
docker run -it -d \
--name=ubuntu-container \
--mount source=var,destination=/var \
--mount source=usr,destination=/usr \
--mount source=tmp,destination=/tmp \
--mount source=sys,destination=/sys \
--mount source=srv,destination=/srv \
--mount source=sbin,destination=/sbin \
--mount source=run,destination=/run \
--mount source=root,destination=/root \
--mount source=opt,destination=/opt \
--mount source=mnt,destination=/mnt \
--mount source=media,destination=/media \
--mount source=libx32,destination=/libx32 \
--mount source=lib64,destination=/lib64 \
--mount source=lib32,destination=/lib32 \
--mount source=lib,destination=/lib \
--mount source=home,destination=/home \
--mount source=etc,destination=/etc \
--mount source=boot,destination=/boot \
--mount source=bin,destination=/bin \
ubuntu:latest