Docker: adding a file from a parent directory
DockerDocker Problem Overview
In my Dockerfile
I've got :
ADD ../../myapp.war /opt/tomcat7/webapps/
That file exists as ls ../../myapp.war
returns me the correct file but when I execute sudo docker build -t myapp .
I've got :
Step 1 : ADD ../../myapp.war /opt/tomcat7/webapps/
2014/07/02 19:18:09 ../../myapp.war: no such file or directory
Does somebody know why and how to do it correctly?
Docker Solutions
Solution 1 - Docker
You can build the Dockerfile from the parent directory:
docker build -t <some tag> -f <dir/dir/Dockerfile> .
Solution 2 - Docker
With docker-compose, you could set context folder:
# docker-compose.yml
version: '3.3'
services:
yourservice:
build:
context: ./
dockerfile: ./docker/yourservice/Dockerfile
Solution 3 - Docker
Unfortunately, (for practical and security reasons I guess), if you want to add/copy local content, it must be located under the same root path than the Dockerfile
.
From the documentation:
> The <src> path must be inside the context of the build; you > cannot ADD ../something/something, because the first step of a docker > build is to send the context directory (and subdirectories) to the > docker daemon.
EDIT: There's now an option (-f
) to set the path of your Dockerfile ; it can be used to achieve what you want, see @Boedy 's response.
Solution 4 - Docker
Adding some code snippets to support the accepted answer.
Directory structure :
setup/
|__docker/DockerFile
|__target/scripts/<myscripts.sh>
src/
|__<my source files>
Docker file entry:
RUN mkdir -p /home/vagrant/dockerws/chatServerInstaller/scripts/
RUN mkdir -p /home/vagrant/dockerws/chatServerInstaller/src/
WORKDIR /home/vagrant/dockerws/chatServerInstaller
#Copy all the required files from host's file system to the container file system.
COPY setup/target/scripts/install_x.sh scripts/
COPY setup/target/scripts/install_y.sh scripts/
COPY src/ src/
Command used to build the docker image
docker build -t test:latest -f setup/docker/Dockerfile .
Solution 5 - Docker
Since -f
caused another problem, I developed another solution.
- Create a base image in the parent folder
- Added the required files.
- Used this image as a base image for the project which in a descendant folder.
The -f
flag does not solved my problem because my onbuild
image looks for a file in a folder and had to call like this:
-f foo/bar/Dockerfile foo/bar
instead of
-f foo/bar/Dockerfile .
Also note that this is only solution for some cases as -f
flag
Solution 6 - Docker
The solution for those who use composer is to use a volume pointing to the parent folder:
#docker-composer.yml
foo:
build: foo
volumes:
- ./:/src/:ro
But I'm pretty sure the can be done playing with volumes in Dockerfile.
Solution 7 - Docker
If you are using skaffold, use 'context:' to specify context location for each image dockerfile - context: ../../../
apiVersion: skaffold/v2beta4
kind: Config
metadata:
name: frontend
build:
artifacts:
- image: nginx-angular-ui
context: ../../../
sync:
# A local build will update dist and sync it to the container
manual:
- src: './dist/apps'
dest: '/usr/share/nginx/html'
docker:
dockerfile: ./tools/pipelines/dockerfile/nginx.dev.dockerfile
- image: webapi/image
context: ../../../../api/
docker:
dockerfile: ./dockerfile
deploy:
kubectl:
manifests:
- ./.k8s/*.yml
skaffold run -f ./skaffold.yaml
Solution 8 - Docker
Solution 9 - Docker
Let's say you have your directories tree like this:
dir0
├───dir1
│ └───dir11
| | └───dockerfile
| └───dir12 (current)
└───dir2 (content to be copied)
and your dockerfile look like this:
FROM baseImage
COPY / /content
Let's say you want to copy dir2 content into a new docker image using COPY
or ADD
of dockerfile that is in dir11 and your current directory is dir12
You will have to run this command in order to build your image properly:
docker build -t image-name:tag -f ../dir11/dockerfile ../../dir2
-t your-image-name
Name and optionally a tag in the 'name:tag' format-f ../dir11/dockerfile
Name of the Dockerfile (Default is 'PATH/Dockerfile')../../dir2
path to be current for COPY or ADD commands
Update
Let's say you run this by mistake:
docker build -t image-name:tag -f ../dir11/dockerfile ../../
This will not solve your problem because in this case the COPY / /content
will look like it's copying dir0 content (dir1 & dir2) so in order to fix that you can either change the command using the right path or you can also change the COPY source path in the dockerfile like this:
COPY /dir2 /content