I am using COPY command in my docker file on top of ubuntu 16.04. I am getting error as no such file or directory eventhough the directory is present. In the below docker file I want to copy the directory "auth" present inside workspace directory to the docker image (at path /home/ubuntu) and then build the image.
FROM ubuntu:16.04
RUN apt-get update
COPY /home/ubuntu/authentication/workspace /home/ubuntu
WORKDIR /home/ubuntu/auth
a Dockerfile COPY command can only refer to files under the context - the current location of the Dockerfile, aka .
so you have a few options now:
if it is possible to copy the /home/ubuntu/authentication/workspace/ directory content to somewhere inside your project before the build (so now it will be included in your Dockerfile context and you can access it via COPY ./path/to/content /home/ubuntu) it can be great. but sometimes you dont want it.
instead of copying the directory, bind it to your container via a volume:
when you run the container, add a -v option:
docker run [....] -v /home/ubuntu/authentication/workspace:/home/ubuntu [...]
mind that a volume is designed so any change you made inside the container dir(/home/ubuntu) will affect the bound directory on your host side (/home/ubuntu/authentication/workspace) and vice versa.
i found a something over here: this guy is forcing the Dockerfile to accept his context- he is sitting inside the /home/ubuntu/authentication/workspace/ directory, and running there
docker build . -f /path/to/Dockerfile
so now inside his Dockerfile he can refer to /home/ubuntu/authentication/workspace as his context (.)
Related
I'm a new leaner of docker.I came a cross a problem while I'm trying to make my own docker image.
Here's the thing.I create a new DockerFile to build my own mysql image in which I declared MYSQL_ROOT_PASSWORD and put some init scripts in the container.
Here is my Docker
FROM mysql:5.7
MAINTAINER CarbonFace<553127022#qq.com>
ENV TZ Asia/Shanghai
ENV MYSQL_ROOT_PASSWORD Carbon#mysqlRoot7
ENV INIT_DATA_DIR /initData/sql
ENV INIT_SQL_FILE_0 privileges.sql
ENV INIT_SQL_FILE_1 carbon_user_sql.sql
ENV INIT_SQL_FILE_2 carbonface_sql.sql
COPY ./my.cnf /etc/mysql/donf.d/
RUN mkdir -p $INIT_DATA_DIR
COPY ./sqlscript/$INIT_SQL_FILE_0 $INIT_DATA_DIR/
COPY ./sqlscript/$INIT_SQL_FILE_1 $INIT_DATA_DIR/
COPY ./sqlscript/$INIT_SQL_FILE_2 $INIT_DATA_DIR/
COPY ./sqlscript/$INIT_SQL_FILE_0 /docker-entrypoint-initdb.d/
COPY ./sqlscript/$INIT_SQL_FILE_1 /docker-entrypoint-initdb.d/
COPY ./sqlscript/$INIT_SQL_FILE_2 /docker-entrypoint-initdb.d/
CMD ["mysqld"]
I'm trying to build a docker image which contains my own config file and when mounted it would be showed in the local directory and can be modified.
I'm really confused that when I start my container with this image like the official description and also here is my commands:
docker run -dp 3306:3306 \
-v /usr/local/mysql/data:/var/lib/mysql \
-v/usr/local/mysql/conf:/etc/mysql/conf.d \
--name mysql mysql:<my builded tag>
You know I'm trying to mounted the
/usr/local/mysql/conf to the /etc/mysql/conf.d in the container which is been told as the custom config file mounted location.
And I supposed that my custom config file my.cnf which has been copied into the image during docker build and would be show in my local direcroty /usr/local/mysql/conf
And since I already copied my custom config file into image which you can see in my DockerFile.
But it turns out that the directory is empty and the /etc/mysql/conf.d is also overwrite by local directory.
Before I run my container, both /usr/local/mysql/conf and /usr/local/mysql/data is empty at all.
OK fine, I've been told that the volume mounted directory would overwrite the file inside the container.
But how could the empty data directory shows the data files inside the container but the empty conf directory overwrite the conf.d directory in the container.
It make no sense.
I was very confused and I would be very appreciate it if someone can explain why it happens.
My OS is MacOS Big Sur and I used the latest docker.
A host-directory bind mount, -v /host/path:/container/path, always hides the contents of the image and replaces it with the host directory. If the host directory is empty, the container directory will be the same empty directory at container startup time.
The Docker Hub mysql container has an involved entrypoint script that checks to see if the data directory is empty, and if so, initializes the database; abstracted out
#!/bin/sh
# (actually in hundreds of lines of shell code, with more options)
if [ ! -d /var/lib/mysql/data/mysql ]; then
mysql_install_db
# (...and start a temporary database server and run the
# /docker-entrypoint-initdb.d scripts)
fi
# then run the main container command
exec "$#"
Simply the presence of a volume doesn't cause files to be copied (with one exception at one specific point in the lifecycle for named volumes), so if you need to copy content from a container to the host you either need to do it manually with docker cp or have a way in the container code to do it.
Based on bitnami-docker-jasperreports I'm trying to copy some files and folders to jasperserver folder deployed in tomcat, first i added a COPY and ADD instructions within my Dockerfile and both of them can not work with the deployed folder because it's not already present or it gets overridden after copying them to it, then I tried to add and ENTRYPOINT, RUN and CMD instructions and all of them have failed.
here is my Dockerfile with Entrypoint instruction
FROM bitnami/jasperreports:7.8.0
ADD . /bitnami/
ENTRYPOINT [ "cp", "/bitnami/jrs/.", "/bitnami/tomcat/data/jasperserver/WEB-INF/" ]
NB: jrs folder is in the same folder as my Dockerfile
Edit: I've added a volume to the container to see jasperserver folder in my machine but i found that the link is broken, however when I acces it trough docker bash it seems fine.
docker bash:
Hello could someone pleas help me on copying docker(I'm starter) host file into my jupyter/pyspark-notebook images. I've pulled this notebook from docker as public available.
I've created a Dockerfile which contains this.
FROM jupyter/pyspark-notebook:latest
ADD /home/abdoulaye/Documents/M2BIGDATA/Jaziri /bin/bash
I've changed /bin/bash to . but nothing is visible.
when I execute docker built it's like it copy files as shown in output below.
when I go to my my notebook I did note found folders. I check my snapshot if I can found these copied folder but I'm very confused.
In clear, I've an running notebook in my docker I use it in y navigator but I can not load data. I like to copy data in place where I can access it in notebook.
You can not copy using absoult path, the path should be relative to Dockerfile, so /home/abdoulaye/Documents/M2BIGDATA/Jaziri this path inside Dockerfile is not correct. Copy file to Dockerfile context and then copy like
ADD M2BIGDATA/Jaziri /work
Now First thing, you should not copy files from host to executable files directory.
For instance,
FROM alpine
copy hello.txt /bin/sh
If you copy like this, it will create a problem to run command inside container as sh or bash will be replaced or corrupt.
2nd, while you are building the docker image with invalid context, it should be the same where your Dockerfile is, so better to run the directory where you place the Dockerfile.
docker build -t my-jupyter .
3rd, you should not run cp command inside container to copy files from host to container.
docker cp /home/abdoulaye/Documents/M2BIGDATA/Jaziri container_id:/work
it will copy your files to /work path of the container.
I am new to docker.
I would like to understand the following questions. I have been searching but I can't find the answers to my questions.
Why do I always get a wrong path when I tried to copy the file?
Does that mean I can only copy the files into the docker image from the same directory where I have my dockerfile? Is there a way to COPY files from other directories on the host?
Is there a way to passing in host's environment variables directly in the Dockerfile without using "ARG" and --build-arg flag?
Below is what I currently have
file structure is like this:
/home/user1/docker
|__ Dockerfile
In the Dockerfile:
From
ARG BLD_DIR=/tmp
RUN mkdir /workdir
WORKDIR /workdir
COPY ${BLD_DIR}/a.file /workdir
I ran
root#localhost> echo $BLD_DIR
/tmp/build <-- BLD_DIR is a custom variable; meaning it's different on each dev env
docker build --build-arg BLD_DIR=${BLD_DIR} -t docker-test:1.0 -f Dockerfile
Always got error like
COPY failed: stat
/var/lib/docker/tmp/docker-builder035089075/tmp/build/a.file: no such file
or directory
In a Dockerfile, you can only copy files that are available in the current Docker build context.
By default, all files in the directory where you run your docker build command are copied to the Docker context folder.
So, when you use ADD or COPY commands, all your paths are in fact relative to build folder, as the documentation states:
Multiple resources may be specified but the paths of files and directories will be interpreted as relative to the source of the context of the build.
This is voluntary because building an image using docker build should not depend on auxiliary files on your system: the same Docker image should not be different if built on 2 different machines.
However, you can have a directory structure like such:
/home/user1/
|___file1
|___docker/
|___|___ Dockerfile
If you run docker build -t test -f docker/Dockerfile . in the /home/user1 folder, your build context will be /home/user1, so you can COPY file1 in your Dockerfile.
For the very same reason, you cannot use environment variables directly in a Dockerfile. The idea is that your docker build command should "pack" all the information needed to generate the same image on 2 different systems.
However, you can hack your way around it using docker-compose, like explaned here: Pass host environment variables to dockerfile.
I want to copy my compiled war file to tomcat deployment folder in a Docker container. As COPY and ADD deals with moving files from host to container, I tried
RUN mv /tmp/projects/myproject/target/myproject.war /usr/local/tomcat/webapps/
as a modification to the answer for this question. But I am getting the error
mv: cannot stat ΓÇÿ/tmp/projects/myproject/target/myproject.warΓÇÖ: No such file or directory
How can I copy from one folder to another in the same container?
You can create a multi-stage build:
https://docs.docker.com/develop/develop-images/multistage-build/
Build the .war file in the first stage and name the stage e.g. build, like that:
FROM my-fancy-sdk as build
RUN my-fancy-build #result is your myproject.war
Then in the second stage:
FROM my-fancy-sdk as build2
COPY --from=build /tmp/projects/myproject/target/myproject.war /usr/local/tomcat/webapps/
A better solution would be to use volumes to bind individual war files inside docker container as done here.
Why your command fails
The command you are running tries to access files which are out of context to for the dockerfile. When you build the image using docker build . the daemon sends context to the builder and only those files are accessible during the build. In docker build . the context is ., the current directory. Therefore, it will not be able to access /tmp/projects/myproject/target/myproject.war.
Copying from inside the container
Another option would be to copy while you are inside the container. First use volumes to mount the local folder inside the container and then go inside the container using docker exec -it <container_name> bash and then copy the required files.
Recommendation
But still, I highly recommend to use
docker run -v "/tmp/projects/myproject/target/myproject.war:/usr/local/tomcat/webapps/myproject.war" <image_name>