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Add Files And Folders To Images

22 Jul 2020

Make Files And Folders

mkdir projects
touch projects/master_plan.txt
touch projects/backup_plan.txt
mkdir projects/secret-projects
touch config.txt

Create Dockerfile

With COPY the final argument is the destination directory in the image, all other arguments are the source files and folders in the host filesystem.

# Build from base image
FROM ubuntu:latest

# Add files and folders to image
COPY ["projects", "config.txt", "./special-projects/"]

Build Image From Dockerfile

Build the Dockerfile (docker build) in the current directory (.) and call the image chrisalbon/ubuntu:copy-example (--tag chrisalbon/big-project:copy-example).

docker build --tag chrisalbon/big-project:copy-example .

Sending build context to Docker daemon  4.608kB
Step 1/2 : FROM ubuntu:latest
 ---> 1e4467b07108
Step 2/2 : COPY ["projects", "config.txt", "./special-projects/"]
 ---> 487c17de4145
Successfully built 487c17de4145
Successfully tagged chrisalbon/big-project:copy-example

Run Docker Container From Image

Start and create (docker run) an interative (-it) Docker container called copy-example (--name copy-example) from the image called chrisalbon/big-project:copy-example. Open a shell (/bin/bash). Remove the container after it stops (-rm)

docker container run -it --name copy-example chrisalbon/big-project:copy-example /bin/bash

[email protected]:/#

View Destination Directory

View all files and folders (ls) that displays using long format and shows hidden files (-al) in the directory special-projects.

ls -al /special-projects

total 12
drwxr-xr-x 3 root root 4096 Aug 19 05:14 .
drwxr-xr-x 1 root root 4096 Aug 19 05:15 ..
-rw-rw-r-- 1 root root    0 Aug 19 04:42 backup_plan.txt
-rw-rw-r-- 1 root root    0 Aug 19 04:42 config.txt
-rw-rw-r-- 1 root root    0 Aug 19 04:41 master_plan.txt
drwxrwxr-x 2 root root 4096 Aug 19 05:12 secret-projects

Notice two things:

Multiple source directories were placed in a single destination directory.
All files and directories have their ownership set to root. After the COPY line in the Dockerfile, you can use a RUN line to change file ownerships and permissions.