CODEWITHSUNDEEP
dockerdocker-composedockerfiledocker-machine
Vipendra Singh
Vipendra Singh

Reputation: 859

How to modifiy a file inside docker Image

I pulled a docker image from https://github.com/snowflakedb/SnowAlert.

But after pulling the Image, I don't see any containers running. I used
docker container ls command and it returned no containers. Now due to some usecase I want to modify a file inside this docker image. What is the correct way to do it?

Thanks

Upvotes: 1

Views: 1789

Answers (2)

Vipendra Singh
Vipendra Singh

Reputation: 859

Here is what resolved my issue. After pulling the repository from the github I ran below commands

sudo docker images

This will display the names of existing images. Now copy the Image name in which you need to do the modification.

sudo docker run -it <copied_image_name> bash

This will open a bash where all the files are residing. Do the modification where ever it is required then type exit

Copy the container Id from below command

sudo docker ps -a

Now we need to commit the changes into new Image using below command

sudo docker commit <container_id> <new_image_name>

Thats all Now do sudo docker images this will display the newly created image with the modified content.

Thanks

Upvotes: 2

Taron Saribekyan
Taron Saribekyan

Reputation: 1390

Don't confuse image with container: https://phoenixnap.com/kb/docker-image-vs-container.

You need to "up" image to create appropriate container for it: https://docs.docker.com/get-started/part2/#run-your-image-as-a-container

If you want to inspect/edit any container use command (it like ssh to container's server):

docker exec -it CONTAINER_ID bash

To get all docker containers and find their IDs use command:

docker ps -a

Upvotes: 0

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