What is the role of dockerignore file

0 votes
How does this file help?
Jul 5, 2019 in Docker by Nizam
4,096 views

1 answer to this question.

0 votes

To understand the role of .dockerignore file, let us take a practical example. You may have noticed that if you put a Dockerfile in your home directory and launch a docker build you will see a message uploading context. Right? This means docker creates a .tar with all the files in your home and in all the subdirectories, and uploads this tar to the docker daemon. If you have some huge files, this may take a long time.

In order to avoid this, you might need to create a specific directory, where you put your Dockerfile, and all what is needed for your build. It becomes necessary to tell docker to ignore some files during the build. Hence, you need to put in the .dockerignore all the files not needed for your build

Before the docker CLI sends the context to the docker daemon, it looks for a file named .dockerignore in the root directory of the context. If this file exists, the CLI modifies the context to exclude files and directories that match patterns in it. This helps to avoid unnecessarily sending large or sensitive files and directories to the daemon and potentially adding them to images using ADD or COPY.

answered Jul 5, 2019 by Sirajul
• 59,230 points

Related Questions In Docker

+1 vote
1 answer

What is the default amount of memory provided for Windows Docker containers?

Docker for Windows containers by default get: On ...READ MORE

answered Oct 25, 2018 in Docker by Sophie may
• 10,620 points
777 views
0 votes
0 answers

what is the use of docker history command in Docker?

I am trying to find the initial ...READ MORE

Jun 20, 2019 in Docker by Shubham
• 1,000 points
1,434 views
0 votes
1 answer

What is the difference between “expose” and “publish” in Docker?

Basically, you have three options: Neither specify EXPOSE nor -p -> ...READ MORE

answered Jul 18, 2018 in Docker by Nilesh
• 7,060 points
3,270 views
+2 votes
1 answer
+2 votes
1 answer

Deploy Docker Containers from Docker Cloud

To solve this problem, I followed advice ...READ MORE

answered Sep 3, 2018 in AWS by Priyaj
• 58,020 points
2,703 views
+1 vote
1 answer

What is a docker file? How do I create a docker image with dockerfile?

 A Dockerfile is a script/text configuration file that contains ...READ MORE

answered Jun 7, 2019 in Docker by Sirajul
• 59,230 points
4,483 views
0 votes
1 answer

Is it possible to use JSON instead of YAML for docker-compose file?

You can use JSON instead of YAML ...READ MORE

answered Jul 2, 2019 in Docker by Sirajul
• 59,230 points
4,951 views
webinar REGISTER FOR FREE WEBINAR X
REGISTER NOW
webinar_success Thank you for registering Join Edureka Meetup community for 100+ Free Webinars each month JOIN MEETUP GROUP