CI with Docker in Docker
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Today Docker is like our lifeline, its the de-facto. In the world full of docker, you would most likely be running your Jenkins in Docker and then you would want to build your app which is also dockerized. And thats when you realise - life is not simple :) This talk will cover what is Docker in docker? Why is it a challenge? The talk will talk about how docker-in-docker is helpful in running your CI and how to address the challenges in doing so.
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CI with Docker in Docker
- 1. CI with Docker-in-Docker Mukta Aphale @muktaa mukta@velotio.com
- 2. AGENDA Recap: CI, Jenkins Jenkins + Docker Docker in Docker problems 3 ways to solve docker-in-docker Jenkins with Docker-in-Docker: Simplest way Advantages of dind in CI pipeline VP Devops & Cloud, Velotio Technologies (We are hiring!!) => mukta@velotio.com Developer for 1 decade and in Devops for another decade! (Probably successful) Entrepreneur Love to solve problems creatively Love to travel, cook, paint, explore and meet people Mother to two (handsome) boys! @muktaa mukta@velotio.com
- 3. Run everything inside Docker containers. Even Docker itself!
- 4. Quick Recap Docker Runtime Continuous Integration Jenkins Jenkins in Docker
- 5. This is the problem: Building container apps on Jenkins which is running as a container Docker in Docker Problems When starting a container, the inner Docker might try to apply security profiles that will conflict or confuse the outer Docker. When you run Docker in Docker, the outer Docker runs on top of a normal filesystem but the inner Docker runs on top of a copy-on-write system Handling build cache: if your CI system does builds and rebuilds, each time youll restart your Docker-in-Docker container, you might be nuking its cache
- 6. And then there was light They didnt know it was impossible, so they did it. - Mark Twain Sysbox Container runtime, based on runc, Enables to run Docker-in-Docker securely and easily, integrating with existing CI tools seamlessly https://github.com/nestybox/sysbox Socket Solution Run docker with the default Unix socket docker.sock as a volume docker run -v /var/run/docker.sock:/var/run/docker.sock -ti docker Security Risks Dind Use official Docker image with dind tag: docker run --privileged -d --name dind-test docker:dind Outer container runs in privileged mode
- 7. Using disposable containers in CI https://stefanprodan.com/2016/continuous-integration-with-jenkins-and-disposable-containers/
- 8. Jenkins Pipeline with Docker Jenkins Master Docker Plugin Docker Host, API Docker Image Configure Docker & Agent (Jenkins -> Config -> Cloud -> Docker) Jenkins Job https://narenchejara.medium.com/how-to-configure-docker-container-as-build-slaves-for-jenkins-d7795f78402d
- 9. Jenkins Setup with Docker-in-Docker 1. Run Jenkins in container using official image (docker:dind) a. Customized image: https://github.com/4OH4/jenkins-docker 2. Or, Clone repo and build image docker run -it -p 8080:8080 -p 50000:50000 -v jenkins_home:/var/jenkins_home -v /var/run/docker.sock:/var/run/docker.sock --restart unless-stopped 4oh4/jenkins-docker docker build -t jenkins-docker . docker run -it -p 8080:8080 -p 50000:50000 -v jenkins_home:/var/jenkins_home -v /var/run/docker.sock:/var/run/docker.sock --restart unless-stopped 4oh4/jenkins-docker
- 10. Advantages of using Docker-in-Docker in CI On demand build environments No need for dedicated VMs Useful for microservices which are written in different languages Cost effective Better automation of continuous testing Very useful for performance testing
- 12. Thank You!