Introduction to Project atomic (CentOS Dojo Bangalore)
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Project Atomic is a framework designed to create an optimized operating system for running containers, built from RHEL, CentOS, and Fedora, aiming for easier management and enhanced security. Key components include rpm-ostree for system updates, Docker for container management, and Kubernetes for orchestrating containerized applications. The project also involves special interest groups (SIGs) for developing specialized CentOS variants to enhance software capabilities while maintaining stability.
Introduction to Project atomic (CentOS Dojo Bangalore)
- 1. Introduction to Project Atomic Lalatendu Mohanty @lalatenduM, lalatenduM on Freenode, lala@redhat.com
- 2. Topics ● What is Project Atomic? ● Rpm-ostree ● Cockpit ● Kubernets ● /usr/bin/atomic ● Docker ● SPC ● Nulecule ● CentOS Atomic SIG ● Getting Involved
- 3. What is Project Atomic?
- 4. To Begin With ● It is not a new GNU/Linux distribution. ● Framework to create an OS from RHEL, CentOS and Fedora. ● Aim of Project Atomic is to create a better OS for containers.
- 5. Why Atomic? ● For running containers we don't need a full fledged distribution. ● Optimized OS for running and maintaining containers. ● Less number of packages to maintain.
- 6. Why Atomic? ● Maintaining these systems should be relatively less painful. ● Updating the system should be easy to deploy and manage. ● More secure than the traditional OS
- 7. What Atomic Hosts Won't Provide ● YUM install will not work inside Atomic host ● Official images would have minimal package set.
- 8. Atomic hosts comprises of ● Rpm-ostree ● Cockpit ● Kubernets ● /usr/bin/atomic ● Docker ● SPC
- 9. rpm-ostree
- 10. OSTree “OSTree was born to help implement a continuous delivery model for operating systems. One can be a lot more confident in updating systems if one knows that a reliable rollback system is always available.” COLIN WALTERS Senior Software Engineer, Inventor of OSTree Red Hat
- 11. rpm-ostree ● Git for operating systems. ● Update methods of containers and applied them to operating system. ● No more half way upgraded systems # yum update bash: yum: command not found # atomic host upgrade Upgrade prepared for next boot # atomic host rollback Successfully reset deployment
- 12. Why rpm-ostree? ● Atomic host would only run containers. ● Atomic update makes more sense for an immutable system. ● Allows reuse of RPMs. ● No need to re-invent wheel on packaging. ● Option to rollback to previous state (old good state).
- 13. How rpm-ostree works? ● Fiilesystem is read-only except /var and /etc ● All data (e.g. containers) are unchanged on upgrade. ● /etc gets updated through a 3-way merge.
- 14. Docker ● Built-in Docker run time in Atomic host. ● Docker run would just work. – $docker run -t -i fedora /bin/bash
- 15. Kubernetes ● An open source system for managing containerized applications across multiple hosts ● It gives basic mechanisms for deployment, maintenance, and scaling of applications.
- 16. Nulecule ● Provide a simple, flexible way to describe a multi-container application, including all dependencies. https://github.com/projectatomic/nulecule ● Nulecule: The mother of all atomic particles ● Refer: http://simpsons.wikia.com/wiki/Made- up_words
- 17. Cockpit ● Server manager for administrating Linux servers via web browser. ● Designed to be multi-server ● Support for managing containers, Kubernetes. ● http://cockpit-project.org/
- 19. /usr/bin/atomic ● Coherent entry point : manage host and containers with the atomic command. ● Fill gaps in Linux container implementations. – e.g. “atomic install foo” can install a container with its k8s configuration and/or systemd unit file. – “atomic run” grabs the LABEL “run” with its all command line details. – It can serve as metadata for containers for different use cases
- 20. SPC ● SPC = Super Privileged Containers ● Tools container ● Allows applications inside of containers to interact with or control the host, very useful for system and monitoring tools
- 21. Special interest groups (SIGs) ● For building specialized variants of CentOS that fulfill specific sets of requirements. ● Freedom to modify and enhance CentOS in various ways, including adding more cutting-edge software, rebuilding existing packages. ● To get the best of both worlds – the overall stability of CentOS and newer technology from various open source projects.
- 22. CentOS Atomic SIG ● To deliver CentOS based Atomic host. ● Also building a downstream of RHEL Atomic host. ● http://wiki.centos.org/SpecialInterestGroup/Atomic ● Centos-devel Mailing list and irc channel.
- 23. References ● Introduction to Atomic - Joe Brockmeier - https://www.youtube.com/watch?v=cPltG4Yd KVE ● https://github.com/GoogleCloudPlatform/kube rnetes ● https://github.com/projectatomic
- 24. Get involved ● Website: projectatomic.io ● Github: github.com/projectatomic ● #atomic on Freenode ● centos-devel, atomic-devel, atomic ML ● Facebook.com/projectatomic ● Twitter @projectatomic
- 25. Thank you :-) Any questions please?