Academy PRO: Docker. Part 1
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This document provides an agenda for a Docker Academy PRO course. It introduces containers and containerization basics. It discusses how Docker works and the evolution of IT that led to its development. It compares containers to virtual machines and the advantages of containers. Key Docker concepts are explained like images, the Docker daemon, and official Docker images. The document concludes by asking if there are any questions.
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- 11. cgroups - Linux kernel feature that limits, accounts for, and isolates the resource usage (CPU, memory, disk I/O, network, etc.) of a collection of processes. namespaces - feature of the Linux kernel that isolates and virtualizes system resources of a collection of processes (pid, mnt, net..) Linux Containers - operating-system-level virtualization method for running multiple isolated Linux systems (containers) on a control host using a single Linux kernel. LXC combines the kernel's cgroups and support for isolated namespaces to provide an isolated environment for applications.
- 12. High level approach: lightweight VM ● own process space ● own network interface ● can run stuff as root ● can have own sbin/init
- 13. Low level approach: chroot on steroids ● can also not have its own sbin/init ● container = isolated process(es) ● share kernel with host ● no device emulation
- 14. Separation of concerns Inside: ● code ● libs ● package manager ● app ● data Outside: ● logging ● remote access ● network configuration ● monitoring
- 15. Build once - run everywhere! Linux containers is units of software development ● run everywhere ○ regardless of kernel version ○ regardless of host distro ○ BUT container and host architecture must match ● run anything ○ if you can run it on host - you can run in the container ○ e.g. if it can run on Linux kernel, it can run
- 17. Virtualization Advantages: ● Multiple OS on same machine ● Easy maintenance and recovery ● Lower total cost of ownership Disadvantages: ● Multiple VMs Lead to Unstable performance ● Hypervisors are not as efficient as host OS ● Long boot process
- 18. Containerization Advantages over virtualization: ● Containers on same OS kernel are lighter and smaller ● Better resource utilization ● Short boot-up process
- 19. Resource/Memory Utilization 16Gb 3Gb 2Gb 1Gb 4Gb 4Gb2Gb 16Gb 3Gb 4Gb 2Gb VM Containers 7 Gb of Memory blocked and cannot be used for new VMs
- 21. Containerd - industry-standard container runtime with an emphasis on simplicity, robustness and portability. It is available as a daemon for Linux and Windows, which can manage the complete container lifecycle of its host system: image transfer and storage, container execution and supervision, low- level storage and network attachments, etc.. runC - CLI tool for spawning and running containers according to the OCI (Open Container Initiative) specification.
- 22. What is Docker? #2 Docker is containerization platform which packages your application and all its dependencies together in the form of containers so as to ensure that your application works in the same way in any environment be it Development or Test or Production
- 23. Why Docker? ● Isolation ● Lightweight ● Simplicity ● Workflow ● Community
- 24. Community
- 25. Community
- 26. Docker Adoption
- 27. Docker Adoption
- 28. Docker Adoption
- 30. Hello World! $ docker run hello-world
- 31. Any questions?
- 32. The end for today :)