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1. Docker Introduction.pdf
- 2. Agenda In this session, you will learn about: • Overview of Compute Service • Virtualization Vs Containerization • What is Docker? • Why Docker Containers? • Docker Terminologies • Docker Editions
- 3. Overview of Compute Service • Bare Metal Infrastructure • Virtualized Infrastructure • Containerized Infrastructure
- 4. Bare-Metal Servers • Bare-metal servers are 'physical' servers. Which is a single-tenant physical server.
- 5. Disadvantages of Bare-Metal Servers • One-App One-Server • More expensive (hardware level) • Mis-match of capacity • Expensive maintenance
- 6. What is Virtualization? • Virtualization is the technique of virtualizing the underlying Infrastructure, such as Memory, CPU, Storage… • Guest operating systems run on top of a Host operating system (Hypervisor). • We can run different flavors of operating systems in different virtual machines all running on the same Infrastructure. • Virtualization eliminates the need for extra hardware resource. Hardware (CPU,Memory,Disk I/O ,Network) Host Operating System (Tyep-2) Hypervisor (KVM, Hyper-V, VirtualBox, ESX/ESX-i) Guest Virtual Hardware 1 Guest Virtual Hardware 2 Guest Operating System 1 Guest Operating System 2 Application 1 Application 2 Virtual Machine 1 Virtual Machine 2 Bins/Libs Bins/Libs
- 7. Hypervisors • Hypervisor: A hypervisor allows one host computer to support multiple guest VMs by virtually sharing its resources, such as Memory, CPU and Storage. • Types of Hypervisor: • Type-1 Hypervisors – Runs directly on top of Hardware. • KVM, Xen, Hyper-V, ESX/ESXi… • Type-2 Hypervisors – Runs on top of Host OS. • Oracle VB, VMware Workstation…
- 8. Hypervisors… Guest OS VM Guest OS VM Hypervisor Hardware Type 1 Hypervisor (Bare-Metal Architecture) Guest OS VM Guest OS VM Hypervisor Hardware Host OS Type 2 Hypervisor (Hosted Architecture)
- 9. VMs are great, but they’re far from perfect! • Each guest OS will have its own kernel and set of libraries and dependencies. • Since each VM includes an OS and a virtual copy of all the hardware the OS requires, VMs require significant RAM and CPU resources. • VMs incur a lot of overhead beyond what is being consumed by your application logic. • Since each VM has its own dedicated OS, License cost is involved. • Patching, Upgrades, Security, Hardening requires larger team and time. • Boot up process is longer and takes more time.
- 10. Containerization • Containers are a method of operating system level virtualization. • Containers allow you to run an application and its dependencies in resource-isolated processes. • No guest OS overhead and utilizes a host’s operating system. • Containers share relevant OS libraries & resources as and when needed unlike virtual machines. • Containers are Lightweight and Faster than Virtual Machines. Hardware (CPU,Memory,Disk I/O ,Network) Host Operating System (Must) App1 App2 App3 C1 C2 C3 App4 C4 App5 C5 App6 C6 CRI ( Docker, containerd, CRI-O) Bins/Libs Bins/Libs Bins/Libs Bins/Libs Bins/Libs Bins/Libs
- 11. APP1 CONTAINER1 HOSTNAME IP ADDRESS DISK APP2 CONTAINER2 HOSTNAME IP ADDRESS DISK Operating System Computer What is Container? A container is the same idea as a physical container—think of it like a box with an application in it. Hostname IP Address Disk CPU Memory Docker Each Container has its own Computer Name, IP address and Disk …
- 12. Virtualization vs Containerization Hardware (CPU,Memory,Disk I/O ,Network) Host Operating System (Tyep-2) Hypervisor (KVM, Hyper-V, VirtualBox, ESX/ESX-i) Hardware (CPU,Memory,Disk I/O ,Network) Host Operating System (Must) CRI ( Docker, containerd, CRI-O) Guest Virtual Hardware 1 Guest Virtual Hardware 2 Guest Operating System 1 Guest Operating System 2 Application 1 Application 2 Virtual Machine 1 Virtual Machine 2 Bins/Libs Bins/Libs C4 C5 C6 App1 App2 App3 C1 C2 C3 App4 App5 App6 Bins/Libs Bins/Libs Bins/Libs Bins/Libs Bins/Libs Bins/Libs
- 13. Virtualization • Method of Hardware level Virtualization • Each VM needs dedicated Guest OS • Larger in size • Dedicated Kernel • Each VM will have its own Libraries and Binaries • Longer boot process • Takes more time for creating • Consumes more resources • Migrating virtualized application is challenging due to hardware incompatibility Containerization • Method of OS level Virtualization • Containers share host machine OS • Smaller in size • Share the Host kernel • Share relevant Libraries and Binaries • Shorter boot process • Takes Few seconds • Consume less resources • Migrating Containerized application is much easier
- 14. What is Docker? • Docker, Inc. – The company • Docker the technology • Docker is an open source platform for developing, shipping, and running applications. • Docker enables you to separate your applications from your infrastructure so you can deliver software quickly. • Docker manages the lifecycle of the container. • The use of containers to deploy applications is called containerization.
- 15. History of Docker Inc. • Developed using Linux core components, in 2013. • It was developed as an internal project at a platform-as-a-service company called dotCloud and later renamed as Docker.
- 16. APP1 Libraries APP1 Libraries Container 1 Container 2 Docker Engine Host OS Docker Terminologies • Runs Application within docker Container • Alternative to VMs & use host’s OS 3 Terminologies to remember • Docker image is build using dockerfile • Dockerfile contain all the application dependencies • Docker container is an instance of a docker image
- 17. Docker File Docker image Docker Container Docker Hub Staging Server Container Production Server Container Virtual Machine How Docker Works?
- 18. Docker Editions • Docker Community Edition (CE) is ideal for individual developers and small teams looking to get started with Docker and experimenting with container- based apps. • Docker Enterprise Edition (EE) is designed for enterprise development and IT teams who build, ship, and run business critical applications in production at scale. Renamed as MKE – Nov 2019