Introduction to docker - Paolo Foletto - Codemotion Tech Meetup Tour 2015 - Padova
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The document discusses Docker, a platform for developing, shipping, and running containerized applications. It describes how Docker uses container virtualization technology to provide lightweight isolation compared to traditional hypervisor-based virtual machines. Containers offer benefits like increased density, efficiency, and portability by running applications directly on the host operating system kernel and sharing resources. The Docker platform consists of multiple products and tools that manage containers and facilitate their use.
Introduction to docker - Paolo Foletto - Codemotion Tech Meetup Tour 2015 - Padova
- 1. CODEMOTION TECH MEETUP TOUR 2015 PADOVA 26/10 TALENT-LAB PAOLO.FOLETTO@GMAIL.COM
- 2. WHAT IS DOCKER? • DOCKER IS A PLATFORM FOR DEVELOPING, SHIPPING AND RUNNING APPLICATIONS USING CONTAINER VIRTUALIZATION TECHNOLOGY THE DOCKER PLATFORM CONSIST OF MULTIPLE PRODUCTS/TOOLS DOCKER ENGINE DOCKER HUB DOCKER MACHINE DOCKER SWARM DOCKER COMPOSE KITEMATIC
- 3. ONE APPLICATION ON ONE PHYSICAL SERVER Application Operating system Physical Server
- 4. PROBLEMS IN THE PAST • SLOW DEPLOYMENT TIMES • HUGE COSTS • WASTED RESOURCES • DIFFICULT TO SCALE • DIFFICULT TO MIGRATE • VENDOR LOCK IN Application Operating system Physical Server
- 5. HYPERVISOR-BASED VIRTUALIZATION • ONE PHYSICAL SERVER CAN CONTAIN MULTIPLE APPLICATIONS • EACH APPLICATION RUNS IN A VIRTUAL MACHINE (VM) V Application Guest Operating System VM V Application Guest Operating System VM V Application Guest Operating System VM Host Operating system Physical Server Hypervisor
- 6. BENEFIT OF VM • BETTER RESOURCE POOLING • ONE PHISICAL MACHINE DIVIDE INTO MULTIPLE VIRTUAL MACHINES • EASIER TO SCALE • VM’S IN THE CLOUD • RAPID ELASTICITY+ • PAY AS YOU GO MODEL
- 7. LIMITATIONS OF VMS • EACH VM STILLS REQUIRES • CPU ALLOCATION • STORAGE • RAM • AN ENTIRE GUEST OPERATING SYSTEM • THE MORE VM’S YOU RUN, THE MORE RESOURCES YOU NEEDS • GUEST OS MEANS WASTED RESOURCES • APPLICATION PORTABILITY IS NOT GUARANTEED
- 8. INTRODUCING CONTAINERS • EACH GUEST INSTANCE IS CALLED A CONTAINER • EACH CONTAINER HAS ITS OWN • ROOT FILESYSTEM • PROCESS • MEMORY • DEVICES • NETWORK PORTS Container based virtualizaiton uses the kernel on the host’s operating system to run multiple guest instances
- 9. CONTAINERS container Application container Application container Application Host Operating System Physical Server OS Kernel
- 10. CONTAINERS VS VMS • CONTAINERS ARE MORE LIGHTWHEIGHT • NO NEED TO INSTALL GUEST OS • LESS CPU, RAM, STORAGE SPACE REQUIRED • MORE CONTAINERS PER MACHINE THAN VMS • GREATER PORTABILITY
- 11. DOCKER AND THE LINUX KERNEL • DOCKER ENGINE IS THE PROGRAM THAT ENABLE CONTAINERS TO BE BUILT, SHIPPED AND RUN • DOCKER ENGINE USES LINUX KERNEL NAMESPACES AND CONTROL GROUPS • NAMESPACES GIVE US THE ISOLATED WORKSPACE container Application container Application container Application LINUX Operating System Phisical Server Linux Kernel DOCKER ENGINE