Docker & Kubernetes intro
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A short lap around Docker and Kubernetes concepts
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Docker & Kubernetes intro
- 1. Docker and Kubernetes (an intro) Arnon Rotem-Gal-Oz
- 6. So what is Docker then?
- 7. What are the basics of the Docker system? Source Code Repository Dockerfile For A Docker Engine Docker Container Image Registry Build Docker Host 2 OS (Linux) ContainerA ContainerB ContainerC ContainerA Push Search Pull Run Host 1 OS (Linux) http://www.slideshare.net/dotCloud/docker-intro-november
- 8. Changes and Updates Docker Engine Docker Container Image Registry Docker Engine Push Update Bins/ Libs App A AppΔ Bins/ Base Container Image Host is now running A’’ Container Mod A’’ AppΔ Bins/ Bins/ Libs App A Bins/ Bins/ Libs App A’’ Host running A wants to upgrade to A’’. Requests update. Gets only diffs Container Mod A’ http://www.slideshare.net/dotCloud/docker-intro-november
- 10. Work on my machine…
- 13. Is a Distributed Operating System for your code
- 14. 1. OS as an extended machine 2. OS as a Resource Manager
- 15. What we get • Scaling • Discovery • Load balancing and routing • Monitoring • Configuration
- 17. Azure/AWS/Google/AliCloud all have managed Kubernetes offerings
- 18. Pod • A deployment unit • one or more containers • Shared storage volumes • Shared IP (i.e. access via localhost) and port space • Deployed together (co-located, co-scheduled) • Ephemeral (reschedule new instance, not rerunning an ”old” instance)
- 19. network Init container 2 Init container 1 container 1 container 2 POD
- 20. Side-car pattern (edge component)
- 21. • Job • CronJob • StatefulSet • DeamonSet • Deployment • Replicaset
- 24. Service • Set of Pods • An access policy (session affinity, port, external port etc.) • Provides a stable endpoint for other services http://kubernetes.io/docs/user-guide/services/
- 28. And there’s a lot more…
Editor's Notes
- Platform for managing Linux Containers API for image management Builds on cgroup and namespacing Built in Go Includes an image specification and container specification (namespaces, filesystem resources etc.) (DockerFile)
- Container = OS level virtualization - a lightweight VM Not duplicating the whole OS for each ”machine”
- Namespaces (mounts, PIDs etc.) Cgroups (CPU, Memory, Disk) Chroot (file system) Seccomp (computation)
- Platform for managing Linux Containers API for image management Builds on cgroup and namespacing Built in Go Includes an image specification and container specification (namespaces, filesystem resources etc.) (DockerFile)
- Opinionated Platform for hosting containers (not just docker) Provides container grouping, load balancing, healing, scaling etc. Started by Google based on their internal concepts One of several options in the market killing all the rest Others include Docekr Swarm, Mesos etc.
- Opinionated Platform for hosting containers (not just docker) Provides container grouping, load balancing, healing, scaling etc. Started by Google based on their internal concepts One of several options in the market killing all the rest Others include Docekr Swarm, Mesos etc.
- Opinionated Platform for hosting containers (not just docker) Provides container grouping, load balancing, healing, scaling etc. Started by Google based on their internal concepts One of several options in the market killing all the rest Others include Docekr Swarm, Mesos etc.
- Kubelet – Node agent Holds PodSpecs Performs probes on containers ExecAction: Executes a specified command inside the Container. The diagnostic is considered successful if the command exits with a status code of 0. TCPSocketAction: Performs a TCP check against the Container’s IP address on a specified port. The diagnostic is considered successful if the port is open. HTTPGetAction: Performs an HTTP Get request against the Container’s IP address on a specified port and path. The diagnostic is considered successful if the response has a status code greater than or equal to 200 and less than 400. Kube controller Node controller: Responsible for noticing and responding when nodes go down. Replication controller: Responsible for maintaining the correct number of pods for every replication controller object in the system. Endpoints controller: Populates the Endpoints object (that is, joins Services & Pods). Service Account & Token controllers: Create default accounts and API access tokens for new namespaces. Cloud controller – api to specific clouds
- Init containers run in a chain to completion (must end) one after the other Can be used to ensure pre-requisites are met Can have different permissions that the containers that run in the pod Lifecycle, livenessProbe, readinessProbe,startupProbe
- Extend the event loop