Kubernetes Introduction & Whats new in Kubernetes 1.6
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- Introduction to Kubernetes features - A look at Kubernetes Networking and Service Discovery - New features in Kubernetes 1.6 - Kubernetes Installation options To know more about our Kubernetes expertise, visit our center of excellence at: http://www.opcito.com/kubernetes/
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Kubernetes Introduction & Whats new in Kubernetes 1.6
- 1. 1 Kubernetes – Introduction and What’s new in 1.6 By Colwin Fernandes, Co-founder & CTO 27-April-2017
- 2. 2 Show of hands • Plan to use containers? • How many use containers? • Where do you use containers? • Development • Staging • Production
- 3. 3 Agenda • Introduction to Kubernetes features • A look at Kubernetes Networking and Service Discovery • New features in Kubernetes 1.6 • Kubernetes Installation options
- 4. 4 Kubernetes provides orchestration for containers along with scheduling and service discovery • Automate the deployment and replication of containers • Auto scaling of your containers - scale in or out containers on the fly • Organize containers in to groups and provide automatic load balancing between them via Labels • Easily roll out new versions of application containers and redirect traffic to the new versions • Provide container resilience, if a container dies it gets replaced via Replication Controllers Kubernetes - Features
- 6. 6 • Cluster • Set of nodes where Kubernetes is installed. Can be baremetal or VMs • Pods • Group of co-located containers representing an application • Smallest unit that can be scheduled within Kubernetes • Containers share the same network namespace within a Pod • Ephemeral not permanent • Labels • User defined key/value tags used to attach attributes to Pods • Used to group pods in to logical groups • Used by Replication controllers and Services to find Pods Kubernetes Core Concepts
- 7. 7 • Scheduler • Schedules pods to run on nodes • Global scheduler for long running jobs • Best fit chosen based on pod requirements • Pluggable • Replication Controllers • Ensure a certain number of Pods are running always • Replaces pods that die automatically • Can be used to scale up and down a set of labelled pods • Services • Defines a set of Pods and a policy to access them • Abstraction to allow transparent handling of the ephemeral nature of the Pods • Provides auto load balancing over a set of labelled pods Kubernetes Core Concepts contd -/
- 8. 8 Replication Controller in Action
- 9. 9 Replication Controller in Action
- 10. 10 Replication Controller in Action
- 11. 11 Replication Controller in Action
- 15. 15 • Replica Set • Next generation Replication Controller • Uses different selector support – Set based • Mainly used internally with Deployments • Deployments • Used to update Pods and Replica Sets • Can create new resources or update existing resources • Rate of update can be controlled. So, you get a rolling update across all your containers • Allows rolling back of updates, can stop a bad deployment automatically Replica Sets and Deployment Sets
- 16. 16 • Stateful Sets • Provides a unique identity to pods • Useful when you need stable network ids, persistent storage • Ordered deployment scaling and termination • Pod Identity persists over pod reschedules • Daemon Sets • Used to run a pod on all (or some) Nodes • Primarily used to run storage, log collection or node monitoring deamons Stateful Sets and Daemon Sets
- 17. 17 • Node • A node is a worker machine in Kubernetes • May be a VM or physical machine • Runs the following services • Container Runtime (Docker, Rkt) • Kubelet • Kube-proxy • Kubernetes Master • Unified view of the cluster • Runs API server • Controllers like Replication, StatefulSet , ReplicaSet, DeamonSet, Deployment live here Kubernetes Master and Nodes(Minions)
- 21. 21 Docker Networking contd -/
- 22. 22 Docker Networking contd -/
- 24. 24 • Kubernetes creates Docker Link compatible environment variables in all Pods • Containers can use the environment variable to talk to the service endpoint Service Discovery – Environment variables
- 25. 25 • The DNS server watches Kubernetes API for new Services • The DNS server creates a set of DNS records for each Service • Services can be resolved by the name within the same namespace • Pods in other namespaces can access the Service by adding the namespace to the DNS path • my-service.my-namespace Service Discovery – DNS
- 30. 30 • Scale and Federation • 5000 nodes (150,000 pods) • etcd v3 • Federation for multiple clusters via kubefed • Security • RBAC • Permissions can be scoped on a per name-space basis • Control plane components • Nodes • Controllers What’s new in 1.6?
- 31. 31 • Advanced Scheduling • Node affinity/anti-affinity • Taints and tolerations • Pod affinity/anti affinity • Multiple schedulers • Dynamic Storage provisioning • No need to pre-provision, create and delete on demand • Default installation of Storage class for AWS, Azure, GCP, OpenStack and vSphere • Expanded range of storage, including user-written PV provisioners What’s new in 1.6?
- 32. 32 • Per pod eviction • In case of node problems combined with tolerationSeconds, lets users tune the duration a pod stays bound to a node that is experiencing problems • Pod Injection Policy • Adds a new API resource PodPreset to inject information such as secrets, volumes, volume mounts, and environment variables into pods at creation time • Custom Metrics support in the Horizontal Pod Autoscaler What’s new in 1.6? – Alpha features
- 33. 33 • Kubeadm • Ships with Kubernetes • Assumes machines are up and running • Integrates with your existing orchestration system • GCE • One click ready to use clusters • Kops • Fully automated installation • Uses DNS to identify clusters • Self-healing: everything runs in Auto-Scaling Groups • Limited OS support (Debian preferred, Ubuntu 16.04 supported, early support for CentOS & RHEL) • High-Availability support • Can directly provision, or generate terraform manifests Kubernetes Installation
- 34. 34 Thank You