Managing kubernetes deployment with operators
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The document outlines a presentation on managing Kubernetes application deployment using Helm and Operators, led by Damian Igbe, a certified Kubernetes administrator. It covers key concepts such as Kubernetes architecture, application management, extending Kubernetes with Operators, and includes a demo of creating and managing Kubernetes objects. The presentation emphasizes the differences between Helm and Operator, highlighting their complementary roles in deploying stateless and stateful applications respectively.
Managing kubernetes deployment with operators
- 1. @Copyright, Cloud Technology Experts Inc@Copyright, Cloud Technology Experts Inc Managing your Kubernetes Application Deployment with Helm and Operator
- 2. @Copyright, Cloud Technology Experts Inc Hello! I am Damian Igbe, PhD ● Certified Kubernetes Administrator (CKA), AWS Certified Solutions Architect, Developer and SysOps. CCNA, CCIE (Theory), Linux LPI-levels 1 and 2 ● Several years as a Technical Trainer ● CTO of Cloud Technology Experts ● Loves Running, at least one Marathon every year (if no pandemic J) ● One of the organizers of this meetup https://www.meetup.com/Kubernetes- and-Cloud-Native-North-Dallas/ ● You can find me at [email protected]
- 3. @Copyright, Cloud Technology Experts Inc Main Objective • Get you to be aware of the K8S application deployment tools: YAML, Helm, Operator • Know their Capabilities • Help clarify the differences between them
- 4. @Copyright, Cloud Technology Experts Inc The Agenda • Kubernetes Architecture Review • Managing Kubernetes Applications • Extending Kubernetes the Operator Way • Custom Resource Definitions (CRD) • Controllers • Demo: Using the ETCD Operator • Writing your Own Operators • Conclusion
- 5. @Copyright, Cloud Technology Experts Inc The K8S Architecture • Ref: Kubernetes Docs
- 6. @Copyright, Cloud Technology Experts Inc The Service Object
- 7. @Copyright, Cloud Technology Experts Inc Demo: The K8S Cluster • Show the Cluster • The K8S control plane components
- 8. @Copyright, Cloud Technology Experts Inc Managing Kubernetes • Traditional Way • Kubectl • Kubernetes DashBoard • Kubernetes the OS of the Cloud • Helm - Stateless • Operator - Stateful
- 9. @Copyright, Cloud Technology Experts Inc Demo: Creating Objects in K8S • Show the Creation of Pod (orphan Pod) using kubectl and Kubernetes Dashboard • Show using ReplicatSets and Deployment objects as a controller
- 10. @Copyright, Cloud Technology Experts Inc Extending Kubernetes With Operators • Automation Automation Automation • Operators are Robots • They have to do specific jobs to every application e.g Prometheus Operators, etcd operator, MongoDB operator • They put the human knowledge into the Application: In coreOs words An operator is a controller that encodes human operational knowledge: how do I run and manage a specific piece of complex software.
- 11. @Copyright, Cloud Technology Experts Inc Control Loop
- 12. @Copyright, Cloud Technology Experts Inc Operator Definition • An Operator is an application-specific controller that extends the Kubernetes API to: • create, • configure, • and manage instances of complex stateful applications on behalf of a Kubernetes user. • It builds upon the basic Kubernetes resource and controller concepts but includes domain or application-specific knowledge to automate common tasks. Brandon Philips, Former CTO of CoreOS
- 13. @Copyright, Cloud Technology Experts Inc Operator Cont. • An Operator builds upon the basic Kubernetes resource and controller concepts and adds a set of knowledge or configuration that allows the Operator to execute common application tasks. • For example, when scaling an etcd cluster manually: • a user has to perform a number of steps: • create a DNS name for the new etcd member, • launch the new etcd instance, • and then use the etcd administrative tools (etcdctl member add) to tell the existing cluster about this new member. • Instead with the etcd Operator a user can simply increase the etcd cluster size field by 1. Brandon Philips, former CTO of CoreOS
- 14. @Copyright, Cloud Technology Experts Inc DBA Operational Knowledge • Day-2 Operations • Failures and healing • Patches • Upgrades • Scaling • Reconfigure • Backups
- 15. @Copyright, Cloud Technology Experts Inc Demo: ETCD Operator • Before doing the exercises, first deploy ETCD Operator using Helm helm install stable/etcd-operator --generate-name • Create and Destroy • Resize • Failover • Rolling upgrade • Backup and Restore https://github.com/coreos/etcd-operator#create-and- destroy-an-etcd-cluster
- 16. @Copyright, Cloud Technology Experts Inc Deploying Applications on Kubernetes Which one should I use? • They complement each other • Helm mostly for direct installation of stateless apps • Operator mostly for automation of day-2 operations of stateful apps • Helm for installing Operators https://cloudblogs.microsoft.com/opensource/2020/04/02/when-to- use-helm-operators-kubernetes-ops/ https://coreos.com/blog/introducing-operators.html
- 17. @Copyright, Cloud Technology Experts Inc Writing an Operator • You can write an Operator for your application • You can use SDKS 1. Operator Framework • https://github.com/operator-framework • Operator SDK: • https://github.com/operator-framework/operator-sdk 2. Kubebuilder • https://github.com/kubernetes-sigs/kubebuilder • https://book.kubebuilder.io/cronjob-tutorial/controller- implementation.html
- 18. @Copyright, Cloud Technology Experts Inc@Copyright, Cloud Technology Experts Inc The End