The Cloud Convergence: OpenStack and Kubernetes.

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The Cloud Convergence: OpenStack and Kubernetes.

Ihor DvoretskyiOperations Engineer


Murano: An OpenStack App Management Tool

● The Application catalog - a single-point to publish different ready-to-use applications

● The Murano Project introduces an application catalog to OpenStack, enabling application developers and cloud administrators to publish various cloud-ready applications in a browsable categorized catalog.

● Murano ready-to-use applications are being published on Community App Catalog - http://apps.openstack.org, source code is being published on GitHub - https://github.com/openstack/murano.

● Murano provides possibility to to be abstract from underlying IaaS resources● Murano supports multiple OS options (Linux & Windows)

http://apps.openstack.org

https://github.com/openstack/murano


Murano Architecture

● Murano Dashboard (UI)○ Uses python murano client to call

Murano API● Murano API

○ Exposes REST API○ Sends tasks to the engine using

RabbitMQ● Murano Engine

○ Listens for tasks on RabbitMQ○ Sends API calls to Heat API○ Sends tasks to agents via

RabbitMQ● Murano Agent

○ Is located on guest VM’s○ Listens for tasks from RabbitMQ○ Returns results back to Murano

engine using RabbitMQ


Containers: benefits of usage

● Container - is a lightweight isolation technology that allows users to launch

applications in an isolated environment on Linux

● Containers usage is a totally different way of application management

● Containers have the huge benefits, that should be the perfect reasons to

prefer them over the alternative technologies:

○ Performance

○ Repeatability

○ Isolation

○ Portability


Containers - are not VMs

Containers VMs

Primary use case Containers are build for managing applications, but not the infrastructure

VM management solution has capabilities for managing the infrastructure (network, compute, storage etc.)

Guest OS support For production environments only Linux might be used natively

Any common operating system

Performance Containers do not incur performance overhead

VMs incur performance overhead

Security and isolation Containers are using the shared kernel - that’s not a full isolation

VMs are fully isolated, any kind of failure will not affect other VM

Application management Containers are managed as a code and do need specific management software (e.g. Kubernetes)

VMs are managed as the fully-loaded machines


Kubernetes as a container orchestration tool

● The predecessor of Kubernetes was the “Borg” container

orchestration tool, originally developed by Google.

● All the best ideas from Borg were incorporated into

Kubernetes, that is open sourced and is available for

everyone and runs everywhere

● Kubernetes is a container orchestrator that runs containers

and supports various underlying environments


Kubernetes components

Kubernetes consists of the following main components:

● Cluster - a set of nodes used by Kubernetes to run applications

● Node - a virtual or physical machine, where Kubelet is runned and where pods

can be created

● Pod - the smallest unit of Kubernetes - a colocated group of applications,

running the same context (e.g. - “Webserver”)

● Replication Controller - a loop that drives current state towards expected state

● Service - a set of running pods that run together (e.g. - load-balanced backends)

● Labels - identifying metadata attached to their objects (dev vs prod)


Kubernetes Multi-Node Architecture


Kubernetes & Murano Summary

● Docker provides:○ The benefits of containers usage

● Kubernetes provides:○ Portability, isolation from the underlying layers (infrastructure)○ Container management, service discovery, load balancing

● Murano provides:○ Ready-to-install applications○ Cluster management○ Infrastructure automation and autoscaling options○ Application catalogue

● OpenStack provides:○ Infrastructure as a Service layer for everything above


Demo

Demo deployment of Kubernetes cluster on OpenStack using Murano

The Cloud Convergence: OpenStack and Kubernetes.

Technology

Transcript of The Cloud Convergence: OpenStack and Kubernetes.