Downloaded 27 times
![Version-Controlled Infrastructure
FROM multicloud/jre-8-oracle
ENV version 4.1.1-linux-x64
ENV elasticsearch_server_url elasticsearch
ENV elasticsearch_server_port 9200
RUN wget --no-check-certificate --progress=bar:force --retry-connrefused -t 5 https://download.elasticsearch.org/kibana/kibana/kibana-${version}.tar.gz
-O /tmp/kibana.tar.gz &&
(cd /tmp && tar zxf kibana.tar.gz && mv kibana-* /opt/kibana &&
rm kibana.tar.gz)
ADD entrypoint.sh /entrypoint.sh
RUN chmod a+x /entrypoint.sh
EXPOSE 5601
ENTRYPOINT ["/entrypoint.sh"]](https://image.slidesharecdn.com/kubernetescodencoffe-180402081336/75/Kubernetes-CI-CD-11-2048.jpg)
![Docker challenges
• Service discovery
• Load balancing
• Multi-host Docker containers deployment
• Secrets/configuration/storage management
• Auto-[scaling/restart/healing] of containers and nodes
• Zero-downtime deploys](https://image.slidesharecdn.com/kubernetescodencoffe-180402081336/75/Kubernetes-CI-CD-23-2048.jpg)
![Pod Template
apiVersion: v1
kind: Pod
metadata:
name: myapp-pod
labels:
app: myapp
spec:
containers:
- name: myapp-container
image: busybox
command: ['sh', '-c', 'echo Hello Kubernetes! && sleep 3600']](https://image.slidesharecdn.com/kubernetescodencoffe-180402081336/75/Kubernetes-CI-CD-39-2048.jpg)
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Kubernetes: від знайомства до використання у CI/CD
This document provides a comprehensive overview of Kubernetes, its architecture, benefits, and how it integrates with CI/CD pipelines, particularly using GitLab. Key topics include the advantages of containerization, the components of the Kubernetes architecture, and the process of installing and using Kubernetes for automated DevOps. It also addresses challenges, features, and the overall purpose of using Kubernetes in modern software development and deployment.
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Kubernetes: від знайомства до використання у CI/CD
- 1. Kubernetes: from introduction tousage in CI/CD Oleksandr Zanichkovskyi
- 2. Oleksandr Zanichkovskyi PHP TechnicalLead with 14+ years of experience. Interested in clean code, good architecture, cloud computing, development processes automation and playing the guitar of course Email: eternity.lviv@gmail.com Skype: olexandr.zanichkovsky FB: https://www.facebook.com/ozanichkovskyi
- 3. Why shouldcontainers be used? What is Kubernetes Kubernetes Architecture Kubernetes Primitives Installing Kubernetes Additional Tools Automating DevOps with Kubernetes GitLab and Kubernetes integration Agenda
- 4.
- 5. Why should containersbe used?
- 6. The old wayvs the new way
- 7. What is container? “Acontainer image is a lightweight, stand-alone, executable package of a piece of software that includes everything needed to run it: code, runtime, system tools, system libraries, settings. … containerized software will always run the same, regardless of the environment. Containers isolate software from its surroundings, for example differences between development and staging environments and help reduce conflicts between teams running different software on the same infrastructure.” https://docker.com/what-container
- 8. Container advantages • Pre-MadeRuntime Environment
- 9.
- 10. Container advantages • Pre-MadeRuntime Environment • Version-Controlled Infrastructure
- 11. Version-Controlled Infrastructure FROM multicloud/jre-8-oracle ENVversion 4.1.1-linux-x64 ENV elasticsearch_server_url elasticsearch ENV elasticsearch_server_port 9200 RUN wget --no-check-certificate --progress=bar:force --retry-connrefused -t 5 https://download.elasticsearch.org/kibana/kibana/kibana-${version}.tar.gz -O /tmp/kibana.tar.gz && (cd /tmp && tar zxf kibana.tar.gz && mv kibana-* /opt/kibana && rm kibana.tar.gz) ADD entrypoint.sh /entrypoint.sh RUN chmod a+x /entrypoint.sh EXPOSE 5601 ENTRYPOINT ["/entrypoint.sh"]
- 12. Container advantages • Pre-MadeRuntime Environment • Version-Controlled Infrastructure • Runtime Consistency
- 13.
- 14. Container advantages • Pre-MadeRuntime Environment • Version-Controlled Infrastructure • Runtime Consistency • Isolation
- 15.
- 16. Container advantages • Pre-MadeRuntime Environment • Version-Controlled Infrastructure • Runtime Consistency • Isolation • Lighter than VMS
- 17.
- 18. Container advantages • Pre-MadeRuntime Environment • Version-Controlled Infrastructure • Runtime Consistency • Securable • Lighter than VMS • Continuous Integration/Continuous Delivery
- 19.
- 20. Container advantages • Pre-MadeRuntime Environment • Version-Controlled Infrastructure • Runtime Consistency • Securable • Lighter than VMS • Continuous Integration/Continuous Delivery • Scalability
- 21.
- 22. Scalability – ”docker-composescale web=3” Nginx reverse proxy web web web
- 23. Docker challenges • Servicediscovery • Load balancing • Multi-host Docker containers deployment • Secrets/configuration/storage management • Auto-[scaling/restart/healing] of containers and nodes • Zero-downtime deploys
- 24.
- 25. Meaning The name Kubernetesoriginates from Greek, meaning helmsman or pilot.
- 26.
- 27. Origins • First announcedby Google in mid-2014 • Kubernetes v1.0 was released in mid-2015 • Written in Go/Golang • https://github.com/kubernetes/kubernetes • Often shortened to k8s
- 28. What is Kubernetes? •We treat cluster of number of servers as single computer • We do not want to decide what server to put each app part on • We just want to let the cluster know the desired state in simple unified format • Up to: • 5000 nodes • 150000 total pods • 300000 total containers • 100 pods per node
- 29. Benefits • Agile applicationcreation and deployment: Increased ease and efficiency of container image creation compared to VM image use. • Continuous development, integration, and deployment: Provides for reliable and frequent container image build and deployment with quick and easy rollbacks (due to image immutability). • Dev and Ops separation of concerns: Create application container images at build/release time rather than deployment time, thereby decoupling applications from infrastructure. • Environmental consistency across development, testing, and production: Runs the same on a laptop as it does in the cloud. • Cloud and OS distribution portability: Runs on Ubuntu, RHEL, CoreOS, on-prem, Google Kubernetes Engine, and anywhere else. • Application-centric management: Raises the level of abstraction from running an OS on virtual hardware to run an application on an OS using logical resources. • Loosely coupled, distributed, elastic, liberated micro-services: Applications are broken into smaller, independent pieces and can be deployed and managed dynamically – not a fat monolithic stack running on one big single-purpose machine. • Resource isolation: Predictable application performance. • Resource utilization: High efficiency and density.
- 30. Do I needKubernetes? • Health checks • Replicating instances • Rolling updates • Accessing container logs • Service discovery • Load balancing
- 31. Is it difficultto use? • Different kinds of resources • Descriptive YAML • Easy to use API • Custom resources • Helm as package installer
- 32.
- 33.
- 34. Master API Server Component onthe master that exposes the Kubernetes API. It is the front-end for the Kubernetes control plane. etcd Consistent and highly-available key value store used as Kubernetes’ backing store for all cluster data. kube-scheduler Component on the master that watches newly created pods that have no node assigned, and selects a node for them to run on. kube-controller-manager Component on the master that runs controllers.
- 35. Node Kubelet An agent thatruns on each node in the cluster. It ensures that the containers on particular Node are running and healthy. Container Engine The container runtime is the software that is responsible for running containers. Kubernetes supports several runtimes: Docker, rkt, runc kube-proxy Enables the Kubernetes service abstraction by maintaining network rules on the host and performing connection forwarding.
- 36.
- 37. Kubernetes Resources • Pod •Replica Set • Deployment • Service • …
- 38. Pod Container 1 Container2 Volume 10.0.0.2app: name version: 1.0
- 39. Pod Template apiVersion: v1 kind:Pod metadata: name: myapp-pod labels: app: myapp spec: containers: - name: myapp-container image: busybox command: ['sh', '-c', 'echo Hello Kubernetes! && sleep 3600']
- 40.
- 41.
- 42.
- 43. ReplicaSet apiVersion: apps/v1 kind: ReplicaSet metadata: name:nginx-rs labels: app: nginx spec: replicas: 3 selector: matchLabels: app: nginx template: metadata: … spec: …
- 44.
- 45.
- 46. Deployment apiVersion: apps/v1 kind: Deployment metadata: name:nginx-deployment labels: app: nginx spec: replicas: 3 selector: matchLabels: app: nginx template: metadata: … spec: …
- 47.
- 48. Service POD app: nginx POD app: nginx POD app:nginx Service app: nginx
- 49. Service apiVersion: v1 kind: Service metadata: labels: app:nginx name: nginx-svc spec: ports: - nodePort: 30001 port: 80 protocol: TCP targetPort: 80 selector: app: nginx type: NodePort
- 50.
- 51.
- 52.
- 53. Ingress • Collection ofrules that allow inbound connections to reach cluster services
- 54. Ingress apiVersion: extensions/v1beta1 kind: Ingress metadata: name:nginx annotations: kubernetes.io/tls-acme: “true” spec: rules: - host: nginx.review.zophiatech.com http: paths: - path: / backend: serviceName: nginx-svc servicePort: 80
- 55.
- 56. Kube Lego? Cert-manager? Automatethe management and issuance of TLS certificates from various issuing sources.
- 57.
- 58. Persistent Storage? Rook! •Stateful containers • Managed by Kubernetes • Few minutes to install
- 59.
- 60.
- 61.
- 62.
- 63. Why bother withinstalling? • Try locally • Minikube • Kubeadm • Kubespray vagrant • Create your private cloud • Kubeadm • Kubespray
- 64. Minikube way • Itis as easy as: • Install minikube and kubectl • Run ‘minikube up’
- 65. Kubespray way • Itis as easy as: • Create ansible inventory file • Run ‘ansible-playbook -b -u sudouser -i inventory/inventory.cfg cluster.yml’
- 66.
- 67. Human factor • Mycode style seemed perfect • I expected that tests would pass • Copy pasting allowed to implement this quickly • …
- 68.
- 70.
- 71. Environment • Agnostic • Showsomething to your colleagues even remotely • Dev test your code • QA test • Get it as quickly as possible • …
- 72. What if itis not what you expected?
- 74.
- 75. CI out ofthe box
- 76.
- 77.
- 78.
- 79. Is it expensive? •Unlimited private repositories 10Gb each • 2000 CI minutes for free • Install CE if you want • Install separate runner
- 80.
- 81.
- 82.
- 83. I hope thiswil help you!
- 84. Resources • GitLab • Kubernetes •Rook • Install instructions (without Persistent Storage) • Kube Lego
- 85. USA HQ Toll Free:866-687-3588 Tel: +1-512-516-8880 Ukraine HQ Tel: +380-32-240-9090 Bulgaria Tel: +359-2-902-3760 Germany Tel: +49-69-2602-5857 Netherlands Tel: +31-20-262-33-23 Poland Tel: +48-71-382-2800 UK Tel: +44-207-544-8414 EMAIL info@softserveinc.com WEBSITE: www.softserveinc.com Thank you!
- 86. USA HQ Toll Free:866-687-3588 Tel: +1-512-516-8880 Ukraine HQ Tel: +380-32-240-9090 Bulgaria Tel: +359-2-902-3760 Germany Tel: +49-69-2602-5857 Netherlands Tel: +31-20-262-33-23 Poland Tel: +48-71-382-2800 UK Tel: +44-207-544-8414 EMAIL info@softserveinc.com WEBSITE: www.softserveinc.com Questions?