"[WORKSHOP] K8S for developers", Denis Romanuk
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"It seems that perfection is attained, not when there is nothing more to add, but when there is nothing more to take away." - Antoine de Saint Exupéry We can talk a lot about Kubernetes. But does the whole info is really need for just begining? Let's take away everything, except the really needed, and show a way for ones, who still uses only docker. Let's consider: Why do developers need Kubernetes and what does it looks like? An attempt to automate ops, or why does it was a reinvention of Kubernetes What does kube consists of? How to get a Kubernetes? From docker-compose to c What is a Helm and why it's difficult without one? What is "local development on Kubernetes"? CRD & Operators
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"[WORKSHOP] K8S for developers", Denis Romanuk
- 2. Denis Romaniuk ➔ Private and Public Cloud ➔ Dedicated and Managed servers ➔ Content Delivery Network (CDN) ➔ Servers management and Colocation ➔ DevOps as a service ➔ Managed Kubernetes (alpha-version) ➔ Managed Load Balancer (coming soon) AdvancedHosting Custom infrastructure for highload projects We use modern equipment, apply cutting-edge technologies, and ensure quality control to save time on technical aspects when working on the project. We design, create, and support infrastructure tailored to your specific needs, allowing you to concentrate on your business development. We help businesses cover all their needs in infrastructure services: from servers to fast content delivery worldwide.
- 3. Denis Romaniuk Table of contents Kubernetes for developers 1. Motivation 2. Evolution 3. Components 4. Helm 5. Installation 6. Local development 7. CRD and Operators
- 6. Denis Romaniuk Why do developers need Kubernetes? ● In-team relations ● Kubernetes is successor to Docker ● Kubernetes-native apps development ● Unified interface for any infrastructure
- 29. Denis Romaniuk docker User Interface High-level library Low-level library Container ● manages and runs containers ● pushes and pulls images ● manages storage ● manages networking ● supervises the running of containers ● actually creates and runs containers ● intercommunicate with user containerd docker-cli runc cgroups
- 30. Denis Romaniuk kubernetes ● manages and runs containers ● pushes and pulls images ● manages storage ● manages networking ● supervises the running of containers ● actually creates and runs containers ● intercommunicate with user containerd docker-cli runc cgroups kubernetes
- 31. Denis Romaniuk kubernetes ● manages and runs containers ● pushes and pulls images ● manages storage ● manages networking ● supervises the running of containers ● actually creates and runs containers containerd runc cgroups kubernetes 1.20+
- 32. Denis Romaniuk
- 36. Denis Romaniuk Volume ● EmptyDir ● ConfigMap ● Secret ● PersistentVolume /var/www/uploads .my.cnf /var/lib/mysql
- 37. Denis Romaniuk Volume ● EmptyDir ● ConfigMap ● Secret ● PersistentVolume .my.cnf /var/www/uploads /var/lib/mysql file https://stackoverflow.com/a/36925553/7427923 https://learn.hashicorp.com/tutorials/vault/kubernetes-external-vault https://kubernetes.io/docs/tasks/administer-cluster/encrypt-data/
- 38. Denis Romaniuk Volume ● EmptyDir ● ConfigMap ● Secret ● PersistentVolume .my.cnf /var/www/uploads /var/lib/mysql
- 39. Denis Romaniuk Mode: ● ReadWriteOnce ● ReadOnlyMany ● ReadWriteMany User Admin PersistentVolume Size: ● 1 GiB ● 10 GiB ● 100 GiB StorageClass: ● hdd ● ssd ● nvme
- 40. Denis Romaniuk ● 10 GiB ● RWO ● ssd Mode: ● ReadWriteOnce ● ReadOnlyMany ● ReadWriteMany PersistentVolume Size: ● 1 GiB ● 10 GiB ● 100 GiB StorageClass: ● hdd ● ssd ● nvme
- 43. Denis Romaniuk Recreate Deployment app app-d8sje04kvl app-89dff34kjp app-54k18dfjg8 app-54k18dfjg8-fd17e app-54k18dfjg8-9fdj4 app-54k18dfjg8-0fk3s app-d8sje04kvl-f4s6e app-d8sje04kvl-l8fhj app-d8sje04kvl-j73b6 app-89dff34kjp-s85jd app-89dff34kjp-ki87d app-89dff34kjp-g36dl Rolling Update v0.5 v0.6 v0.7
- 45. Denis Romaniuk CronJob 0 0 * * *
- 51. Denis Romaniuk Ingress Physical Layer Data Link Layer Network Layer Transport Layer Session Layer Presentation Layer Application Layer https://example.com/ 192.168.68.91 192.168.71.15 https://example.com/blog 192.168.95.11 https://example.com/shop 192.168.68.15 192.168.71.23 192.168.95.40 TCP/UDP HTTP 10.0.151.16 192.168.68.91 192.168.71.15 10.0.58.20 192.168.95.11 10.0.214.76 192.168.68.15 192.168.71.23 192.168.95.40
- 54. Denis Romaniuk Some project php-fpm nginx mysql redis IngressController
- 55. Denis Romaniuk Some project php-fpm nginx mysql redis IngressController
- 56. Denis Romaniuk Some project php-fpm nginx mysql redis IngressController
- 57. Denis Romaniuk Some project php-fpm nginx mysql redis IngressController nginx-we8df0d3-fj9d3 nginx-we8df0d3-8gj47 php-fpm-kf8dp439-mfg70 php-fpm-kf8dp439-d7n34 mysql-0 mysql-1 redis-1 redis-0 ingress-controller-89fsd
- 58. Denis Romaniuk Some project php-fpm nginx mysql redis nginx-we8df0d3-8gj47 php-fpm-kf8dp439-d7n34 mysql-1 redis-0 IngressController
- 59. Denis Romaniuk Some project php-fpm nginx mysql redis nginx-we8df0d3-8gj47 php-fpm-kf8dp439-d7n34 mysql-1 redis-0 nginx php-fpm mysql redis ingress nginx-we8df0d3-fj9d3 php-fpm-kf8dp439-mfg70 mysql-0 redis-1
- 60. Denis Romaniuk Manifests Some project Resources Workload nginx-we8df0d3-8gj47 php-fpm-kf8dp439-d7n34 mysql-1 redis-0 nginx php-fpm mysql redis ingress nginx-we8df0d3-fj9d3 php-fpm-kf8dp439-mfg70 mysql-0 redis-1
- 63. Denis Romaniuk Users namespace release name Helm + golang template values.yaml = helm-chart + values.yaml = Manifests Release parameters + Vendors
- 64. Denis Romaniuk Helm + golang template values.yaml = helm-chart + values.yaml = Manifests Release parameters + Source code Config Profit Artifact
- 66. Denis Romaniuk K8S update logging/monitoring auth/security Cloud-native solutions Manifests deployment (incl. Helm) CRI, CNI, CSI, etc... API-server, etcd, kubelets VPS and private networks
- 69. Denis Romaniuk Development solutions Production Development Scale Availability Access
- 70. Denis Romaniuk Development solutions minikube ● Kubernetes community ● OS-agnostic ● Creates VM or Container microk8s ● Canonical community ● OS-agnostic ○ Snap store ● Uses process manager k3s ● Rancher community ● Linux ○ Platform-agnostic ● Embeded-binaries
- 73. Denis Romaniuk CRD and Operators
- 74. Denis Romaniuk cert-manager Order Challenge Certificate Issuer CertificateRequest CSR-request ACME certificate order HTTP challenge DNS challenge Operator
- 75. Denis Romaniuk Vanilla kubernetes objects Custom Resource Definitions ACME Only cert-manager Order Certificate Issuer CertificateRequest Operator Challenge
- 76. Denis Romaniuk
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