Using Jenkins always means dealing with all kinds of plugins. To practice DevOps better, we should also be capable of developing plugins ourselves, so the whole process can converge inside Jenkins. 1. Jenkins Plugins 1.1 The Plugin Ecosystem Jenkins’ predecessor Hudson started in 2004, and 16 years on it is still a mainstream CI/CD engine.

1. The Scheduler in Kubernetes kube-scheduler is the component in Kubernetes that decides which Node a Pending Pod runs on; it is called the scheduler. Kubernetes ships with a large number of built-in scheduling policies and also provides some advanced scheduling policies (nodeAffinity, podAffinity, and so on) for users, which

1. Introduction to Velero Velero is an open-source Kubernetes cluster backup and migration tool from the heptio team (acquired by VMWare). Velero stores cluster resources in object storage. It supports AWS, Azure, and GCP object storage by default, is compatible with the S3 protocol, and can be extended to other platforms such as Aliyun OSS through plugins.

A Deployment controls the number and state of Pods by creating ReplicaSets. This post mainly introduces some common Deployment operations. 1. Deployment yaml Format Passing the --dry-run flag means the command is not actually executed, only YAML output is generated: 1 kubectl create deployment nginx --image=nginx --dry-run -o yaml apiVersion: apps/v1 kind: Deployment metadata: creationTimestamp: null labels: app: nginx name: nginx spec: replicas: 1 selector: matchLabels: app: nginx strategy: {} template: metadata: creationTimestamp: null labels: app: nginx spec: containers: - image: nginx name: nginx resources: {} status: {} 2.

With the Operator approach, Kubernetes functionality can be extended in a friendly way. Operator = CRD + Controller. First you generate the CRD from a yaml definition, then the Controller continuously watches the data in etcd and performs the corresponding actions. There is a lot of tedious and repetitive work involved in developing an Operator.