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Use when managing Kubernetes resources including deployments, services, configmaps, and secrets.
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| name | kubernetes-resources |
| user-invocable | false |
| description | Use when managing Kubernetes resources including deployments, services, configmaps, and secrets. |
| allowed-tools | [] |
Understanding Kubernetes resource types and their relationships.
The smallest deployable unit in Kubernetes:
apiVersion: v1
kind: Pod
metadata:
name: my-pod
spec:
containers:
- name: app
image: nginx:1.21
Maintains a stable set of replica Pods:
apiVersion: apps/v1
kind: ReplicaSet
metadata:
name: my-replicaset
spec:
replicas: 3
selector:
matchLabels:
app: my-app
template:
# Pod template
Manages ReplicaSets and provides declarative updates:
apiVersion: apps/v1
kind: Deployment
metadata:
name: my-deployment
spec:
replicas: 3
strategy:
type: RollingUpdate
rollingUpdate:
maxSurge: 1
maxUnavailable: 0
# ...
Exposes Pods to network traffic:
apiVersion: v1
kind: Service
metadata:
name: my-service
spec:
type: ClusterIP
selector:
app: my-app
ports:
- port: 80
targetPort: 8080
HTTP/HTTPS routing to services:
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: my-ingress
spec:
rules:
- host: myapp.example.com
http:
paths:
- path: /
pathType: Prefix
backend:
service:
name: my-service
port:
number: 80
Cluster-level storage resource:
apiVersion: v1
kind: PersistentVolume
metadata:
name: my-pv
spec:
capacity:
storage: 10Gi
accessModes:
- ReadWriteOnce
persistentVolumeReclaimPolicy: Retain
storageClassName: standard
Request for storage:
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: my-pvc
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 5Gi
storageClassName: standard
Non-sensitive configuration data:
apiVersion: v1
kind: ConfigMap
metadata:
name: app-config
data:
config.json: |
{
"key": "value"
}
Sensitive information:
apiVersion: v1
kind: Secret
metadata:
name: app-secret
type: Opaque
stringData:
username: admin
password: secret123
For stateful applications:
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: web
spec:
serviceName: "nginx"
replicas: 3
selector:
matchLabels:
app: nginx
template:
# Pod template
volumeClaimTemplates:
- metadata:
name: www
spec:
accessModes: [ "ReadWriteOnce" ]
resources:
requests:
storage: 1Gi
Runs a Pod on every Node:
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: monitoring-agent
spec:
selector:
matchLabels:
name: monitoring-agent
template:
# Pod template
Run-to-completion tasks:
apiVersion: batch/v1
kind: Job
metadata:
name: batch-job
spec:
template:
spec:
containers:
- name: job
image: busybox
command: ["echo", "Hello"]
restartPolicy: Never
backoffLimit: 4
Scheduled jobs:
apiVersion: batch/v1
kind: CronJob
metadata:
name: scheduled-job
spec:
schedule: "0 0 * * *"
jobTemplate:
spec:
template:
spec:
containers:
- name: job
image: busybox
command: ["echo", "Daily task"]
restartPolicy: OnFailure
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