k8s

Author: georgeyk

kube/.envrc

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+use nix
+
+minikube config set driver docker
+minikube status >/dev/null 2>&1 || minikube start
+
+echo -e "\033[31mminikube automatically started.\033[0m"
+echo -e "\033[31mRemember to manually stop minikube before exiting. 'minikube stop'\033[0m"
+echo -e "\033[31mHelper: alias k='minikube kubectl --'\033[0m"

kube/100/nginx.yaml

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+apiVersion: v1
+kind: Pod
+metadata:
+  name: nginx
+spec:
+  containers:
+    - name: nginx-container
+      image: nginx

kube/200/bad-release.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: appname
+
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: appname
+
+  template:
+    metadata:
+      labels:
+        app: appname
+
+    spec:
+      containers:
+        - name: nginx-container
+          image: nginx
+          # this should fail
+          readinessProbe:
+            periodSeconds: 1
+            successThreshold: 5
+            httpGet:
+              path: /foo
+              port: 80

kube/200/dep-surge-and-unavailable.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: appname
+
+spec:
+  replicas: 3
+
+  strategy:
+    rollingUpdate:
+      maxSurge: 1
+      maxUnavailable: 1
+
+  selector:
+    matchLabels:
+      app: appname
+
+  template:
+    metadata:
+      labels:
+        app: appname
+
+    spec:
+      containers:
+        - name: nginx-container
+          image: nginx

kube/200/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: appname
+
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: appname
+
+  template:
+    metadata:
+      labels:
+        app: appname
+
+    spec:
+      containers:
+        - name: nginx-container
+          image: nginx

kube/200/healthy-check.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: appname
+
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: appname
+
+  template:
+    metadata:
+      labels:
+        app: appname
+
+    spec:
+      containers:
+        - name: nginx-container
+          image: nginx
+          livenessProbe:
+            httpGet:
+              path: /
+              port: 80

kube/200/new-version.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: appname
+
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: appname
+
+  template:
+    metadata:
+      labels:
+        app: appname
+
+    spec:
+      containers:
+        - name: nginx-container
+         # just pretend is a new version of an app...
+          image: caddy

kube/200/scale-to-5.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: appname
+
+spec:
+  replicas: 5
+  selector:
+    matchLabels:
+      app: appname
+
+  template:
+    metadata:
+      labels:
+        app: appname
+
+    spec:
+      containers:
+        - name: nginx-container
+          image: nginx

kube/300/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: appname
+
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: appname
+
+  template:
+    metadata:
+      labels:
+        app: appname
+
+    spec:
+      containers:
+        - name: nginx-container
+          image: nginx

kube/300/service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: appname-svc
+
+spec:
+  type: NodePort
+  selector:
+    app: appname
+
+  ports:
+    - port: 80
+      nodePort: 30001

kube/400/config-file.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: appname
+
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: appname
+
+  template:
+    metadata:
+      labels:
+        app: appname
+
+    spec:
+      volumes:
+        - name: config
+          configMap:
+            name: appname-config
+
+      containers:
+        - name: nginx-container
+          image: nginx
+          volumeMounts:
+            - name: config
+              mountPath: /config
+---
+
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: appname-config
+
+data:
+  THIS_FILE: "THIS_CONTENT"

kube/400/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: appname
+
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: appname
+
+  template:
+    metadata:
+      labels:
+        app: appname
+
+    spec:
+      containers:
+        - name: nginx-container
+          image: nginx
+          # injecting directly
+          env:
+            - name: FOO
+              value: "BAR"
+
+            - name: BAR
+              valueFrom:
+                configMapKeyRef:
+                  name: appname-config
+                  key: BAR
+
+          # alternative
+          # envFrom:
+          #   - configMapRef:
+          #     name: appname-config
+          #   prefix: SOME_
+
+---
+
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: appname-config
+
+data:
+  BAR: "FOO"

kube/400/secrets.yaml

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+apiVersion: v1
+kind: Secret
+metadata:
+  name: appname-secrets
+
+stringData:
+  SHIU: "secret"
+
+# also valid
+# data:
+#   SHIU: "c2VjcmV0Cg=="
+
+---
+
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: appname
+
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: appname
+
+  template:
+    metadata:
+      labels:
+        app: appname
+
+    spec:
+      containers:
+        - name: nginx-container
+          image: nginx
+          # use secretKeyRef instead
+          env:
+            - name: SHIU
+              valueFrom:
+                secretKeyRef:
+                  name: appname-secrets
+                  key: SHIU

kube/500/cron.yaml

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+apiVersion: batch/v1
+kind: CronJob
+metadata:
+  name: appname-cron
+spec:
+  schedule: "* * * * * "
+  jobTemplate:
+    spec:
+      template:
+        spec:
+          restartPolicy: OnFailure
+          containers:
+            - name: echo
+              image: busybox
+              command: ["echo", "job is done in cronjob"]

kube/500/jobs.yaml

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+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: app-jobs
+spec:
+  # auto clean up
+  # ttlSecondsAfterFinished: 60
+  # multiple runs
+  # completions: 5
+  #
+  # parallelism: 2
+  # backoffLimit: 10
+  template:
+    spec:
+      restartPolicy: OnFailure
+      containers:
+        - name: echo
+          image: busybox
+          command: ["echo", "jobs is done"]

kube/600/namespace.yaml

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+apiVersion: v1
+kind: Namespace
+metadata:
+  name: my-name-is

kube/600/pod.yaml

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+apiVersion: v1
+kind: Pod
+metadata:
+  name: pod-in-space
+  namespace: my-name-is
+spec:
+  containers:
+    - name: nginx-container
+      image: nginx