deployment

kubernetes/workloads/deployment.md

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+#### 1. Deployment with Resource Limits and Horizontal Pod Autoscaler
+
+```yaml
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myapp
+  namespace: my-ns
+  labels:
+    app.kubernetes.io/name: myapp
+    app.kubernetes.io/env: development
+spec:
+  replicas: 5
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: myapp
+      app.kubernetes.io/env: development
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: myapp
+        app.kubernetes.io/env: development
+    spec:
+      containers:
+      - name: nginx
+        image: nginx # change image and apply again
+        resources:
+          limits:
+            memory: "128Mi"
+            cpu: "500m"
+          requests:
+            memory: "64Mi"
+            cpu: "250m"
+        ports:
+        - containerPort: 80
+```
+- `apiVersion: apps/v1`: Specifies the API version.
+- `kind: Deployment`: Defines the object as a Deployment.
+- `metadata`: Provides metadata for the Deployment.
+  - `name`: The name of the Deployment (`myapp`).
+  - `namespace`: The namespace where the Deployment will be created (`my-ns`).
+  - `labels`: Key-value pairs to categorize the Deployment.
+- `spec`: Describes the desired state.
+  - `replicas`: Number of pod replicas (5).
+  - `selector`: Identifies the pods managed by this Deployment.
+  - `template`: The pod template used by the Deployment.
+    - `metadata`: Metadata for the pod template.
+    - `spec`: Describes the pod specification.
+      - `containers`: Defines the containers within the pod.
+        - `name`: The name of the container (`nginx`).
+        - `image`: The container image (`nginx`).
+        - `resources`: Resource limits and requests.
+          - `limits`: Maximum resources (`128Mi` memory, `500m` CPU).
+          - `requests`: Minimum resources (`64Mi` memory, `250m` CPU).
+        - `ports`: Container ports (80).
+
+
+### 2. Deployment with Rolling Update Strategy
+
+```yaml
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: my-name
+  labels:
+    name: my-name
+spec:
+  strategy:
+    rollingUpdate:
+      maxSurge: 1
+      maxUnavailable: 1
+    type: RollingUpdate
+  template:
+    metadata:
+      labels:
+        name: my-name
+    spec:
+      containers:
+      - image: ipedrazas/docmock
+        name: my-name
+        resources:
+          requests:
+            cpu: "20m"
+            memory: "55M"
+        livenessProbe:
+          httpGet:
+            path: /_status/healthz
+            port: 5000
+          initialDelaySeconds: 90
+          timeoutSeconds: 10
+        readinessProbe:
+          httpGet:
+            path: /_status/healthz
+            port: 5000
+          initialDelaySeconds: 30
+          timeoutSeconds: 10
+        env:
+        - name: ENVVARNAME
+          value: ENVVARVALUE       
+        ports:
+        - containerPort: 5000
+          name: my-name
+        volumeMounts:
+        - mountPath: /data
+          name: data
+      volumes:
+        - name: data
+          emptyDir: {}
+      restartPolicy: Always
+      imagePullPolicy: Always
+```
+- `apiVersion: extensions/v1beta1`: Specifies the API version.
+- `kind: Deployment`: Defines the object as a Deployment.
+- `metadata`: Provides metadata for the Deployment.
+  - `name`: The name of the Deployment (`my-name`).
+  - `labels`: Key-value pairs to categorize the Deployment.
+- `spec`: Describes the desired state.
+  - `strategy`: Rolling update strategy.
+    - `rollingUpdate`: Defines the update strategy.
+      - `maxSurge`: Maximum number of additional pods (1).
+      - `maxUnavailable`: Maximum number of unavailable pods (1).
+    - `type`: The type of update strategy (`RollingUpdate`).
+  - `template`: The pod template used by the Deployment.
+    - `metadata`: Metadata for the pod template.
+    - `spec`: Describes the pod specification.
+      - `containers`: Defines the containers within the pod.
+        - `name`: The name of the container (`my-name`).
+        - `image`: The container image (`ipedrazas/docmock`).
+        - `resources`: Resource requests.
+          - `requests`: Minimum resources (`20m` CPU, `55M` memory).
+        - `livenessProbe`: Health check for the container.
+          - `httpGet`: HTTP GET request for the probe.
+            - `path`: The path to check (`/_status/healthz`).
+            - `port`: The port to check (5000).
+          - `initialDelaySeconds`: Initial delay before the probe starts (90 seconds).
+          - `timeoutSeconds`: Timeout for the probe (10 seconds).
+        - `readinessProbe`: Readiness check for the container.
+          - `httpGet`: HTTP GET request for the probe.
+            - `path`: The path to check (`/_status/healthz`).
+            - `port`: The port to check (5000).
+          - `initialDelaySeconds`: Initial delay before the probe starts (30 seconds).
+          - `timeoutSeconds`: Timeout for the probe (10 seconds).
+        - `env`: Environment variables for the container.
+          - `name`: The name of the environment variable (`ENVVARNAME`).
+          - `value`: The value of the environment variable (`ENVVARVALUE`).
+        - `ports`: Container ports.
+          - `containerPort`: The container port (5000).
+          - `name`: The name of the port (`my-name`).
+        - `volumeMounts`: Mounting volumes to the container.
+          - `mountPath`: The path to mount the volume (`/data`).
+          - `name`: The name of the volume (`data`).
+      - `volumes`: Defines the volumes.
+        - `name`: The name of the volume (`data`).
+        - `emptyDir`: An empty directory volume.
+      - `restartPolicy`: Restart policy for the container (`Always`).
+      - `imagePullPolicy`: Image pull policy (`Always`).
+