refactor: Update Kubernetes introduction and add Secret Management se…

…ction

docs/kubernetes/introduction.md

@@ -916,6 +916,13 @@ kubectl config use-context <context-name>
 To make cluster switching easier we can use a tool called `kubectx` and `kubens`.
 
 
+## Secret Management
+
+
+
+## Troubleshoting
+
+A great [blog](https://learnk8s.io/troubleshooting-deployments) on troubleshooting deployments.
 
 
 

docs/kubernetes/tools/kustomize/_category_.json

@@ -0,0 +1,4 @@
+{
+  "label": "Kustomize",
+  "position": 5
+}

docs/kubernetes/tools/kustomize/app/base/ConfigMap.yaml

@@ -0,0 +1,8 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: nginx-configmap
+  namespace: nginx-demo
+data:
+  index.html: |
+    <h1> Hello World from ConfigMap </h1>

docs/kubernetes/tools/kustomize/app/base/Deployment.yaml

@@ -0,0 +1,41 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx-deployment
+  namespace: nginx-demo
+spec:
+  selector:
+    matchLabels:
+      app: nginx-app
+  template:
+    metadata:
+      labels:
+        app: nginx-app
+    spec:
+      containers:
+      - name: nginx
+        image: nginx:latest
+        ports:
+        - containerPort: 80
+        resources:
+          limits:
+            cpu: 100m 
+            memory: 100Mi
+          requests:
+            cpu:  100m
+            memory: 100Mi
+        readinessProbe:
+          failureThreshold: 3
+          httpGet:
+            path: /
+            port: 80
+        volumeMounts:
+        - name: html-file
+          mountPath: /usr/share/nginx/html
+
+      volumes:
+        - name: html-file
+          configMap:
+            name: nginx-configmap
+
+

docs/kubernetes/tools/kustomize/app/base/Kustomization.yaml

@@ -0,0 +1,7 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+namespace: nginx-demo
+resources:
+- Deployment.yaml
+- Service.yaml
+- ConfigMap.yaml 

docs/kubernetes/tools/kustomize/app/base/Service.yaml

@@ -0,0 +1,11 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: nginx-service-clusterip
+  namespace: nginx-demo
+spec:
+  selector:
+    app: nginx-app
+  ports:
+  - port: 80
+    targetPort: 80

docs/kubernetes/tools/kustomize/app/development/Kustomization.yaml

@@ -0,0 +1,8 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+namespace: nginx-demo
+resources:
+  - ../base
+patches:
+  - path: ./patches/Deployment.yaml
+  - path: ./patches/ConfigMap.yaml

docs/kubernetes/tools/kustomize/app/development/patches/ConfigMap.yaml

@@ -0,0 +1,8 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: nginx-configmap
+  namespace: nginx-demo
+data:
+  index.html: |
+    <h1> Hello World from Development </h1>

docs/kubernetes/tools/kustomize/app/development/patches/Deployment.yaml

@@ -0,0 +1,12 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx-deployment
+  namespace: nginx-demo
+spec:
+  replicas: 2
+  template:
+    spec:
+      containers:
+      - name: nginx
+        image: nginx:1.26.0

docs/kubernetes/tools/kustomize/app/production/Kustomization.yaml

@@ -0,0 +1,8 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+namespace: nginx-demo
+resources:
+  - ../base
+patches:
+  - path: ./patches/Deployment.yaml
+  - path: ./patches/ConfigMap.yaml

docs/kubernetes/tools/kustomize/app/production/patches/ConfigMap.yaml

@@ -0,0 +1,8 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: nginx-configmap
+  namespace: nginx-demo
+data:
+  index.html: |
+    <h1> Hello World from Production </h1>

docs/kubernetes/tools/kustomize/app/production/patches/Deployment.yaml

@@ -0,0 +1,12 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx-deployment
+  namespace: nginx-demo
+spec:
+  replicas: 3
+  template:
+    spec:
+      containers:
+      - name: nginx
+        image: nginx:1.27.0

docs/kubernetes/tools/kustomize/introduction.md

@@ -0,0 +1,14 @@
+---
+title: Kustomize
+sidebar_position: 1
+---
+
+## Kustomize
+
+Kustomize is a tool that lets you customize raw, template-free YAML files for multiple purposes, leaving the original YAML untouched and usable as is.
+
+
+
+Kustomize uses the `apiVersion`, `kind`, `name` and `namespace` to identify resources. It appends a suffix to the name and namespace fields to differentiate between different versions of the same resource.
+
+