Welcome to Stack Simplify

15-Kubernetes-Requests-Limits/kube-manifests-v1/01-NginxApp1-Deployment.yml

@@ -28,4 +28,3 @@ spec:
             limits:
               cpu: "200m"
               memory: "256Mi"                     
-

16-Kubernetes-Namespaces/16-01-Namespaces-Imperative/README.md

@@ -0,0 +1,84 @@
+# Kubernetes Namespaces - Imperative using kubectl
+
+## Step-01: Introduction
+- Namespaces allow to split-up resources into different groups.
+- Resource names should be unique in a namespace
+- We can use namespaces to create multiple environments like dev, staging and production etc
+- Kubernetes will always list the resources from `default namespace` unless we provide exclusively from which namespace we need information from.
+
+## Step-02: Namespaces Generic - Deploy in Dev1 and Dev2
+### Create Namespace
+```
+# List Namespaces
+kubectl get ns 
+
+# Craete Namespace
+kubectl create namespace <namespace-name>
+kubectl create namespace dev1
+kubectl create namespace dev2
+
+# List Namespaces
+kubectl get ns 
+```
+### Deploy All k8s Objects to default, dev1 and dev2 namespaces
+```
+# Deploy All k8s Objects
+kubectl apply -f kube-manifests/  
+kubectl apply -f kube-manifests/ -n dev1
+kubectl apply -f kube-manifests/ -n dev2
+
+# List all objects from default, dev1 & dev2 Namespaces
+kubectl get all -n default
+kubectl get all -n dev1
+kubectl get all -n dev2
+```
+
+## Step-04: Access Application
+
+### Default Namesapace
+```
+# List Services
+kubectl get svc
+
+# Access Application
+http://<Public-IP-from-List-Services-Output>/app1/index.html
+```
+
+### Dev1 Namespace
+```
+# List Services
+kubectl get svc -n dev1
+
+# Access Application
+http://<Public-IP-from-List-Services-Output>/app1/index.html
+```
+### Dev2 Namespace
+```
+# List Services
+kubectl get svc -n dev2
+
+# Access Application
+http://<Public-IP-from-List-Services-Output>/app1/index.html
+```
+## Step-05: Clean-Up
+```
+# Delete namespaces dev1 & dev2
+kubectl delete ns dev1
+kubectl delete ns dev2
+
+# List all objects from dev1 & dev2 Namespaces
+kubectl get all -n dev1
+kubectl get all -n dev2
+
+# List Namespaces
+kubectl get ns
+
+# Delete App from default Namespace (Dont Delete default Namespace - k8s default service exists in it)
+kubectl delete -f kube-manifests/
+
+# Get all from All Namespaces
+kubectl get all -all-namespaces
+```
+
+## References:
+- https://kubernetes.io/docs/tasks/administer-cluster/namespaces-walkthrough/

16-Kubernetes-Namespaces/16-01-Namespaces-Imperative/kube-manifests/01-NginxApp1-Deployment.yml

@@ -0,0 +1,31 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: app1-nginx-deployment
+  labels:
+    app: app1-nginx
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: app1-nginx
+  template:
+    metadata:
+      labels:
+        app: app1-nginx
+    spec:
+      containers:
+        - name: app1-nginx
+          image: stacksimplify/kube-nginxapp1:1.0.0
+          imagePullPolicy: Always
+          ports:
+            - containerPort: 80
+          # Requests & Limits 
+          resources:
+            requests:
+              cpu: "100m" 
+              memory: "128Mi"
+            limits:
+              cpu: "200m"
+              memory: "256Mi"                     
+

16-Kubernetes-Namespaces/16-01-Namespaces-Imperative/kube-manifests/02-NginxApp1-LoadBalancer-Service.yml

@@ -0,0 +1,13 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: app1-nginx-clusterip-service
+  labels:
+    app: app1-nginx
+spec:
+  type: LoadBalancer
+  selector:
+    app: app1-nginx
+  ports:
+    - port: 80
+      targetPort: 80

16-Kubernetes-Namespaces/16-02-Namespaces-LimitRange-default/README.md

@@ -0,0 +1,93 @@
+# Kubernetes Namespaces - LimitRange - Declarative using YAML
+## Step-01: Create Namespace manifest
+- **Important Note:** File name starts with `00-`  so that when creating k8s objects namespace will get created first so it don't throw an error.
+```yaml
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: dev3
+```
+
+## Step-02: Create LimitRange manifest
+- Instead of specifying `resources like cpu and memory` in every container spec of a pod defintion, we can provide the default CPU & Memory for all containers in a namespace using `LimitRange`
+```yaml
+apiVersion: v1
+kind: ResourceQuota
+metadata:
+  name: ns-resource-quota
+  namespace: dev3
+spec:
+  limits:
+    - default:
+        memory: "512Mi" # If not specified the Container's memory limit is set to 512Mi, which is the default memory limit for the namespace.
+        cpu: "500m"  # If not specified default limit is 1 vCPU per container 
+      defaultRequest:
+        memory: "256Mi" # If not specified default it will take from whatever specified in limits.default.memory
+        cpu: "300m" # If not specified default it will take from whatever specified in limits.default.cpu
+      type: Container                        
+```
+
+## Step-03: Update all k8s manifest with namespace
+- Update all files from with `namespace: dev3` in top metadata section in folder `kube-manifests/` 
+- **Example**
+```yaml
+# Deployment Manifest metadata section
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: app1-nginx-deployment
+  labels:
+    app: app1-nginx
+  namespace: dev3    # Added namespace
+spec:
+
+# Service Manifest metadata section
+apiVersion: v1
+kind: Service
+metadata:
+  name: app1-nginx-clusterip-service
+  labels:
+    app: app1-nginx
+  namespace: dev3   # Added namespace
+spec: 
+```
+
+## Step-04: Create k8s objects & Test
+```
+# Create All Objects
+kubectl apply -f kube-manifests/
+
+# List Pods
+kubectl get pods -n dev3 
+
+# View Pod Specification (CPU & Memory)
+kubectl get pod <pod-name> -o yaml -n dev3
+
+# Get & Describe Limits
+kubectl get limits -n dev3
+kubectl describe limits default-cpu-mem-limit-range -n dev3
+
+# List Services
+kubectl get svc -n dev3
+
+# Access Application
+http://<Public-IP-from-List-Services-Output>/app1/index.html
+
+```
+## Step-05: Clean-Up
+- Delete all k8s objects created as part of this section
+```
+# Delete All
+kubectl delete -f kube-manifests/
+```
+
+
+
+
+
+
+
+## References:
+- https://kubernetes.io/docs/tasks/administer-cluster/namespaces-walkthrough/
+- https://kubernetes.io/docs/tasks/administer-cluster/manage-resources/cpu-default-namespace/
+- https://kubernetes.io/docs/tasks/administer-cluster/manage-resources/memory-default-namespace/

16-Kubernetes-Namespaces/16-02-Namespaces-LimitRange-default/kube-manifests/00-namespace-LimitRange-default.yml

@@ -0,0 +1,19 @@
+apiVersion: v1
+kind: Namespace
+metadata: 
+  name: dev3
+---  
+apiVersion: v1
+kind: LimitRange
+metadata:
+  name: default-cpu-mem-limit-range
+  namespace: dev3
+spec:
+  limits:
+    - default:
+        cpu: "500m"  # If not specified default limit is 1 vCPU per container     
+        memory: "512Mi" # If not specified the Container's memory limit is set to 512Mi, which is the default memory limit for the namespace.
+      defaultRequest:
+        cpu: "300m" # If not specified default it will take from whatever specified in limits.default.cpu      
+        memory: "256Mi" # If not specified default it will take from whatever specified in limits.default.memory
+      type: Container 

16-Kubernetes-Namespaces/16-02-Namespaces-LimitRange-default/kube-manifests/01-NginxApp1-Deployment.yml

@@ -0,0 +1,23 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: app1-nginx-deployment
+  labels:
+    app: app1-nginx
+  namespace: dev3    
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: app1-nginx
+  template:
+    metadata:
+      labels:
+        app: app1-nginx
+    spec:
+      containers:
+        - name: app1-nginx
+          image: stacksimplify/kube-nginxapp1:1.0.0
+          imagePullPolicy: Always
+          ports:
+            - containerPort: 80

16-Kubernetes-Namespaces/16-02-Namespaces-LimitRange-default/kube-manifests/02-NginxApp1-LoadBalancer-Service.yml

@@ -0,0 +1,14 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: app1-nginx-clusterip-service
+  labels:
+    app: app1-nginx
+  namespace: dev3    
+spec:
+  type: LoadBalancer
+  selector:
+    app: app1-nginx
+  ports:
+    - port: 80
+      targetPort: 80

16-Kubernetes-Namespaces/16-03-Namespaces-ResourceQuota/README.md

@@ -0,0 +1,73 @@
+# Kubernetes Namespaces - ResourceQuota - Declarative using YAML
+
+## Step-01: Create Namespace manifest
+- **Important Note:** File name starts with `00-`  so that when creating k8s objects namespace will get created first so it don't throw an error.
+```yml
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: dev3
+```
+
+## Step-02: Create ResourceQuota manifest
+```yml
+apiVersion: v1
+kind: ResourceQuota
+metadata:
+  name: ns-resource-quota
+  namespace: dev3
+spec:
+  hard:
+    requests.cpu: "1"
+    requests.memory: 1Gi
+    limits.cpu: "2"
+    limits.memory: 2Gi  
+    pods: "5"    
+    configmaps: "5" 
+    persistentvolumeclaims: "5" 
+    secrets: "5" 
+    services: "5"                      
+```
+
+
+## Step-03: Create k8s objects & Test
+```
+# Create All Objects
+kubectl apply -f kube-manifests/
+
+# List Pods
+kubectl get pods -n dev3
+
+# View Pod Specification (CPU & Memory)
+kubectl get pod <pod-name> -o yaml -n dev3
+
+# Get & Describe Limits
+kubectl get limits -n dev3
+kubectl describe limits default-cpu-mem-limit-range -n dev3
+
+# Get Resource Quota 
+kubectl get quota -n dev3
+kubectl describe quota ns-resource-quota -n dev3
+
+# List Service
+kubectl get svc -n dev3
+
+# Access Application
+http://<Public-IP-from-List-Services-Output>/app1/index.html
+
+```
+## Step-04: Clean-Up
+- Delete all k8s objects created as part of this section
+```
+# Delete All
+kubectl delete -f kube-manifests/
+```
+
+## References:
+- https://kubernetes.io/docs/tasks/administer-cluster/namespaces-walkthrough/
+- https://kubernetes.io/docs/tasks/administer-cluster/manage-resources/quota-memory-cpu-namespace/
+
+
+## Additional References:
+- https://kubernetes.io/docs/tasks/administer-cluster/manage-resources/cpu-constraint-namespace/ 
+- https://kubernetes.io/docs/tasks/administer-cluster/manage-resources/memory-constraint-namespace/