Changes between Initial Version and Version 1 of minikubedeployment2023

Timestamp:

Nov 13, 2023, 6:55:24 AM (17 months ago)

Author:

deepthi

Comment:

--

minikubedeployment2023

@@ +1 @@
+You may continue to install Kubernetes on the vm you already installed docker. If you are installing this on a different machine make sure docker is already installed.
+Part 1
+Installing kubeadm, kubelet, and kubectl:
+1. Update the apt package index:
+sudo apt-get update
+2. Install packages needed to use the Kubernetes apt repository:
+sudo apt-get install -y apt-transport-https ca-certificates curl vim git
+3. Download the public signing key for the Kubernetes package repositories:
+curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.28/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg
+4. Add the Kubernetes apt repository:
+echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.28/deb/ /' | sudo tee /etc/apt/sources.list.d/kubernetes.list
+Update the apt package index again:
+sudo apt-get update
+5. Install kubelet, kubeadm, and kubectl:
+sudo apt-get install -y kubelet kubeadm kubectl
+6. Pin installed versions of kubelet, kubeadm, and kubectl to prevent them from being accidentally updated:
+sudo apt-mark hold kubelet kubeadm kubectl
+7. Check installed versions:
+kubectl version --client
+
+kubeadm version
+ 
+Disable Swap Space
+8. Disable all swaps from /proc/swaps.
+sudo swapoff -a
+
+sudo sed -i.bak -r 's/(.+ swap .+)/#\1/' /etc/fstab
+9. Check if swap has been disabled by running the free command.
+free -h
+ 
+Install Container runtime
+10. Configure persistent loading of modules 
+sudo tee /etc/modules-load.d/k8s.conf <<EOF
+overlay
+br_netfilter
+EOF 
+11. Load at runtime 
+sudo modprobe overlay 
+
+sudo modprobe br_netfilter 
+12. Ensure sysctl params are set
+sudo tee /etc/sysctl.d/kubernetes.conf<<EOF
+
+net.bridge.bridge-nf-call-ip6tables = 1
+
+net.bridge.bridge-nf-call-iptables = 1
+
+net.ipv4.ip_forward = 1
+
+EOF
+13. Reload configs
+sudo sysctl --system 
+14. Install required packages
+sudo apt install -y containerd.io 
+15. Configure containerd and start service
+sudo mkdir -p /etc/containerd
+
+sudo containerd config default | sudo tee /etc/containerd/config.toml
+16. Configuring a cgroup driver
+Both the container runtime and the kubelet have a property called "cgroup driver", which is essential for the management of cgroups on Linux machines.
+sudo sed -i 's/SystemdCgroup \= false/SystemdCgroup \= true/g' /etc/containerd/config.toml
+17. Restart containerd
+sudo systemctl restart containerd
+
+sudo systemctl enable containerd
+
+systemctl status containerd
+
+Initialize control plane
+18. Make sure that the br_netfilter module is loaded:
+lsmod | grep br_netfilter
+Output should similar to:
+br_netfilter           22256  0 
+bridge                151336  1 br_netfilter
+19. Enable kubelet service.
+sudo systemctl enable kubelet
+20. Pull container images (it will take some time):
+sudo kubeadm config images pull --cri-socket /run/containerd/containerd.sock
+21. Bootstrap the endpoint. Here we use 10.244.0.0/16 as the pod network:
+sudo kubeadm init   --pod-network-cidr=10.244.0.0/16   --cri-socket /run/containerd/containerd.sock
+You will see Your Kubernetes control-plane has initialized successfully!
+22. To start the cluster, you need to run the following as a regular user (For this scenario we will only use a single host):
+  mkdir -p $HOME/.kube
+  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
+  sudo chown $(id -u):$(id -g) $HOME/.kube/config
+23. Check cluster info:
+kubectl cluster-info
+24. Install a simple network plugin.
+wget https://raw.githubusercontent.com/flannel-io/flannel/master/Documentation/kube-flannel.yml
+kubectl apply -f kube-flannel.yml
+25. Check the plugin is working
+kubectl get pods -n kube-flannel
+26. Confirm master node is ready: (If you see the status as Notready, give it a around 10mins)
+kubectl get nodes -o wide
+27. On a master/ control node to query the nodes you can use:
+kubectl get nodes
+Scheduling Pods on Kubernetes Master Node
+28. By default, Kubernetes Cluster will not schedule pods on the master/control-plane node for security reasons. It is recommended you keep it this way, but for test environments you need to schedule Pods on control-plane node to maximize resource usage.
+kubectl taint nodes --all  node-role.kubernetes.io/control-plane-
+Part 2 
+Create a file simple-pod.yaml
+apiVersion: v1
+kind: Pod
+metadata:
+  name: nginx
+spec:
+  containers:
+  - name: nginx
+    image: nginx:1.14.2
+    ports:
+    - containerPort: 80
+To create the Pod shown above, run the following command:
+kubectl apply -f simple-pod.yaml
+Pods are generally not created directly and are created using workload resources. See Working with Pods 
+Links to an external site. for more information on how Pods are used with workload resources
+Part 3
+Deploying a Simple Web Application on Kubernetes
+1. Create a Deployment Manifest:
+A Deployment ensures that a specified number of pod replicas are running at any given time. Let's create a simple Deployment for a web application using the nginx image.
+Save the following YAML to a file named webapp-deployment.yaml:
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: webapp-deployment
+  labels:
+    app: webapp
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: webapp
+  template:
+    metadata:
+      labels:
+        app: webapp
+    spec:
+      containers:
+      - name: nginx
+        image: nginx:latest
+        ports:
+        - containerPort: 80
+2. Create a Service Manifest:
+A Service is an abstraction that defines a logical set of Pods and enables external traffic exposure, load balancing, and service discovery. For our web application, we'll use a NodePort service.
+Save the following YAML to a file named webapp-service.yaml:
+apiVersion: v1
+kind: Service
+metadata:
+  name: webapp-service
+spec:
+  selector:
+    app: webapp
+  ports:
+    - protocol: TCP
+      port: 80
+      targetPort: 80
+      nodePort: 30080
+  type: NodePort
+3. Deploy the Application:
+Apply the Deployment and Service manifests:
+kubectl apply -f webapp-deployment.yaml
+kubectl apply -f webapp-service.yaml
+4. Verify the Deployment:
+Check the status of the Deployment and Service:
+kubectl get deployments
+kubectl get services
+You should see your webapp-deployment with 2 replicas. Give it a time to take both replicas online.
+5. Access the Web Application:
+Since we used a NodePort service, the web application should be accessible on node's IP at port 30080.
+If you're unsure of your node IPs, you can get them with:
+kubectl get nodes -o wide
+Then, in a web browser (though ssh tunnel if you are in UiS cloud) or using a tool like curl, access the web application:
+curl http://<NODE_IP>:30080
+You should see the default nginx welcome page, indicating that your web application is running.
+ 
+Part 4
+Deploying WordPress and MySQL on Kubernetes
+
+Installing dependancies:
+Download rancher.io/local-path storage class:
+kubectl apply -f https://raw.githubusercontent.com/rancher/local-path-provisioner/master/deploy/local-path-storage.yaml
+Check with kubectl get storageclass
+Make this storage class (local-path) the default:
+kubectl patch storageclass local-path -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'
+
+1. Create a PersistentVolumeClaim for MySQL:
+
+MySQL needs persistent storage to store its data. Save the following YAML to a file named mysql-pvc.yaml:
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: mysql-pvc
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 1Gi
+Apply the PVC:
+kubectl apply -f mysql-pvc.yaml
+2. Deploy MySQL:
+Save the following YAML to a file named mysql-deployment.yaml:
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: mysql
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: mysql
+  template:
+    metadata:
+      labels:
+        app: mysql
+    spec:
+      containers:
+      - name: mysql
+        image: mysql:5.7
+        env:
+        - name: MYSQL_ROOT_PASSWORD
+          value: "password"
+        - name: MYSQL_DATABASE
+          value: "wordpress"
+        ports:
+        - containerPort: 3306
+        volumeMounts:
+        - name: mysql-persistent-storage
+          mountPath: /var/lib/mysql
+      volumes:
+      - name: mysql-persistent-storage
+        persistentVolumeClaim:
+          claimName: mysql-pvc
+Apply the Deployment:
+kubectl apply -f mysql-deployment.yaml
+
+3. Create a Service for MySQL:
+
+This will allow WordPress to communicate with MySQL. Save the following YAML to a file named mysql-service.yaml:
+apiVersion: v1
+kind: Service
+metadata:
+  name: mysql
+spec:
+  selector:
+    app: mysql
+  ports:
+    - protocol: TCP
+      port: 3306
+      targetPort: 3306
+
+Apply the Service:
+kubectl apply -f mysql-service.yaml
+
+4. Deploy WordPress:
+Save the following YAML to a file named wordpress-deployment.yaml:
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: wordpress
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: wordpress
+  template:
+    metadata:
+      labels:
+        app: wordpress
+    spec:
+      containers:
+      - name: wordpress
+        image: wordpress:latest
+        env:
+        - name: WORDPRESS_DB_HOST
+          value: mysql
+        - name: WORDPRESS_DB_USER
+          value: "root"
+        - name: WORDPRESS_DB_PASSWORD
+          value: "password"
+        ports:
+        - containerPort: 80
+
+Apply the Deployment:
+kubectl apply -f wordpress-deployment.yaml
+
+5. Create a Service for WordPress:
+
+This will expose WordPress to external traffic. Save the following YAML to a file named wordpress-service.yaml:
+apiVersion: v1
+kind: Service
+metadata:
+  name: wordpress
+spec:
+  selector:
+    app: wordpress
+  ports:
+    - protocol: TCP
+      port: 80
+      targetPort: 80
+  type: NodePort
+
+Apply the Service:
+kubectl apply -f wordpress-service.yaml
+
+6. Access WordPress:
+
+Since we used a NodePort service, WordPress should be accessible on node's IP at a dynamically allocated port above 30000.
+To find the NodePort assigned to WordPress:
+
+kubectl get svc wordpress
+
+Then, in a web browser with the ssh tunnel, access WordPress:
+
+http://< INTERNAL-IP>:<NODE_PORT>
+ 
+Part 5
+Convert your Docker deployment into a Kubernetes deployment, you may compose your own service, deployment manifests as needed. Use the docker images you used previously when creating the pods/deployments. 
+ 
+Additional ref: https://kubebyexample.com/