I have two Ubuntu VMs created using Oracle Virtual Box on my Windows 11 laptop. I setup a k8s cluster using kubeadm with these two Ubuntu VMs, one of them is a master node and an another one is a worker node. Both the nodes are running with Ubuntu 20.04.3 LTS and docker://20.10.7. I deployed my spring boot app into the k8s cluster and exposed a node port service for my spring boot app with port 30000, but I am not really sure on how to access my node port service on the internet outside my cluster. Could you please help me with this issue?
Following are the IP address of my nodes in k8s cluster - master [192.168.254.94] and worker [192.168.254.95]. I tried with the following urls but none of them worked
http://192.168.254.94:30000/swagger-ui.html http://192.168.254.95:30000/swagger-ui.html
These above urls throwing message which says refused to connect
http://192.168.9.13:30000/swagger-ui.html http://192.168.9.14:30000/swagger-ui.html
These above urls says that the site cannot be reached
Below is the content of my application.yaml which I used for deploying the spring boot app and its corresponding service
apiVersion: apps/v1
kind: Deployment
metadata:
name: dealer-engine
spec:
replicas: 1
selector:
matchLabels:
app: dealer-engine
template:
metadata:
labels:
app: dealer-engine
spec:
containers:
- name: dealer-engine
image: moviepopcorn/dealer_engine:0.0.1
ports:
- containerPort: 9090
env:
- name: MONGO_URL
value: mongodb://mongo-service:27017/mazda
imagePullPolicy: Always
---
apiVersion: v1
kind: Service
metadata:
name: dealer-engine
spec:
type: NodePort
selector:
app: dealer-engine
ports:
- port: 9091
targetPort: 9090
nodePort: 30000
externalIPs:
- 10.0.0.12
I am a beginner in k8s so please help me on how I can access my node port service outside my k8s cluster.
CodePudding user response:
Have you install any CNI plugin like flannel?
If yes, Check your CIDR setting here
kubectl get node k8s-master -o yaml | grep podCIDR:
kubectl get configmap -n kube-system kube-flannel-cfg -o yaml | grep '"Network":'
Basically yes, CNI is must. flannel is the most simple one.
You must deploy a Container Network Interface (CNI) based Pod network add-on so that your Pods can communicate with each other. Cluster DNS (CoreDNS) will not start up before a network is installed.
- Download cni pulgin on every server.
# download cni plugin
wget https://github.com/containernetworking/plugins/releases/download/v0.9.1/cni-plugins-linux-amd64-v0.9.1.tgz
sudo mkdir -p /opt/cni/bin
sudo tar -xzvf cni-plugins-linux-amd64-v0.9.1.tgz -C /opt/cni/bin
- Reset you cluster
kubeadm reset
- Init your cluster with cidr setting must same as flannel config, default
10.244.0.0
kubeadm init --pod-network-cidr=10.244.0.0/16
- Apply cni plugin.
kubectl apply -f https://raw.githubusercontent.com/flannel-io/flannel/master/Documentation/kube-flannel.yml
CodePudding user response:
I created a new simple Springboot application which returns "Hello world!!!" back to the user when the following endpoint "/helloWorld" is invoked. I deployed this spring boot app into my k8s cluster using the below yaml configuration
apiVersion: apps/v1
kind: Deployment
metadata:
name: hello-world
spec:
replicas: 1
selector:
matchLabels:
app: hello-world
template:
metadata:
labels:
app: hello-world
spec:
containers:
- name: hello-world
image: moviepopcorn/hello_world:0.0.1
ports:
- containerPort: 9091
imagePullPolicy: Always
---
apiVersion: v1
kind: Service
metadata:
name: hello-world
spec:
type: NodePort
selector:
app: hello-world
ports:
- port: 9091
targetPort: 9091
nodePort: 30001
After successful deployment, I am able to access the helloWorld endpoint using the following url <K8S_MASTER_NODE_IP>:<NODE_PORT (30001)>.
Thank you all for your answers and inputs. Very much appreciated.