I have a Spring Boot and PostgreSQL communication issue using service name.
I have created a cluster using Calico for networking, as follows:
sudo kubeadm init --pod-network-cidr=192.168.0.0/16 --apiserver-advertise-address=178.12.1.10
and joined to the worker node using the output produced from the above command.
When I am deploying the pod and service both are running on different subnets. Am I missing something?
kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
backend-service ClusterIP 10.110.149.43 <none> 8091/TCP 12s
postgres ClusterIP 10.108.1.52 <none> 5432/TCP 14m
The service endpoint is not getting generated.
kubectl get endpoints
NAME ENDPOINTS AGE
backend-service 20m
postgres <none> 21m
kubectl get pods --all-namespaces
default backend-service-6dbd64ff4d-gqkq8 0/1 CrashLoopBackOff 12 57m
default postgres-7564bcc778-578fx 1/1 Running 0 57m
kube-system calico-etcd-b7wqf 1/1 Running 1 2d3h
kube-system calico-kube-controllers-74887d7bdf-wxhkd 1/1 Running 1 2d3h
kube-system calico-node-689b5 0/1 Running 0 47h
kube-system calico-node-smkq5 0/1 Running 1 47h
kube-system coredns-86c58d9df4-7ncdk 1/1 Running 1 2d3h
kube-system coredns-86c58d9df4-g4jcp 1/1 Running 1 2d3h
kube-system etcd-kmaster 1/1 Running 1 2d3h
kube-system kube-apiserver-kmaster 1/1 Running 1 2d3h
kube-system kube-controller-manager-kmaster 1/1 Running 3 2d3h
kube-system kube-proxy-njx5c 1/1 Running 1 2d3h
kube-system kube-proxy-pkxx5 1/1 Running 1 2d3h
kube-system kube-scheduler-kmaster 1/1 Running 3 2d3h
kube-system kubernetes-dashboard-57df4db6b-zcvcc 1/1 Running 1 2d3h
You need to check service-cluster-ip-range CIDR that is specified by flag to the API server. service clusterIP is assigned from service-cluster-ip-range.
you have initialized the cluster with --pod-network-cidr=192.168.0.0/16
note that pod-network-cidr range is used for assigning the ip address to pods. it is different from service clusterIP
you should be checking service-cluster-ip-range that is defined in api server startup parameters
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