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Good afternoon, I have a question, I am new to Kubernetes and I need to connect to a DB that is outside of my cluster, I could only connect to the DB using the hostNetwork = true, however, this is not recommended, in this case there is a method to communicate with External DB?

I leave you the yaml that I am currently using, my pod contains one container that work with spring boot

apiVersion: apps/v1 kind: Deployment metadata: name: find-complementary-account-info labels: app: find-complementary-account-info spec: replicas: 2 selector: matchLabels: app: find-complementary-account-info template: metadata: labels: app: find-complementary-account-info spec: hostNetwork: true dnsPolicy: Default containers: - name: find-complementary-account-info image:find-complementary-account-info:latest imagePullPolicy: IfNotPresent resources: limits: memory: "350Mi" requests: memory: "300Mi" ports: - containerPort: 8081 env: - name: URL_CONNECTION_BD value: jdbc:oracle:thin:@11.160.9.18:1558/DEFAULTSRV.WORLD - name: USERNAME_CONNECTION_BD valueFrom: secretKeyRef: name: credentials-bd-pers key: user_pers - name: PASSWORD_CONNECTION_BD valueFrom: secretKeyRef: name: credentials-bd-pers key: password_pers key: password_pers --- apiVersion: v1 kind: Service metadata: name: find-complementary-account-info spec: type: NodePort selector: app: find-complementary-account-info ports: - protocol: TCP port: 8081 targetPort: 8081 nodePort: 30020 

Anyone have an idea how to communicate with external DB? This is not a cloud cluster, it is OnPremise

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hostNetwork parameter is used for accessing pods from outside of the Cluster, you don't need that.

Pods from inside the Cluster can communicate externally because they are NATted. If not, something external prevent it, like a firewall or a missing routing.

The quicker way to find that is to ssh to one of your Kubernetes cluster nodes and try

telnet 11.160.9.18 1558 

Anyway that IP address seems a Public one, so you have to check your company firewall imho

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