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Version: release-0.9

Connect database in production environment

In the production environment, it is normal to connect a database with CLI and SDK clients. There are three scenarios.

  • Scenario 1: Client1 and the database are in the same Kubernetes cluster. To connect client1 and the database, see Use ClusterIP.
  • Scenario 2: Client2 is outside the Kubernetes cluster, but it is in the same VPC as the database. To connect client2 and the database, see Expose VPC Private Address.
  • Scenario 3: Client3 and the database are in different VPCs, such as other VPCs or the public network. To connect client3 and the database, see Expose VPC Public Address.

See the figure below to get a clear image of the network location.

Example

Scenario 1. Connect database in the same Kubernetes cluster​

You can connect with the database ClusterIP or domain name.

To check the database endpoint, use kubectl get service <cluster-name>-<component-name>.

kubectl get service mycluster-mysql

Scenario 2. Client outside the Kubernetes cluster but in the same VPC as the Kubernetes cluster​

A stable domain name for long-term connections is required. An Internal LoadBalancer provided by the cloud vendor can be used for this purpose.

note

The following command creates a LoadBalancer instance for the database instance, which may incur expenses from your cloud vendor.

This example uses a MySQL cluster to demonstrate how to expose a VPC address on Alibaba Cloud.

kubectl apply -f - <<EOF
apiVersion: apps.kubeblocks.io/v1alpha1
kind: OpsRequest
metadata:
  name: ops-expose-enable
  namespace: demo
spec:
  clusterName: mycluster
  expose:
  - componentName: mysql
    services:
    - name: vpc
      roleSelector: leader
      serviceType: LoadBalancer
    switch: Enable
  preConditionDeadlineSeconds: 0
  type: Expose

To disable the LoadBalancer instance, execute the following command.

note

Once disabled, the instance is not accessible.

kubectl apply -f - <<EOF
apiVersion: apps.kubeblocks.io/v1alpha1
kind: OpsRequest
metadata:
  name: ops-expose-disable
  namespace: demo
spec:
  clusterName: mycluster
  expose:
  - componentName: mysql
    services:
    - name: vpc
      roleSelector: leader
      serviceType: LoadBalancer
    switch: Disable
  preConditionDeadlineSeconds: 0
  type: Expose

Scenario 3. Connect database with clients in other VPCs or public networks​

If the client is in a different VPC and requires public access, you can enable the cloud vendor's External LoadBalancer.

note

The following command creates a LoadBalancer instance for the database instance, which may incur expenses from your cloud vendor.

The example uses MySQL to demonstrate how to expose the public address on Alibaba Cloud.

kubectl apply -f - <<EOF
apiVersion: apps.kubeblocks.io/v1alpha1
kind: OpsRequest
metadata:
  name: ops-expose-enable
  namespace: demo
spec:
  clusterName: mycluster
  expose:
  - componentName: mysql
    services:
    - name: internet
      roleSelector: leader
      serviceType: LoadBalancer
    switch: Enable
  preConditionDeadlineSeconds: 0
  type: Expose

To disable the LoadBalancer instance, execute the following command.

kubectl apply -f - <<EOF
apiVersion: apps.kubeblocks.io/v1alpha1
kind: OpsRequest
metadata:
  name: ops-expose-disable
  namespace: demo
spec:
  clusterName: mycluster
  expose:
  - componentName: mysql
    services:
    - name: internet
      roleSelector: leader
      serviceType: LoadBalancer
    switch: Disable
  preConditionDeadlineSeconds: 0
  type: Expose
note

The instance is inaccessible after you disable the LoadBalancer instance.