Using Zalando PostgreSQL Operator
The Zalando PostgreSQL Operator is a Kubernetes operator designed to simplify the management of PostgreSQL clusters. Developed by Zalando, this operator automates critical database operations such as provisioning, backups, scaling, and failover, allowing teams to focus on application development rather than database maintenance.
Key Features
1. Cluster Automation: Handles PostgreSQL cluster creation and management.
2. High Availability: Provides automatic failover and load balancing.
3. Backup and Restore: Simplifies regular backups and recovery processes.
4. Scaling: Supports horizontal and vertical scaling.
5. Security: Integrates with Kubernetes secrets for secure credential management.
Installation
Prerequisites:
1. Add the Helm repository:
helm repo add zalando https://opensource.zalando.com/postgres-operator/charts/postgres-operator helm repo update
2. Install the PostgreSQL Operator:
helm install postgres-operator zalando/postgres-operator
Syntax for Cluster Definition
The operator uses a YAML manifest to define PostgreSQL clusters. Below is a sample configuration:
apiVersion: "acid.zalan.do/v1"
kind: postgresql
metadata:
name: my-postgres-cluster # Name of the cluster
namespace: default # Namespace in Kubernetes
spec:
teamId: "my-team" # Team owning the cluster
volume:
size: 10Gi # Disk size
numberOfInstances: 3 # Number of PostgreSQL instances
users:
admin: # User roles
- superuser
- createdb
databases:
mydb: admin # Database and its owner
postgresql:
version: "14" # PostgreSQL version
Example 1: Deploying a PostgreSQL Cluster
1. Apply the YAML manifest:
kubectl apply -f postgres-cluster.yaml
2. Verify the Cluster:
kubectl get pods -l application=spilo
Explanation:
Example 2: Enabling Backups
Configure backups using S3 storage in the operator configuration:
spec:
enableLogicalBackup: true
backup:
s3_bucket: "my-s3-bucket"
s3_region: "us-east-1"
s3_endpoint: "https://s3.amazonaws.com"
steps:
1. Update the YAML file with S3 credentials.
2. Apply the changes:
kubectl apply -f postgres-cluster.yaml
Explanation: This enables automated logical backups stored in an S3-compatible storage service.
Monitoring with Metrics
The operator integrates with Prometheus to monitor PostgreSQL metrics.
1. Install Prometheus in the Kubernetes cluster.
2. Use the metrics endpoint provided by the Zalando operator:
kubectl port-forward svc/postgres-operator 8080:8080
3. Access metrics at http://localhost:8080/metrics.
Best Practices:
1. Namespace Isolation: Deploy PostgreSQL clusters in isolated namespaces.
2. Regular Backups: Enable and verify backup mechanisms.
3. Resource Limits: Define resource requests and limits for predictable scaling.
4. Security: Use Kubernetes secrets for sensitive data like passwords.
Common Issues
All PostgreSQL Questions, Answers, and Code Snippets Collection.
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4