feat: Providing some clusters for kubernetes

examples/kubernetes/clusters/postgres.rs

@@ -0,0 +1,73 @@
+//! PostgreSQL Cluster Deployment Example
+//!
+//! This example shows how to deploy a PostgreSQL cluster using the
+//! KubernetesManager convenience methods.
+
+use sal_kubernetes::KubernetesManager;
+use std::collections::HashMap;
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    // Create Kubernetes manager for the database namespace
+    let km = KubernetesManager::new("database").await?;
+
+    // Configure PostgreSQL-specific labels
+    let mut labels = HashMap::new();
+    labels.insert("app".to_string(), "postgres-cluster".to_string());
+    labels.insert("type".to_string(), "database".to_string());
+    labels.insert("engine".to_string(), "postgresql".to_string());
+
+    // Deploy the PostgreSQL cluster using the convenience method
+    println!("Deploying PostgreSQL cluster...");
+    km.deploy_application(
+        "postgres-cluster", // name
+        "postgres:15",      // image
+        2,                  // replicas (1 master + 1 replica)
+        5432,               // port
+        Some(labels),       // labels
+    )
+    .await?;
+
+    println!("✅ PostgreSQL cluster deployed successfully!");
+
+    // Check deployment status
+    let deployments = km.deployments_list().await?;
+    let postgres_deployment = deployments
+        .iter()
+        .find(|d| d.metadata.name.as_ref() == Some(&"postgres-cluster".to_string()));
+
+    if let Some(deployment) = postgres_deployment {
+        let total_replicas = deployment
+            .spec
+            .as_ref()
+            .and_then(|s| s.replicas)
+            .unwrap_or(0);
+        let ready_replicas = deployment
+            .status
+            .as_ref()
+            .and_then(|s| s.ready_replicas)
+            .unwrap_or(0);
+
+        println!(
+            "Deployment status: {}/{} replicas ready",
+            ready_replicas, total_replicas
+        );
+    }
+
+    println!("\n📋 Connection Information:");
+    println!("  Host: postgres-cluster.database.svc.cluster.local");
+    println!("  Port: 5432");
+    println!("  Database: postgres (default)");
+    println!("  Username: postgres (default)");
+    println!("  Password: Set POSTGRES_PASSWORD environment variable");
+
+    println!("\n🔧 To connect from another pod:");
+    println!("  psql -h postgres-cluster.database.svc.cluster.local -U postgres");
+
+    println!("\n💡 Next steps:");
+    println!("  • Set environment variables for database credentials");
+    println!("  • Add persistent volume claims for data storage");
+    println!("  • Configure backup and monitoring");
+
+    Ok(())
+}