6b12001ca2
- Add Kubernetes examples demonstrating deployment of various applications (PostgreSQL, Redis, generic). This improves the documentation and provides practical usage examples. - Add `tokio` dependency for async examples. This enables the use of asynchronous operations in the examples. - Add `once_cell` dependency for improved resource management in Kubernetes module. This allows efficient management of singletons and other resources.
113 lines
3.9 KiB
Rust
113 lines
3.9 KiB
Rust
//! PostgreSQL Cluster Deployment Example
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//!
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//! This example shows how to deploy a PostgreSQL cluster using the
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//! KubernetesManager convenience methods.
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use sal_kubernetes::KubernetesManager;
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use std::collections::HashMap;
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#[tokio::main]
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async fn main() -> Result<(), Box<dyn std::error::Error>> {
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// Create Kubernetes manager for the database namespace
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let km = KubernetesManager::new("database").await?;
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// Create the namespace if it doesn't exist
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println!("Creating namespace 'database' if it doesn't exist...");
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match km.namespace_create("database").await {
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Ok(_) => println!("✓ Namespace 'database' created"),
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Err(e) => {
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if e.to_string().contains("already exists") {
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println!("✓ Namespace 'database' already exists");
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} else {
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return Err(e.into());
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}
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}
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}
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// Clean up any existing resources first
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println!("Cleaning up any existing PostgreSQL resources...");
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match km.deployment_delete("postgres-cluster").await {
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Ok(_) => println!("✓ Deleted existing deployment"),
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Err(_) => println!("✓ No existing deployment to delete"),
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}
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match km.service_delete("postgres-cluster").await {
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Ok(_) => println!("✓ Deleted existing service"),
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Err(_) => println!("✓ No existing service to delete"),
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}
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// Configure PostgreSQL-specific labels
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let mut labels = HashMap::new();
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labels.insert("app".to_string(), "postgres-cluster".to_string());
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labels.insert("type".to_string(), "database".to_string());
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labels.insert("engine".to_string(), "postgresql".to_string());
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// Configure PostgreSQL environment variables
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let mut env_vars = HashMap::new();
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env_vars.insert("POSTGRES_DB".to_string(), "myapp".to_string());
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env_vars.insert("POSTGRES_USER".to_string(), "postgres".to_string());
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env_vars.insert(
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"POSTGRES_PASSWORD".to_string(),
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"secretpassword".to_string(),
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);
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env_vars.insert(
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"PGDATA".to_string(),
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"/var/lib/postgresql/data/pgdata".to_string(),
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);
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// Deploy the PostgreSQL cluster using the convenience method
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println!("Deploying PostgreSQL cluster...");
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km.deploy_application(
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"postgres-cluster", // name
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"postgres:15", // image
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2, // replicas (1 master + 1 replica)
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5432, // port
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Some(labels), // labels
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Some(env_vars), // environment variables
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)
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.await?;
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println!("✅ PostgreSQL cluster deployed successfully!");
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// Check deployment status
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let deployments = km.deployments_list().await?;
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let postgres_deployment = deployments
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.iter()
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.find(|d| d.metadata.name.as_ref() == Some(&"postgres-cluster".to_string()));
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if let Some(deployment) = postgres_deployment {
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let total_replicas = deployment
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.spec
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.as_ref()
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.and_then(|s| s.replicas)
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.unwrap_or(0);
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let ready_replicas = deployment
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.status
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.as_ref()
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.and_then(|s| s.ready_replicas)
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.unwrap_or(0);
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println!(
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"Deployment status: {}/{} replicas ready",
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ready_replicas, total_replicas
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);
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}
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println!("\n📋 Connection Information:");
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println!(" Host: postgres-cluster.database.svc.cluster.local");
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println!(" Port: 5432");
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println!(" Database: postgres (default)");
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println!(" Username: postgres (default)");
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println!(" Password: Set POSTGRES_PASSWORD environment variable");
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println!("\n🔧 To connect from another pod:");
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println!(" psql -h postgres-cluster.database.svc.cluster.local -U postgres");
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println!("\n💡 Next steps:");
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println!(" • Set environment variables for database credentials");
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println!(" • Add persistent volume claims for data storage");
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println!(" • Configure backup and monitoring");
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Ok(())
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}
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