Apache ZooKeeper Coordination Service

This is a repackaged open source software product wherein additional charges apply for cloudimg support services.

## Apache ZooKeeper - Ready-to-Run Coordination Service

Skip the manual installation, configuration, and hardening steps. This AMI delivers Apache ZooKeeper 3.9 as a fully configured standalone coordination service that is operational within minutes of launch - not hours of setup. Point your distributed application at port 2181 and start coordinating immediately.

## Why This AMI Over Self-Deployment

Manually installing ZooKeeper means configuring data directories, systemd units, four-letter-word whitelists, monitoring endpoints, and securing the service - all before writing a single line of application code. This image eliminates that operational burden:

• ZooKeeper 3.9 on OpenJDK 17, pre-configured and running as a systemd service
• ZooNavigator znode-browser web UI bundled for visual management of an otherwise headless service
• nginx reverse-proxy on port 80 with HTTP basic authentication - no exposed management surface without credentials
• Per-instance password generated on first boot by a one-shot systemd service, stored in a root-only file
• Client port 2181 ready for application connections; admin server and four-letter-word commands enabled for monitoring
• No shared or default credentials ship in the image

## Secure First Boot

Every instance generates its own unique Web UI password on first launch. A systemd one-shot service creates the credential and writes it to a file readable only by root. The same credential protects both the ZooNavigator login and the nginx authentication wall. This eliminates the risk of well-known default passwords that plague many pre-built images.

## Application Stack

• Runtime: OpenJDK 17
• Coordination: Apache ZooKeeper 3.9 (standalone single-node ensemble)
• Web UI: ZooNavigator znode browser
• Reverse Proxy: nginx with HTTP basic auth on port 80
• Monitoring: Admin server and four-letter-word commands enabled

## Deployment Guidance

This AMI runs as a standalone single-node ensemble suitable for development, testing, proof-of-concept, and small production workloads. For multi-node ensemble expansion or production high-availability configurations, cloudimg support engineers can guide your architecture.

Recommended security group rules:

• Port 2181 (TCP) - ZooKeeper client connections from your application subnet
• Port 80 (TCP) - ZooNavigator web UI access from your management network
• Port 22 (TCP) - SSH for administration

## Use Cases

Kafka Development Cluster: A team running a 3-broker Apache Kafka cluster in a staging environment needs a lightweight, pre-hardened ZooKeeper node without managing a full ensemble. Launch this AMI, point Kafka broker configs at port 2181, and have coordination running before your CI pipeline completes.

Distributed Configuration Management: Centralize configuration for microservices using ZooKeeper's hierarchical key-value store.

Service Discovery and Naming: Register and discover services dynamically across your distributed architecture.

Leader Election and Distributed Locks: Implement coordination primitives for Apache Hadoop, Apache Solr, and custom distributed systems.

## cloudimg Support

24/7 technical support by email and live chat. Our engineers assist with:

• ZooKeeper deployment and ensemble configuration
• ACL design and security hardening
• Performance tuning and monitoring setup
• Multi-node ensemble expansion planning
• Integration with Kafka, Hadoop, Solr, and other distributed systems

Critical issues receive a one-hour average response time.

## Evaluation Path

Launch this AMI on a small instance to evaluate the full stack. ZooKeeper is operational on first boot - connect your application to port 2181 or browse to the instance address to explore the znode tree visually through ZooNavigator.

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