Deploying Docker Swarm on Rocky Linux

Welcome to an exciting and practical journey into container orchestration!
In this guide, you will deploy a highly available Docker Swarm cluster across three Rocky Linux servers. Through a series of carefully structured steps, you will gain hands-on experience installing, configuring, and managing containerized services on Rocky Linux, sharpening your skills in modern IT infrastructure and cloud-native technologies. By the end of this exercise, you will be better equipped to manage and scale containerized applications confidently and efficiently.

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Testbed Configuration

Host	IP Address
SwarmManager	192.168.10.131
RNode1	192.168.10.135
RNode2	192.168.10.136

Step 1: Initial Configuration of SwarmManager Node

Begin by preparing the Swarm Manager node:

# Add Docker repository

# Verify repository list

# Update the system

# Install Docker Engine and related components

# Enable and start the Docker service

# Add user to Docker group for non-root access

# Configure Firewall for Swarm Communication

# Initialize Docker Swarm

Step 2: Adding Worker Nodes to the Swarm

Now, configure each worker node to join the cluster.

RNode1 Setup:

# Update and prepare the system

# Add Docker repository

# Install Docker Engine and related components

# Enable and start Docker

# Add user to Docker group

# Allow necessary firewall ports

# Join the Swarm cluster

Note: Replace <your-token> with the actual token generated during the Swarm initialization.

RNode2 Setup:

# Update and prepare the system

# Add Docker repository

# Install Docker Engine and related components

# Enable and start Docker

# Add user to Docker group

# Allow necessary firewall ports

# Join the Swarm cluster

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Step 3: Verifying Swarm Node Status

Confirm that all nodes have successfully joined the cluster:

# List all nodes in the Swarm

# Detailed Swarm information

You should observe three nodes: one Manager and two Workers.

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Step 4: Creating and Managing Services on Docker Swarm

Launch your first containerized service on the Swarm:

# Deploy a simple HTTP service

# Verify the service

# Test service availability

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Step 5: Scaling Services Dynamically

Experience the power of scaling services with a single command:

# Scale the service to 3 replicas

# Verify replica distribution

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Step 6: Testing Service Across Nodes

Validate service accessibility across different nodes:

# List running containers

# Test service on each node

You should receive consistent responses, demonstrating load distribution and service availability across your Swarm cluster!

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Conclusion

Congratulations! By completing this guide, you have successfully deployed and managed a multi-node Docker Swarm cluster on Rocky Linux. You now possess fundamental expertise in container orchestration, service scaling, and distributed system management, critical skills that are in high demand across the IT industry. Keep experimenting, keep building, and let this accomplishment fuel your journey into the vast world of cloud-native technologies!