How would you deploy software to 5000 nodes?

Here is how I would approach deploying software to 5000 nodes as a DevOps engineer:

Preparation

• Ensure the software is thoroughly tested and packaged for easy deployment
• Provision enough infrastructure to handle the deployment, including load balancers, caching, and monitoring
• Automate as much of the process as possible using configuration management tools like Ansible, Puppet or Chef

Deployment Strategy

1. Canary Deployment

• Deploy the new software to a small subset of nodes first (e.g. 1-5%) to test in production
• Monitor for any issues or errors
• If successful, proceed to rolling deployment

2. Rolling Deployment

• Upgrade nodes in batches (e.g. 10-20% at a time)
• Use load balancers to route traffic away from nodes being upgraded
• Verify each batch is healthy before proceeding to the next

3. Blue-Green Deployment

• Have...