Migrating an entire infrastructure across multiple Breeze instances demands careful coordination. A structured plan reduces downtime and prevents data loss during the transition.
Phase 1: Discovery and Inventory
- List all servers, their roles (web, database, cache, worker), and interdependencies
- Document IP addresses, DNS records, firewall rules, and SSL certificates
- Identify stateful services (databases, file storage) that need special handling
- Map application dependencies to determine migration order
Phase 2: Prepare the Destination
# Provision new Breeze instances matching or exceeding current specs
# Install and configure base software stack
sudo apt update && sudo apt upgrade -y
# Replicate firewall rules
sudo ufw status numbered # on source
# Apply matching rules on destinationPhase 3: Define Migration Order
Follow this general sequence to minimize downtime:
- Databases first -- set up replication before cutting over
- Shared storage -- sync file systems with rsync
- Application servers -- deploy code and test against new databases
- Load balancers and DNS -- switch traffic last
Phase 4: Execute with a Runbook
Create a step-by-step runbook with time estimates and rollback procedures:
# Example runbook entry
# Step 5: Switch database primary (estimated: 2 min)
# Action: Promote replica on new-db-server
# Rollback: Revert DNS to old-db-server within 60s
# Verify: Run health check query on applicationPost-Migration Checklist
- Verify all services are responding on the new infrastructure
- Monitor error rates and latency for 24-48 hours
- Keep old servers running in standby for quick rollback
- Update monitoring, alerting, and backup configurations for the new IPs
- Document the new infrastructure layout for future reference