Zero-Downtime Docker Swarm Cluster

I need a production-ready Docker Swarm cluster deployed on multiple Contabo VPS nodes. Each service must run with at least two replicas so traffic can shift seamlessly during updates; downtime is not acceptable... (Budget: ₹12500 - ₹37500 INR, Jobs: Amazon Web Services, Ansible, CI/CD, Docker, Linux, Node.js, Terraform, Ubuntu)