What is multi-cloud CI/CD and what challenges does it introduce?

Multi-cloud CI/CD involves deploying the same application to multiple cloud providers (AWS, Azure, GCP) or managing infrastructure across multiple clouds from a single pipeline. Use cases include: avoiding vendor lock-in, regulatory requirements to operate in specific regions not served by one provider, and choosing best-of-breed services from different clouds. Challenges include: Authentication management — maintaining credentials for multiple cloud APIs securely; Artifact distribution — pushing Docker images to multiple registries (ECR, GCR, ACR); Configuration differences — each cloud has different naming conventions, IAM models, and service APIs; Testing complexity — validating deployments across multiple targets; and Increased pipeline complexity. Tools like Terraform with multiple provider configurations, GitHub Actions with cloud-specific action sets, and Pulumi help manage multi-cloud pipelines. Most organizations avoid true multi-cloud for application deployment unless there is a strong business requirement.