Final answer:
Whether rolling deployments are better than blue-green deployments depends on the specific needs of the deployment. Rolling deployments are efficient and allow for continuous monitoring but lack the immediate fallback option of blue-green deployments, which provide a separate environment for testing the new release.
Step-by-step explanation:
Whether rolling deployments are better than blue-green deployments depends on the context of the application being deployed and the goals of the deployment strategy. Rolling deployments involve gradually updating instances with a new version, which causes zero downtime and is resource-efficient. However, if a problem arises, it does not offer an immediate fallback as blue-green deployments do. On the other hand, blue-green deployments provide a rapid way to rollback if necessary, as it maintains two identical environments: one content loaded with the production load (blue) and one idle with the new version (green).
One of the key benefits of rolling deployments is the ability to monitor the deployment as it happens, which can be critical for ensuring that the new version is performing as expected. In contrast, blue-green offers a more robust testing environment for the new release before it goes live. Depending on the project's needs, budget constraints, or risk tolerance, one method may be preferred over the other. It's also worth noting that many organizations might use a combination of both strategies to maximize the benefits of each.