Anti-patterns for continuous delivery

Large batch deployments: Batching multiple changes into a single, large release can lead to increased risk and longer lead times. Deploying in smaller batches allows for faster feedback and quicker resolution of issues, ultimately leading to a more efficient and reliable delivery process.

Manual deployments: Deployments done manually lack consistency, increase the chances of human error, and hinder the pace of delivering software changes. This practice contradicts the fundamental premise of continuous delivery and continuous deployment which emphasizes on automation to ensure reliability and speed.

Building more than once: Not adhering to the build once, deploy many principle during deployments. When code is built multiple times, there's a chance that inconsistencies due to different environments having different configurations, component versions, or updates. This can lead to deployment errors, causing failures in production that weren't encountered in pre-production environments. To ensure consistency, build the artifact once, and always deploy artifacts directly from trusted artifact repositories.

Tightly coupled systems: Developing and deploying in a tightly coupled architectural environment can lead to numerous continuous delivery challenges. In tightly coupled systems, a change in one component often necessitates changes in others, leading to cascading updates and increased complexity in managing deployments. This makes isolation of changes for testing purposes difficult, leading to longer lead times and an increased likelihood of bugs being introduced. This also makes the system less resilient, as failures can easily propagate through the system. Instead, architect loosely coupled systems that use modular components or microservices. This allows for systems to be updated and deployed independently of each other, reducing complexity and risk.