How to trigger multiple pipelines using GitLab CI/CD

Continuous integration (CI) in software development involves automating the building and testing of code before it is merged into the main branch, reducing the risk of bugs. Moving beyond CI to continuous delivery and deployment (CD) involves deploying code and testing it in a live environment, ensuring compatibility with other components, especially in microservices architectures where different teams manage separate repositories. GitLab CI/CD facilitates this process with a configuration file, .gitlab-ci.yml, which defines pipelines and jobs, allowing developers to independently edit and manage their pipeline configurations. The platform supports triggering cross-project pipelines, enabling the integration and testing of interdependent microservices through a bridge job syntax introduced in GitLab 11.8. This mechanism allows for the specification of downstream project paths, branch names, and the passing of variables to downstream pipelines, enhancing flexibility and integration across projects. GitLab also provides pipeline graphs to visualize and navigate through complex pipeline structures, helping users understand the flow and status of both upstream and downstream processes.

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